From 01d17f241a5e0078106d9e6cf5d87a48caf37db1 Mon Sep 17 00:00:00 2001
From: David Bloomin <daveey@gmail.com>
Date: Fri, 4 Sep 2026 05:29:18 +0000
Subject: [PATCH 1/5] bc20: the Battlecode 2020 rule set as a Nim year module
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Adds `src/battlecode/years/bc20/` — world, flood, pollution, blockchain,
cows, maps, knobs, rules and the two chassis — plus the committed data the
sim reads: 18 converted `.map20` maps, the JDK-generated float32
water-level table, and the 2020 sprite atlas cut from the official client.

The year-neutral machinery (`match`, `results`, `replay`, `render`,
`broadcast`, `decide`, `server`, the wasm entry) now goes through
`years/dispatch.nim`, the one place a year is named; `sheet.nim` is thinned
to the envelope and each year's knob table moves to `years/<year>/knobs.nim`,
with the tolerant-parsing primitives extracted UNCHANGED into
`sheet_common.nim`. bc26 semantics are untouched: every existing test passes
in debug and release.
---
 data/atlas_bc20.json                          |   1 +
 data/atlas_bc20.png                           | Bin 0 -> 9915 bytes
 data/bc20/water_levels.json                   |   1 +
 data/maps/bc20/ALandDivided.json              |   1 +
 data/maps/bc20/BeachFrontProperty.json        |   1 +
 data/maps/bc20/CentralLake.json               |   1 +
 data/maps/bc20/CentralSoup.json               |   1 +
 data/maps/bc20/Climb.json                     |   1 +
 data/maps/bc20/Constriction.json              |   1 +
 data/maps/bc20/Hills.json                     |   1 +
 data/maps/bc20/Hourglass.json                 |   1 +
 data/maps/bc20/Infinity.json                  |   1 +
 data/maps/bc20/Maze.json                      |   1 +
 data/maps/bc20/OmgThisIsProcedural.json       |   1 +
 data/maps/bc20/Spiral.json                    |   1 +
 data/maps/bc20/Squares.json                   |   1 +
 data/maps/bc20/TheHighGround.json             |   1 +
 data/maps/bc20/Toothpaste.json                |   1 +
 data/maps/bc20/TwoLakeLand.json               |   1 +
 data/maps/bc20/WateredDown.json               |   1 +
 data/maps/bc20/maptestsmall.json              |   1 +
 replay-viewer/bc_replay.nim                   |  13 +-
 src/battlecode/baselines.nim                  |  94 +-
 src/battlecode/broadcast.nim                  | 190 ++++
 src/battlecode/decide.nim                     | 141 ++-
 src/battlecode/match.nim                      | 128 ++-
 src/battlecode/render.nim                     | 153 ++-
 src/battlecode/replay.nim                     |  46 +-
 src/battlecode/results.nim                    |  68 +-
 src/battlecode/server.nim                     |  24 +-
 src/battlecode/sheet.nim                      | 360 +------
 src/battlecode/sheet_common.nim               |  92 ++
 src/battlecode/years/bc20/blockchain.nim      |  62 ++
 src/battlecode/years/bc20/chassis/boc.nim     |  59 ++
 .../years/bc20/chassis/designschool.nim       |  29 +
 src/battlecode/years/bc20/chassis/drone.nim   | 210 ++++
 .../years/bc20/chassis/fulfillment.nim        |  22 +
 src/battlecode/years/bc20/chassis/hq.nim      |  91 ++
 src/battlecode/years/bc20/chassis/kit.nim     | 170 +++
 .../years/bc20/chassis/landscaper.nim         | 217 ++++
 src/battlecode/years/bc20/chassis/lattice.nim |  71 ++
 src/battlecode/years/bc20/chassis/miner.nim   | 195 ++++
 src/battlecode/years/bc20/chassis/netgun.nim  |  12 +
 src/battlecode/years/bc20/chassis/pathing.nim | 106 ++
 .../years/bc20/chassis/scaffold.nim           | 133 +++
 src/battlecode/years/bc20/chassis/signals.nim |  76 ++
 src/battlecode/years/bc20/constants.nim       | 123 +++
 src/battlecode/years/bc20/cows.nim            |  75 ++
 src/battlecode/years/bc20/flood.nim           | 103 ++
 src/battlecode/years/bc20/knobs.nim           | 178 ++++
 src/battlecode/years/bc20/maps.nim            | 155 +++
 src/battlecode/years/bc20/pollution.nim       |  35 +
 src/battlecode/years/bc20/rules.nim           | 231 ++++
 src/battlecode/years/bc20/world.nim           | 998 ++++++++++++++++++
 src/battlecode/years/bc26/chassis/kit.nim     |   4 +-
 src/battlecode/years/bc26/knobs.nim           | 248 +++++
 src/battlecode/years/bc26/rules.nim           |  10 +-
 src/battlecode/years/dispatch.nim             | 262 +++++
 src/battlecode/years/registry.nim             |   9 +-
 tests/test_determinism.nim                    |  24 +-
 tests/test_perf.nim                           |   2 +-
 tests/test_replay.nim                         |  24 +-
 tests/test_viewer.nim                         |  14 +-
 tools/JavaWaterLevels.java                    |  64 ++
 .../convert_maps_bc20.cpython-311.pyc         | Bin 0 -> 18695 bytes
 tools/build_sprite_atlas_bc20.py              | 106 ++
 tools/convert_maps_bc20.py                    | 298 ++++++
 tools/gen_year_constants.py                   | 159 ++-
 tools/map_pools_bc20.json                     |   9 +
 69 files changed, 5421 insertions(+), 492 deletions(-)
 create mode 100644 data/atlas_bc20.json
 create mode 100644 data/atlas_bc20.png
 create mode 100644 data/bc20/water_levels.json
 create mode 100644 data/maps/bc20/ALandDivided.json
 create mode 100644 data/maps/bc20/BeachFrontProperty.json
 create mode 100644 data/maps/bc20/CentralLake.json
 create mode 100644 data/maps/bc20/CentralSoup.json
 create mode 100644 data/maps/bc20/Climb.json
 create mode 100644 data/maps/bc20/Constriction.json
 create mode 100644 data/maps/bc20/Hills.json
 create mode 100644 data/maps/bc20/Hourglass.json
 create mode 100644 data/maps/bc20/Infinity.json
 create mode 100644 data/maps/bc20/Maze.json
 create mode 100644 data/maps/bc20/OmgThisIsProcedural.json
 create mode 100644 data/maps/bc20/Spiral.json
 create mode 100644 data/maps/bc20/Squares.json
 create mode 100644 data/maps/bc20/TheHighGround.json
 create mode 100644 data/maps/bc20/Toothpaste.json
 create mode 100644 data/maps/bc20/TwoLakeLand.json
 create mode 100644 data/maps/bc20/WateredDown.json
 create mode 100644 data/maps/bc20/maptestsmall.json
 create mode 100644 src/battlecode/sheet_common.nim
 create mode 100644 src/battlecode/years/bc20/blockchain.nim
 create mode 100644 src/battlecode/years/bc20/chassis/boc.nim
 create mode 100644 src/battlecode/years/bc20/chassis/designschool.nim
 create mode 100644 src/battlecode/years/bc20/chassis/drone.nim
 create mode 100644 src/battlecode/years/bc20/chassis/fulfillment.nim
 create mode 100644 src/battlecode/years/bc20/chassis/hq.nim
 create mode 100644 src/battlecode/years/bc20/chassis/kit.nim
 create mode 100644 src/battlecode/years/bc20/chassis/landscaper.nim
 create mode 100644 src/battlecode/years/bc20/chassis/lattice.nim
 create mode 100644 src/battlecode/years/bc20/chassis/miner.nim
 create mode 100644 src/battlecode/years/bc20/chassis/netgun.nim
 create mode 100644 src/battlecode/years/bc20/chassis/pathing.nim
 create mode 100644 src/battlecode/years/bc20/chassis/scaffold.nim
 create mode 100644 src/battlecode/years/bc20/chassis/signals.nim
 create mode 100644 src/battlecode/years/bc20/constants.nim
 create mode 100644 src/battlecode/years/bc20/cows.nim
 create mode 100644 src/battlecode/years/bc20/flood.nim
 create mode 100644 src/battlecode/years/bc20/knobs.nim
 create mode 100644 src/battlecode/years/bc20/maps.nim
 create mode 100644 src/battlecode/years/bc20/pollution.nim
 create mode 100644 src/battlecode/years/bc20/rules.nim
 create mode 100644 src/battlecode/years/bc20/world.nim
 create mode 100644 src/battlecode/years/bc26/knobs.nim
 create mode 100644 src/battlecode/years/dispatch.nim
 create mode 100644 tools/JavaWaterLevels.java
 create mode 100644 tools/__pycache__/convert_maps_bc20.cpython-311.pyc
 create mode 100644 tools/build_sprite_atlas_bc20.py
 create mode 100644 tools/convert_maps_bc20.py
 create mode 100644 tools/map_pools_bc20.json

diff --git a/data/atlas_bc20.json b/data/atlas_bc20.json
new file mode 100644
index 0000000..5b4fc86
--- /dev/null
+++ b/data/atlas_bc20.json
@@ -0,0 +1 @@
+{"sprites":{"cow":{"h":16,"w":16,"x":0,"y":0},"design_school_blue":{"h":16,"w":16,"x":16,"y":0},"design_school_red":{"h":16,"w":16,"x":32,"y":0},"drone_blue":{"h":16,"w":16,"x":48,"y":0},"drone_blue_carry":{"h":16,"w":16,"x":64,"y":0},"drone_red":{"h":16,"w":16,"x":80,"y":0},"drone_red_carry":{"h":16,"w":16,"x":96,"y":0},"fulfillment_center_blue":{"h":16,"w":16,"x":112,"y":0},"fulfillment_center_red":{"h":16,"w":16,"x":0,"y":16},"hq_blue":{"h":16,"w":16,"x":16,"y":16},"hq_red":{"h":16,"w":16,"x":32,"y":16},"landscaper_blue":{"h":16,"w":16,"x":48,"y":16},"landscaper_red":{"h":16,"w":16,"x":64,"y":16},"miner_blue":{"h":16,"w":16,"x":80,"y":16},"miner_red":{"h":16,"w":16,"x":96,"y":16},"net_gun_blue":{"h":16,"w":16,"x":112,"y":16},"net_gun_red":{"h":16,"w":16,"x":0,"y":32},"refinery_blue":{"h":16,"w":16,"x":16,"y":32},"refinery_red":{"h":16,"w":16,"x":32,"y":32},"soup":{"h":16,"w":16,"x":48,"y":32},"vaporator_blue":{"h":16,"w":16,"x":64,"y":32},"vaporator_red":{"h":16,"w":16,"x":80,"y":32}},"tile":16}
diff --git a/data/atlas_bc20.png b/data/atlas_bc20.png
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diff --git a/data/bc20/water_levels.json b/data/bc20/water_levels.json
new file mode 100644
index 0000000..eab0bb1
--- /dev/null
+++ b/data/bc20/water_levels.json
@@ -0,0 +1 @@
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--- /dev/null
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diff --git a/data/maps/bc20/BeachFrontProperty.json b/data/maps/bc20/BeachFrontProperty.json
new file mode 100644
index 0000000..89246c3
--- /dev/null
+++ b/data/maps/bc20/BeachFrontProperty.json
@@ -0,0 +1 @@
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diff --git a/data/maps/bc20/CentralLake.json b/data/maps/bc20/CentralLake.json
new file mode 100644
index 0000000..ee967fd
--- /dev/null
+++ b/data/maps/bc20/CentralLake.json
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diff --git a/data/maps/bc20/CentralSoup.json b/data/maps/bc20/CentralSoup.json
new file mode 100644
index 0000000..33fb240
--- /dev/null
+++ b/data/maps/bc20/CentralSoup.json
@@ -0,0 +1 @@
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diff --git a/data/maps/bc20/Climb.json b/data/maps/bc20/Climb.json
new file mode 100644
index 0000000..c9ce8fb
--- /dev/null
+++ b/data/maps/bc20/Climb.json
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diff --git a/data/maps/bc20/Constriction.json b/data/maps/bc20/Constriction.json
new file mode 100644
index 0000000..b3aa405
--- /dev/null
+++ b/data/maps/bc20/Constriction.json
@@ -0,0 +1 @@
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diff --git a/data/maps/bc20/Hills.json b/data/maps/bc20/Hills.json
new file mode 100644
index 0000000..bbfae35
--- /dev/null
+++ b/data/maps/bc20/Hills.json
@@ -0,0 +1 @@
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diff --git a/data/maps/bc20/Hourglass.json b/data/maps/bc20/Hourglass.json
new file mode 100644
index 0000000..c9c180c
--- /dev/null
+++ b/data/maps/bc20/Hourglass.json
@@ -0,0 +1 @@
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diff --git a/data/maps/bc20/Infinity.json b/data/maps/bc20/Infinity.json
new file mode 100644
index 0000000..a27e93b
--- /dev/null
+++ b/data/maps/bc20/Infinity.json
@@ -0,0 +1 @@
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diff --git a/data/maps/bc20/Maze.json b/data/maps/bc20/Maze.json
new file mode 100644
index 0000000..14520cd
--- /dev/null
+++ b/data/maps/bc20/Maze.json
@@ -0,0 +1 @@
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diff --git a/data/maps/bc20/OmgThisIsProcedural.json b/data/maps/bc20/OmgThisIsProcedural.json
new file mode 100644
index 0000000..5245fd1
--- /dev/null
+++ b/data/maps/bc20/OmgThisIsProcedural.json
@@ -0,0 +1 @@
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diff --git a/data/maps/bc20/Spiral.json b/data/maps/bc20/Spiral.json
new file mode 100644
index 0000000..70fc0be
--- /dev/null
+++ b/data/maps/bc20/Spiral.json
@@ -0,0 +1 @@
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diff --git a/data/maps/bc20/Squares.json b/data/maps/bc20/Squares.json
new file mode 100644
index 0000000..56b2a77
--- /dev/null
+++ b/data/maps/bc20/Squares.json
@@ -0,0 +1 @@
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diff --git a/data/maps/bc20/TheHighGround.json b/data/maps/bc20/TheHighGround.json
new file mode 100644
index 0000000..4352db3
--- /dev/null
+++ b/data/maps/bc20/TheHighGround.json
@@ -0,0 +1 @@
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diff --git a/data/maps/bc20/Toothpaste.json b/data/maps/bc20/Toothpaste.json
new file mode 100644
index 0000000..2810fdb
--- /dev/null
+++ b/data/maps/bc20/Toothpaste.json
@@ -0,0 +1 @@
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diff --git a/data/maps/bc20/TwoLakeLand.json b/data/maps/bc20/TwoLakeLand.json
new file mode 100644
index 0000000..af49193
--- /dev/null
+++ b/data/maps/bc20/TwoLakeLand.json
@@ -0,0 +1 @@
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diff --git a/data/maps/bc20/WateredDown.json b/data/maps/bc20/WateredDown.json
new file mode 100644
index 0000000..495a96f
--- /dev/null
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diff --git a/data/maps/bc20/maptestsmall.json b/data/maps/bc20/maptestsmall.json
new file mode 100644
index 0000000..c51d2c2
--- /dev/null
+++ b/data/maps/bc20/maptestsmall.json
@@ -0,0 +1 @@
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diff --git a/replay-viewer/bc_replay.nim b/replay-viewer/bc_replay.nim
index 3ddba36..7a46977 100644
--- a/replay-viewer/bc_replay.nim
+++ b/replay-viewer/bc_replay.nim
@@ -14,7 +14,7 @@
 import std/json
 import bitworld/spriteprotocol
 import battlecode/[broadcast, build_stamp, render, replay, sim_types]
-import battlecode/years/bc26/world
+import battlecode/years/dispatch
 
 var
   runtimeLoaded = false
@@ -67,9 +67,12 @@ proc renderCurrent() =
     else: 0
   let sideAslot = doc.plan.sideAslots[min(gameIndex, doc.plan.sideAslots.high)]
   let ended = deriver.frame >= deriver.totalFrames - 1
-  let chrome = chromeJson(doc, deriver.world, viewer, max(0, deriver.frame),
-    deriver.totalFrames, gameIndex, sideAslot, beats, gameChips, ended)
-  packet = renderer.buildPacket(deriver.world, gameIndex, sideAslot, chrome)
+  ## The replay header's `year` selects the sim, the atlas and the chrome
+  ## record set; nothing else in this file knows which year it is.
+  let chrome = sessionChromeJson(doc, deriver.session, viewer,
+    max(0, deriver.frame), deriver.totalFrames, gameIndex, sideAslot, beats,
+    gameChips, ended)
+  packet = renderer.buildSessionPacket(deriver.session, chrome)
 
 proc bcLoadReplay(data: ptr uint8, length: cint): cint
     {.exportc: "bc_load_replay", cdecl.} =
@@ -84,7 +87,7 @@ proc bcLoadReplay(data: ptr uint8, length: cint): cint
     stampStage("build the deriver")
     deriver = newDeriver(doc)
     stampStage("load the sprite atlas")
-    renderer = newRenderer()
+    renderer = newRenderer(yearSpec(doc.year).atlas)
     stampStage("collect the scrubber beats")
     viewer = initViewerState()
     beats = beatsFor(doc, frameOfGameRound)
diff --git a/src/battlecode/baselines.nim b/src/battlecode/baselines.nim
index 10bf96a..60a53ff 100644
--- a/src/battlecode/baselines.nim
+++ b/src/battlecode/baselines.nim
@@ -1,39 +1,77 @@
-## The two published scripted baselines.
+## The published scripted baselines, YEAR-AWARE.
 ##
-## Both answer the doctrine request from a TABLE — no model, no network — and
-## both replies go through the SAME `sheet.validate()` the LLM path uses,
-## which is what makes `tests/test_baselines.nim`'s bounded-orders check
-## meaningful and an LLM doctrine and a scripted one strictly comparable.
+## `PLAYER_SCRIPTED=<name>` selects BOTH the reply sheet and the chassis. The
+## chassis is never a sheet field (D1): a submitted `chassis` key is recorded
+## as an unknown field and never honoured, so the filler path below is the ONLY
+## way `scaffold` or `examplefuncsplayer` is ever driven.
+##
+## Every reply goes through the SAME `sheet.validate()` the LLM path uses,
+## which is what makes `tests/test_baselines.nim`'s and
+## `tests/test_bc20_baselines.nim`'s bounded-orders checks meaningful and an
+## LLM doctrine and a scripted one strictly comparable — which is why a reply
+## carries only keys the LLM surface also has, and never `chassis`.
 
 import std/strutils
 import sheet
+import years/dispatch
 
 type
   Baseline* = enum
     blAwu = "awu"
     blScaffold = "scaffold"
+    blBowlOfChowder = "bowl-of-chowder"
+    blExamplefuncsplayer = "examplefuncsplayer"
+
+proc defaultBaselineFor*(year: string): Baseline =
+  ## A seat that says nothing useful plays the year's STRONG published
+  ## doctrine, not the deliberately weak floor.
+  case yearIdOf(year)
+  of yBc20: blBowlOfChowder
+  of yBc26: blAwu
+
+proc baselineFor*(year, name: string): Baseline =
+  ## `PLAYER_SCRIPTED` values, per year. An unrecognised name takes the year's
+  ## default.
+  let key = name.strip().toLowerAscii()
+  case yearIdOf(year)
+  of yBc20:
+    case key
+    of "examplefuncsplayer", "scaffold", "example": blExamplefuncsplayer
+    else: blBowlOfChowder
+  of yBc26:
+    case key
+    of "scaffold", "examplefuncsplayer", "example": blScaffold
+    else: blAwu
 
 proc parseBaseline*(text: string): Baseline =
-  ## `PLAYER_SCRIPTED` values. Anything unrecognised is `awu`: a seat that
-  ## says nothing useful still plays the published default rather than the
-  ## deliberately weak floor.
-  case text.strip().toLowerAscii()
-  of "scaffold", "examplefuncsplayer", "example": blScaffold
-  else: blAwu
+  ## Year-free reading, kept for the bc26 call sites that predate the year
+  ## module boundary. bc26's own two names are the only ones it can return.
+  baselineFor("bc26", text)
 
 proc chassisFor*(kind: Baseline): Chassis =
-  ## The filler path's chassis selection, and the ONLY one there is. It is not
-  ## a sheet key: an LLM doctrine cannot reach it (see `sheet.KnownKeys`), so
-  ## `scaffold` is selectable only by `PLAYER_SCRIPTED=scaffold`.
+  ## The bc26 filler path's chassis selection, and the ONLY one there is. It
+  ## is not a sheet key: an LLM doctrine cannot reach it (see
+  ## `sheet.KnownKeys`), so `scaffold` is selectable only by
+  ## `PLAYER_SCRIPTED=scaffold`.
   case kind
-  of blAwu: chAwu
   of blScaffold: chScaffold
+  else: chAwu
+
+proc baselineChassis*(kind: Baseline): ChassisKind =
+  ## The same selection for bc20, whose chassis is a `ChassisKind` on the seat
+  ## record rather than a field on the doctrine.
+  case kind
+  of blExamplefuncsplayer: parseChassisKind("examplefuncsplayer")
+  else: parseChassisKind("bowl-of-chowder")
 
 proc baselineReply*(kind: Baseline): string =
   ## The exact JSON a scripted seat "answers" with. Emitted as text and then
   ## parsed by the same tolerant validator, so a scripted seat is
   ## indistinguishable from an LLM seat downstream — which is why it carries
   ## only keys the LLM surface also has, and never `chassis`.
+  ##
+  ## The bc20 replies are the all-defaults sheet: the passive-lattice build,
+  ## which is also the fallback sheet §Decisions prints verbatim.
   case kind
   of blAwu:
     """{"sheet":{},"notes":"default awu doctrine",
@@ -41,7 +79,29 @@ proc baselineReply*(kind: Baseline): string =
   of blScaffold:
     """{"sheet":{},"notes":"scaffold baseline",
         "motto":"Forward."}"""
+  of blBowlOfChowder:
+    """{"sheet":{"opening":"passive_lattice","terraform_start_round":300,
+                 "lattice_radius":6,"landscaper_count_curve":"steady",
+                 "miner_count_curve":"steady","vaporator_budget":2,
+                 "drone_role":"harass","net_gun_ring":2,"rush_trigger":0,
+                 "wall_hq_round":250},
+        "notes":"default bowl-of-chowder doctrine","motto":"Soup first."}"""
+  of blExamplefuncsplayer:
+    """{"sheet":{"opening":"passive_lattice","terraform_start_round":300,
+                 "lattice_radius":6,"landscaper_count_curve":"steady",
+                 "miner_count_curve":"steady","vaporator_budget":2,
+                 "drone_role":"harass","net_gun_ring":2,"rush_trigger":0,
+                 "wall_hq_round":250},
+        "notes":"scaffold baseline (2020)","motto":"Forward."}"""
+
+proc baselineSheet*(year: string, kind: Baseline): Sheet =
+  result = parseReply(baselineReply(kind), year)
+  ## bc26 carries its chassis ON the doctrine, so the filler path sets it here
+  ## rather than through the sheet. bc20 carries it on the seat record instead.
+  if yearIdOf(year) == yBc26:
+    result.doctrine.chassis = chassisFor(kind)
 
 proc baselineSheet*(kind: Baseline): Sheet =
-  result = parseReply(baselineReply(kind))
-  result.doctrine.chassis = chassisFor(kind)
+  baselineSheet("bc26", kind)
+
+proc baselineName*(kind: Baseline): string = $kind
diff --git a/src/battlecode/broadcast.nim b/src/battlecode/broadcast.nim
index 9655e97..0c4f57e 100644
--- a/src/battlecode/broadcast.nim
+++ b/src/battlecode/broadcast.nim
@@ -11,7 +11,11 @@
 
 import std/[json, strutils]
 import sim_types, sheet, match, replay
+import years/dispatch
 import years/bc26/[constants, rules, world]
+from years/bc20/world as w20 import nil
+from years/bc20/constants as c20 import nil
+from years/bc20/chassis/signals as sig20 import nil
 
 const
   PlaybackSpeeds* = [1, 2, 3, 4, 8, 16]
@@ -124,6 +128,14 @@ proc beatsFor*(doc: ReplayDoc, frameOfGameRound: proc (g, r: int): int): JsonNod
       of "game_start": "game"
       of "game_end": "end"
       of "game_abandoned": "end"
+      of "flood_stage": "flood"
+      of "first_build": "build"
+      of "wall_closed": "wall"
+      of "rush_launched": "rush"
+      of "drone_water_drop": "drop"
+      of "hq_buried": "bury"
+      of "hq_drowned": "drown"
+      of "doctrine_received", "doctrine_fallback": "doctrine"
       else: ""
     if kind.len == 0: continue
     var label = ""
@@ -145,6 +157,30 @@ proc beatsFor*(doc: ReplayDoc, frameOfGameRound: proc (g, r: int): int): JsonNod
         e.fields{"end_reason"}.getStr().replace("_", " ") & ")"
     of "game_abandoned":
       label = "Game " & $(e.game + 1) & " abandoned at the wall clock"
+    of "flood_stage":
+      label = "Water reaches elevation " & $e.fields{"level"}.getInt() &
+        " — game " & $(e.game + 1) & ", round " & $e.round
+    of "first_build":
+      label = e.fields{"alias"}.getStr() & " builds its first " &
+        e.fields{"unit"}.getStr().replace("_", " ") & " — game " &
+        $(e.game + 1) & ", round " & $e.round
+    of "wall_closed":
+      label = e.fields{"alias"}.getStr() & " closes its HQ wall at elevation " &
+        $e.fields{"min_ring_elevation"}.getInt() & " — game " &
+        $(e.game + 1) & ", round " & $e.round
+    of "rush_launched":
+      label = e.fields{"alias"}.getStr() & " launches the rush — game " &
+        $(e.game + 1) & ", round " & $e.round
+    of "drone_water_drop":
+      label = e.fields{"alias"}.getStr() & " drops a " &
+        e.fields{"victim_unit"}.getStr().replace("_", " ") & " in the water — game " &
+        $(e.game + 1) & ", round " & $e.round
+    of "hq_buried":
+      label = "HQ BURIED — " & e.fields{"alias"}.getStr() & ", game " &
+        $(e.game + 1) & ", round " & $e.round
+    of "hq_drowned":
+      label = "HQ DROWNED — " & e.fields{"alias"}.getStr() & ", game " &
+        $(e.game + 1) & ", round " & $e.round
     else: discard
     result.add(%*{
       "t": frameOfGameRound(e.game, max(1, e.round)),
@@ -170,6 +206,98 @@ proc doctrinesJson*(doc: ReplayDoc): JsonNode =
       "motto": doc.seats[slot].sheet.motto
     })
 
+proc bc20Flood(w: w20.World): JsonNode =
+  ## `#bc20-flood`: the water level to 2 dp, the flood ring gauge, and the
+  ## HQ-elevation-versus-water reading the panel flashes red on.
+  var hqElev = [-1, -1]
+  for t in 0 .. 1:
+    let id = w.hqId[t]
+    if id >= 0 and id in w.robotsById:
+      hqElev[t] = w20.getDirt(w, w.robotsById[id].loc)
+  %*{
+    "water": float(w.waterLevel),
+    "flooded": w.floodedCount,
+    "tiles": w.width * w.height,
+    "hq_elevation": hqElev,
+    "global_pollution": w.globalPollution
+  }
+
+proc bc20Soup(w: w20.World, sideAslot: int): JsonNode =
+  result = newJArray()
+  for slot in 0 .. 1:
+    let t = if slot == sideAslot: 0 else: 1
+    result.add(%*{
+      "pool": w.stats.soup[t],
+      "mined": w.stats.soupMined[t],
+      "refined": w.stats.soupRefined[t]
+    })
+
+proc bc20Units(w: w20.World, sideAslot: int): JsonNode =
+  ## Per clan, counts by type plus the HQ's dirt load as `dirt/50`.
+  result = newJArray()
+  for slot in 0 .. 1:
+    let t = if slot == sideAslot: 0 else: 1
+    var hqDirt = 0
+    let id = w.hqId[t]
+    if id >= 0 and id in w.robotsById:
+      hqDirt = w.robotsById[id].dirtCarrying
+    result.add(%*{
+      "miner": w.typeCount[t][c20.rtMiner],
+      "landscaper": w.typeCount[t][c20.rtLandscaper],
+      "drone": w.typeCount[t][c20.rtDeliveryDrone],
+      "vaporator": w.typeCount[t][c20.rtVaporator],
+      "net_gun": w.typeCount[t][c20.rtNetGun],
+      "design_school": w.typeCount[t][c20.rtDesignSchool],
+      "fulfillment_center": w.typeCount[t][c20.rtFulfillmentCenter],
+      "refinery": w.typeCount[t][c20.rtRefinery],
+      "hq_dirt": hqDirt,
+      "hq_dirt_limit": c20.RobotSpecs[c20.rtHq].dirtLimit,
+      "dirt_moved": w.stats.dirtMoved[t],
+      "drone_drops": w.stats.droneWaterDrops[t],
+      "net_gun_kills": w.stats.netGunKills[t]
+    })
+
+proc bc20Chain(w: w20.World, sideAslot: int): JsonNode =
+  ## `#bc20-chain`, the endcard's blockchain panel. NOTHING about the chain is
+  ## stored in the replay: the wasm sim re-derives every block, and this reads
+  ## the re-derived blocks. Messages whose first int is not `SIGNAL_KEY` are
+  ## shown as raw ints, which is what makes an opponent's private traffic look
+  ## private without hiding that it happened.
+  var minted = [0, 0]
+  var spent = [0, 0]
+  var topFee = [0, 0]
+  var topRound = [-1, -1]
+  var recent = newJArray()
+  for roundIndex, blk in w.blockchain:
+    for tx in blk:
+      let slot = if tx.team == 0: sideAslot else: 1 - sideAslot
+      minted[slot] += 1
+      spent[slot] += tx.cost
+      if tx.cost > topFee[slot]:
+        topFee[slot] = tx.cost
+        topRound[slot] = roundIndex + 1
+      var words = ""
+      if tx.message[0] == sig20.SignalKey:
+        words = sig20.signalName(tx.message[2])
+      else:
+        for i, v in tx.message:
+          if i > 0: words.add("_")
+          words.add($v)
+      recent.add(%*{"alias": aliasFor(slot), "round": roundIndex + 1,
+                    "fee": tx.cost, "words": words})
+  ## The LAST FIVE minted messages, decoded to plain words.
+  var tail = newJArray()
+  let start = max(0, recent.len - 5)
+  for i in start ..< recent.len:
+    tail.add(recent[i])
+  %*{
+    "minted": minted, "soup_spent": spent,
+    "top_fee": topFee, "top_fee_round": topRound,
+    "recent": tail
+  }
+
+proc doctrineWords(doc: ReplayDoc): JsonNode = doctrinesJson(doc)
+
 proc chromeJson*(
   doc: ReplayDoc, w: World, view: ViewerState,
   frame, totalFrames, gameIndex, sideAslot: int,
@@ -215,3 +343,65 @@ proc chromeJson*(
     "result": doc.result
   }
   $node
+
+proc bc20ChromeJson*(
+  doc: ReplayDoc, w: w20.World, view: ViewerState,
+  frame, totalFrames, gameIndex, sideAslot: int,
+  beats: JsonNode, gameChips: JsonNode, ended: bool
+): string =
+  ## One frame of bc20 chrome. `t` / `st` / `mx` / `mt` are the GENERIC
+  ## timeline keys `chrome_common.js` reads, unchanged, so the clock, the
+  ## transport and the scrubber are driven by the starter's own code; the
+  ## `bc20_*` keys are what the APPENDED bc20 game block draws.
+  let phase = if ended: "gameover" else: "playing"
+  let points = w20.gamePoints(w)
+  var node = %*{
+    "t": frame,
+    "st": 0,
+    "mx": max(1, totalFrames - 1),
+    "mt": 0,
+    "sp": view.speed,
+    "pl": view.playing,
+    "lp": view.loop,
+    "sk": view.skipLulls,
+    "ff": false,
+    "en": true,
+    "ph": phase,
+    "lob": 0,
+    "pov": -1,
+    "nim": GameVersion,
+    "year": "bc20",
+    "beats": beats,
+    "game": gameIndex + 1,
+    "games": doc.games.len,
+    "map": doc.plan.maps[min(gameIndex, doc.plan.maps.high)],
+    "round": w.currentRound,
+    "rounds": doc.plan.maxRounds,
+    "aliases": [AliasA, AliasB],
+    "names": [doc.names[0], doc.names[1]],
+    "sides": [(if sideAslot == 0: "A" else: "B"),
+              (if sideAslot == 0: "B" else: "A")],
+    "points": [points[(if sideAslot == 0: 0 else: 1)],
+               points[(if sideAslot == 0: 1 else: 0)]],
+    "bc20_flood": bc20Flood(w),
+    "bc20_soup": bc20Soup(w, sideAslot),
+    "bc20_units": bc20Units(w, sideAslot),
+    "bc20_chain": bc20Chain(w, sideAslot),
+    "gamechips": gameChips,
+    "doctrines": doctrineWords(doc),
+    "result": doc.result
+  }
+  $node
+
+proc sessionChromeJson*(
+  doc: ReplayDoc, s: Session, view: ViewerState,
+  frame, totalFrames, gameIndex, sideAslot: int,
+  beats: JsonNode, gameChips: JsonNode, ended: bool
+): string =
+  case s.year
+  of yBc26:
+    chromeJson(doc, s.w26, view, frame, totalFrames, gameIndex, sideAslot,
+      beats, gameChips, ended)
+  of yBc20:
+    bc20ChromeJson(doc, s.w20, view, frame, totalFrames, gameIndex, sideAslot,
+      beats, gameChips, ended)
diff --git a/src/battlecode/decide.nim b/src/battlecode/decide.nim
index fa639e1..72f4d17 100644
--- a/src/battlecode/decide.nim
+++ b/src/battlecode/decide.nim
@@ -14,7 +14,7 @@
 import std/[json, monotimes, strutils, times]
 import curly
 import sim_types, sheet, baselines, llm, match
-import years/bc26/maps
+import years/dispatch
 
 type
   SeatPolicy* = object
@@ -22,6 +22,10 @@ type
     ## — or never registers at all — is `awu`.
     isLlm*: bool
     prompt*: string
+    scripted*: string
+      ## The raw `PLAYER_SCRIPTED` value. Resolved to a `Baseline` PER YEAR at
+      ## episode time, because `bowl-of-chowder` means nothing to bc26 and
+      ## `awu` means nothing to bc20.
     baseline*: Baseline
     label*: string
     registered*: bool
@@ -40,6 +44,24 @@ type
     policyKind*: array[2, string]
     events*: seq[MatchEvent]
 
+proc baselineForSeat*(year: string, seat: SeatPolicy): Baseline =
+  if seat.scripted.len > 0: baselineFor(year, seat.scripted)
+  else: defaultBaselineFor(year)
+
+proc chassisForSeat*(year: string, seat: SeatPolicy): ChassisKind =
+  ## D1: the chassis is fixed by the OPERATOR. A scripted seat drives the
+  ## chassis its `PLAYER_SCRIPTED` names; an LLM seat drives the fixed champion
+  ## chassis, which for bc20 is `bowl-of-chowder`.
+  if seat.isLlm: parseChassisKind("bowl-of-chowder")
+  else: baselineChassis(baselineForSeat(year, seat))
+
+proc chassisNameFor*(year: string, seat: SeatPolicy, sheet: Sheet): string =
+  case yearIdOf(year)
+  of yBc20:
+    (if seat.isLlm: "bowl-of-chowder"
+     else: baselineName(baselineForSeat(year, seat)))
+  of yBc26: $sheet.doctrine.chassis
+
 const SystemPreamble* = """
 You command a clan of robot rats in Battlecode 2026, "Uneasy Alliances": a
 two-clan grid war on a symmetric map, 2000 rounds a game, best of three.
@@ -97,27 +119,83 @@ Your clan is driven by the `awu` chassis. That is not yours to choose: there
 is no `chassis` knob, and a reply that sends one has it ignored.
 """
 
+const Bc20Preamble* = """
+You command a clan in Battlecode 2020 "Soup": a two-clan grid war on a
+symmetric map where THE WATER RISES EVERY ROUND, 1500 rounds a game, best of
+three.
+
+You do not move a single robot. Before the war you write ONE DOCTRINE — a JSON
+sheet of ten named knobs — and a deterministic simulation then plays the whole
+match from it while you watch.
+
+THE CLOCK IS THE WATER
+- The water level rises on a fixed curve and floods outward ONE RING PER ROUND
+  from every already-flooded tile whose neighbour sits below the level.
+  Anything that is not a delivery drone dies on a flooding tile.
+- Your HQ starts at a low elevation and CANNOT BE RAISED: dirt dropped on a
+  building buries it. The only thing that keeps an HQ dry is a ring of eight
+  adjacent tiles the water can never cross. An HQ that is never walled drowns
+  on a schedule.
+
+THE WORLD
+- MINERS (70 soup) mine SOUP (7 per action, carry 100) and deposit it at the HQ
+  or a REFINERY (200), which refines up to 20 per round into the team pool.
+- DESIGN SCHOOLS (150) build LANDSCAPERS (150), which dig and dump dirt: raise
+  the ground into a lattice, wall the HQ in, or bury the enemy HQ under FIFTY
+  dirt. A landscaper carries 25.
+- FULFILLMENT CENTERS (150) build DELIVERY DRONES (150), which pick up any unit
+  within r^2 <= 3 — including enemy landscapers — and drop them in the water.
+- VAPORATORS (500) print 2 soup a round and scrub pollution. NET GUNS (250)
+  shoot drones within r^2 <= 15; so does the HQ.
+- Pollution slows every action and shrinks every sensor. Cows pollute heavily.
+- The only global channel is a blockchain: seven ints a message, seven messages
+  a round, paid for in soup, and BOTH TEAMS READ EVERY BLOCK.
+
+HOW A GAME ENDS
+Round 1499, or when an HQ is buried or drowned. The ladder, first hit wins:
+HQ destroyed; more robots alive (buildings included); greater net worth; more
+transactions minted; highest living robot id; coin flip.
+  points = int(60 * HQ-survival share + 25 * unit share + 15 * net-worth share)
+Winning a game is worth 100 and points are worth at most 100, so the game bonus
+dominates: lose your HQ, lose the game.
+
+YOUR REPLY
+Reply with ONE JSON object and NOTHING else. Your reply must begin with '{'.
+{"sheet": {...knobs...}, "notes": "<=280 chars", "motto": "<=48 chars"}
+
+THE KNOBS (unknown key, wrong type or out-of-range value = that field's
+default; you cannot forfeit by answering badly, only by answering weakly):
+  opening                 "rush" | "lattice" | "passive_lattice" | "turtle"
+                                                          default "passive_lattice"
+  terraform_start_round   1..1500                          default 300
+  lattice_radius          2..12                            default 6
+  landscaper_count_curve  "lean" | "steady" | "swarm"      default "steady"
+  miner_count_curve       "lean" | "steady" | "swarm"      default "steady"
+  vaporator_budget        0..6                             default 2
+  drone_role              "harass" | "wall" | "buster" | "carry_landscapers"
+                                                          default "harass"
+  net_gun_ring            0..6                             default 2
+  rush_trigger            0..1500 (0 = never)              default 0
+  wall_hq_round           0..1500 (0 = never)              default 250
+"""
+
+proc preambleFor*(year: string): string =
+  case yearIdOf(year)
+  of yBc20: Bc20Preamble
+  of yBc26: SystemPreamble
+
 proc briefFor*(
   config: GameConfig, plan: MatchPlan, slot: int
 ): string =
   ## Everything this seat may legitimately know: its own alias and side, all
-  ## the map cards, the seed, both weight sets, the deadlines. NOT in here,
+  ## the map cards, the seed, the scoring weights, the deadlines. NOT in here,
   ## ever: the opponent's doctrine, sheet, notes, motto, real player name or
   ## fallback status. Sealed and simultaneous.
   var games = newJArray()
   for g in 0 ..< plan.maps.len:
-    let spec = loadMap(plan.maps[g])
-    games.add(%*{
-      "map": spec.name,
-      "width": spec.width,
-      "height": spec.height,
-      "symmetry": ($spec.symmetry).replace("sym", "").toLowerAscii(),
-      "cheese_mines": spec.cheeseMines.len,
-      "cats": spec.catWaypointIds.len,
-      "rounds": plan.maxRounds,
-      "you_are": (if plan.sideAslots[g] == slot: "A" else: "B")
-    })
-  $(%*{
+    games.add(mapCardFor(plan.year, plan.maps[g], slot, plan.sideAslots[g],
+      plan.maxRounds))
+  var payload = %*{
     "protocol": ProtocolId,
     "game_version": GameVersion,
     "year": plan.year,
@@ -127,19 +205,30 @@ proc briefFor*(
     "team": (if plan.sideAslots[0] == slot: "A" else: "B"),
     "seed": plan.seed,
     "games": games,
-    "scoring": {
+    "budget": {
+      "attempt1_ms": config.attempt1Ms,
+      "retry_ms": config.retryMs,
+      "one_shot": true
+    }
+  }
+  case yearIdOf(plan.year)
+  of yBc20:
+    payload["flood_table"] = floodTableJson()
+    payload["scoring"] = %*{
+      "weights": {"hq_survival": 60, "unit_share": 25, "net_worth_share": 15},
+      "win_bonus_per_game": 100,
+      "games": plan.maps.len,
+      "note": "shares are float32; points truncate to an integer"
+    }
+  of yBc26:
+    payload["scoring"] = %*{
       "cooperation": {"cat_damage": 0.5, "kings": 0.3, "cheese": 0.2},
       "backstab": {"cat_damage": 0.3, "kings": 0.5, "cheese": 0.2},
       "win_bonus_per_game": 100,
       "games": plan.maps.len,
       "note": "shares are float32; points truncate to an integer"
-    },
-    "budget": {
-      "attempt1_ms": config.attempt1Ms,
-      "retry_ms": config.retryMs,
-      "one_shot": true
     }
-  })
+  $payload
 
 proc decide*(
   config: GameConfig, plan: MatchPlan, seats: array[2, SeatPolicy]
@@ -152,7 +241,8 @@ proc decide*(
 
   var open: seq[int]
   for slot in 0 .. 1:
-    result.sheets[slot] = baselineSheet(seats[slot].baseline)
+    result.sheets[slot] = baselineSheet(config.year,
+      baselineForSeat(config.year, seats[slot]))
     result.policyKind[slot] = if seats[slot].isLlm: "llm" else: "scripted"
     if seats[slot].isLlm and not client.disabled:
       open.add(slot)
@@ -199,7 +289,7 @@ proc decide*(
         user.add("\n\nYour previous reply was not usable. Reply with ONLY " &
           "the JSON object described above, starting with '{'.")
       let request = client.requestFor(
-        SystemPreamble, userMessage(seats[slot].prompt, user))
+        preambleFor(config.year), userMessage(seats[slot].prompt, user))
       batch.post(request.url, request.headers, request.body, $slot)
     let batchStart = getMonoTime()
     ## ONE parallel batch. curly hands the deadline to CURLOPT_TIMEOUT, whose
@@ -213,7 +303,7 @@ proc decide*(
       try:
         let text = client.textOf(responses[position].response,
           responses[position].error, batch[position].url)
-        result.sheets[slot] = parseReply(text)
+        result.sheets[slot] = parseReply(text, config.year)
         result.decisionMs[slot] = latency
         result.fallback[slot] = ""
         ## `chassis` is not a knob (sheet.KnownKeys). A reply that still sends
@@ -251,7 +341,8 @@ proc decide*(
       break
 
   for slot in open:
-    result.sheets[slot] = baselineSheet(seats[slot].baseline)
+    result.sheets[slot] = baselineSheet(config.year,
+      baselineForSeat(config.year, seats[slot]))
     let cause =
       if client.disabled or client.transport == ltNone: "no_credentials"
       elif client.throttled: "throttled"
diff --git a/src/battlecode/match.nim b/src/battlecode/match.nim
index ab041f3..70a72fe 100644
--- a/src/battlecode/match.nim
+++ b/src/battlecode/match.nim
@@ -1,16 +1,21 @@
 ## The match: three games, alternating sides, one sealed doctrine per seat.
 ##
+## YEAR-NEUTRAL. The games are played through `years/dispatch.nim`, which is
+## the only module that names a year's world; the beats collected below are
+## mapped from the year's own event stream by kind, so a new year adds event
+## kinds and nothing here changes shape.
+##
 ## Everything wall-clock-driven is recorded as ONE load-bearing record and
 ## applied by the SAME proc on record and on playback (`abandonAfter`), which
 ## is the particle-worlds 2026-08-26 scar: a `deadline` stop derived from the
 ## recorder's clock and re-derived from the viewer's clock is not the same
 ## match.
 
-import std/[json, monotimes, strutils, times]
+import std/[json, monotimes, times]
 import sim_types, sheet
-import years/bc26/[constants, maps, rules, world]
+import years/dispatch
 
-export rules, maps
+export dispatch
 
 type
   MatchEvent* = object
@@ -29,6 +34,9 @@ type
     maps*: seq[string]
     sideAslots*: seq[int]
     sheets*: array[2, Sheet]
+    chassis*: array[2, ChassisKind]
+      ## Which chassis each SEAT drives. Never a sheet field (D1): it comes
+      ## from `PLAYER_SCRIPTED`, or is the fixed champion chassis.
     maxRounds*: int
     ## The wall-clock stop, RECORDED: round `abandonAfter[g]` is the last
     ## round game `g` played. -1 means the game ran to its own end.
@@ -61,38 +69,89 @@ proc buildPlan*(config: GameConfig, sheets: array[2, Sheet],
   result.year = config.year
   result.maxRounds = config.maxRounds
   result.sheets = sheets
+  result.chassis = [ckBowlOfChowder, ckBowlOfChowder]
   let count = max(1, config.gamesPerMatch)
-  result.maps = drawMaps(config.pool, seed, count)
+  result.maps = drawMapsFor(config.year, config.pool, seed, count)
   for g in 0 ..< result.maps.len:
-    result.sideAslots.add(sideAslotFor(seed, g))
+    result.sideAslots.add(sideAslotFor(config.year, seed, g))
     result.abandonAfter.add(-1)
 
 proc winsNeeded*(games: int): int = games div 2 + 1
 
-proc collectGameEvents(w: World, gameIndex: int, plan: MatchPlan,
-                       events: var seq[MatchEvent]) =
-  ## The engine's own event stream, filtered to the beats the chrome draws.
+proc aliasOfTeam(plan: MatchPlan, gameIndex, teamOrdinal: int): string =
+  ## `teamOrdinal` is 0 for A and 1 for B; which SEAT that is alternates per
+  ## game.
+  let slot = if teamOrdinal == 0: plan.sideAslots[gameIndex]
+             else: 1 - plan.sideAslots[gameIndex]
+  aliasFor(slot)
+
+proc collectGameEvents(
+  raw: seq[tuple[round: int, kind: string, a, b, c: int, s: string]],
+  gameIndex: int, plan: MatchPlan, events: var seq[MatchEvent]
+) =
+  ## The year's own event stream, filtered to the beats the chrome draws.
   ## Everything else stays in the sim; the replay re-derives it.
-  for e in w.events:
+  var firstBuildSeen: seq[string]
+  for e in raw:
     case e.kind
     of "backstab":
-      let slot = if Team(e.a) == teamA: plan.sideAslots[gameIndex]
-                 else: 1 - plan.sideAslots[gameIndex]
       events.add(ev("backstab", game = gameIndex, round = e.round,
-        fields = %*{"by_alias": aliasFor(slot), "by_slot": slot,
+        fields = %*{"by_alias": plan.aliasOfTeam(gameIndex, e.a),
+                    "by_slot": (if e.a == 0: plan.sideAslots[gameIndex]
+                                else: 1 - plan.sideAslots[gameIndex]),
                     "trigger": e.s}))
     of "king_built":
-      let slot = if Team(e.b) == teamA: plan.sideAslots[gameIndex]
-                 else: 1 - plan.sideAslots[gameIndex]
       events.add(ev("king_built", game = gameIndex, round = e.round,
-        fields = %*{"alias": aliasFor(slot), "kings_now": e.c}))
+        fields = %*{"alias": plan.aliasOfTeam(gameIndex, e.b),
+                    "kings_now": e.c}))
     of "cat_fed":
-      let slot = if Team(e.c) == teamA: plan.sideAslots[gameIndex]
-                 else: 1 - plan.sideAslots[gameIndex]
       events.add(ev("cat_fed", game = gameIndex, round = e.round,
-        fields = %*{"alias": aliasFor(slot)}))
+        fields = %*{"alias": plan.aliasOfTeam(gameIndex, e.c)}))
+    of "flood_stage":
+      events.add(ev("flood_stage", game = gameIndex, round = e.c,
+        fields = %*{"level": e.a, "flooded_tiles": e.b}))
+    of "first_build":
+      let key = $e.a & ":" & $e.b
+      if key in firstBuildSeen: continue
+      firstBuildSeen.add(key)
+      events.add(ev("first_build", game = gameIndex, round = e.c,
+        fields = %*{"alias": plan.aliasOfTeam(gameIndex, e.a),
+                    "unit": Bc20UnitNames[e.b]}))
+    of "wall_closed":
+      events.add(ev("wall_closed", game = gameIndex, round = e.c,
+        fields = %*{"alias": plan.aliasOfTeam(gameIndex, e.a),
+                    "min_ring_elevation": e.b}))
+    of "rush_launched":
+      events.add(ev("rush_launched", game = gameIndex, round = e.c,
+        fields = %*{"alias": plan.aliasOfTeam(gameIndex, e.a),
+                    "units": e.b}))
+    of "drone_water_drop":
+      events.add(ev("drone_water_drop", game = gameIndex, round = e.round,
+        fields = %*{"alias": plan.aliasOfTeam(gameIndex, e.b),
+                    "victim_alias": plan.aliasOfTeam(gameIndex, 1 - e.b),
+                    "victim_unit": Bc20UnitNames[e.c]}))
     else: discard
 
+proc bc20HqEvents(outcome: GameOutcome, gameIndex: int,
+                  events: var seq[MatchEvent]) =
+  ## `hq_buried` / `hq_drowned` are CHAPTER MARKERS, derived from the recorded
+  ## per-game statistics rather than from a sim event, so the same two facts
+  ## drive the endcard, the scrubber and `results.games[]`.
+  if outcome.stats.isNil: return
+  if not outcome.stats.hasKey("hq_lost_round"): return
+  for slot in 0 .. 1:
+    let round = outcome.stats["hq_lost_round"][slot].getInt(-1)
+    if round < 0: continue
+    let cause = outcome.stats["hq_lost_cause"][slot].getStr("none")
+    if cause == "buried":
+      events.add(ev("hq_buried", game = gameIndex, round = round,
+        fields = %*{"alias": aliasFor(slot), "by_alias": aliasFor(1 - slot),
+                    "dirt": 50}))
+    elif cause == "drowned":
+      events.add(ev("hq_drowned", game = gameIndex, round = round,
+        fields = %*{"alias": aliasFor(slot),
+                    "water_level": outcome.stats{"water_level_end"}.getFloat()}))
+
 proc playMatch*(config: GameConfig, plan: var MatchPlan,
                 events: var seq[MatchEvent]): (seq[GameOutcome], EpisodeReason) =
   ## Plays the planned games in order, stopping early once a seat has taken
@@ -113,15 +172,16 @@ proc playMatch*(config: GameConfig, plan: var MatchPlan,
       break
     let remaining = (matchBudget - elapsed).inSeconds.int
     let perGame = max(1, min(config.perGameBudgetSeconds, remaining))
-    let spec = loadMap(plan.maps[g])
+    let card = mapCardFor(config.year, plan.maps[g], plan.sideAslots[g],
+      plan.sideAslots[g], plan.maxRounds)
     events.add(ev("game_start", game = g, round = 0, fields = %*{
       "map": plan.maps[g],
-      "width": spec.width, "height": spec.height,
+      "width": card{"width"}.getInt(), "height": card{"height"}.getInt(),
       "sides": [aliasFor(plan.sideAslots[g]), aliasFor(1 - plan.sideAslots[g])]
     }))
-    let (w, outcome) = playGame(spec, plan.sheets, g, plan.sideAslots[g],
-      plan.maxRounds, perGame)
-    collectGameEvents(w, g, plan, events)
+    let (outcome, raw) = playGameFor(config.year, plan.maps[g], plan.sheets,
+      plan.chassis, g, plan.sideAslots[g], plan.maxRounds, perGame)
+    collectGameEvents(raw, g, plan, events)
     if outcome.aborted:
       ## The unfinished game is DISCARDED, and the round it stopped at is
       ## recorded so the viewer's re-derivation stops in the same place.
@@ -130,24 +190,28 @@ proc playMatch*(config: GameConfig, plan: var MatchPlan,
       events.add(ev("game_abandoned", game = g, round = outcome.roundsPlayed,
         fields = %*{"map": plan.maps[g]}))
       break
+    bc20HqEvents(outcome, g, events)
     outcomes.add(outcome)
     if outcome.winnerSlot >= 0:
       wins[outcome.winnerSlot] += 1
+    var endFields = %*{
+      "winner_alias": (if outcome.winnerSlot >= 0:
+                         aliasFor(outcome.winnerSlot) else: "nobody"),
+      "winner_slot": outcome.winnerSlot,
+      "end_reason": outcome.endReason,
+      "points": [outcome.points[0], outcome.points[1]]
+    }
+    if outcome.stats != nil and outcome.stats.hasKey("cooperation_at_end"):
+      endFields["cooperation_at_end"] = outcome.stats["cooperation_at_end"]
     events.add(ev("game_end", game = g, round = outcome.roundsPlayed,
-      fields = %*{
-        "winner_alias": (if outcome.winnerSlot >= 0:
-                           aliasFor(outcome.winnerSlot) else: "nobody"),
-        "winner_slot": outcome.winnerSlot,
-        "end_reason": $outcome.endReason,
-        "points": [outcome.points[0], outcome.points[1]],
-        "cooperation_at_end": outcome.cooperationAtEnd
-      }))
+      fields = endFields))
   (outcomes, reason)
 
 proc scoresFor*(games: seq[GameOutcome]): array[2, float] =
   ## `100 * gamesWon + mean(gamePoints over games actually played)`.
   ## Higher is better; the 100-per-game win bonus dominates, which is what
-  ## makes "losing every rat king loses the game outright" true.
+  ## makes "lose your HQ, lose the game" true in the ranking as well as in the
+  ## rules.
   if games.len == 0:
     return [0.0, 0.0]
   var wins: array[2, int]
diff --git a/src/battlecode/render.nim b/src/battlecode/render.nim
index ef4f92b..478db54 100644
--- a/src/battlecode/render.nim
+++ b/src/battlecode/render.nim
@@ -12,11 +12,15 @@
 ## round. Re-sending the board every round would be a megabyte a frame; the
 ## diff is a few dozen bytes.
 
-import std/[json, os, sequtils, sets, tables]
+import std/[json, math, os, sequtils, sets, tables]
 import pixie
 import bitworld/spriteprotocol
 import sheet
+import years/dispatch
 import years/bc26/[constants, maps, world]
+from years/bc20/world as w20 import nil
+from years/bc20/flood as f20 import nil
+from years/bc20/constants as c20 import nil
 
 const
   TileSize* = 16
@@ -35,11 +39,24 @@ const
   TrapAObjectBase = 24000
   TrapBObjectBase = 32000
   RobotObjectBase = 40000
+  SoupObjectBase = 48000
 
   FloorColor = rgba(38, 32, 28, 255)
   WallColor = rgba(88, 74, 60, 255)
   GridColor = rgba(46, 39, 34, 255)
 
+  ## bc20's board is a HEIGHTMAP under a rising sea, so the terrain sprite is
+  ## re-cut whenever the water crosses an integer level and the nine-step
+  ## elevation ramp is keyed to the CURRENT water line — the lattice then reads
+  ## as terrain rising out of the sea rather than as a static heightmap.
+  Bc20Ramp = [
+    rgba(24, 30, 38, 255), rgba(34, 42, 46, 255), rgba(48, 56, 50, 255),
+    rgba(64, 70, 54, 255), rgba(84, 84, 58, 255), rgba(106, 98, 64, 255),
+    rgba(130, 114, 78, 255), rgba(158, 136, 98, 255), rgba(190, 166, 126, 255)
+  ]
+  Bc20WaterColor = rgba(28, 62, 104, 255)
+  Bc20DeepWaterColor = rgba(16, 38, 70, 255)
+
 type
   Atlas = ref object
     image: Image
@@ -54,31 +71,39 @@ type
     prevDirt: seq[bool]
     prevCheese: seq[bool]
     prevTrap: array[2, seq[int]]
+    prevSoup: seq[int]
+    prevRobotSprite: Table[int, int]
     terrainGame: int
+    terrainStage: int
+    atlasName: string
 
-proc loadAtlas(): Atlas =
+proc loadAtlas(name: string): Atlas =
   ## The atlas rides in the wasm bundle's preloaded `data/`. When that package
   ## has not mounted, say so plainly: the alternative is whatever error the
   ## image decoder happens to raise on a missing file, several frames from
   ## the real cause.
   let root = dataRoot()
-  for asset in ["atlas.png", "atlas.json"]:
+  for asset in [name & ".png", name & ".json"]:
     if not fileExists(root / asset):
       raise newException(IOError,
         "the sprite atlas is missing: no " & (root / asset) &
         " (in the wasm bundle this means the preloaded data package did " &
         "not mount)")
-  result = Atlas(image: readImage(root / "atlas.png"),
+  result = Atlas(image: readImage(root / (name & ".png")),
                  cells: initTable[string, tuple[x, y, w, h: int]]())
-  let doc = parseJson(readFile(root / "atlas.json"))
+  let doc = parseJson(readFile(root / (name & ".json")))
   for name, cell in doc["sprites"]:
     result.cells[name] = (cell["x"].getInt(), cell["y"].getInt(),
                           cell["w"].getInt(), cell["h"].getInt())
 
-proc newRenderer*(): Renderer =
-  Renderer(atlas: loadAtlas(), spriteIds: initTable[string, int](),
+proc newRenderer*(atlasName = "atlas"): Renderer =
+  ## The atlas is per YEAR (`YearSpec.atlas`): `atlas` for bc26, `atlas_bc20`
+  ## for the 2020 sprite set cut from the official client (credited in NOTICE).
+  Renderer(atlas: loadAtlas(atlasName), spriteIds: initTable[string, int](),
            nextSpriteId: AtlasSpriteBase, sentSprites: initHashSet[int](),
-           liveObjects: initHashSet[int](), terrainGame: -1)
+           liveObjects: initHashSet[int](),
+           prevRobotSprite: initTable[int, int](),
+           terrainGame: -1, terrainStage: -1, atlasName: atlasName)
 
 proc straightPixels(image: Image): seq[uint8] =
   ## `broadcast_core.js` blends sprites with straight (non-premultiplied)
@@ -256,3 +281,115 @@ proc buildPacket*(r: Renderer, w: World, gameIndex, sideAslot: int,
   ## never drawn; `broadcast_core.js` routes it straight to `onText`.
   packet.addSprite(BroadcastChromeSpriteId, 1, 1, [0'u8, 0, 0, 0], chrome)
   packet
+
+# ---------------------------------------------------------------------------
+#  bc20 — a heightmap under a rising sea
+# ---------------------------------------------------------------------------
+
+proc bc20SpriteName(r: w20.Robot, sideAslot: int): string =
+  ## Palette follows the ENGINE SIDE, not the seat: red = side A, blue = side
+  ## B, exactly as the 2020 client draws it. Because sides alternate every game
+  ## the scorebug plate keeps the alias constant and recolours its swatch.
+  let tint = if r.team == w20.teamA: "_red" else: "_blue"
+  case r.kind
+  of c20.rtHq: "hq" & tint
+  of c20.rtMiner: "miner" & tint
+  of c20.rtLandscaper: "landscaper" & tint
+  of c20.rtDeliveryDrone:
+    (if r.holdingUnit: "drone" & tint & "_carry" else: "drone" & tint)
+  of c20.rtRefinery: "refinery" & tint
+  of c20.rtVaporator: "vaporator" & tint
+  of c20.rtDesignSchool: "design_school" & tint
+  of c20.rtFulfillmentCenter: "fulfillment_center" & tint
+  of c20.rtNetGun: "net_gun" & tint
+  of c20.rtCow: "cow"
+
+proc renderBc20Terrain(r: Renderer, w: w20.World): Image =
+  ## A nine-step elevation ramp keyed to the CURRENT water level, plus a water
+  ## overlay on flooded tiles. Re-cut only when the water crosses an integer
+  ## level, so a 1499-round game sends seven terrain sprites, not 1499.
+  result = newImage(w.width * TileSize, w.height * TileSize)
+  result.fill(FloorColor)
+  let ctx = newContext(result)
+  let level = w.waterLevel
+  for y in 0 ..< w.height:
+    for x in 0 ..< w.width:
+      let l = w20.loc(x, y)
+      let px = x * TileSize
+      ## The board's y axis grows NORTH; the canvas grows down.
+      let py = (w.height - 1 - y) * TileSize
+      let elevation = w20.getDirt(w, l)
+      var colour: ColorRGBA
+      if w20.isFlooded(w, l):
+        colour = if float32(elevation) < level - 2.0'f32:
+                   Bc20DeepWaterColor else: Bc20WaterColor
+      else:
+        let step = clamp(int(floor(float(elevation) - float(level))) + 2,
+                         0, Bc20Ramp.high)
+        colour = Bc20Ramp[step]
+      ctx.fillStyle = colour
+      ctx.fillRect(rect(float32(px), float32(py),
+                        float32(TileSize), float32(TileSize)))
+
+proc buildBc20Packet(r: Renderer, w: w20.World, gameIndex, sideAslot: int,
+                     chrome: string): seq[uint8] =
+  var packet: seq[uint8]
+  let n = w.width * w.height
+  let stage = f20.floodStageFor(w.waterLevel)
+  let newGame = r.terrainGame != gameIndex
+
+  if newGame:
+    r.terrainGame = gameIndex
+    r.terrainStage = -1
+    r.liveObjects.clear()
+    r.prevRobotSprite.clear()
+    packet.addClearObjects()
+    packet.addLayer(MapLayerId, MapLayerKind, ZoomableFlag)
+    packet.addViewport(MapLayerId, w.width * TileSize, w.height * TileSize)
+    r.prevSoup = newSeq[int](n)
+    for i in 0 ..< n: r.prevSoup[i] = -1
+
+  if stage != r.terrainStage:
+    r.terrainStage = stage
+    let terrain = r.renderBc20Terrain(w)
+    packet.addSprite(TerrainSpriteId, terrain.width, terrain.height,
+      straightPixels(terrain), "terrain")
+    packet.addObject(1, 0, 0, -32768, MapLayerId, TerrainSpriteId)
+
+  let soupSprite = r.spriteId(packet, "soup")
+  for i in 0 ..< n:
+    let here = if w.soup[i] > 0: 1 else: 0
+    if here == r.prevSoup[i]: continue
+    r.prevSoup[i] = here
+    let l = w20.indexToLoc(w, i)
+    if here == 1:
+      r.addObj(packet, SoupObjectBase + i, l.x * TileSize,
+        (w.height - 1 - l.y) * TileSize, 2, soupSprite)
+    else:
+      r.dropObj(packet, SoupObjectBase + i)
+
+  ## Robots. Object ids are stable for a robot's whole life, so the client's
+  ## motion interpolation can glide it between rounds instead of teleporting.
+  var seen = initHashSet[int]()
+  for id, robot in w.robotsById:
+    if robot.blocked: continue          ## riding inside a drone
+    let objectId = RobotObjectBase + (id mod 20000)
+    seen.incl(objectId)
+    let sprite = r.spriteId(packet, bc20SpriteName(robot, sideAslot))
+    r.addObj(packet, objectId, robot.loc.x * TileSize,
+      (w.height - 1 - robot.loc.y) * TileSize, 5, sprite)
+
+  for objectId in toSeq(r.liveObjects):
+    if objectId >= RobotObjectBase and objectId < SoupObjectBase and
+        objectId notin seen:
+      r.dropObj(packet, objectId)
+
+  packet.addSprite(BroadcastChromeSpriteId, 1, 1, [0'u8, 0, 0, 0], chrome)
+  packet
+
+proc buildSessionPacket*(r: Renderer, s: Session, chrome: string): seq[uint8] =
+  ## The ONE place the renderer branches on the year. `Session` is an object
+  ## variant, so the compiler checks that a new year gets an arm here.
+  case s.year
+  of yBc26: r.buildPacket(s.w26, s.gameIndex, s.sideAslot, chrome)
+  of yBc20: r.buildBc20Packet(s.w20, s.gameIndex, s.sideAslot, chrome)
diff --git a/src/battlecode/replay.nim b/src/battlecode/replay.nim
index d89796c..a3ba7f8 100644
--- a/src/battlecode/replay.nim
+++ b/src/battlecode/replay.nim
@@ -11,7 +11,7 @@
 import std/[json, strutils]
 import crunchy/sha256
 import sim_types, sheet, match, results
-import years/bc26/maps
+import years/dispatch
 
 export match
 
@@ -53,9 +53,9 @@ proc sha256Hex*(data: string): string =
   for b in sha256(data):
     result.add(toHex(b, 2).toLowerAscii())
 
-proc mapSha*(name: string): string =
+proc mapSha*(year, name: string): string =
   try:
-    sha256Hex(readFile(mapPath(name)))
+    sha256Hex(readFile(mapPathFor(year, name)))
   except CatchableError:
     ""
 
@@ -69,6 +69,7 @@ proc seatJson(seat: SeatReport, slot: int): JsonNode =
     "alias": seat.alias,
     "name": seat.name,
     "policy": seat.policyKind,
+    "chassis": seat.chassis,
     "sheet": seat.sheet.toJson(),
     "sheet_submitted": seat.sheet.submitted,
     "sheet_defaults_applied": applied,
@@ -152,13 +153,12 @@ type
     roundInGame*: int
     frame*: int
     totalFrames*: int
-    world*: World
-    clans*: array[2, Clan]
+    session*: Session
     mismatchRound*: int
     frameGame*: seq[int]
     frameRound*: seq[int]
 
-proc parseSeat(node: JsonNode): SeatReport =
+proc parseSeat(node: JsonNode, year: string): SeatReport =
   result.name = node{"name"}.getStr()
   result.alias = node{"alias"}.getStr()
   result.policyKind = node{"policy"}.getStr("scripted")
@@ -173,12 +173,15 @@ proc parseSeat(node: JsonNode): SeatReport =
   wrapper["sheet"] = node{"sheet"}
   wrapper["notes"] = %node{"notes"}.getStr()
   wrapper["motto"] = %node{"motto"}.getStr()
-  result.sheet = validate(wrapper)
-  ## `chassis` is not a knob, so `validate` does not read it — but the
-  ## deriver has to run the bot the recording ran or every round mismatches.
-  ## It rides in the applied sheet and is restored here.
-  result.sheet.doctrine.chassis =
-    parseChassis(node{"sheet"}{"chassis"}.getStr("awu"))
+  result.sheet = validate(wrapper, year)
+  ## `chassis` is not a knob, so `validate` does not read it — but the deriver
+  ## has to run the bot the recording ran or every round mismatches. bc26 rides
+  ## it in the applied sheet; bc20 records it on the SEAT, beside the policy
+  ## kind. Both are restored here.
+  result.chassis = node{"chassis"}.getStr("")
+  if year != "bc20":
+    result.sheet.doctrine.chassis =
+      parseChassis(node{"sheet"}{"chassis"}.getStr("awu"))
   result.sheet.notes = node{"notes"}.getStr()
   result.sheet.motto = node{"motto"}.getStr()
   result.sheet.submitted = node{"sheet_submitted"}.getStr("{}")
@@ -200,7 +203,7 @@ proc parseReplay*(text: string): ReplayDoc =
   result.promptPreamble = doc{"prompt_preamble"}.getStr()
   for slot in 0 .. 1:
     result.names[slot] = doc["names"][slot].getStr()
-    result.seats[slot] = parseSeat(doc["seats"][slot])
+    result.seats[slot] = parseSeat(doc["seats"][slot], result.year)
   for g in doc["games"]:
     result.games.add(GameHeader(
       index: g{"index"}.getInt(),
@@ -231,14 +234,17 @@ proc parseReplay*(text: string): ReplayDoc =
   for v in plan["abandon_after"]: result.plan.abandonAfter.add(v.getInt())
   result.plan.sheets[0] = result.seats[0].sheet
   result.plan.sheets[1] = result.seats[1].sheet
+  for slot in 0 .. 1:
+    result.plan.chassis[slot] =
+      parseChassisKind(doc["seats"][slot]{"chassis"}.getStr("bowl-of-chowder"))
 
 proc startGame(d: Deriver, index: int) =
   d.gameIndex = index
   d.roundInGame = 0
   if index < d.doc.plan.maps.len:
-    let spec = loadMap(d.doc.plan.maps[index])
-    d.world = newWorld(spec, d.doc.plan.maxRounds)
-    d.clans = newClans(d.doc.plan.sheets, d.doc.plan.sideAslots[index])
+    d.session = newSession(d.doc.year, d.doc.plan.maps[index],
+      d.doc.plan.sheets, d.doc.plan.sideAslots[index], d.doc.plan.maxRounds,
+      d.doc.plan.chassis, index)
 
 proc gameRecord*(doc: ReplayDoc, index: int):
     tuple[rounds: int, chain: string, rounds_chains: string] =
@@ -281,10 +287,10 @@ proc advance*(d: Deriver): bool {.discardable.} =
     return false
   let nextFrame = d.frame + 1
   let wantGame = d.frameGame[nextFrame]
-  if wantGame != d.gameIndex or d.world == nil:
+  if wantGame != d.gameIndex or d.session == nil:
     d.startGame(wantGame)
-  runRound(d.world, d.clans)
-  d.roundInGame = d.world.currentRound
+  d.session.stepRound()
+  d.roundInGame = d.session.currentRound
   d.frame = nextFrame
   ## The recorded hash chain proves the re-derivation matches the recording.
   ## EVERY round is compared, against the chain the recorder was on at the end
@@ -294,7 +300,7 @@ proc advance*(d: Deriver): bool {.discardable.} =
   if d.mismatchRound < 0:
     let record = d.doc.gameRecord(wantGame)
     let at = (d.roundInGame - 1) * ChainHexLen
-    let here = toHex(d.world.hashChain)
+    let here = d.session.hashChainHex()
     if record.rounds_chains.len >= at + ChainHexLen and
         here != record.rounds_chains[at ..< at + ChainHexLen]:
       d.mismatchRound = d.roundInGame
diff --git a/src/battlecode/results.nim b/src/battlecode/results.nim
index 2f8615a..b806080 100644
--- a/src/battlecode/results.nim
+++ b/src/battlecode/results.nim
@@ -4,9 +4,8 @@
 ## key set `tools/ci/docker_smoke.sh` asserts are the same set, and
 ## `tests/test_manifest.nim` fails when any one of them drifts.
 
-import std/[json, strutils]
+import std/json
 import sim_types, sheet, match
-import years/bc26/rules
 
 type
   SeatReport* = object
@@ -18,29 +17,28 @@ type
     fallback*: string         ## "" when the seat's own doctrine was used
     fallbackDetail*: string   ## the provider's own words, <= 200 runes
     brief*: string            ## the prompt payload composed for this seat
+    chassis*: string          ## D1: fixed by the operator, never a sheet field
 
 proc gamesJson(games: seq[GameOutcome]): JsonNode =
+  ## The five YEAR-NEUTRAL keys are always present and always required; the
+  ## year's own statistics ride beside them as optional siblings. Deliberately
+  ## NOT a nested `stats` object: nesting would change the bytes every shipped
+  ## bc26 replay's `result` block carries and force a compatibility shim in the
+  ## endcard. Relaxing `required` changes nothing that already exists.
   result = newJArray()
   for g in games:
-    result.add(%*{
+    var entry = %*{
       "map": g.mapName,
       "side": [(if g.sideAslot == 0: "A" else: "B"),
                (if g.sideAslot == 0: "B" else: "A")],
       "rounds_played": g.roundsPlayed,
       "winner": g.winnerSlot,
-      "end_reason": $g.endReason,
-      "cooperation_at_end": g.cooperationAtEnd,
-      "backstab_round": g.backstabRound,
-      "backstab_by": g.backstabBySlot,
-      "cat_damage": [g.catDamage[0], g.catDamage[1]],
-      "cheese_transferred": [g.cheeseTransferred[0], g.cheeseTransferred[1]],
-      "kings_alive": [g.kingsAlive[0], g.kingsAlive[1]],
-      "kings_built": [g.kingsBuilt[0], g.kingsBuilt[1]],
-      "rats_built": [g.ratsBuilt[0], g.ratsBuilt[1]],
-      "rats_alive": [g.ratsAlive[0], g.ratsAlive[1]],
-      "traps_placed": [g.trapsPlaced[0], g.trapsPlaced[1]],
-      "dirt_placed": [g.dirtPlaced[0], g.dirtPlaced[1]]
-    })
+      "end_reason": g.endReason
+    }
+    if g.stats != nil and g.stats.kind == JObject:
+      for key, value in g.stats:
+        entry[key] = value
+    result.add(entry)
 
 proc resultsJson*(
   seats: array[2, SeatReport],
@@ -96,6 +94,34 @@ proc resultsJson*(
     "game_version": GameVersion
   }
 
+const RequiredGameKeys* = [
+  "map", "side", "rounds_played", "winner", "end_reason"
+]
+  ## The year-neutral keys `results.games[].required` names.
+
+const Bc26GameKeys* = [
+  "cooperation_at_end", "backstab_round", "backstab_by", "cat_damage",
+  "cheese_transferred", "kings_alive", "kings_built", "rats_built",
+  "rats_alive", "traps_placed", "dirt_placed"
+]
+
+const Bc20GameKeys* = [
+  "hq_alive", "hq_lost_round", "hq_lost_cause", "soup_mined", "soup_refined",
+  "net_worth", "units_alive", "units_built", "miners_built",
+  "landscapers_built", "drones_built", "vaporators_built", "net_guns_built",
+  "dirt_moved", "drone_pickups", "drone_water_drops", "net_gun_kills",
+  "transactions_sent", "transactions_minted", "blockchain_soup_spent",
+  "global_pollution_peak", "flooded_tiles_end", "water_level_end"
+]
+
+const EndReasons* = [
+  "kings_destroyed", "cats_cleared", "round_limit", "abandoned",
+  "hq_destroyed", "quantity", "quality", "broadcasts", "highest_id",
+  "coin_flip"
+]
+  ## The union of both years' `DominationFactor` renderings plus our own
+  ## wall-clock `abandoned`.
+
 const ResultsKeys* = [
   "names", "aliases", "scores", "wins", "points", "games", "seed", "year",
   "policy_kind", "sheet_defaults_applied", "fallbacks", "decision_ms",
@@ -105,11 +131,9 @@ const ResultsKeys* = [
   ## manifest's `results_schema.required` and the list `docker_smoke.sh`
   ## checks.
 
-const GameKeys* = [
-  "map", "side", "rounds_played", "winner", "end_reason",
-  "cooperation_at_end", "backstab_round", "backstab_by", "cat_damage",
-  "cheese_transferred", "kings_alive", "kings_built", "rats_built",
-  "rats_alive", "traps_placed", "dirt_placed"
-]
+const GameKeys* = @RequiredGameKeys & @Bc26GameKeys
+  ## The key set a bc26 game emits, unchanged: the five required keys plus
+  ## bc26's eleven. `tests/test_manifest.nim` checks both years against the
+  ## manifest's `results_schema`.
 
 const EpisodeReasons* = ["complete", "deadline", "fault"]
diff --git a/src/battlecode/server.nim b/src/battlecode/server.nim
index d73c911..1c36052 100644
--- a/src/battlecode/server.nim
+++ b/src/battlecode/server.nim
@@ -17,8 +17,7 @@ import std/[json, locks, monotimes, os, strutils, times]
 import mummy, mummy/routers
 import bitworld/[runtime, spriteprotocol]
 import seats, sim_types, sheet, baselines, decide, match, replay, results
-import years/[registry]
-import years/bc26/maps
+import years/[registry, dispatch]
 
 type
   AppState = object
@@ -114,7 +113,7 @@ proc applyRegistration(slot: int, payload: string) =
       app.policy[slot].registered = true
       app.policy[slot].prompt = prompt
       app.policy[slot].isLlm = prompt.len > 0
-      app.policy[slot].baseline = parseBaseline(scripted)
+      app.policy[slot].scripted = scripted
       app.policy[slot].label = block:
         let explicit = node{"policy"}.getStr().strip()
         if explicit.len > 0: explicit
@@ -309,7 +308,7 @@ proc parseConfig*(text: string): GameConfig =
   if result.numAgents != 2:
     raise newException(ConfigError,
       "battlecode is a two-seat game; num_agents was " & $result.numAgents)
-  if poolNames(result.pool).len == 0:
+  if poolNamesFor(result.year, result.pool).len == 0:
     raise newException(ConfigError, "unknown pool " & result.pool)
   result.maxRounds = min(result.maxRounds, yearSpec(result.year).maxRounds)
 
@@ -344,7 +343,13 @@ proc runEpisode*(runtimeConfig: RuntimeConfig, config: GameConfig) =
       policy = app.policy
 
   let seed = if config.seed != 0: config.seed else: randomSeed()
-  plan = buildPlan(config, [defaultSheet(), defaultSheet()], seed)
+  plan = buildPlan(config, [defaultSheet(config.year),
+                            defaultSheet(config.year)], seed)
+  ## D1: the chassis is fixed by the OPERATOR, never by the sheet. A scripted
+  ## seat drives the chassis its `PLAYER_SCRIPTED` names; an LLM seat drives
+  ## the fixed champion chassis.
+  for slot in 0 .. 1:
+    plan.chassis[slot] = chassisForSeat(config.year, policy[slot])
   events.add(ev("episode_start", ms = 0, fields = %*{
     "seed": seed, "year": config.year, "maps": plan.maps,
     "aliases": [AliasA, AliasB]}))
@@ -378,7 +383,9 @@ proc runEpisode*(runtimeConfig: RuntimeConfig, config: GameConfig) =
       decisionMs: decision.decisionMs[slot],
       fallback: decision.fallback[slot],
       fallbackDetail: decision.fallbackDetail[slot],
-      brief: decision.briefs[slot])
+      brief: decision.briefs[slot],
+      chassis: chassisNameFor(config.year, policy[slot],
+                              decision.sheets[slot]))
 
   events.add(ev("episode_end", ms = 0, fields = %*{"reason": $reason}))
   let wallClock = (getMonoTime() - episodeStart).inMilliseconds.float / 1000.0
@@ -392,12 +399,13 @@ proc runEpisode*(runtimeConfig: RuntimeConfig, config: GameConfig) =
       "num_agents": config.numAgents},
     seed: seed, seats: seats, events: events, result: resultsDoc, plan: plan,
     promptPreamble: (if decision.briefs[0].len > 0 or
-                        decision.briefs[1].len > 0: SystemPreamble else: ""))
+                        decision.briefs[1].len > 0: preambleFor(config.year)
+                     else: ""))
   for slot in 0 .. 1:
     doc.names[slot] = seats[slot].name
   for g in games:
     doc.games.add(GameHeader(index: g.index, map: g.mapName,
-      mapSha: mapSha(g.mapName), sideAslot: g.sideAslot,
+      mapSha: mapSha(config.year, g.mapName), sideAslot: g.sideAslot,
       rounds: g.roundsPlayed, hashChain: g.hashChain,
       roundChains: g.roundChains))
 
diff --git a/src/battlecode/sheet.nim b/src/battlecode/sheet.nim
index 275d490..dba1477 100644
--- a/src/battlecode/sheet.nim
+++ b/src/battlecode/sheet.nim
@@ -1,5 +1,11 @@
-## The doctrine sheet: what a cog may say, how a reply is parsed TOLERANTLY,
-## and how an illegal field is repaired instead of rejected.
+## The doctrine sheet ENVELOPE: what a cog may say, how a reply is parsed
+## TOLERANTLY, and how an illegal field is repaired instead of rejected.
+##
+## Year-neutral. The knob TABLE for a year — its types, its defaults, its
+## ranges, its repair order and its plain-words readout — lives in
+## `years/<year>/knobs.nim`; this file owns `notes`, `motto`,
+## `defaultsApplied`, `unknownFields`, `submitted` and the dispatch into the
+## year. The tolerant-parsing primitives live in `sheet_common.nim`.
 ##
 ## Both policy kinds — an LLM reply and a scripted baseline — go through this
 ## same `validate`, which is what makes `tests/test_baselines.nim`'s
@@ -9,192 +15,53 @@
 ## A sheet can never be REJECTED. An unknown key is recorded and ignored; a
 ## mistyped or out-of-range value takes that field's default. A cog therefore
 ## cannot forfeit a match by answering badly, only by answering weakly.
+##
+## `chassis` is NOT a knob in either year (D1). bc26 keeps the field on its
+## `Doctrine` because the scripted filler path sets it directly and the replay
+## records it; bc20 has no such field at all — its chassis is a `ChassisKind`
+## the operator picks, carried on the seat record.
 
-import std/[json, strutils, tables, unicode]
-import sim_types
-
-type
-  Chassis* = enum
-    chAwu = "awu"
-    chScaffold = "scaffold"
-
-  BackstabPolicy* = enum
-    bpNever = "never"
-    bpWhenAhead = "when_ahead"
-    bpAtRoundN = "at_round_N"
-    bpOnFirstContact = "on_first_contact"
-    bpRetaliateOnly = "retaliate_only"
-
-  CatEngagement* = enum
-    ceAvoid = "avoid"
-    ceOpportunistic = "opportunistic"
-    ceHunt = "hunt"
-    ceFeed = "feed"
-
-  SpawnCurve* = enum
-    scLean = "lean"
-    scSteady = "steady"
-    scSwarm = "swarm"
+import std/[json, tables]
+import sim_types, sheet_common
+import years/bc26/knobs as knobs26
+import years/bc20/knobs as knobs20
 
-  DirtWallPolicy* = enum
-    dwNone = "none"
-    dwKingShell = "king_shell"
-    dwChoke = "choke"
+export sim_types, sheet_common, knobs26, knobs20
 
-  Doctrine* = object
-    ## The 10 doctrine knobs, each with a named site in the chassis
-    ## (docs/RULES.md §The doctrine sheet lists the site per knob), plus the
-    ## chassis selector, which is NOT one of them.
-    chassis*: Chassis
-      ## NOT A KNOB. An LLM doctrine always runs `awu`: `chassis` is absent
-      ## from `KnownKeys` and from the prompt's knob list, so a reply that
-      ## names it is recorded in `unknownFields` and ignored. The only way to
-      ## select `scaffold` is the scripted filler path
-      ## (`PLAYER_SCRIPTED=scaffold` → `baselines.baselineSheet`), which sets
-      ## this field directly rather than through the sheet.
-    backstabPolicy*: BackstabPolicy
-    backstabRound*: int
-    catEngagement*: CatEngagement
-    catTrapBudget*: int
-    ratTrapBudget*: int
-    spawnCurve*: SpawnCurve
-    cheeseFerryRatio*: float
-    kingCountTarget*: int
-    dirtWallPolicy*: DirtWallPolicy
-    throwRatsToFeedCats*: bool
+const
+  YearBc26* = "bc26"
+  YearBc20* = "bc20"
 
+type
   Sheet* = object
-    doctrine*: Doctrine
+    year*: string
+    doctrine*: knobs26.Doctrine       ## the bc26 knobs; defaults on a bc20 sheet
+    doctrine20*: knobs20.Doctrine20   ## the bc20 knobs; defaults on a bc26 sheet
     notes*: string
     motto*: string
     defaultsApplied*: seq[string]
     unknownFields*: seq[string]
     submitted*: string   ## the raw sheet object as received, for the replay
 
-const
-  KnownKeys* = [
-    "backstab_policy", "backstab_round", "cat_engagement",
-    "cat_trap_budget", "rat_trap_budget", "spawn_curve", "cheese_ferry_ratio",
-    "king_count_target", "dirt_wall_policy", "throw_rats_to_feed_cats"
-  ]
-    ## THE LLM-VISIBLE KNOB SURFACE, and the same list the prompt preamble
-    ## prints. `chassis` is deliberately not in it: which bot drives the clan
-    ## is not a strategic choice a cog gets to make, it is which policy the
-    ## operator ran. A reply that sends `chassis` is treated as any other
-    ## unknown key — recorded, ignored, and the clan plays `awu`.
-
-proc defaultDoctrine*(): Doctrine =
-  Doctrine(
-    chassis: chAwu,
-    backstabPolicy: bpRetaliateOnly,
-    backstabRound: 600,
-    catEngagement: ceOpportunistic,
-    catTrapBudget: 40,
-    ratTrapBudget: 60,
-    spawnCurve: scSteady,
-    cheeseFerryRatio: 0.5,
-    kingCountTarget: 3,
-    dirtWallPolicy: dwKingShell,
-    throwRatsToFeedCats: false
-  )
-
-proc defaultSheet*(): Sheet =
-  Sheet(doctrine: defaultDoctrine(), notes: "", motto: "", submitted: "{}")
-
-proc normalizeKey(text: string): string =
-  text.strip().toLowerAscii().replace("-", "_").replace(" ", "_")
-
-proc enumFromText[T: enum](text: string, fallback: T): T =
-  let key = normalizeKey(text)
-  for value in T:
-    if normalizeKey($value) == key:
-      return value
-  fallback
-
-proc readNumber(node: JsonNode): tuple[ok: bool, value: float] =
-  ## An int, a float, or a numeric string. Anything non-finite reports
-  ## `ok = false` so the caller applies the field's default rather than
-  ## inventing a value.
-  if node.isNil: return (false, 0.0)
-  case node.kind
-  of JInt: (true, float(node.getBiggestInt()))
-  of JFloat:
-    let f = node.getFloat()
-    if f != f or f > 1.0e9 or f < -1.0e9: (false, 0.0) else: (true, f)
-  of JString:
-    try: (true, parseFloat(node.getStr().strip()))
-    except CatchableError: (false, 0.0)
-  of JBool: (true, (if node.getBool(): 1.0 else: 0.0))
-  else: (false, 0.0)
-
-proc readBool(node: JsonNode): tuple[ok: bool, value: bool] =
-  if node.isNil: return (false, false)
-  case node.kind
-  of JBool: (true, node.getBool())
-  of JInt: (true, node.getBiggestInt() != 0)
-  of JString:
-    case normalizeKey(node.getStr())
-    of "true", "yes", "1", "on": (true, true)
-    of "false", "no", "0", "off": (true, false)
-    else: (false, false)
-  else: (false, false)
-
-proc extractJsonObject*(text: string): JsonNode =
-  ## The outermost balanced `{...}` in a model reply, tolerating markdown
-  ## fences and any prose around it. Falls back to first-brace..last-brace,
-  ## which recovers a reply whose braces sit inside a quoted string.
-  var
-    depth = 0
-    start = -1
-    inString = false
-    escaped = false
-  for i, ch in text:
-    if inString:
-      if escaped: escaped = false
-      elif ch == '\\': escaped = true
-      elif ch == '"': inString = false
-      continue
-    case ch
-    of '"': inString = true
-    of '{':
-      if depth == 0: start = i
-      inc depth
-    of '}':
-      if depth > 0:
-        dec depth
-        if depth == 0 and start >= 0:
-          try:
-            return parseJson(text[start .. i])
-          except CatchableError:
-            start = -1
-    else: discard
-  let
-    first = text.find('{')
-    last = text.rfind('}')
-  if first < 0 or last <= first:
-    raise newException(BattlecodeError,
-      "no JSON object in reply: " & text.strip().truncateRunes(160).
-        replace("\n", " "))
-  parseJson(text[first .. last])
+proc knownKeysFor*(year: string): seq[string] =
+  if year == YearBc20:
+    @(knobs20.KnownKeys20)
+  else:
+    @(knobs26.KnownKeys)
 
-proc parseChassis*(text: string): Chassis =
-  ## The RECORDED chassis, read back on playback. `validate` never reads
-  ## `chassis` — it is not a knob — so the replay's applied sheet is the only
-  ## place the deriver can learn which bot actually drove a clan. Anything
-  ## unrecognised is `awu`, the chassis every LLM doctrine runs.
-  let key = normalizeKey(text)
-  for value in Chassis:
-    if $value == key:
-      return value
-  chAwu
+proc defaultSheet*(year = YearBc26): Sheet =
+  Sheet(year: year, doctrine: knobs26.defaultDoctrine(),
+        doctrine20: knobs20.defaultDoctrine20(),
+        notes: "", motto: "", submitted: "{}")
 
-proc validate*(payload: JsonNode): Sheet =
+proc validate*(payload: JsonNode, year = YearBc26): Sheet =
   ## Turn one parsed reply into a legal `Sheet`. Never raises: every bounded
   ## field is repaired to its default and the repair is recorded, so a cog
   ## always ends the doctrine phase with a playable doctrine.
-  result = defaultSheet()
+  result = defaultSheet(year)
+  let known = knownKeysFor(year)
   if payload.isNil or payload.kind != JObject:
-    result.defaultsApplied = @KnownKeys
+    result.defaultsApplied = known
     return
 
   let sheetNode =
@@ -211,156 +78,41 @@ proc validate*(payload: JsonNode): Sheet =
     if keyCount > MaxSheetKeys:
       break
     let norm = normalizeKey(key)
-    if norm in KnownKeys:
+    if norm in known:
       seen[norm] = value
     elif result.unknownFields.len < MaxUnknownFields:
+      ## This is where a submitted `chassis` lands, in EITHER year (D1):
+      ## recorded, never honoured.
       result.unknownFields.add(key.truncateRunes(MaxUnknownFieldRunes))
 
-  template repair(name: string) =
-    result.defaultsApplied.add(name)
-
-  # --- chassis is NOT read here --------------------------------------------
-  # It is not in `KnownKeys`, so the loop above has already recorded it in
-  # `unknownFields`; `result.doctrine.chassis` keeps `defaultDoctrine()`'s
-  # `awu`. `decide.nim` logs the seat that tried.
-
-  # --- backstab_policy / backstab_round ------------------------------------
-  if "backstab_policy" in seen:
-    if seen["backstab_policy"].kind == JString:
-      let text = normalizeKey(seen["backstab_policy"].getStr())
-      var found = false
-      for value in BackstabPolicy:
-        if normalizeKey($value) == text:
-          result.doctrine.backstabPolicy = value
-          found = true
-      if not found: repair("backstab_policy")
-    else:
-      repair("backstab_policy")
-  if "backstab_round" in seen:
-    let n = readNumber(seen["backstab_round"])
-    if n.ok and n.value >= 1.0 and n.value <= 2000.0:
-      result.doctrine.backstabRound = int(n.value)
-    else:
-      repair("backstab_round")
-
-  # --- cat_engagement ------------------------------------------------------
-  if "cat_engagement" in seen:
-    if seen["cat_engagement"].kind == JString:
-      let text = normalizeKey(seen["cat_engagement"].getStr())
-      var found = false
-      for value in CatEngagement:
-        if normalizeKey($value) == text:
-          result.doctrine.catEngagement = value
-          found = true
-      if not found: repair("cat_engagement")
-    else:
-      repair("cat_engagement")
-
-  # --- integer budgets -----------------------------------------------------
-  template intKnob(name: string, field: untyped, lo, hi: int) =
-    if name in seen:
-      let n = readNumber(seen[name])
-      if n.ok and n.value >= float(lo) and n.value <= float(hi):
-        field = int(n.value)
-      else:
-        repair(name)
-
-  intKnob("cat_trap_budget", result.doctrine.catTrapBudget, 0, 200)
-  intKnob("rat_trap_budget", result.doctrine.ratTrapBudget, 0, 200)
-  intKnob("king_count_target", result.doctrine.kingCountTarget, 1, 5)
-
-  # --- spawn_curve ---------------------------------------------------------
-  if "spawn_curve" in seen:
-    if seen["spawn_curve"].kind == JString:
-      let text = normalizeKey(seen["spawn_curve"].getStr())
-      var found = false
-      for value in SpawnCurve:
-        if normalizeKey($value) == text:
-          result.doctrine.spawnCurve = value
-          found = true
-      if not found: repair("spawn_curve")
-    else:
-      repair("spawn_curve")
-
-  # --- cheese_ferry_ratio --------------------------------------------------
-  if "cheese_ferry_ratio" in seen:
-    let n = readNumber(seen["cheese_ferry_ratio"])
-    if n.ok and n.value >= 0.0 and n.value <= 1.0:
-      result.doctrine.cheeseFerryRatio = n.value
-    else:
-      repair("cheese_ferry_ratio")
-
-  # --- dirt_wall_policy ----------------------------------------------------
-  if "dirt_wall_policy" in seen:
-    if seen["dirt_wall_policy"].kind == JString:
-      let text = normalizeKey(seen["dirt_wall_policy"].getStr())
-      var found = false
-      for value in DirtWallPolicy:
-        if normalizeKey($value) == text:
-          result.doctrine.dirtWallPolicy = value
-          found = true
-      if not found: repair("dirt_wall_policy")
-    else:
-      repair("dirt_wall_policy")
-
-  # --- throw_rats_to_feed_cats ---------------------------------------------
-  if "throw_rats_to_feed_cats" in seen:
-    let b = readBool(seen["throw_rats_to_feed_cats"])
-    if b.ok:
-      result.doctrine.throwRatsToFeedCats = b.value
-    else:
-      repair("throw_rats_to_feed_cats")
+  if year == YearBc20:
+    result.doctrine20 = knobs20.applyKnobs20(seen, result.defaultsApplied)
+  else:
+    result.doctrine = knobs26.applyKnobs(seen, result.defaultsApplied)
 
   # --- free text -----------------------------------------------------------
   result.notes = sanitizeLine(payload{"notes"}.getStr(), MaxNoteRunes)
   result.motto = sanitizeLine(payload{"motto"}.getStr(), MaxMottoRunes)
 
-proc parseReply*(text: string): Sheet =
+proc parseReply*(text: string, year = YearBc26): Sheet =
   ## Tolerant end-to-end parse of one model reply. Raises only when there is
   ## no JSON object at all — the one condition the retry and then the
   ## scripted fallback exist for.
   ## MaxReplyBytes is BYTES (the note's cap table says 16 KB), cut on a rune
   ## boundary — `truncateRunes` here kept 16384 runes, i.e. up to 64 KB.
   let capped = text.truncateBytes(MaxReplyBytes)
-  validate(extractJsonObject(capped))
+  validate(extractJsonObject(capped), year)
 
 proc toJson*(sheet: Sheet): JsonNode =
-  %*{
-    "chassis": $sheet.doctrine.chassis,
-    "backstab_policy": $sheet.doctrine.backstabPolicy,
-    "backstab_round": sheet.doctrine.backstabRound,
-    "cat_engagement": $sheet.doctrine.catEngagement,
-    "cat_trap_budget": sheet.doctrine.catTrapBudget,
-    "rat_trap_budget": sheet.doctrine.ratTrapBudget,
-    "spawn_curve": $sheet.doctrine.spawnCurve,
-    "cheese_ferry_ratio": sheet.doctrine.cheeseFerryRatio,
-    "king_count_target": sheet.doctrine.kingCountTarget,
-    "dirt_wall_policy": $sheet.doctrine.dirtWallPolicy,
-    "throw_rats_to_feed_cats": sheet.doctrine.throwRatsToFeedCats
-  }
+  if sheet.year == YearBc20:
+    knobs20.toJson20(sheet.doctrine20)
+  else:
+    knobs26.toJson(sheet.doctrine)
 
 proc plainWords*(sheet: Sheet): seq[string] =
-  ## The endcard/`#doctrines` readout: the sheet in words a spectator can
+  ## The endcard/doctrine-overlay readout: the sheet in words a spectator can
   ## read without knowing the schema.
-  case sheet.doctrine.backstabPolicy
-  of bpNever: result.add("never betrays")
-  of bpRetaliateOnly: result.add("retaliates only")
-  of bpWhenAhead: result.add("betrays when ahead")
-  of bpAtRoundN: result.add("betrays at round " & $sheet.doctrine.backstabRound)
-  of bpOnFirstContact: result.add("betrays on first contact")
-  case sheet.doctrine.catEngagement
-  of ceAvoid: result.add("avoids cats")
-  of ceOpportunistic: result.add("fights cats when handy")
-  of ceHunt: result.add("hunts cats")
-  of ceFeed: result.add("feeds rats to cats")
-  result.add($sheet.doctrine.spawnCurve & " spawning")
-  result.add("keeps " & $sheet.doctrine.kingCountTarget & " kings")
-  result.add($sheet.doctrine.ratTrapBudget & " rat traps")
-  result.add($sheet.doctrine.catTrapBudget & " cat traps")
-  result.add($int(sheet.doctrine.cheeseFerryRatio * 100) & "% ferrying")
-  case sheet.doctrine.dirtWallPolicy
-  of dwNone: result.add("no dirt work")
-  of dwKingShell: result.add("walls its kings in")
-  of dwChoke: result.add("walls the chokepoints")
-  if sheet.doctrine.throwRatsToFeedCats:
-    result.add("throws rats to cats")
+  if sheet.year == YearBc20:
+    knobs20.plainWords20(sheet.doctrine20)
+  else:
+    knobs26.plainWords(sheet.doctrine)
diff --git a/src/battlecode/sheet_common.nim b/src/battlecode/sheet_common.nim
new file mode 100644
index 0000000..bbe2ab8
--- /dev/null
+++ b/src/battlecode/sheet_common.nim
@@ -0,0 +1,92 @@
+## Year-neutral doctrine-sheet plumbing, extracted UNCHANGED from `sheet.nim`
+## when the second year module landed.
+##
+## `normalizeKey`, `readNumber`, `readBool` and `extractJsonObject` are the
+## tolerant-parsing primitives every year's knob table repairs values with;
+## the rune and byte caps and `sanitizeLine` live in `sim_types` and are
+## re-exported here so a `years/<year>/knobs.nim` needs exactly one import.
+##
+## Nothing here knows what a knob is. A year's knob table lives in
+## `years/<year>/knobs.nim`, and `sheet.nim` is the envelope that dispatches
+## into it.
+
+import std/[json, strutils]
+import sim_types
+
+export sim_types
+
+proc normalizeKey*(text: string): string =
+  text.strip().toLowerAscii().replace("-", "_").replace(" ", "_")
+
+proc enumFromText*[T: enum](text: string, fallback: T): T =
+  let key = normalizeKey(text)
+  for value in T:
+    if normalizeKey($value) == key:
+      return value
+  fallback
+
+proc readNumber*(node: JsonNode): tuple[ok: bool, value: float] =
+  ## An int, a float, or a numeric string. Anything non-finite reports
+  ## `ok = false` so the caller applies the field's default rather than
+  ## inventing a value.
+  if node.isNil: return (false, 0.0)
+  case node.kind
+  of JInt: (true, float(node.getBiggestInt()))
+  of JFloat:
+    let f = node.getFloat()
+    if f != f or f > 1.0e9 or f < -1.0e9: (false, 0.0) else: (true, f)
+  of JString:
+    try: (true, parseFloat(node.getStr().strip()))
+    except CatchableError: (false, 0.0)
+  of JBool: (true, (if node.getBool(): 1.0 else: 0.0))
+  else: (false, 0.0)
+
+proc readBool*(node: JsonNode): tuple[ok: bool, value: bool] =
+  if node.isNil: return (false, false)
+  case node.kind
+  of JBool: (true, node.getBool())
+  of JInt: (true, node.getBiggestInt() != 0)
+  of JString:
+    case normalizeKey(node.getStr())
+    of "true", "yes", "1", "on": (true, true)
+    of "false", "no", "0", "off": (true, false)
+    else: (false, false)
+  else: (false, false)
+
+proc extractJsonObject*(text: string): JsonNode =
+  ## The outermost balanced `{...}` in a model reply, tolerating markdown
+  ## fences and any prose around it. Falls back to first-brace..last-brace,
+  ## which recovers a reply whose braces sit inside a quoted string.
+  var
+    depth = 0
+    start = -1
+    inString = false
+    escaped = false
+  for i, ch in text:
+    if inString:
+      if escaped: escaped = false
+      elif ch == '\\': escaped = true
+      elif ch == '"': inString = false
+      continue
+    case ch
+    of '"': inString = true
+    of '{':
+      if depth == 0: start = i
+      inc depth
+    of '}':
+      if depth > 0:
+        dec depth
+        if depth == 0 and start >= 0:
+          try:
+            return parseJson(text[start .. i])
+          except CatchableError:
+            start = -1
+    else: discard
+  let
+    first = text.find('{')
+    last = text.rfind('}')
+  if first < 0 or last <= first:
+    raise newException(BattlecodeError,
+      "no JSON object in reply: " & text.strip().truncateRunes(160).
+        replace("\n", " "))
+  parseJson(text[first .. last])
diff --git a/src/battlecode/years/bc20/blockchain.nim b/src/battlecode/years/bc20/blockchain.nim
new file mode 100644
index 0000000..c216e00
--- /dev/null
+++ b/src/battlecode/years/bc20/blockchain.nim
@@ -0,0 +1,62 @@
+## The 2020 blockchain: the transaction pool, `Transaction.compareTo`, and the
+## per-round mint of at most `NUMBER_OF_TRANSACTIONS_PER_BLOCK = 7`.
+##
+## Pure: no world state, so `world.nim` can import it. The world owns the pool
+## and the minted chain; this module owns the record and the ORDER.
+##
+## `common/Transaction.java`:
+##
+##     if (other.cost != this.cost) return other.cost - this.cost;   // higher cost first
+##     if (other.id   != this.id)   return other.id   - this.id;     // higher id first
+##     return serializedMessage.compareTo(other.serializedMessage);  // lexicographically earlier first
+##
+## and the serialized message is the seven ints rendered with
+## `Integer.toString` and joined by `_`.
+##
+## The engine drains a `PriorityQueue` with `poll()`; a full tie in all three
+## keys is the one case a binary heap and a sorted extraction can disagree on,
+## and it needs two transactions with the same cost, the same 32-bit random id
+## and the same seven ints. A stable sort is used here so the order is total
+## and deterministic (docs/RULES-BC20.md §Divergences).
+
+import std/[algorithm, strutils]
+
+const TransactionLength* = 7
+
+type
+  Transaction* = object
+    cost*: int
+    message*: array[TransactionLength, int]
+    id*: int32
+    serialized*: string
+    team*: int          ## 0 = A, 1 = B; `transactionToTeam` in the engine
+
+proc serializeMessage*(message: array[TransactionLength, int]): string =
+  var parts: seq[string]
+  for v in message:
+    parts.add($int32(v))
+  parts.join("_")
+
+proc newTransaction*(cost: int, message: array[TransactionLength, int],
+                     id: int32, team: int): Transaction =
+  Transaction(cost: cost, message: message, id: id,
+              serialized: serializeMessage(message), team: team)
+
+proc compareTransactions*(a, b: Transaction): int =
+  ## Sorts the pool into MINTING order: `a` before `b` when `a.compareTo(b) < 0`.
+  if a.cost != b.cost:
+    return b.cost - a.cost
+  if a.id != b.id:
+    return (if b.id > a.id: 1 else: -1)
+  cmp(a.serialized, b.serialized)
+
+proc mintBlock*(pool: var seq[Transaction], perBlock: int): seq[Transaction] =
+  ## Drains up to `perBlock` transactions in comparator order. Everything that
+  ## did not make the cut STAYS IN THE POOL and remains eligible for ever.
+  if pool.len == 0:
+    return @[]
+  pool.sort(compareTransactions)
+  let take = min(perBlock, pool.len)
+  result = pool[0 ..< take]
+  for _ in 0 ..< take:
+    pool.delete(0)
diff --git a/src/battlecode/years/bc20/chassis/boc.nim b/src/battlecode/years/bc20/chassis/boc.nim
new file mode 100644
index 0000000..6e1b7ee
--- /dev/null
+++ b/src/battlecode/years/bc20/chassis/boc.nim
@@ -0,0 +1,59 @@
+## `bowl-of-chowder` — the strong bc20 baseline and the champion chassis.
+##
+## Behaviour ported from `StoneT2000/Battlecode2020` `src/FinalChowBotStable/`
+## (AGPL-3.0; see NOTICE), parameterised by the ten doctrine knobs. None of its
+## Java is copied, compiled or shipped: the passive-lattice build order, the
+## wall-then-terraform landscaper priority, the builder-miner election, the
+## drone roles and the signal-code discipline are its IDEAS, rewritten in Nim.
+##
+## This file is only the dispatcher; the roles live one per module, exactly as
+## the design note lays them out.
+
+import kit, hq, miner, designschool, landscaper, fulfillment, drone, netgun
+
+export kit
+
+proc openingPlan*(side: Side): string =
+  ## The build order and role split for the first 400 rounds, in one word —
+  ## read by the endcard and by `tests/test_bc20_knobs.nim`.
+  case side.doctrine.opening
+  of opRush: "rush"
+  of opLattice: "lattice"
+  of opPassiveLattice: "passive_lattice"
+  of opTurtle: "turtle"
+
+proc applyOpening*(side: Side) =
+  ## `opening` is a preset over the other knobs, applied ONCE when the side is
+  ## created. Every knob the cog set explicitly still wins where it is more
+  ## specific; the preset only moves the pacing the opening is named for.
+  case side.doctrine.opening
+  of opRush:
+    ## Get there before their wall does: terraform late, lattice small.
+    side.doctrine.terraformStartRound =
+      max(side.doctrine.terraformStartRound, 500)
+    if side.doctrine.rushTrigger == 0:
+      side.doctrine.rushTrigger = 250
+  of opLattice:
+    ## Contest the middle while terraforming outward.
+    side.doctrine.terraformStartRound =
+      min(side.doctrine.terraformStartRound, 260)
+  of opPassiveLattice:
+    discard                     ## the defaults ARE the Bowl of Chowder build
+  of opTurtle:
+    ## Wall immediately, minimum miners, maximum net guns.
+    side.doctrine.wallHqRound =
+      (if side.doctrine.wallHqRound == 0: 0
+       else: min(side.doctrine.wallHqRound, 120))
+    side.doctrine.netGunRing = max(side.doctrine.netGunRing, 4)
+    side.doctrine.latticeRadius = min(side.doctrine.latticeRadius, 4)
+
+proc runBowlOfChowder*(w: World, side: Side, r: Robot) =
+  case r.kind
+  of rtHq: w.runHq(side, r)
+  of rtMiner: w.runMiner(side, r)
+  of rtDesignSchool: w.runDesignSchool(side, r)
+  of rtLandscaper: w.runLandscaper(side, r)
+  of rtFulfillmentCenter: w.runFulfillmentCenter(side, r)
+  of rtDeliveryDrone: w.runDrone(side, r)
+  of rtNetGun: w.runNetGun(side, r)
+  of rtRefinery, rtVaporator, rtCow: discard
diff --git a/src/battlecode/years/bc20/chassis/designschool.nim b/src/battlecode/years/bc20/chassis/designschool.nim
new file mode 100644
index 0000000..112adc8
--- /dev/null
+++ b/src/battlecode/years/bc20/chassis/designschool.nim
@@ -0,0 +1,29 @@
+## The Design School: build a Landscaper whenever the roster is under the
+## `landscaper_count_curve` target and the pool can pay for one, preferring a
+## direction on the HQ side so a new landscaper starts where the wall is.
+##
+## Behaviour, not code, from `StoneT2000/Battlecode2020` (AGPL-3.0; see NOTICE).
+
+import kit
+
+proc runDesignSchool*(w: World, side: Side, r: Robot) =
+  let brain = side.brainFor(r)
+  brain.turnCount += 1
+  if not isReady(r): return
+  if w.alive(side, rtLandscaper) >=
+      side.doctrine.landscaperTarget(w.currentRound): return
+  if w.stats.soup[ord(side.team)] < RobotSpecs[rtLandscaper].cost: return
+  var bestDir = dCenter
+  var bestScore = high(int)
+  for d in MoveDirs:
+    if not r.spend(1): break
+    if not w.canBuildRobot(r, rtLandscaper, d): continue
+    let candidate = r.loc + d
+    var score = if side.hasHq: chebyshev(candidate, side.hqLoc) else: 0
+    if w.willFloodNextRound(candidate): score += 100
+    if score < bestScore:
+      bestScore = score
+      bestDir = d
+  if bestDir == dCenter: return
+  if w.buildRobot(r, rtLandscaper, bestDir) >= 0:
+    w.firstBuild(side, rtLandscaper)
diff --git a/src/battlecode/years/bc20/chassis/drone.nim b/src/battlecode/years/bc20/chassis/drone.nim
new file mode 100644
index 0000000..fbf145c
--- /dev/null
+++ b/src/battlecode/years/bc20/chassis/drone.nim
@@ -0,0 +1,210 @@
+## The Delivery Drone: four roles, selected by the `drone_role` knob.
+##
+##   harass             hunt enemy units inside `r² <= 3` and drop them on the
+##                      nearest flooded tile
+##   wall               hold a ring at Chebyshev 4 from the enemy HQ, blocking
+##                      ground movement
+##   buster             hunt enemy drones sitting in a wall by baiting them
+##                      over our own net guns, and ferry a landscaper to the
+##                      enemy HQ
+##   carry_landscapers  ferry our own landscapers over impassable elevation
+##                      onto the lattice
+##
+## Every role avoids tiles within `r² <= 15` of a known enemy Net Gun or enemy
+## HQ unless it is carrying a landscaper to the enemy HQ, and a carried unit is
+## always dropped on the nearest flooded tile that is not adjacent to a
+## friendly building.
+##
+## Behaviour, not code, from `StoneT2000/Battlecode2020` (AGPL-3.0; see NOTICE).
+
+import kit, pathing, signals
+
+proc underGunFire(w: World, side: Side, r: Robot, l: Loc): bool =
+  ## A cheap, bounded threat test: the drone only knows about guns it can see.
+  for seen in w.sensed(r):
+    let occupant = w.getRobot(seen)
+    if occupant == nil: continue
+    if occupant.team == side.team or occupant.team == teamNeutral: continue
+    if occupant.kind notin {rtNetGun, rtHq}: continue
+    if l.distanceSquaredTo(seen) <= NetGunShootRadiusSquared: return true
+  false
+
+proc nearestWaterTile(w: World, side: Side, r: Robot): (bool, Loc) =
+  var best = loc(0, 0)
+  var bestD = high(int)
+  var found = false
+  for l in w.sensed(r):
+    if not w.isFlooded(l): continue
+    if w.isLocationOccupied(l): continue
+    if side.hasHq and chebyshev(l, side.hqLoc) <= 2: continue
+    let d = r.loc.distanceSquaredTo(l)
+    if d < bestD:
+      bestD = d
+      best = l
+      found = true
+  (found, best)
+
+proc pickupTarget(w: World, side: Side, r: Robot,
+                  wantOwn: bool): (bool, int, Loc) =
+  var bestId = -1
+  var bestLoc = loc(0, 0)
+  var bestD = high(int)
+  for l in w.locationsWithinRadiusSquared(r.loc,
+      DeliveryDronePickupRadiusSquared):
+    if not r.spend(1): break
+    let target = w.getRobot(l)
+    if target == nil: continue
+    if not target.kind.canBePickedUp(): continue
+    if target.blocked: continue
+    let mine = target.team == side.team
+    if wantOwn:
+      if not mine or target.kind != rtLandscaper: continue
+    else:
+      if mine or target.team == teamNeutral: continue
+    let d = r.loc.distanceSquaredTo(l)
+    if d < bestD:
+      bestD = d
+      bestId = target.id
+      bestLoc = l
+  (bestId >= 0, bestId, bestLoc)
+
+proc dropCargo(w: World, side: Side, r: Robot, intoWater: bool): bool =
+  if not r.holdingUnit: return false
+  if intoWater:
+    for d in MoveDirs:
+      if not r.spend(1): break
+      let l = r.loc + d
+      if not w.isFlooded(l): continue
+      if not w.canDropUnit(r, d): continue
+      w.dropUnit(r, d)
+      return true
+    return false
+  for d in MoveDirs:
+    if not r.spend(1): break
+    let l = r.loc + d
+    if w.isFlooded(l): continue
+    if not w.canDropUnit(r, d): continue
+    w.dropUnit(r, d)
+    return true
+  false
+
+proc huntEnemies(w: World, side: Side, r: Robot): bool =
+  ## Look for something to lift anywhere in sight and close on it; the pickup
+  ## itself only fires inside `r² <= 3`.
+  var best = loc(0, 0)
+  var bestD = high(int)
+  var found = false
+  for l in w.sensed(r):
+    let target = w.getRobot(l)
+    if target == nil: continue
+    if target.team == side.team or target.team == teamNeutral: continue
+    if not target.kind.canBePickedUp(): continue
+    if target.blocked: continue
+    let d = r.loc.distanceSquaredTo(l)
+    if d < bestD:
+      bestD = d
+      best = l
+      found = true
+  if not found: return false
+  w.stepToward(side, r, best)
+
+proc runHarass(w: World, side: Side, r: Robot) =
+  if r.holdingUnit:
+    let (haveWater, water) = w.nearestWaterTile(side, r)
+    if haveWater and r.loc.isAdjacentTo(water):
+      if w.dropCargo(side, r, intoWater = true): return
+    if haveWater:
+      w.stepToward(side, r, water)
+      return
+    if side.hasEnemyHq:
+      w.stepToward(side, r, side.enemyHqLoc)
+    return
+  let (havePickup, id, _) = w.pickupTarget(side, r, wantOwn = false)
+  if havePickup and w.canPickUpUnit(r, id):
+    w.pickUpUnit(r, id)
+    return
+  if w.huntEnemies(side, r): return
+  if side.hasEnemyHq and not w.underGunFire(side, r, r.loc):
+    w.stepToward(side, r, side.enemyHqLoc)
+
+proc runWallRole(w: World, side: Side, r: Robot) =
+  ## A ring at Chebyshev 4 from the enemy HQ. The station is a pure function of
+  ## the robot id, so the ring fills evenly without any signalling.
+  if not side.hasEnemyHq:
+    w.runHarass(side, r)
+    return
+  if r.holdingUnit:
+    discard w.dropCargo(side, r, intoWater = true)
+    return
+  let slot = r.id mod 8
+  let d = MoveDirs[slot]
+  let station = loc(side.enemyHqLoc.x + d.dx * 4, side.enemyHqLoc.y + d.dy * 4)
+  if r.loc == station:
+    let (havePickup, id, _) = w.pickupTarget(side, r, wantOwn = false)
+    if havePickup and w.canPickUpUnit(r, id):
+      w.pickUpUnit(r, id)
+    return
+  if not w.onTheMap(station):
+    w.runHarass(side, r)
+    return
+  w.stepToward(side, r, station)
+
+proc runBuster(w: World, side: Side, r: Robot) =
+  ## Ferry a landscaper to the enemy HQ, and bait enemy drones back over our
+  ## own guns when we are empty.
+  if r.holdingUnit:
+    if side.hasEnemyHq and chebyshev(r.loc, side.enemyHqLoc) <= 2:
+      if w.dropCargo(side, r, intoWater = false): return
+    if side.hasEnemyHq:
+      w.stepToward(side, r, side.enemyHqLoc)
+      return
+    discard w.dropCargo(side, r, intoWater = false)
+    return
+  let (haveOwn, ownId, _) = w.pickupTarget(side, r, wantOwn = true)
+  if haveOwn and w.canPickUpUnit(r, ownId):
+    w.pickUpUnit(r, ownId)
+    return
+  let (haveEnemy, enemyId, _) = w.pickupTarget(side, r, wantOwn = false)
+  if haveEnemy and w.canPickUpUnit(r, enemyId):
+    w.pickUpUnit(r, enemyId)
+    return
+  if side.hasHq and w.underGunFire(side, r, r.loc):
+    ## Bait: fall back over our own guns rather than trade with theirs.
+    w.stepToward(side, r, side.hqLoc)
+    return
+  if side.hasHq and w.alive(side, rtLandscaper) > 0:
+    w.stepToward(side, r, side.hqLoc)
+
+proc runCarryLandscapers(w: World, side: Side, r: Robot) =
+  if r.holdingUnit:
+    if side.hasHq and chebyshev(r.loc, side.hqLoc) <=
+        side.doctrine.latticeRadius:
+      if w.dropCargo(side, r, intoWater = false): return
+    if side.hasHq:
+      w.stepToward(side, r, side.hqLoc)
+      return
+    discard w.dropCargo(side, r, intoWater = false)
+    return
+  let (haveOwn, ownId, at) = w.pickupTarget(side, r, wantOwn = true)
+  if haveOwn and w.canPickUpUnit(r, ownId):
+    ## Only ferry a landscaper that is actually stuck — one standing outside
+    ## the lattice or on ground the flood takes next round.
+    let stuck = w.willFloodNextRound(at) or
+      (side.hasHq and chebyshev(at, side.hqLoc) > side.doctrine.latticeRadius)
+    if stuck:
+      w.pickUpUnit(r, ownId)
+      return
+  if side.hasHq:
+    w.stepToward(side, r, side.hqLoc)
+
+proc runDrone*(w: World, side: Side, r: Robot) =
+  let brain = side.brainFor(r)
+  brain.turnCount += 1
+  w.readBlocks(side, r)
+  w.noteEnemyHq(side)
+  if not isReady(r): return
+  case side.doctrine.droneRole
+  of drHarass: w.runHarass(side, r)
+  of drWall: w.runWallRole(side, r)
+  of drBuster: w.runBuster(side, r)
+  of drCarryLandscapers: w.runCarryLandscapers(side, r)
diff --git a/src/battlecode/years/bc20/chassis/fulfillment.nim b/src/battlecode/years/bc20/chassis/fulfillment.nim
new file mode 100644
index 0000000..46ca5d5
--- /dev/null
+++ b/src/battlecode/years/bc20/chassis/fulfillment.nim
@@ -0,0 +1,22 @@
+## The Fulfillment Center: build a Delivery Drone whenever the roster is under
+## `4 + round/300` (capped 14) and the pool can pay, and always when
+## `NEED_DRONES` is on the chain.
+##
+## Behaviour, not code, from `StoneT2000/Battlecode2020` (AGPL-3.0; see NOTICE).
+
+import kit
+
+proc droneTarget*(round: int): int = min(14, 4 + round div 300)
+
+proc runFulfillmentCenter*(w: World, side: Side, r: Robot) =
+  let brain = side.brainFor(r)
+  brain.turnCount += 1
+  if not isReady(r): return
+  if w.alive(side, rtDeliveryDrone) >= droneTarget(w.currentRound): return
+  if w.stats.soup[ord(side.team)] < RobotSpecs[rtDeliveryDrone].cost: return
+  for d in MoveDirs:
+    if not r.spend(1): break
+    if not w.canBuildRobot(r, rtDeliveryDrone, d): continue
+    if w.buildRobot(r, rtDeliveryDrone, d) >= 0:
+      w.firstBuild(side, rtDeliveryDrone)
+    return
diff --git a/src/battlecode/years/bc20/chassis/hq.nim b/src/battlecode/years/bc20/chassis/hq.nim
new file mode 100644
index 0000000..c3293d5
--- /dev/null
+++ b/src/battlecode/years/bc20/chassis/hq.nim
@@ -0,0 +1,91 @@
+## The HQ: build miners on the curve, shoot drones, and open the round-1
+## broadcast.
+##
+## Behaviour, not code, from `StoneT2000/Battlecode2020` (AGPL-3.0; see NOTICE).
+
+import kit, signals
+
+proc bestBuildDir(w: World, side: Side, r: Robot, kind: RobotKind): Dir =
+  ## Prefer the direction AWAY from the nearest flooded tile, so a fresh miner
+  ## is not spawned onto ground the water takes next.
+  var bestDir = dCenter
+  var bestScore = low(int)
+  for d in MoveDirs:
+    if not r.spend(1): break
+    if not w.canBuildRobot(r, kind, d): continue
+    let candidate = r.loc + d
+    var score = w.getDirt(candidate) * 4
+    if w.willFloodNextRound(candidate): score -= 100
+    if side.hasEnemyHq:
+      ## Miners come out on the side facing the map, not into a corner.
+      score -= chebyshev(candidate, side.enemyHqLoc) div 8
+    if score > bestScore:
+      bestScore = score
+      bestDir = d
+  bestDir
+
+proc shootNearestDrone*(w: World, side: Side, r: Robot): bool
+    {.discardable.} =
+  ## Both the HQ and a net gun have this; the HQ runs it BEFORE building.
+  if not isReady(r): return false
+  var bestId = -1
+  var bestD = high(int)
+  var bestCarrying = false
+  for l in w.locationsWithinRadiusSquared(r.loc, NetGunShootRadiusSquared):
+    if not r.spend(1): break
+    let target = w.getRobot(l)
+    if target == nil: continue
+    if target.kind != rtDeliveryDrone: continue
+    if target.team == r.team or target.team == teamNeutral: continue
+    let d = r.loc.distanceSquaredTo(l)
+    ## A drone that is CARRYING something is the one to take down first: the
+    ## unit it is holding dies with it if it is over water.
+    if (target.holdingUnit and not bestCarrying) or
+        (target.holdingUnit == bestCarrying and d < bestD):
+      bestD = d
+      bestId = target.id
+      bestCarrying = target.holdingUnit
+  if bestId < 0: return false
+  if not w.canShootUnit(r, bestId): return false
+  w.shootUnit(r, bestId)
+  true
+
+proc runHq*(w: World, side: Side, r: Robot) =
+  let brain = side.brainFor(r)
+  brain.turnCount += 1
+  w.noteHq(side)
+  w.noteEnemyHq(side)
+
+  if brain.turnCount == 1:
+    w.broadcast(side, r, SigHqLocation, r.loc.x, r.loc.y)
+  if side.doctrine.wallHqRound > 0 and
+      w.currentRound == w.effectiveWallRound(side):
+    w.broadcast(side, r, SigWallIn, r.loc.x, r.loc.y)
+  if side.doctrine.rushTrigger > 0 and
+      w.currentRound == side.doctrine.rushTrigger:
+    w.broadcast(side, r, SigRushNow, side.enemyHqLoc.x, side.enemyHqLoc.y)
+
+  ## A half-buried HQ shouts about it and stops spending.
+  if r.dirtCarrying >= RobotSpecs[rtHq].dirtLimit div 2:
+    w.broadcast(side, r, SigHqUnderAttack, r.dirtCarrying)
+    discard w.shootNearestDrone(side, r)
+    return
+
+  discard w.shootNearestDrone(side, r)
+  if not isReady(r): return
+  if w.alive(side, rtMiner) >= side.doctrine.minerTarget(w.currentRound):
+    return
+  ## RESERVE for the first Design School. Six miners at 70 is 420 soup and the
+  ## pool starts at 200, so an HQ that spends every credit on miners never lets
+  ## the builder afford a school — and a team with no landscapers cannot wall,
+  ## and an HQ that cannot wall drowns on the schedule. Three miners is enough
+  ## to earn the 150 back.
+  let reserve =
+    if w.alive(side, rtDesignSchool) < 1 and w.alive(side, rtMiner) >= 3:
+      RobotSpecs[rtDesignSchool].cost
+    else: 0
+  if w.stats.soup[ord(side.team)] < RobotSpecs[rtMiner].cost + reserve: return
+  let d = w.bestBuildDir(side, r, rtMiner)
+  if d == dCenter: return
+  if w.buildRobot(r, rtMiner, d) >= 0:
+    w.firstBuild(side, rtMiner)
diff --git a/src/battlecode/years/bc20/chassis/kit.nim b/src/battlecode/years/bc20/chassis/kit.nim
new file mode 100644
index 0000000..1f3ca2f
--- /dev/null
+++ b/src/battlecode/years/bc20/chassis/kit.nim
@@ -0,0 +1,170 @@
+## Shared bc20 chassis scaffolding: the team's doctrine, per-robot memory, and
+## the DECISION BUDGET that replaces the engine's JVM bytecode limit.
+##
+## The engine meters a robot's turn in bytecodes through an instrumenting class
+## loader. There is no JVM here, so every primitive step a bot takes — a tile
+## sensed, a robot examined, a BFS node expanded, a direction evaluated, a
+## block read — is charged against `Robot.opsLeft` instead, and the robot ends
+## its turn WHERE IT STANDS when the budget runs out (no mid-turn resumption).
+## Bounded, machine-independent, deterministic, and a deliberate divergence
+## (docs/RULES-BC20.md §Divergences).
+##
+## The budget is ENFORCED BY THE SIM, not by the bot: every loop below runs
+## through `spend`, and `tests/test_bc20_baselines.nim` asserts that no robot
+## ever exceeds it.
+
+import std/tables
+import ../../../rng
+import ../knobs, ../world, ../flood
+
+export knobs, world, flood, rng, tables
+
+type
+  Brain* = ref object
+    ## One robot's private memory, keyed by robot id so it follows the robot
+    ## for its whole life. In Battlecode each robot gets its own class loader,
+    ## so a bot's `static` fields are per robot — reproduced here.
+    rng*: JavaRandom
+    turnCount*: int
+    role*: int              ## per-unit role slot (wall index, drone station…)
+    hasRole*: bool
+    hasTarget*: bool
+    target*: Loc
+    hasSoupTip*: bool
+    soupTip*: Loc
+    announcedSoup*: bool
+    mode*: int              ## landscaper: 0 wall, 1 terraform, 2 attack
+    history*: seq[Loc]      ## the 6-tile no-repeat window that breaks oscillation
+
+  Side* = ref object
+    team*: Team
+    doctrine*: Doctrine20
+    brains*: Table[int, Brain]
+    hqLoc*: Loc
+    hasHq*: bool
+    enemyHqLoc*: Loc
+    hasEnemyHq*: bool
+    builderId*: int
+    wallClosed*: bool
+    wallClosedRound*: int
+    rushLaunched*: bool
+    rushUnits*: int
+    soupTips*: seq[Loc]
+    firstBuilt*: array[RobotKind, bool]
+    nextBlockToRead*: int
+    wallRoundCache*: int
+
+proc newSide*(team: Team, doctrine: Doctrine20): Side =
+  Side(team: team, doctrine: doctrine, brains: initTable[int, Brain](),
+       builderId: -1, wallClosedRound: -1, nextBlockToRead: 1,
+       wallRoundCache: -1)
+
+proc brainFor*(side: Side, r: Robot): Brain =
+  if r.id notin side.brains:
+    ## Seeded from the robot id, so a robot's private stream is a pure
+    ## function of the map seed (which decides ids) and nothing else.
+    side.brains[r.id] = Brain(rng: initJavaRandom(r.id))
+  side.brains[r.id]
+
+proc spend*(r: Robot, ops: int): bool {.discardable.} =
+  ## Charge `ops` decision credits. False once the robot is out of budget;
+  ## every loop in the chassis checks it and stops.
+  if r.opsLeft <= 0: return false
+  r.opsLeft -= ops
+  r.opsLeft > 0
+
+func other*(team: Team): Team =
+  if team == teamA: teamB else: teamA
+
+func alive*(w: World, side: Side, kind: RobotKind): int =
+  w.typeCount[ord(side.team)][kind]
+
+proc ownHq*(w: World, side: Side): Robot =
+  let id = w.hqId[ord(side.team)]
+  if id >= 0 and id in w.robotsById: w.robotsById[id] else: nil
+
+proc noteHq*(w: World, side: Side) =
+  let hq = w.ownHq(side)
+  if hq != nil:
+    side.hqLoc = hq.loc
+    side.hasHq = true
+
+proc symmetricLoc*(w: World, l: Loc): Loc =
+  ## The map is symmetric, so the enemy HQ is at the mirror of ours. The
+  ## chassis uses the symmetry the SIM recomputed, never the map file's.
+  case w.symmetry
+  of symVertical: loc(w.width - 1 - l.x, l.y)
+  of symHorizontal: loc(l.x, w.height - 1 - l.y)
+  of symRotational: loc(w.width - 1 - l.x, w.height - 1 - l.y)
+
+proc noteEnemyHq*(w: World, side: Side) =
+  if side.hasEnemyHq: return
+  if not side.hasHq: return
+  side.enemyHqLoc = w.symmetricLoc(side.hqLoc)
+  side.hasEnemyHq = true
+
+proc wallTarget*(w: World, side: Side): int =
+  ## `landscaper.nim` mode (a): the bar every one of the 8 tiles adjacent to
+  ## the own HQ must clear. The note's `waterLevel(round + 400) + 2` is a
+  ## MOVING bar, and a moving bar declares the wall closed at round 76 on a map
+  ## whose ring already sits at elevation 4 and then lets the same ring drown
+  ## at round 932. The bar used here is the same expression evaluated at the
+  ## LAST round the game can reach, so a wall is built once, to a height the
+  ## water never gets to, and stays closed.
+  int(waterLevelAt(min(WaterTableMaxRound,
+                       max(w.currentRound + 400, w.maxRounds)))) + 2
+
+proc ringTiles*(w: World, centre: Loc): seq[Loc] =
+  for d in MoveDirs:
+    let l = centre + d
+    if w.onTheMap(l): result.add(l)
+
+proc effectiveWallRound*(w: World, side: Side): int =
+  ## `wall_hq_round` says WHEN to start walling; the map says when it is too
+  ## late. An HQ is a building, so dirt dropped on its tile buries it rather
+  ## than raising it: the only thing that keeps an HQ dry is a ring of eight
+  ## tiles the water can never cross. On a low map (`maptestsmall`'s ring sits
+  ## at elevation 1 and floods at round 256) a doctrine that says "wall at 300"
+  ## has already lost, so the chassis starts 200 rounds before the ring's own
+  ## flood round when that is EARLIER than the knob.
+  ##
+  ## `wall_hq_round = 0` still means NEVER, which is what gives the knob its
+  ## teeth: never walling drowns the HQ, exactly as the sheet documents.
+  if side.doctrine.wallHqRound == 0: return 0
+  if side.wallRoundCache >= 0: return side.wallRoundCache
+  if not side.hasHq: return side.doctrine.wallHqRound
+  var minElev = high(int)
+  for l in w.ringTiles(side.hqLoc):
+    minElev = min(minElev, w.map.elevation[w.idx(l)])
+  if minElev == high(int) or minElev < 0:
+    side.wallRoundCache = side.doctrine.wallHqRound
+  else:
+    side.wallRoundCache = min(side.doctrine.wallHqRound,
+      max(1, roundWaterReaches(minElev) - 200))
+  side.wallRoundCache
+
+proc latticeTarget*(side: Side, round: int): int =
+  ## `lattice.nim`: every non-wall tile inside `lattice_radius` is raised to
+  ## `waterLevel(round + 250) + 1`.
+  int(waterLevelAt(min(WaterTableMaxRound, round + 250))) + 1
+
+proc willFloodNextRound*(w: World, l: Loc): bool =
+  ## A tile a ground unit must not be standing on when the flood arrives.
+  if not w.onTheMap(l): return false
+  if w.isFlooded(l): return true
+  float32(w.getDirt(l)) < waterLevelAt(w.currentRound + 1)
+
+iterator sensed*(w: World, r: Robot): Loc =
+  ## Every tile this robot can see this turn, charged one credit each.
+  let r2 = w.currentSensorRadiusSquared(r)
+  for l in w.locationsWithinRadiusSquared(r.loc, r2):
+    if r.opsLeft <= 0: break
+    r.opsLeft -= 1
+    yield l
+
+proc firstBuild*(w: World, side: Side, kind: RobotKind) =
+  ## `first_build` is emitted once per team per unit kind — the beat the
+  ## scrubber draws.
+  if side.firstBuilt[kind]: return
+  side.firstBuilt[kind] = true
+  w.emit("first_build", ord(side.team), ord(kind), w.currentRound)
diff --git a/src/battlecode/years/bc20/chassis/landscaper.nim b/src/battlecode/years/bc20/chassis/landscaper.nim
new file mode 100644
index 0000000..541a90f
--- /dev/null
+++ b/src/battlecode/years/bc20/chassis/landscaper.nim
@@ -0,0 +1,217 @@
+## The landscaper: three modes, in priority order.
+##
+##  (a) WALL, from round `wall_hq_round`: claim one of the 8 tiles adjacent to
+##      the own HQ, stand ON it, and raise it under yourself to
+##      `waterLevel(round + 400) + 2` by digging from a tile OUTSIDE the ring.
+##      An HQ is a building, so dirt dropped on it BURIES it — the HQ's own
+##      tile can never be raised. The only way an HQ survives the flood is a
+##      ring of eight tiles the water can never cross, which is exactly what
+##      this mode builds. When every ring tile clears the bar the side emits
+##      `wall_closed` and the landscaper drops to (b).
+##  (b) TERRAFORM, from `terraform_start_round`: raise the lowest lattice tile
+##      inside `lattice_radius` that is below `waterLevel(round + 250) + 1`,
+##      keeping Bowl of Chowder's checkerboard parity so units can still path.
+##  (c) ATTACK: a landscaper delivered next to an enemy building digs its wall
+##      down and then buries it. 50 dirt kills an HQ; a landscaper carries 25.
+##
+## Any landscaper on a tile that floods next round MOVES FIRST and digs second.
+##
+## Behaviour, not code, from `StoneT2000/Battlecode2020` (AGPL-3.0; see NOTICE).
+
+import kit, pathing, signals, lattice
+
+const
+  ModeWall = 0
+  ModeTerraform = 1
+  ModeAttack = 2
+
+proc wallTileNeedsWork*(w: World, side: Side, l: Loc): bool =
+  let occupant = w.getRobot(l)
+  if occupant != nil and occupant.kind.isBuilding(): return false
+  w.getDirt(l) < w.wallTarget(side)
+
+proc wallComplete*(w: World, side: Side): bool =
+  if not side.hasHq: return false
+  for l in w.ringTiles(side.hqLoc):
+    if w.wallTileNeedsWork(side, l): return false
+  true
+
+proc minRingElevation*(w: World, side: Side): int =
+  if not side.hasHq: return 0
+  result = high(int)
+  for l in w.ringTiles(side.hqLoc):
+    result = min(result, w.getDirt(l))
+  if result == high(int): result = 0
+
+proc claimWallTile(w: World, side: Side, r: Robot): (bool, Loc) =
+  ## The ring tile this landscaper works on. A tile it is ALREADY STANDING ON
+  ## or standing NEXT TO wins outright, because a landscaper that has raised
+  ## its own tile to the bar is usually eight elevation steps above everything
+  ## around it and can no longer walk anywhere — but it is still adjacent to
+  ## the two neighbouring ring tiles, and it can deposit onto them from where
+  ## it stands. Preferring the globally lowest tile instead is what left three
+  ## ring tiles at elevation 3 while one landscaper piled 235 dirt onto its own.
+  if not side.hasHq: return (false, loc(0, 0))
+  var best = loc(0, 0)
+  var bestScore = high(int)
+  var found = false
+  for l in w.ringTiles(side.hqLoc):
+    if not r.spend(1): break
+    if not w.wallTileNeedsWork(side, l): continue
+    ## A ring tile with a UNIT standing on it is still claimable: dirt dropped
+    ## on a non-building goes onto the GROUND, so a miner in the way does not
+    ## stop the wall going up under it. Only a building blocks, and
+    ## `wallTileNeedsWork` has already excluded those.
+    let reach =
+      if r.loc == l: 0
+      elif r.loc.isAdjacentTo(l): 1
+      else: 2
+    let score = reach * 1_000_000 + w.getDirt(l) * 64 +
+      r.loc.distanceSquaredTo(l)
+    if score < bestScore:
+      bestScore = score
+      best = l
+      found = true
+  (found, best)
+
+proc depositToward(w: World, r: Robot, target: Loc): bool =
+  let d = fromDelta(target.x - r.loc.x, target.y - r.loc.y)
+  if not w.canDepositDirt(r, d): return false
+  w.depositDirt(r, d)
+  true
+
+proc digFrom(w: World, side: Side, r: Robot, protect: openArray[Loc]): bool =
+  let d = w.digSourceFor(side, r, protect)
+  if d == dCenter: return false
+  if not w.canDigDirt(r, d): return false
+  w.digDirt(r, d)
+  true
+
+proc runWallMode(w: World, side: Side, r: Robot): bool =
+  let (haveTile, tile) = w.claimWallTile(side, r)
+  if not haveTile: return false
+  if r.loc == tile:
+    if r.dirtCarrying > 0 and w.wallTileNeedsWork(side, tile):
+      return w.depositToward(r, r.loc)
+    var protect = w.ringTiles(side.hqLoc)
+    protect.add(side.hqLoc)
+    return w.digFrom(side, r, protect)
+  if r.loc.isAdjacentTo(tile):
+    ## Standing next to an unclaimed ring tile: raise it from here — this is
+    ## also how a FLOODED ring tile is resurfaced, since `addDirt` runs
+    ## `tryResurface` the moment the elevation clears the water.
+    if r.dirtCarrying > 0:
+      if w.depositToward(r, tile): return true
+    var protect = w.ringTiles(side.hqLoc)
+    protect.add(side.hqLoc)
+    if w.digFrom(side, r, protect): return true
+    ## Nothing to dig here — step on if we can.
+    return w.stepToward(side, r, tile)
+  w.stepToward(side, r, tile)
+
+proc runTerraformMode(w: World, side: Side, r: Robot): bool =
+  let (haveTile, tile) = w.lowestLatticeTileNear(side, r)
+  if not haveTile:
+    if side.hasHq and chebyshev(r.loc, side.hqLoc) > side.doctrine.latticeRadius:
+      return w.stepToward(side, r, side.hqLoc)
+    return false
+  if r.loc.isAdjacentTo(tile) or r.loc == tile:
+    if r.dirtCarrying > 0:
+      if w.depositToward(r, tile): return true
+    var protect = w.ringTiles(side.hqLoc)
+    protect.add(side.hqLoc)
+    protect.add(tile)
+    return w.digFrom(side, r, protect)
+  w.stepToward(side, r, tile)
+
+proc adjacentEnemyBuilding(w: World, side: Side, r: Robot): (bool, Loc) =
+  for d in MoveDirs:
+    if not r.spend(1): break
+    let l = r.loc + d
+    let occupant = w.getRobot(l)
+    if occupant == nil: continue
+    if occupant.team == side.team or occupant.team == teamNeutral: continue
+    if not occupant.kind.isBuilding(): continue
+    return (true, l)
+  (false, loc(0, 0))
+
+proc runAttackMode(w: World, side: Side, r: Robot): bool =
+  let (haveTarget, target) = w.adjacentEnemyBuilding(side, r)
+  if haveTarget:
+    if r.dirtCarrying > 0:
+      return w.depositToward(r, target)
+    ## Nothing carried: take dirt from the ground beside the enemy wall.
+    return w.digFrom(side, r, [target])
+  if not side.hasEnemyHq: return false
+  ## The enemy HQ's own ring is walled: dig it back down on the way in.
+  if chebyshev(r.loc, side.enemyHqLoc) <= 2 and r.dirtCarrying <
+      RobotSpecs[rtLandscaper].dirtLimit:
+    if w.digFrom(side, r, [side.enemyHqLoc]): return true
+  w.stepToward(side, r, side.enemyHqLoc)
+
+proc chooseMode(w: World, side: Side, r: Robot, brain: Brain): int =
+  let d = side.doctrine
+  if brain.mode == ModeAttack: return ModeAttack
+  let rushing =
+    d.rushTrigger > 0 and w.currentRound >= d.rushTrigger and side.hasEnemyHq
+  if rushing:
+    ## With `opening = rush` half the roster commits; with any other opening
+    ## the knob sends a SINGLE harassing landscaper (§Decisions).
+    let commit =
+      if d.opening == opRush: (r.id and 1) == 0
+      else: side.rushUnits == 0
+    if commit:
+      side.rushUnits += 1
+      if not side.rushLaunched:
+        side.rushLaunched = true
+        w.emit("rush_launched", ord(side.team), side.rushUnits, w.currentRound)
+      return ModeAttack
+  if d.wallHqRound > 0 and w.currentRound >= w.effectiveWallRound(side) and
+      not w.wallComplete(side):
+    return ModeWall
+  if w.currentRound >= d.terraformStartRound:
+    return ModeTerraform
+  if d.wallHqRound > 0 and not w.wallComplete(side):
+    return ModeWall
+  ModeTerraform
+
+proc runLandscaper*(w: World, side: Side, r: Robot) =
+  let brain = side.brainFor(r)
+  brain.turnCount += 1
+  w.readBlocks(side, r)
+  w.noteEnemyHq(side)
+  if w.fleeWater(side, r): return
+  if r.dead: return
+  if not isReady(r): return
+
+  let mode = w.chooseMode(side, r, brain)
+  brain.mode = mode
+  var acted = false
+  case mode
+  of ModeAttack: acted = w.runAttackMode(side, r)
+  of ModeWall: acted = w.runWallMode(side, r)
+  else: acted = w.runTerraformMode(side, r)
+  if r.dead: return
+
+  ## The wall is a team fact, so it is announced once, by whoever closes it.
+  if not side.wallClosed and side.doctrine.wallHqRound > 0 and
+      w.wallComplete(side):
+    side.wallClosed = true
+    side.wallClosedRound = w.currentRound
+    w.emit("wall_closed", ord(side.team), w.minRingElevation(side),
+      w.currentRound)
+    w.broadcast(side, r, SigWallClosed, w.minRingElevation(side))
+
+  if not acted and isReady(r) and mode != ModeAttack:
+    ## An idle landscaper tops up the tile it stands on — but ONLY up to the
+    ## bar. Without the cap a landscaper that had finished its wall tile and
+    ## could no longer walk anywhere (it is eight steps above its neighbours)
+    ## dug and dropped for the rest of the match and built a 235-high spike.
+    let cap = max(w.wallTarget(side), side.latticeTarget(w.currentRound))
+    if r.dirtCarrying > 0 and w.getDirt(r.loc) < cap:
+      discard w.depositToward(r, r.loc)
+    elif r.dirtCarrying < RobotSpecs[rtLandscaper].dirtLimit and
+        w.getDirt(r.loc) < cap:
+      var protect = w.ringTiles(side.hqLoc)
+      protect.add(side.hqLoc)
+      discard w.digFrom(side, r, protect)
diff --git a/src/battlecode/years/bc20/chassis/lattice.nim b/src/battlecode/years/bc20/chassis/lattice.nim
new file mode 100644
index 0000000..5700e08
--- /dev/null
+++ b/src/battlecode/years/bc20/chassis/lattice.nim
@@ -0,0 +1,71 @@
+## The lattice: which tiles inside `lattice_radius` of the own HQ are raised,
+## and to what height.
+##
+## Bowl of Chowder's checkerboard parity is kept: only tiles whose `(x + y)` is
+## EVEN are raised, so the odd tiles stay at ground level and units can always
+## path through a finished lattice instead of being walled in by their own
+## terraforming. The bar is `waterLevel(round + 250) + 1`, i.e. the lattice is
+## always being built for the flood a quarter of a game ahead.
+##
+## Behaviour, not code, from `StoneT2000/Battlecode2020` (AGPL-3.0; see NOTICE).
+
+import kit
+
+func isLatticeTile*(l: Loc): bool = ((l.x + l.y) and 1) == 0
+
+func isWallRing*(side: Side, l: Loc): bool =
+  side.hasHq and chebyshev(l, side.hqLoc) == 1
+
+proc latticeNeedsWork*(w: World, side: Side, l: Loc): bool =
+  if not side.hasHq: return false
+  if not l.isLatticeTile(): return false
+  if chebyshev(l, side.hqLoc) > side.doctrine.latticeRadius: return false
+  if l == side.hqLoc: return false
+  if side.isWallRing(l): return false
+  let occupant = w.getRobot(l)
+  if occupant != nil and occupant.kind.isBuilding(): return false
+  w.getDirt(l) < side.latticeTarget(w.currentRound)
+
+proc lowestLatticeTileNear*(w: World, side: Side, r: Robot): (bool, Loc) =
+  ## The lowest tile within the robot's own sense window that the lattice still
+  ## wants raised. Charged per tile examined.
+  var best = loc(0, 0)
+  var bestElev = high(int)
+  var found = false
+  for l in w.sensed(r):
+    if not w.latticeNeedsWork(side, l): continue
+    let e = w.getDirt(l)
+    if e < bestElev or (e == bestElev and found and
+        l.distanceSquaredTo(r.loc) < best.distanceSquaredTo(r.loc)):
+      bestElev = e
+      best = l
+      found = true
+  (found, best)
+
+proc digSourceFor*(w: World, side: Side, r: Robot,
+                   protect: openArray[Loc]): Dir =
+  ## A tile adjacent to the landscaper that dirt may be taken FROM: on the map,
+  ## never the HQ ring, never a lattice tile the plan wants raised, never a
+  ## building without dirt on it, and preferring the HIGHEST tile so the dig
+  ## does not open a new flood path.
+  var bestDir = dCenter
+  var bestElev = low(int)
+  for d in MoveDirs:
+    if not r.spend(1): break
+    let candidate = r.loc + d
+    if not w.onTheMap(candidate): continue
+    var skip = false
+    for p in protect:
+      if p == candidate: skip = true
+    if skip: continue
+    if side.isWallRing(candidate): continue
+    if w.latticeNeedsWork(side, candidate): continue
+    let occupant = w.getRobot(candidate)
+    if occupant != nil and occupant.kind.isBuilding() and
+        occupant.dirtCarrying <= 0: continue
+    if not w.canDigDirt(r, d): continue
+    let e = w.getDirt(candidate)
+    if e > bestElev:
+      bestElev = e
+      bestDir = d
+  bestDir
diff --git a/src/battlecode/years/bc20/chassis/miner.nim b/src/battlecode/years/bc20/chassis/miner.nim
new file mode 100644
index 0000000..52f4259
--- /dev/null
+++ b/src/battlecode/years/bc20/chassis/miner.nim
@@ -0,0 +1,195 @@
+## The miner: mine, refine, and — for the ONE elected builder — put up the
+## team's buildings in the doctrine's own order.
+##
+## The builder is the lowest-id living miner, so the election is stable, free
+## and needs no signalling. It builds, in this order and only when the team
+## pool can afford it without stalling miner production:
+##   1 Design School at Chebyshev 2 from the HQ, on the side away from the water
+##   `net_gun_ring` Net Guns, also at Chebyshev 2 (a net gun ON the HQ ring
+##       would be buried by our own wall — see docs/RULES-BC20.md)
+##   1 Fulfillment Center
+##   `vaporator_budget` Vaporators inside the lattice
+##   a second Design School after round 600
+##
+## Behaviour, not code, from `StoneT2000/Battlecode2020` (AGPL-3.0; see NOTICE).
+
+import kit, pathing, signals, lattice
+
+const
+  BuildReserve = 70          ## never spend the last miner out of the pool
+  SoupTipThreshold = 200
+
+proc electBuilder(w: World, side: Side) =
+  if side.builderId >= 0 and side.builderId in w.robotsById:
+    let existing = w.robotsById[side.builderId]
+    if existing.kind == rtMiner and existing.team == side.team:
+      return
+  var best = high(int)
+  for id, r in w.robotsById:
+    if r.team == side.team and r.kind == rtMiner and id < best:
+      best = id
+  side.builderId = if best == high(int): -1 else: best
+
+proc nextBuilding(w: World, side: Side): (bool, RobotKind) =
+  let d = side.doctrine
+  if w.alive(side, rtDesignSchool) < 1: return (true, rtDesignSchool)
+  if w.alive(side, rtNetGun) < d.netGunRing: return (true, rtNetGun)
+  if w.alive(side, rtFulfillmentCenter) < 1: return (true, rtFulfillmentCenter)
+  ## One Refinery once the near seam is worked out: a miner that has to walk
+  ## the whole way back to the HQ spends most of the match in transit, and a
+  ## starved pool is what stops the Design School making landscapers.
+  if w.currentRound >= 250 and w.alive(side, rtRefinery) < 1:
+    return (true, rtRefinery)
+  if w.alive(side, rtVaporator) < d.vaporatorBudget: return (true, rtVaporator)
+  if w.currentRound >= 600 and w.alive(side, rtDesignSchool) < 2:
+    return (true, rtDesignSchool)
+  (false, rtMiner)
+
+proc buildSiteScore(w: World, side: Side, kind: RobotKind, l: Loc): int =
+  ## Buildings go at Chebyshev 2 from the HQ: close enough to defend, far
+  ## enough that the HQ wall does not bury them.
+  if not side.hasHq: return low(int)
+  let ring = chebyshev(l, side.hqLoc)
+  if ring < 2: return low(int)
+  ## High ground first: a building cannot be raised (dirt dropped on a
+  ## building buries it), so the elevation it is founded on is the elevation it
+  ## drowns at.
+  var score = 100 - abs(ring - 2) * 20 + w.getDirt(l) * 12
+  if w.willFloodNextRound(l): score -= 500
+  if kind == rtVaporator and not l.isLatticeTile(): score -= 10
+  score
+
+proc tryBuild(w: World, side: Side, r: Robot, kind: RobotKind): bool =
+  ## The FIRST Design School is survival, not economy: it is bought with the
+  ## last credit in the pool. Everything after it leaves the miners a reserve.
+  let reserve =
+    if kind == rtDesignSchool and w.alive(side, rtDesignSchool) == 0: 0
+    else: BuildReserve
+  if w.stats.soup[ord(side.team)] < RobotSpecs[kind].cost + reserve:
+    return false
+  var bestDir = dCenter
+  var bestScore = low(int)
+  for d in MoveDirs:
+    if not r.spend(1): break
+    if not w.canBuildRobot(r, kind, d): continue
+    let score = w.buildSiteScore(side, kind, r.loc + d)
+    if score > bestScore:
+      bestScore = score
+      bestDir = d
+  if bestDir == dCenter or bestScore == low(int): return false
+  if w.buildRobot(r, kind, bestDir) < 0: return false
+  w.firstBuild(side, kind)
+  true
+
+proc nearestRefinery(w: World, r: Robot, side: Side): (bool, Loc) =
+  ## The HQ always refines; a refinery is a bonus. The HQ location is known
+  ## from the round-1 broadcast, so a miner never has to search for it.
+  var best = loc(0, 0)
+  var bestD = high(int)
+  var found = false
+  if side.hasHq:
+    best = side.hqLoc
+    bestD = r.loc.distanceSquaredTo(side.hqLoc)
+    found = true
+  for l in w.sensed(r):
+    let occupant = w.getRobot(l)
+    if occupant == nil: continue
+    if occupant.team != side.team: continue
+    if not occupant.kind.canRefine(): continue
+    let d = r.loc.distanceSquaredTo(l)
+    if d < bestD:
+      bestD = d
+      best = l
+      found = true
+  (found, best)
+
+proc nearestSoup(w: World, r: Robot, side: Side): (bool, Loc) =
+  var best = loc(0, 0)
+  var bestD = high(int)
+  var found = false
+  for l in w.sensed(r):
+    if w.getSoup(l) <= 0: continue
+    ## A FLOODED soup tile is still mineable: `assertCanMineSoup` checks only
+    ## that the tile is on the map and carries soup, and a miner mines from an
+    ## ADJACENT tile. Skipping flooded soup left the whole `WateredDown` seam
+    ## — every soup tile within ten of the HQ is under water there — invisible,
+    ## and a team that mines nothing builds nothing and drowns on schedule.
+    let d = r.loc.distanceSquaredTo(l)
+    if d < bestD:
+      bestD = d
+      best = l
+      found = true
+  if found: return (true, best)
+  ## Nothing in sight: the seam this miner worked last, then the chain.
+  let brain = side.brainFor(r)
+  if brain.hasSoupTip:
+    if w.getSoup(brain.soupTip) > 0:
+      return (true, brain.soupTip)
+    brain.hasSoupTip = false
+  for tip in side.soupTips:
+    if not r.spend(1): break
+    let d = r.loc.distanceSquaredTo(tip)
+    if d < bestD:
+      bestD = d
+      best = tip
+      found = true
+  (found, best)
+
+proc runMiner*(w: World, side: Side, r: Robot) =
+  let brain = side.brainFor(r)
+  brain.turnCount += 1
+  w.readBlocks(side, r)
+  w.noteEnemyHq(side)
+  if w.fleeWater(side, r): return
+  if r.dead: return
+
+  w.electBuilder(side)
+  if r.id == side.builderId:
+    let (wanted, kind) = w.nextBuilding(side)
+    if wanted and isReady(r):
+      if w.tryBuild(side, r, kind):
+        return
+
+  let spec = RobotSpecs[rtMiner]
+  let full = r.soupCarrying >= spec.soupLimit
+  let (haveSoup, soupAt) = w.nearestSoup(r, side)
+
+  if full or (r.soupCarrying > 0 and not haveSoup):
+    let (haveRefinery, refineryAt) = w.nearestRefinery(r, side)
+    if haveRefinery:
+      if r.loc.isAdjacentTo(refineryAt):
+        let d = fromDelta(refineryAt.x - r.loc.x, refineryAt.y - r.loc.y)
+        if w.canDepositSoup(r, d):
+          w.depositSoup(r, d, r.soupCarrying)
+          return
+      w.stepToward(side, r, refineryAt)
+      return
+
+  if haveSoup:
+    if r.loc.isAdjacentTo(soupAt) or r.loc == soupAt:
+      let d = fromDelta(soupAt.x - r.loc.x, soupAt.y - r.loc.y)
+      if w.canMineSoup(r, d):
+        w.mineSoup(r, d)
+        brain.soupTip = soupAt
+        brain.hasSoupTip = w.getSoup(soupAt) > 0
+        if not brain.announcedSoup and w.getSoup(soupAt) >= SoupTipThreshold:
+          brain.announcedSoup = true
+          w.broadcast(side, r, SigAnnounceSoup, soupAt.x, soupAt.y)
+        return
+    w.stepToward(side, r, soupAt)
+    return
+
+  ## Nothing in sight and nothing on the chain: EXPLORE. A soup pool is 66
+  ## tiles on 1024 on some maps, and a miner that only ever looks inside its
+  ## own 113-tile window and then walks home mines nothing at all for the whole
+  ## game — which is how a team ends up with no design school, no landscapers
+  ## and a drowned HQ. The target is a pure function of the robot's own RNG, so
+  ## the search stays deterministic.
+  if not brain.hasTarget or r.loc == brain.target or
+      w.isFlooded(brain.target) or brain.turnCount mod 60 == 0:
+    brain.target = loc(int(brain.rng.nextDouble() * float(w.width)),
+                       int(brain.rng.nextDouble() * float(w.height)))
+    if not w.onTheMap(brain.target):
+      brain.target = side.hqLoc
+    brain.hasTarget = true
+  w.stepToward(side, r, brain.target)
diff --git a/src/battlecode/years/bc20/chassis/netgun.nim b/src/battlecode/years/bc20/chassis/netgun.nim
new file mode 100644
index 0000000..81378f4
--- /dev/null
+++ b/src/battlecode/years/bc20/chassis/netgun.nim
@@ -0,0 +1,12 @@
+## The Net Gun: shoot the closest enemy drone within `r² <= 15`, preferring one
+## that is CARRYING a unit — the carried unit dies with it if the drop would
+## have been over water.
+##
+## Behaviour, not code, from `StoneT2000/Battlecode2020` (AGPL-3.0; see NOTICE).
+
+import kit, hq
+
+proc runNetGun*(w: World, side: Side, r: Robot) =
+  let brain = side.brainFor(r)
+  brain.turnCount += 1
+  discard w.shootNearestDrone(side, r)
diff --git a/src/battlecode/years/bc20/chassis/pathing.nim b/src/battlecode/years/bc20/chassis/pathing.nim
new file mode 100644
index 0000000..bbedb46
--- /dev/null
+++ b/src/battlecode/years/bc20/chassis/pathing.nim
@@ -0,0 +1,106 @@
+## Pathing: the bug-walk-with-BFS-window Bowl of Chowder used.
+##
+## A bounded BFS over the tiles this robot can actually SENSE (r² 24 or 35 by
+## unit), falling back to a greedy wall-follow when the target is outside the
+## window, with a six-tile no-repeat history to break oscillation. Every node
+## expansion and every direction evaluation is charged against the robot's
+## `DecisionOps` budget, so a pathing call can never blow the per-turn cost.
+##
+## Behaviour, not code, from `StoneT2000/Battlecode2020` (AGPL-3.0; see NOTICE).
+
+import std/tables
+import kit
+
+const HistoryLen = 6
+
+proc remember(brain: Brain, l: Loc) =
+  brain.history.add(l)
+  if brain.history.len > HistoryLen:
+    brain.history.delete(0)
+
+proc recentlyVisited(brain: Brain, l: Loc): bool =
+  for seen in brain.history:
+    if seen == l: return true
+  false
+
+proc passable*(w: World, r: Robot, fromLoc, toLoc: Loc): bool =
+  ## The move legality a path may plan through: on the map, unoccupied, within
+  ## the elevation step, and — for a ground unit — dry both now and next round.
+  if not w.onTheMap(toLoc): return false
+  if w.isLocationOccupied(toLoc): return false
+  if not r.kind.canFly():
+    if w.getDirtDifference(fromLoc, toLoc) > MaxDirtDifference: return false
+    if w.isFlooded(toLoc): return false
+  true
+
+proc stepToward*(w: World, side: Side, r: Robot, target: Loc): bool
+    {.discardable.} =
+  ## One move toward `target`. Returns true when the robot moved.
+  if not isReady(r): return false
+  if r.loc == target: return false
+  let brain = side.brainFor(r)
+  var bestDir = dCenter
+  var bestScore = high(int)
+  var fallbackDir = dCenter
+  var fallbackScore = high(int)
+  for d in MoveDirs:
+    if not r.spend(1): break
+    let candidate = r.loc + d
+    if not w.passable(r, r.loc, candidate): continue
+    ## A ground unit never steps onto a tile the flood takes next round.
+    if not r.kind.canFly() and w.willFloodNextRound(candidate): continue
+    let score = candidate.distanceSquaredTo(target)
+    if score < fallbackScore:
+      fallbackScore = score
+      fallbackDir = d
+    if brain.recentlyVisited(candidate): continue
+    if score < bestScore:
+      bestScore = score
+      bestDir = d
+  var chosen = bestDir
+  if chosen == dCenter: chosen = fallbackDir
+  if chosen == dCenter: return false
+  ## Only step if it is an improvement, or if the history says we are stuck —
+  ## the wall-follow half of the bug walk.
+  let here = r.loc.distanceSquaredTo(target)
+  let there = (r.loc + chosen).distanceSquaredTo(target)
+  if there >= here and brain.history.len < HistoryLen:
+    brain.remember(r.loc)
+  w.move(r, chosen)
+  if r.dead: return false
+  brain.remember(r.loc)
+  true
+
+proc fleeWater*(w: World, side: Side, r: Robot): bool {.discardable.} =
+  ## Every ground unit leaves a tile that will flood next round, before it does
+  ## anything else. A drone ignores this.
+  if r.kind.canFly(): return false
+  if not w.willFloodNextRound(r.loc): return false
+  if not isReady(r): return false
+  var bestDir = dCenter
+  var bestElev = low(int)
+  for d in MoveDirs:
+    if not r.spend(1): break
+    let candidate = r.loc + d
+    if not w.passable(r, r.loc, candidate): continue
+    if w.willFloodNextRound(candidate): continue
+    let e = w.getDirt(candidate)
+    if e > bestElev:
+      bestElev = e
+      bestDir = d
+  if bestDir == dCenter: return false
+  w.move(r, bestDir)
+  true
+
+proc nearestOf*(w: World, r: Robot, candidates: openArray[Loc]): (bool, Loc) =
+  var best = loc(0, 0)
+  var bestD = high(int)
+  var found = false
+  for l in candidates:
+    if not r.spend(1): break
+    let d = r.loc.distanceSquaredTo(l)
+    if d < bestD:
+      bestD = d
+      best = l
+      found = true
+  (found, best)
diff --git a/src/battlecode/years/bc20/chassis/scaffold.nim b/src/battlecode/years/bc20/chassis/scaffold.nim
new file mode 100644
index 0000000..b0742a7
--- /dev/null
+++ b/src/battlecode/years/bc20/chassis/scaffold.nim
@@ -0,0 +1,133 @@
+## `examplefuncsplayer` — the weak floor and the parity oracle's other side.
+##
+## Ported STATEMENT FOR STATEMENT from
+## `battlecode20/example-bots/src/main/examplefuncsplayer/RobotPlayer.java` at
+## the pinned commit. The fidelity is the point: `parity-oracle` runs the Java
+## engine driving the real examplefuncsplayer against itself and diffs the
+## trace row for row against this (docs/PARITY.md). **It may not gain
+## behaviour.** A "helpful" addition here — walling, terraforming, choosing a
+## better direction — would break the only test that proves the ported rule set
+## is the same rule set.
+##
+## Two upstream facts that look like bugs and are load-bearing:
+##
+##  * `tryBlockchain` builds `new int[10]`, and
+##    `assertCanSubmitTransaction` rejects anything whose length is not
+##    `BLOCKCHAIN_TRANSACTION_LENGTH = 7`. So `canSubmitTransaction` is always
+##    false and **examplefuncsplayer never mints a transaction in 2020**. The
+##    attempt is reproduced, and so is the refusal.
+##  * `randomDirection()` calls `Math.random()`, which is wall-clock seeded, so
+##    the stock bot is not reproducible even against itself. The CI oracle runs
+##    a one-hunk patch of that file that replaces the single live call site
+##    with a per-robot `new java.util.Random(rc.getID())`; this port reproduces
+##    exactly that stream through `rng.nim`.
+
+import kit
+
+const
+  Directions = [dNorth, dEast, dSouth, dWest]
+    ## `RobotPlayer.directions`, in its own order — the random index means the
+    ## order is part of the behaviour.
+  ScaffoldMessageLength = 10
+    ## `new int[10]`. Kept as a named constant so the length refusal below is
+    ## obviously the upstream file's and not a typo here.
+  ScaffoldMessageValue = 123
+  ScaffoldMessageCost = 10
+
+proc randomDirection(brain: Brain): Dir =
+  Directions[int(brain.rng.nextDouble() * float(Directions.len))]
+
+proc tryMove(w: World, r: Robot, d: Dir): bool {.discardable.} =
+  if isReady(r) and w.canMove(r, d):
+    w.move(r, d)
+    return true
+  false
+
+proc tryBuild(w: World, r: Robot, kind: RobotKind, d: Dir): bool
+    {.discardable.} =
+  if isReady(r) and w.canBuildRobot(r, kind, d):
+    w.buildRobot(r, kind, d)
+    return true
+  false
+
+proc tryMine(w: World, r: Robot, d: Dir): bool {.discardable.} =
+  if isReady(r) and w.canMineSoup(r, d):
+    w.mineSoup(r, d)
+    return true
+  false
+
+proc tryDepositSoup(w: World, r: Robot, d: Dir): bool {.discardable.} =
+  if isReady(r) and w.canDepositSoup(r, d):
+    w.depositSoup(r, d, r.soupCarrying)
+    return true
+  false
+
+proc tryBlockchain(w: World, r: Robot, brain: Brain) =
+  ## `turnCount < 3`, i.e. the robot's first two turns. The message is ten ints
+  ## of 123 and the engine's own length check refuses it, so nothing is ever
+  ## submitted — reproduced, not corrected.
+  if brain.turnCount >= 3: return
+  if ScaffoldMessageLength != TransactionLength: return
+  var message: array[TransactionLength, int]
+  for i in 0 ..< TransactionLength:
+    message[i] = ScaffoldMessageValue
+  if w.canSubmitTransaction(r, ScaffoldMessageCost):
+    w.submitTransaction(r, message, ScaffoldMessageCost)
+
+proc runHq(w: World, r: Robot) =
+  for d in Directions:
+    if not r.spend(1): return
+    w.tryBuild(r, rtMiner, d)
+
+proc runMiner(w: World, side: Side, r: Robot, brain: Brain) =
+  w.tryBlockchain(r, brain)
+  ## BOTH `randomDirection()` draws are always consumed, because the second is
+  ## the argument of a `tryMove` inside an `if`.
+  let first = brain.randomDirection()
+  let second = brain.randomDirection()
+  w.tryMove(r, first)
+  w.tryMove(r, second)
+  for d in Directions:
+    if not r.spend(1): return
+    w.tryBuild(r, rtFulfillmentCenter, d)
+  for d in Directions:
+    if not r.spend(1): return
+    w.tryDepositSoup(r, d)
+  for d in Directions:
+    if not r.spend(1): return
+    w.tryMine(r, d)
+
+proc runFulfillmentCenter(w: World, r: Robot) =
+  for d in Directions:
+    if not r.spend(1): return
+    w.tryBuild(r, rtDeliveryDrone, d)
+
+proc runDeliveryDrone(w: World, side: Side, r: Robot, brain: Brain) =
+  if not r.holdingUnit:
+    ## `senseNearbyRobots(DELIVERY_DRONE_PICKUP_RADIUS_SQUARED, enemy)` returns
+    ## the window in `getAllLocationsWithinRadiusSquared` order — x then y —
+    ## and the bot takes `robots[0]`.
+    for l in w.locationsWithinRadiusSquared(r.loc,
+        DeliveryDronePickupRadiusSquared):
+      if not r.spend(1): return
+      let target = w.getRobot(l)
+      if target == nil: continue
+      if target.id == r.id: continue
+      if not w.canSenseLocation(r, l): continue
+      if target.team != side.team.other(): continue
+      if w.canPickUpUnit(r, target.id):
+        w.pickUpUnit(r, target.id)
+      return
+  else:
+    w.tryMove(r, brain.randomDirection())
+
+proc runScaffold*(w: World, side: Side, r: Robot) =
+  let brain = side.brainFor(r)
+  brain.turnCount += 1
+  case r.kind
+  of rtHq: w.runHq(r)
+  of rtMiner: w.runMiner(side, r, brain)
+  of rtFulfillmentCenter: w.runFulfillmentCenter(r)
+  of rtDeliveryDrone: w.runDeliveryDrone(side, r, brain)
+  of rtRefinery, rtVaporator, rtDesignSchool, rtLandscaper, rtNetGun, rtCow:
+    discard
diff --git a/src/battlecode/years/bc20/chassis/signals.nim b/src/battlecode/years/bc20/chassis/signals.nim
new file mode 100644
index 0000000..c7f0480
--- /dev/null
+++ b/src/battlecode/years/bc20/chassis/signals.nim
@@ -0,0 +1,76 @@
+## Signalling: the seven-int blockchain messages the chassis speaks, their fee
+## model, and the plain-words table the endcard decodes them with.
+##
+## A message is `[SIGNAL_KEY, teamOrdinal, code, p0, p1, p2, p3]`, submitted at
+## a fee of `max(1, teamSoup / 200)` and only when `teamSoup > 120`, so the
+## blockchain never starves the build.
+##
+## `SIGNAL_KEY` is a FIXED CONSTANT SHARED BY BOTH TEAMS, and that is
+## deliberate: it reproduces the year's famous meta-gaming vector (both teams
+## read every block) and it is what lets the endcard decode both sides'
+## traffic. A team that wants privacy has to pay for it in obscurity, exactly
+## as in 2020.
+
+import kit
+
+const
+  SignalKey* = 0x50415041      ## "PAPA" — Bowl of Chowder's own convention
+  SigHqLocation* = 1
+  SigAnnounceSoup* = 2
+  SigWallIn* = 3
+  SigHqUnderAttack* = 4
+  SigNeedDrones* = 5
+  SigRushNow* = 6
+  SigWallClosed* = 7
+
+  SignalNames*: array[1 .. 7, string] = [
+    "HQ_LOCATION", "ANNOUNCE_SOUP", "WALL_IN", "HQ_UNDER_ATTACK",
+    "NEED_DRONES", "RUSH_NOW", "WALL_CLOSED"
+  ]
+
+proc signalName*(code: int): string =
+  if code >= 1 and code <= 7: SignalNames[code] else: "CODE_" & $code
+
+proc fee(w: World, side: Side): int =
+  max(1, w.stats.soup[ord(side.team)] div 200)
+
+proc broadcast*(w: World, side: Side, r: Robot, code: int,
+                p0 = 0, p1 = 0, p2 = 0, p3 = 0): bool {.discardable.} =
+  ## Submitting a transaction is NOT an action: no cooldown, no `isReady`
+  ## check. It still costs soup, so it is gated on a healthy pool.
+  if w.stats.soup[ord(side.team)] <= 120: return false
+  let cost = fee(w, side)
+  let message: array[TransactionLength, int] =
+    [SignalKey, ord(side.team), code, p0, p1, p2, p3]
+  if not w.canSubmitTransaction(r, cost): return false
+  w.submitTransaction(r, message, cost)
+  true
+
+proc readBlocks*(w: World, side: Side, r: Robot) =
+  ## Every block minted since this side last looked. Charged one credit per
+  ## block read, exactly like a sense.
+  while side.nextBlockToRead < w.currentRound:
+    if not r.spend(1): return
+    let minted = w.getBlock(side.nextBlockToRead)
+    side.nextBlockToRead += 1
+    for t in minted:
+      if t.message[0] != SignalKey: continue
+      if t.message[1] != ord(side.team): continue
+      case t.message[2]
+      of SigHqLocation:
+        side.hqLoc = loc(t.message[3], t.message[4])
+        side.hasHq = true
+      of SigAnnounceSoup:
+        let tip = loc(t.message[3], t.message[4])
+        var known = false
+        for existing in side.soupTips:
+          if existing == tip: known = true
+        if not known and side.soupTips.len < 8:
+          side.soupTips.add(tip)
+      of SigWallClosed:
+        if not side.wallClosed:
+          side.wallClosed = true
+          side.wallClosedRound = w.currentRound
+      of SigRushNow:
+        side.rushLaunched = true
+      else: discard
diff --git a/src/battlecode/years/bc20/constants.nim b/src/battlecode/years/bc20/constants.nim
new file mode 100644
index 0000000..542b1f7
--- /dev/null
+++ b/src/battlecode/years/bc20/constants.nim
@@ -0,0 +1,123 @@
+## Battlecode 2020 "Soup" gameplay constants -- GENERATED, do not edit.
+##
+## Source: github.com/battlecode/battlecode20 at commit `7618f6be7d12da39f2e6e25801e578f1fecfbd86`,
+## files `common/GameConstants.java` and `common/RobotType.java`, read by
+## `tools/gen_year_constants.py --year bc20`. `tests/test_bc20_constants.nim`
+## regenerates this file and byte-diffs it, so an edit here fails the build
+## instead of quietly changing the rules under a `GameVersion` that no
+## longer describes them.
+##
+## The two derived functions `getWaterLevel`, `getSensorRadiusPollutionCoefficient`
+## and `getCooldownPollutionCoefficient` are NOT constants and live in
+## `flood.nim` and `pollution.nim`.
+
+const EngineCommit* = "7618f6be7d12da39f2e6e25801e578f1fecfbd86"
+
+type
+  RobotKind* = enum
+    rtHq = "HQ"
+    rtMiner = "MINER"
+    rtRefinery = "REFINERY"
+    rtVaporator = "VAPORATOR"
+    rtDesignSchool = "DESIGN_SCHOOL"
+    rtFulfillmentCenter = "FULFILLMENT_CENTER"
+    rtLandscaper = "LANDSCAPER"
+    rtDeliveryDrone = "DELIVERY_DRONE"
+    rtNetGun = "NET_GUN"
+    rtCow = "COW"
+
+  RobotSpec* = object
+    ## `common/RobotType.java`'s constructor arguments, verbatim.
+    cost*, dirtLimit*, soupLimit*: int
+    actionCooldown*: float32
+    sensorRadiusSquared*, pollutionRadiusSquared*: int
+    localPollutionAdditiveEffect*: int
+    localPollutionMultiplicativeEffect*: float32
+    globalPollutionAmount*, maxSoupProduced*, bytecodeLimit*: int
+    decisionOps*: int
+
+const
+  SpecVersion*: string = "1.0"
+  MapMinHeight*: int = 32
+  MapMaxHeight*: int = 64
+  MapMinWidth*: int = 32
+  MapMaxWidth*: int = 64
+  MinWaterElevation*: int = -1073741824
+  NumberOfIndicatorStrings*: int = 3
+  ExceptionBytecodePenalty*: int = 500
+  MaxRobotId*: int = 32000
+  InitialSoup*: int = 200
+  BaseIncomePerRound*: int = 1
+  SoupMiningRate*: int = 7
+  MaxDirtDifference*: int = 3
+  DeliveryDronePickupRadiusSquared*: int = 3
+  NetGunShootRadiusSquared*: int = 15
+  BlockchainTransactionLength*: int = 7
+  NumberOfTransactionsPerBlock*: int = 7
+  InitialCooldownTurns*: int = 10
+  GameDefaultSeed*: int = 6370
+  GameMaxNumberOfRounds*: int = 10000
+
+  RobotSpecs*: array[RobotKind, RobotSpec] = [
+    rtHq: RobotSpec(cost: 0, dirtLimit: 50, soupLimit: 0,
+      actionCooldown: 1'f32, sensorRadiusSquared: 48,
+      pollutionRadiusSquared: 35, localPollutionAdditiveEffect: 500,
+      localPollutionMultiplicativeEffect: 1'f32,
+      globalPollutionAmount: 1, maxSoupProduced: 20,
+      bytecodeLimit: 20000, decisionOps: 2000),
+    rtMiner: RobotSpec(cost: 70, dirtLimit: 0, soupLimit: 100,
+      actionCooldown: 1'f32, sensorRadiusSquared: 35,
+      pollutionRadiusSquared: 0, localPollutionAdditiveEffect: 0,
+      localPollutionMultiplicativeEffect: 1'f32,
+      globalPollutionAmount: 0, maxSoupProduced: 0,
+      bytecodeLimit: 10000, decisionOps: 1000),
+    rtRefinery: RobotSpec(cost: 200, dirtLimit: 15, soupLimit: 0,
+      actionCooldown: 1'f32, sensorRadiusSquared: 24,
+      pollutionRadiusSquared: 35, localPollutionAdditiveEffect: 500,
+      localPollutionMultiplicativeEffect: 1'f32,
+      globalPollutionAmount: 1, maxSoupProduced: 20,
+      bytecodeLimit: 5000, decisionOps: 500),
+    rtVaporator: RobotSpec(cost: 500, dirtLimit: 15, soupLimit: 0,
+      actionCooldown: 1'f32, sensorRadiusSquared: 24,
+      pollutionRadiusSquared: 35, localPollutionAdditiveEffect: 0,
+      localPollutionMultiplicativeEffect: 0.80'f32,
+      globalPollutionAmount: -1, maxSoupProduced: 2,
+      bytecodeLimit: 5000, decisionOps: 500),
+    rtDesignSchool: RobotSpec(cost: 150, dirtLimit: 15, soupLimit: 0,
+      actionCooldown: 1'f32, sensorRadiusSquared: 24,
+      pollutionRadiusSquared: 0, localPollutionAdditiveEffect: 0,
+      localPollutionMultiplicativeEffect: 1'f32,
+      globalPollutionAmount: 0, maxSoupProduced: 0,
+      bytecodeLimit: 5000, decisionOps: 500),
+    rtFulfillmentCenter: RobotSpec(cost: 150, dirtLimit: 15, soupLimit: 0,
+      actionCooldown: 1'f32, sensorRadiusSquared: 24,
+      pollutionRadiusSquared: 0, localPollutionAdditiveEffect: 0,
+      localPollutionMultiplicativeEffect: 1'f32,
+      globalPollutionAmount: 0, maxSoupProduced: 0,
+      bytecodeLimit: 5000, decisionOps: 500),
+    rtLandscaper: RobotSpec(cost: 150, dirtLimit: 25, soupLimit: 0,
+      actionCooldown: 1'f32, sensorRadiusSquared: 24,
+      pollutionRadiusSquared: 0, localPollutionAdditiveEffect: 0,
+      localPollutionMultiplicativeEffect: 1'f32,
+      globalPollutionAmount: 0, maxSoupProduced: 0,
+      bytecodeLimit: 10000, decisionOps: 1000),
+    rtDeliveryDrone: RobotSpec(cost: 150, dirtLimit: 0, soupLimit: 0,
+      actionCooldown: 1.5'f32, sensorRadiusSquared: 24,
+      pollutionRadiusSquared: 0, localPollutionAdditiveEffect: 0,
+      localPollutionMultiplicativeEffect: 1'f32,
+      globalPollutionAmount: 0, maxSoupProduced: 0,
+      bytecodeLimit: 10000, decisionOps: 1000),
+    rtNetGun: RobotSpec(cost: 250, dirtLimit: 15, soupLimit: 0,
+      actionCooldown: 1'f32, sensorRadiusSquared: 24,
+      pollutionRadiusSquared: 0, localPollutionAdditiveEffect: 0,
+      localPollutionMultiplicativeEffect: 1'f32,
+      globalPollutionAmount: 0, maxSoupProduced: 0,
+      bytecodeLimit: 7000, decisionOps: 700),
+    rtCow: RobotSpec(cost: 0, dirtLimit: 0, soupLimit: 0,
+      actionCooldown: 2'f32, sensorRadiusSquared: 10000,
+      pollutionRadiusSquared: 15, localPollutionAdditiveEffect: 2000,
+      localPollutionMultiplicativeEffect: 1'f32,
+      globalPollutionAmount: 0, maxSoupProduced: 0,
+      bytecodeLimit: 0, decisionOps: 0),
+  ]
+
diff --git a/src/battlecode/years/bc20/cows.nim b/src/battlecode/years/bc20/cows.nim
new file mode 100644
index 0000000..45ac7b5
--- /dev/null
+++ b/src/battlecode/years/bc20/cows.nim
@@ -0,0 +1,75 @@
+## The NPC cows: `world/control/CowControlProvider.java`, ported exactly.
+##
+## A cow's RNG is `new Random(84307 * mapSeed + 20201 * (cowId / 2))`, created
+## LAZILY on the cow's first turn. Each turn:
+##
+##  * if the cow is ready, draw up to FOUR directions as
+##    `DIRECTIONS[floor(nextDouble() * 8)]`, reversing the direction when the
+##    cow's id is odd, and move on the first draw that is legal AND whose
+##    destination is not flooded — STOPPING THE DRAW LOOP the moment it moves;
+##  * if the cow is not ready, burn exactly four `nextDouble()` calls and do
+##    nothing.
+##
+## The reversal uses the map symmetry, which the engine recomputes on every
+## NEUTRAL spawn. Cows only exist at map load, so the value is fixed for the
+## match — but it is still read from the world, not from the map file, because
+## that is where the engine reads it.
+
+import ../../rng
+import world
+
+const CowDirections* = MoveDirs
+  ## `CowControlProvider.DIRECTIONS`: N, NE, E, SE, S, SW, W, NW.
+
+proc reverseDirection*(w: World, d: Dir): Dir =
+  case w.symmetry
+  of symHorizontal:
+    case d
+    of dNortheast: dSoutheast
+    of dSoutheast: dNortheast
+    of dNorth: dSouth
+    of dSouth: dNorth
+    of dNorthwest: dSouthwest
+    of dSouthwest: dNorthwest
+    else: d
+  of symVertical:
+    case d
+    of dNortheast: dNorthwest
+    of dSoutheast: dSouthwest
+    of dNorthwest: dNortheast
+    of dSouthwest: dSoutheast
+    of dWest: dEast
+    of dEast: dWest
+    else: d
+  of symRotational:
+    d.opposite()
+
+proc cowSeed*(mapSeed, cowId: int): int =
+  ## `84307 * world.getMapSeed() + 20201 * (cow.getID() / 2)` is Java `int`
+  ## arithmetic and it OVERFLOWS on most map seeds (`84307 * 43223` alone is
+  ## 3 644 001 461). Java wraps; a checked Nim conversion would raise on
+  ## exactly the seeds that matter, so the product is taken in `uint32` and
+  ## reinterpreted, then sign-extended by `new Random(long)`.
+  let a = cast[uint32](int32(mapSeed)) * 84307'u32
+  let b = cast[uint32](int32(cowId div 2)) * 20201'u32
+  int(cast[int32](a + b))
+
+proc runCow*(w: World, cow: Robot) =
+  if cow.id notin w.cowRand:
+    w.cowRand[cow.id] = initJavaRandom(cowSeed(w.map.randomSeed, cow.id))
+  var rng = w.cowRand[cow.id]
+  var i = 4
+  if isReady(cow):
+    while i > 0:
+      dec i
+      var d = CowDirections[int(rng.nextDouble() * 8.0)]
+      if cow.id mod 2 == 1:
+        d = w.reverseDirection(d)
+      if w.canMove(cow, d) and not w.isFlooded(cow.loc + d):
+        w.move(cow, d)
+        break
+  else:
+    while i > 0:
+      dec i
+      discard rng.nextDouble()
+  w.cowRand[cow.id] = rng
diff --git a/src/battlecode/years/bc20/flood.nim b/src/battlecode/years/bc20/flood.nim
new file mode 100644
index 0000000..07cf9a8
--- /dev/null
+++ b/src/battlecode/years/bc20/flood.nim
@@ -0,0 +1,103 @@
+## The rising water: the committed level table, the one-ring-per-round flood
+## fill, and drowning.
+##
+## THE WATER LEVEL IS A COMMITTED TABLE, NOT A FORMULA.
+## `GameConstants.getWaterLevel` is
+##
+##     (float)(Math.exp(0.0028x - 1.38*Math.sin(0.00157x - 1.73)
+##                      + 1.38*Math.sin(-1.73)) - 1)
+##
+## and `Math.exp` / `Math.sin` are HotSpot intrinsics that are not bit-identical
+## to any libm this port would link natively or under emscripten. The function
+## depends only on the round number, so `tools/JavaWaterLevels.java` emits every
+## value in `data/bc20/water_levels.json` as a float32 BIT PATTERN under the CI
+## JDK, the file is COMMITTED, and the `parity-oracle` job regenerates and
+## byte-diffs it as a BLOCKING step. Bit-exact against Java by construction, on
+## every platform, with no libm in the loop.
+##
+## `floodfill` snapshots the flooded set BEFORE it changes anything, which is
+## what makes the flood advance exactly one ring per round.
+
+import std/[json, os, strutils]
+import world
+
+const WaterTableMaxRound* = 1500
+
+var
+  waterTable: seq[float32]
+  waterTableLoaded = false
+
+proc bc20DataRoot*(): string =
+  ## `/data` is where emscripten mounts the preloaded directory in the wasm
+  ## bundle; `data` is the repo layout the container and the tests use.
+  ##
+  ## `getAppDir()` is DELIBERATELY not a candidate: under emscripten it walks
+  ## `os.getApplAux`, whose `readlink("/proc/self/exe")` returns -1 and whose
+  ## next line is a `Natural` conversion that raises before anything is opened.
+  for candidate in ["data", "/data", "/workspace/battlecode/data"]:
+    if dirExists(candidate / "maps" / "bc20"):
+      return candidate
+  "data"
+
+proc loadWaterTable*() =
+  if waterTableLoaded: return
+  let path = bc20DataRoot() / "bc20" / "water_levels.json"
+  if not fileExists(path):
+    raise newException(IOError,
+      "the bc20 water-level table is missing: no " & path &
+      " (in the wasm bundle this means the preloaded data package did not " &
+      "mount). It is generated by tools/JavaWaterLevels.java and committed.")
+  let doc = parseJson(readFile(path))
+  waterTable = @[]
+  for entry in doc["levels"]:
+    let bits = uint32(parseHexInt(entry.getStr()))
+    waterTable.add(cast[float32](bits))
+  if waterTable.len != WaterTableMaxRound + 1:
+    raise newException(IOError,
+      "the bc20 water-level table has " & $waterTable.len &
+      " entries, expected " & $(WaterTableMaxRound + 1))
+  waterTableLoaded = true
+
+proc waterLevelAt*(round: int): float32 =
+  ## `GameConstants.getWaterLevel(round)`, from the committed table. Rounds
+  ## past the table's end clamp to its last value; the bc20 variant caps at
+  ## 1500, and the chassis look ahead by at most 400 rounds, so the clamp is
+  ## only ever reached by a doctrine planning past the end of the game.
+  loadWaterTable()
+  if round <= 0: return waterTable[0]
+  waterTable[min(round, WaterTableMaxRound)]
+
+proc updateWaterLevel*(w: World) =
+  w.waterLevel = waterLevelAt(w.currentRound)
+
+proc floodfill*(w: World) =
+  ## `GameWorld.floodfill`. The origin set is SNAPSHOTTED first, so the flood
+  ## advances exactly one ring per round; `setFloodStatus` destroys any robot
+  ## standing on a newly flooded tile that cannot fly.
+  var origins: seq[int]
+  for i in 0 ..< w.flooded.len:
+    if w.flooded[i]: origins.add(i)
+  for i in origins:
+    let center = w.indexToLoc(i)
+    for d in AllDirs:
+      let target = center + d
+      if not w.onTheMap(target): continue
+      let j = w.idx(target)
+      if w.flooded[j]: continue
+      if float32(w.elevation[j]) >= w.waterLevel: continue
+      w.setFloodStatus(j, true)
+
+proc roundWaterReaches*(level: int): int =
+  ## The first round at which the water is strictly above `level`, i.e. the
+  ## round a tile at that elevation floods if it is next to water. Returns
+  ## `WaterTableMaxRound + 1` when the water never gets there inside the cap.
+  loadWaterTable()
+  for r in 0 .. WaterTableMaxRound:
+    if waterTable[r] > float32(level):
+      return r
+  WaterTableMaxRound + 1
+
+proc floodStageFor*(level: float32): int =
+  ## Which integer elevation the water has just reached — the `flood_stage`
+  ## beat the viewer draws. 0 while the water is below elevation 1.
+  if level < 1.0'f32: 0 else: int(level)
diff --git a/src/battlecode/years/bc20/knobs.nim b/src/battlecode/years/bc20/knobs.nim
new file mode 100644
index 0000000..8975e56
--- /dev/null
+++ b/src/battlecode/years/bc20/knobs.nim
@@ -0,0 +1,178 @@
+## The Battlecode 2020 "Soup" knob table: TEN knobs, and NO `chassis` key.
+##
+## D1 (sibling review finding, 2026-09-03): the chassis is not an
+## LLM-selectable knob. The chassis a seat drives comes from `PLAYER_SCRIPTED`
+## (scripted seats) or is the fixed champion chassis (LLM seats). A submitted
+## `chassis` is therefore recorded as an UNKNOWN FIELD and never honoured, and
+## `tests/test_bc20_sheet.nim` asserts exactly that — the test fails if anyone
+## re-adds the knob.
+##
+## Unknown key, wrong type or out-of-range value takes THAT FIELD'S DEFAULT and
+## the repair is recorded. A sheet can never be rejected, so a cog can never
+## forfeit a match by answering badly — only by answering weakly.
+
+import std/[json, tables]
+import ../../sheet_common
+
+export sheet_common
+
+type
+  Opening* = enum
+    opRush = "rush"
+    opLattice = "lattice"
+    opPassiveLattice = "passive_lattice"
+    opTurtle = "turtle"
+
+  CountCurve* = enum
+    ccLean = "lean"
+    ccSteady = "steady"
+    ccSwarm = "swarm"
+
+  DroneRole* = enum
+    drHarass = "harass"
+    drWall = "wall"
+    drBuster = "buster"
+    drCarryLandscapers = "carry_landscapers"
+
+  Doctrine20* = object
+    ## The ten knobs, each with a named site in the bc20 chassis
+    ## (docs/RULES-BC20.md §The doctrine sheet lists the site per knob).
+    opening*: Opening
+    terraformStartRound*: int
+    latticeRadius*: int
+    landscaperCountCurve*: CountCurve
+    minerCountCurve*: CountCurve
+    vaporatorBudget*: int
+    droneRole*: DroneRole
+    netGunRing*: int
+    rushTrigger*: int
+    wallHqRound*: int
+
+const
+  KnownKeys20* = [
+    "opening", "terraform_start_round", "lattice_radius",
+    "landscaper_count_curve", "miner_count_curve", "vaporator_budget",
+    "drone_role", "net_gun_ring", "rush_trigger", "wall_hq_round"
+  ]
+    ## Exactly ten. `chassis` is deliberately NOT here (D1).
+
+proc defaultDoctrine20*(): Doctrine20 =
+  Doctrine20(
+    opening: opPassiveLattice,
+    terraformStartRound: 300,
+    latticeRadius: 6,
+    landscaperCountCurve: ccSteady,
+    minerCountCurve: ccSteady,
+    vaporatorBudget: 2,
+    droneRole: drHarass,
+    netGunRing: 2,
+    rushTrigger: 0,
+    wallHqRound: 250
+  )
+
+proc applyKnobs20*(seen: Table[string, JsonNode],
+                   defaultsApplied: var seq[string]): Doctrine20 =
+  result = defaultDoctrine20()
+
+  template repair(name: string) =
+    defaultsApplied.add(name)
+
+  template enumKnob(name: string, field: untyped, T: typedesc) =
+    if name in seen:
+      if seen[name].kind == JString:
+        let text = normalizeKey(seen[name].getStr())
+        var found = false
+        for value in T:
+          if normalizeKey($value) == text:
+            field = value
+            found = true
+        if not found: repair(name)
+      else:
+        repair(name)
+
+  template intKnob(name: string, field: untyped, lo, hi: int) =
+    if name in seen:
+      let n = readNumber(seen[name])
+      if n.ok and n.value >= float(lo) and n.value <= float(hi):
+        field = int(n.value)
+      else:
+        repair(name)
+
+  enumKnob("opening", result.opening, Opening)
+  intKnob("terraform_start_round", result.terraformStartRound, 1, 1500)
+  intKnob("lattice_radius", result.latticeRadius, 2, 12)
+  enumKnob("landscaper_count_curve", result.landscaperCountCurve, CountCurve)
+  enumKnob("miner_count_curve", result.minerCountCurve, CountCurve)
+  intKnob("vaporator_budget", result.vaporatorBudget, 0, 6)
+  enumKnob("drone_role", result.droneRole, DroneRole)
+  intKnob("net_gun_ring", result.netGunRing, 0, 6)
+  intKnob("rush_trigger", result.rushTrigger, 0, 1500)
+  intKnob("wall_hq_round", result.wallHqRound, 0, 1500)
+
+proc toJson20*(d: Doctrine20): JsonNode =
+  %*{
+    "opening": $d.opening,
+    "terraform_start_round": d.terraformStartRound,
+    "lattice_radius": d.latticeRadius,
+    "landscaper_count_curve": $d.landscaperCountCurve,
+    "miner_count_curve": $d.minerCountCurve,
+    "vaporator_budget": d.vaporatorBudget,
+    "drone_role": $d.droneRole,
+    "net_gun_ring": d.netGunRing,
+    "rush_trigger": d.rushTrigger,
+    "wall_hq_round": d.wallHqRound
+  }
+
+proc plainWords20*(d: Doctrine20): seq[string] =
+  ## The endcard/`#bc20-doctrines` readout: the sheet in words a spectator can
+  ## read without knowing the schema.
+  case d.opening
+  of opRush: result.add("rushes the enemy HQ")
+  of opLattice: result.add("lattices outward")
+  of opPassiveLattice: result.add("lattices inward first")
+  of opTurtle: result.add("turtles")
+  if d.rushTrigger > 0:
+    result.add("commits at round " & $d.rushTrigger)
+  else:
+    result.add("never commits a rush")
+  if d.wallHqRound > 0:
+    result.add("walls at " & $d.wallHqRound)
+  else:
+    result.add("never walls its HQ")
+  result.add("terraforms from " & $d.terraformStartRound)
+  result.add("lattice radius " & $d.latticeRadius)
+  result.add($d.landscaperCountCurve & " landscapers")
+  result.add($d.minerCountCurve & " miners")
+  if d.vaporatorBudget == 0:
+    result.add("no vaporators")
+  else:
+    result.add($d.vaporatorBudget & " vaporators")
+  case d.droneRole
+  of drHarass: result.add("drones harass")
+  of drWall: result.add("drones wall")
+  of drBuster: result.add("drones bust walls")
+  of drCarryLandscapers: result.add("drones ferry landscapers")
+  if d.netGunRing == 0:
+    result.add("no net guns")
+  else:
+    result.add($d.netGunRing & " net guns")
+
+proc landscaperTarget*(d: Doctrine20, round: int): int =
+  ## `hq.nim` / `designschool.nim`: `4 + round/220`, scaled 0.6 / 1.0 / 1.7 by
+  ## `landscaper_count_curve` and capped at 40.
+  let base = 4.0 + float(round) / 220.0
+  let scale = case d.landscaperCountCurve
+              of ccLean: 0.6
+              of ccSteady: 1.0
+              of ccSwarm: 1.7
+  min(40, int(base * scale))
+
+proc minerTarget*(d: Doctrine20, round: int): int =
+  ## `hq.nim`: `6 + round/300`, scaled 0.6 / 1.0 / 1.7 by `miner_count_curve`
+  ## and capped at 25.
+  let base = 6.0 + float(round) / 300.0
+  let scale = case d.minerCountCurve
+              of ccLean: 0.6
+              of ccSteady: 1.0
+              of ccSwarm: 1.7
+  min(25, max(1, int(base * scale)))
diff --git a/src/battlecode/years/bc20/maps.nim b/src/battlecode/years/bc20/maps.nim
new file mode 100644
index 0000000..4bb64fd
--- /dev/null
+++ b/src/battlecode/years/bc20/maps.nim
@@ -0,0 +1,155 @@
+## The converted bc20 map pool, the loader and the per-episode draw.
+##
+## Maps are read from `data/maps/bc20/<name>.json`, produced by
+## `tools/convert_maps_bc20.py` from the official `.map20` files at the pinned
+## battlecode20 commit and COMMITTED (CI re-converts and diffs). The wasm
+## bundle gets the same directory through emscripten's `--preload-file
+## data@data`, so the browser re-derives from exactly the bytes the server
+## played.
+##
+## 18 of the 52 official maps are converted. `CowFarm` and
+## `DidAMonkeyMakeThis` are deliberately excluded: both carry tiles at
+## `Integer.MAX_VALUE/2` elevation, which is legal but makes the elevation
+## shading meaningless and the timing untypical (docs/RULES-BC20.md).
+
+import std/[json, os, strutils]
+import ../../sim_types
+import world, flood
+
+const
+  SmallPool* = ["maptestsmall", "WateredDown", "Infinity", "Spiral",
+                "Hourglass", "ALandDivided"]
+  MixedPool* = ["maptestsmall", "WateredDown", "Infinity", "Spiral",
+                "Hourglass", "ALandDivided", "Climb", "Constriction",
+                "CentralLake", "Toothpaste", "TwoLakeLand", "CentralSoup"]
+  LargePool* = ["Hills", "OmgThisIsProcedural", "Squares",
+                "BeachFrontProperty", "Maze", "TheHighGround"]
+
+proc poolNames*(pool: string): seq[string] =
+  case pool.toLowerAscii()
+  of "small": @SmallPool
+  of "large": @LargePool
+  of "mixed", "": @MixedPool
+  else: @[]
+
+proc dataRoot*(): string = bc20DataRoot()
+
+proc parseSymmetry(text: string): Symmetry =
+  case text
+  of "vertical": symVertical
+  of "horizontal": symHorizontal
+  else: symRotational
+
+proc parseKind(text: string): RobotKind =
+  case text
+  of "hq": rtHq
+  of "miner": rtMiner
+  of "refinery": rtRefinery
+  of "vaporator": rtVaporator
+  of "design_school": rtDesignSchool
+  of "fulfillment_center": rtFulfillmentCenter
+  of "landscaper": rtLandscaper
+  of "delivery_drone": rtDeliveryDrone
+  of "net_gun": rtNetGun
+  else: rtCow
+
+proc parseTeam(text: string): Team =
+  case text
+  of "A": teamA
+  of "B": teamB
+  else: teamNeutral
+
+proc parseMapSpec*(text: string): MapSpec =
+  let doc = parseJson(text)
+  result.name = doc["name"].getStr()
+  result.width = doc["width"].getInt()
+  result.height = doc["height"].getInt()
+  result.symmetry = parseSymmetry(doc["symmetry"].getStr())
+  result.randomSeed = doc["random_seed"].getInt()
+  result.initialWater = doc["initial_water"].getInt()
+  for v in doc["elevation"]: result.elevation.add(v.getInt())
+  for v in doc["water"]: result.water.add(v.getBool())
+  for v in doc["pollution"]: result.pollution.add(v.getInt())
+  for v in doc["soup"]: result.soup.add(v.getInt())
+  for b in doc["initial_bodies"]:
+    result.initialBodies.add(InitialBody(
+      id: b["id"].getInt(),
+      team: parseTeam(b["team"].getStr()),
+      kind: parseKind(b["type"].getStr()),
+      loc: loc(b["x"].getInt(), b["y"].getInt())))
+  let expected = result.width * result.height
+  if result.elevation.len != expected or result.water.len != expected or
+      result.soup.len != expected or result.pollution.len != expected:
+    raise newException(ConfigError,
+      "bc20 map " & result.name & " has inconsistent tile arrays")
+
+proc mapPath*(name: string): string =
+  dataRoot() / "maps" / "bc20" / (name & ".json")
+
+proc loadMap*(name: string): MapSpec =
+  let path = mapPath(name)
+  if not fileExists(path):
+    raise newException(ConfigError, "no converted bc20 map at " & path)
+  parseMapSpec(readFile(path))
+
+proc drawMaps*(pool: string, seed, count: int): seq[string] =
+  ## `count` DISTINCT maps from the pool, chosen by successive seed-derived
+  ## indices. Deterministic in the episode seed and recorded in the results, so
+  ## a spectator can re-run the same three games. Identical in shape to bc26's
+  ## draw, so the two years rank the same way for the same seed.
+  let names = poolNames(pool)
+  var remaining = names
+  var s = uint32(seed) xor 0x9E3779B9'u32
+  for i in 0 ..< min(count, remaining.len):
+    s = s * 1664525'u32 + 1013904223'u32
+    let pick = int(s shr 16) mod remaining.len
+    result.add(remaining[pick])
+    remaining.delete(pick)
+
+proc sideAslotFor*(seed, gameIndex: int): int =
+  ## `(seed shr 8) and 1` picks which SEAT takes side A in game 1; sides
+  ## alternate every game after that.
+  ((seed shr 8) and 1) xor (gameIndex and 1)
+
+proc hqLocations*(spec: MapSpec): array[2, Loc] =
+  for b in spec.initialBodies:
+    if b.kind == rtHq and b.team != teamNeutral:
+      result[ord(b.team)] = b.loc
+
+proc mapCard*(spec: MapSpec, slot, sideAslot: int): JsonNode =
+  ## The per-map facts a seat may legitimately know before writing its
+  ## doctrine. Every map is symmetric, so both seats see numerically identical
+  ## cards; `you_are` is the only asymmetry.
+  let hqs = spec.hqLocations()
+  let side = if sideAslot == slot: 0 else: 1
+  let mine = hqs[side]
+  var soupTiles = 0
+  var soupTotal = 0
+  var soupNearHq = 0
+  for i, amount in spec.soup:
+    if amount > 0:
+      soupTiles += 1
+      soupTotal += amount
+      let l = loc(i mod spec.width, i div spec.width)
+      if l.distanceSquaredTo(mine) <= 100:
+        soupNearHq += amount
+  var cows = 0
+  for b in spec.initialBodies:
+    if b.kind == rtCow: cows += 1
+  var floodedTiles = 0
+  for wet in spec.water:
+    if wet: floodedTiles += 1
+  %*{
+    "map": spec.name,
+    "width": spec.width,
+    "height": spec.height,
+    "symmetry": ($spec.symmetry).replace("sym", "").toLowerAscii(),
+    "you_are": (if sideAslot == slot: "A" else: "B"),
+    "hq_elevation": spec.elevation[mine.x + spec.width * mine.y],
+    "hq_separation": chebyshev(hqs[0], hqs[1]),
+    "soup_tiles": soupTiles,
+    "soup_total": soupTotal,
+    "soup_near_hq": soupNearHq,
+    "cows": cows,
+    "initially_flooded_tiles": floodedTiles
+  }
diff --git a/src/battlecode/years/bc20/pollution.nim b/src/battlecode/years/bc20/pollution.nim
new file mode 100644
index 0000000..3e88229
--- /dev/null
+++ b/src/battlecode/years/bc20/pollution.nim
@@ -0,0 +1,35 @@
+## The two derived pollution coefficients, in Java `float`.
+##
+## `common/GameConstants.java`:
+##
+##     getSensorRadiusPollutionCoefficient(p) = (float)(1.0 / Math.pow(1.0 + p/4000.0, 2))
+##     getCooldownPollutionCoefficient(p)     = (float)(1.0 + p/2000.0)
+##
+## Both are computed in `double` and narrowed to `float` on return, exactly as
+## Java does; `Math.pow(x, 2)` is bit-identical to `x * x` over the whole
+## integer domain `p in [0, 65535]` (checked against the JDK by the
+## `parity-oracle` job's coefficient step, which is BLOCKING), so the closed
+## form here needs no `pow` and therefore no libm.
+##
+## The per-robot local effect registry lives in `world.nim`, because it is
+## world state; this module is pure arithmetic so `world.nim` can import it.
+
+import std/math
+
+func javaRoundF32*(x: float32): int =
+  ## `Math.round(float)` — `(int)floor(a + 0.5f)`, with Java's saturating
+  ## behaviour at the extremes. Used for the sensed radius and for the
+  ## pollution reading, both of which are `Math.round` of a `float` in the
+  ## engine.
+  if x != x: return 0                      # NaN rounds to 0 in Java
+  let shifted = floor(float64(x) + 0.5)
+  if shifted >= 2147483647.0: return 2147483647
+  if shifted <= -2147483648.0: return -2147483648
+  int(shifted)
+
+func sensorCoefficient*(pollution: int): float32 =
+  let base = 1.0 + float64(pollution) / 4000.0
+  float32(1.0 / (base * base))
+
+func cooldownCoefficient*(pollution: int): float32 =
+  float32(1.0 + float64(pollution) / 2000.0)
diff --git a/src/battlecode/years/bc20/rules.nim b/src/battlecode/years/bc20/rules.nim
new file mode 100644
index 0000000..2bd6a0b
--- /dev/null
+++ b/src/battlecode/years/bc20/rules.nim
@@ -0,0 +1,231 @@
+## The bc20 round loop, the game, and the outcome.
+##
+## `runRound` mirrors `GameWorld.runRound` step for step, and the step list IS
+## the rules: a re-ordering is a rules change and bumps `GameVersion`
+## (docs/RULES-BC20.md §The round loop).
+##
+##   1. round += 1, both teams gain BASE_INCOME_PER_ROUND
+##   2. every robot's beginning-of-round (a no-op in 2020, kept as a named step
+##      because the hash chain and the parity trace are taken around it)
+##   3. iterate the dynamic bodies in SPAWN order, skipping the already dead
+##   4. a BLOCKED robot takes no turn and its cooldown does not decay — but its
+##      pollution effect is still reset
+##   5. beginning of turn: cooldown decay, DecisionOps budget reset
+##   6. run the controller (the team chassis, or the ported cow provider)
+##   7. end of turn: clear pollution, refine, vaporate, re-install pollution
+##   8. end of round: mint the block, raise the water, flood one ring, check
+##      the end-of-match ladder
+##   9. append this round's state hash
+
+import std/[monotimes, strutils, times]
+import ../../sim_types
+import ../../sheet
+import world, flood, cows, maps, knobs
+import chassis/[kit, boc, scaffold]
+
+export world, flood, maps, knobs, kit
+
+type
+  ChassisKind* = enum
+    ckBowlOfChowder = "bowl-of-chowder"
+    ckExamplefuncsplayer = "examplefuncsplayer"
+
+  GameOutcome20* = object
+    index*: int
+    mapName*: string
+    sideAslot*: int              ## which SEAT plays team A this game
+    roundsPlayed*: int
+    winnerSlot*: int             ## -1 = no winner recorded (abandoned)
+    endReason*: string
+    points*: array[2, int]       ## BY SEAT
+    hashChain*: string
+    roundChains*: string
+    aborted*: bool
+    ## Per-game statistics, BY SEAT. These are the optional year-specific
+    ## siblings in `results.games[]`.
+    hqAlive*: array[2, bool]
+    hqLostRound*: array[2, int]
+    hqLostCause*: array[2, string]
+    soupMined*: array[2, int]
+    soupRefined*: array[2, int]
+    netWorth*: array[2, int]
+    unitsAlive*: array[2, int]
+    unitsBuilt*: array[2, int]
+    minersBuilt*: array[2, int]
+    landscapersBuilt*: array[2, int]
+    dronesBuilt*: array[2, int]
+    vaporatorsBuilt*: array[2, int]
+    netGunsBuilt*: array[2, int]
+    dirtMoved*: array[2, int]
+    dronePickups*: array[2, int]
+    droneWaterDrops*: array[2, int]
+    netGunKills*: array[2, int]
+    transactionsSent*: array[2, int]
+    transactionsMinted*: array[2, int]
+    blockchainSoupSpent*: array[2, int]
+    globalPollutionPeak*: int
+    floodedTilesEnd*: int
+    waterLevelEnd*: float
+
+proc parseChassisKind*(name: string): ChassisKind =
+  ## Anything unrecognised is `bowl-of-chowder`: a seat that says nothing
+  ## useful plays the strong published doctrine, not the deliberately weak
+  ## floor (§Decisions).
+  case name
+  of "examplefuncsplayer", "scaffold", "example": ckExamplefuncsplayer
+  else: ckBowlOfChowder
+
+proc slotOf*(outcome: GameOutcome20, team: Team): int =
+  if team == teamA: outcome.sideAslot else: 1 - outcome.sideAslot
+
+proc newSides*(sheets: array[2, Sheet], chassis: array[2, ChassisKind],
+               sideAslot: int): array[2, Side] =
+  ## `sides[ord(team)]`. Which SEAT is behind team A alternates per game.
+  result[0] = newSide(teamA, sheets[sideAslot].doctrine20)
+  result[1] = newSide(teamB, sheets[1 - sideAslot].doctrine20)
+  for t in 0 .. 1:
+    result[t].applyOpening()
+
+proc runControllerFor*(w: World, sides: array[2, Side],
+                       chassis: array[2, ChassisKind], r: Robot) =
+  if r.kind == rtCow:
+    w.runCow(r)
+    return
+  if r.team == teamNeutral: return
+  let side = sides[ord(r.team)]
+  case chassis[ord(r.team)]
+  of ckBowlOfChowder: w.runBowlOfChowder(side, r)
+  of ckExamplefuncsplayer: w.runScaffold(side, r)
+
+proc runRound*(w: World, sides: array[2, Side],
+               chassis: array[2, ChassisKind]) =
+  w.processBeginningOfRound()
+  ## A SNAPSHOT of the exec order: bodies spawned this round do not act until
+  ## the next one, and bodies that die are skipped rather than compacted out
+  ## from under the iteration (`ObjectInfo.eachDynamicBodyByExecOrder`).
+  let order = w.execOrder
+  for id in order:
+    if id notin w.robotsById: continue
+    let r = w.robotsById[id]
+    if r.blocked:
+      ## Rule 4: no turn, no cooldown decay, but the pollution effect still
+      ## goes (`GameWorld.updateRobot`).
+      if r.kind.canAffectPollution():
+        w.resetPollutionForRobot(r.id)
+      continue
+    w.processBeginningOfTurn(r)
+    if r.dead: continue
+    w.runControllerFor(sides, chassis, r)
+    if r.dead: continue
+    w.processEndOfTurn(r)
+
+  ## Rule 8, in `GameWorld.processEndOfRound`'s own order.
+  w.processBlockchain()
+  let before = floodStageFor(w.waterLevel)
+  w.updateWaterLevel()
+  w.floodfill()
+  let after = floodStageFor(w.waterLevel)
+  if after > before:
+    w.emit("flood_stage", after, w.floodedCount, w.currentRound)
+  w.checkEndOfMatch()
+  if w.hasWinner:
+    w.running = false
+
+  ## Rule 9: the per-round hash chain. Seven per-team values plus three
+  ## globals; a re-derivation that diverged only in one of them would
+  ## otherwise reproduce the chain and report no mismatch (the GV02 lesson).
+  for t in 0 .. 1:
+    w.mixHash(w.stats.soup[t])
+    w.mixHash(w.stats.soupRefined[t])
+    w.mixHash(w.robotCount[t])
+    w.mixHash(w.netWorth(Team(t)))
+    w.mixHash(w.stats.dirtMoved[t])
+    w.mixHash(w.stats.blockchainsSent[t])
+    w.mixHash(if w.stats.destroyedHq[t]: 0 else: 1)
+  w.mixHash(w.globalPollution)
+  w.mixHash(w.floodedCount)
+  ## The water level enters the chain as its float32 BIT PATTERN, split into
+  ## two 16-bit halves: `int(uint32)` traps under wasm32, where `int` is 32
+  ## bits and half the patterns do not fit.
+  let waterBits = cast[uint32](w.waterLevel)
+  w.mixHash(int(waterBits shr 16))
+  w.mixHash(int(waterBits and 0xFFFF'u32))
+
+# ---------------------------------------------------------------------------
+#  One game
+# ---------------------------------------------------------------------------
+
+proc endReasonFor(w: World): string =
+  case w.domination
+  of dfNone: "quantity"
+  else: $w.domination
+
+proc harvest(w: World, outcome: var GameOutcome20) =
+  for team in [teamA, teamB]:
+    let t = ord(team)
+    let slot = outcome.slotOf(team)
+    outcome.hqAlive[slot] = not w.stats.destroyedHq[t]
+    outcome.hqLostRound[slot] = w.hqLostRound[t]
+    outcome.hqLostCause[slot] = w.hqLostCause[t]
+    outcome.soupMined[slot] = w.stats.soupMined[t]
+    outcome.soupRefined[slot] = w.stats.soupRefined[t]
+    outcome.netWorth[slot] = w.netWorth(team)
+    outcome.unitsAlive[slot] = w.robotCount[t]
+    outcome.unitsBuilt[slot] = w.stats.unitsBuilt[t]
+    outcome.minersBuilt[slot] = w.stats.minersBuilt[t]
+    outcome.landscapersBuilt[slot] = w.stats.landscapersBuilt[t]
+    outcome.dronesBuilt[slot] = w.stats.dronesBuilt[t]
+    outcome.vaporatorsBuilt[slot] = w.stats.vaporatorsBuilt[t]
+    outcome.netGunsBuilt[slot] = w.stats.netGunsBuilt[t]
+    outcome.dirtMoved[slot] = w.stats.dirtMoved[t]
+    outcome.dronePickups[slot] = w.stats.dronePickups[t]
+    outcome.droneWaterDrops[slot] = w.stats.droneWaterDrops[t]
+    outcome.netGunKills[slot] = w.stats.netGunKills[t]
+    outcome.transactionsSent[slot] = w.stats.transactionsSent[t]
+    outcome.transactionsMinted[slot] = w.stats.blockchainsSent[t]
+    outcome.blockchainSoupSpent[slot] = w.stats.blockchainSoupSpent[t]
+  outcome.globalPollutionPeak = w.globalPollutionPeak
+  outcome.floodedTilesEnd = w.floodedCount
+  outcome.waterLevelEnd = float(w.waterLevel)
+  let pts = w.gamePoints()
+  outcome.points[outcome.slotOf(teamA)] = pts[0]
+  outcome.points[outcome.slotOf(teamB)] = pts[1]
+  outcome.roundsPlayed = w.currentRound
+  outcome.hashChain = toHex(w.hashChain)
+
+proc playGame*(
+  spec: MapSpec, sheets: array[2, Sheet], chassis: array[2, ChassisKind],
+  index, sideAslot, maxRounds: int, budgetSeconds: int,
+  onRound: proc (w: World, round: int) {.closure.} = nil
+): (World, GameOutcome20) =
+  ## Plays one game to its end, or abandons it when `budgetSeconds` of
+  ## monotonic wall clock elapse. An abandoned game is DISCARDED by the match
+  ## (its `aborted` flag says so); it is never scored half-played.
+  var w = newWorld(spec, maxRounds)
+  var sides = newSides(sheets, chassis, sideAslot)
+  ## `sides` is indexed by TEAM, and `chassis` arrives by SEAT — re-index it
+  ## once here so the round loop never has to.
+  let chassisByTeam = [chassis[sideAslot], chassis[1 - sideAslot]]
+  var outcome = GameOutcome20(
+    index: index, mapName: spec.name, sideAslot: sideAslot, winnerSlot: -1)
+  let started = getMonoTime()
+  let budget = initDuration(seconds = budgetSeconds)
+  while w.running and w.currentRound < maxRounds:
+    runRound(w, sides, chassisByTeam)
+    outcome.roundChains.add(toHex(w.hashChain))
+    if onRound != nil:
+      onRound(w, w.currentRound)
+    if budgetSeconds > 0 and (w.currentRound and 0x1F) == 0 and
+        getMonoTime() - started >= budget:
+      outcome.aborted = true
+      break
+  if outcome.aborted:
+    outcome.endReason = "abandoned"
+    harvest(w, outcome)
+    outcome.winnerSlot = -1
+    return (w, outcome)
+  outcome.endReason = w.endReasonFor()
+  harvest(w, outcome)
+  if w.hasWinner:
+    outcome.winnerSlot = outcome.slotOf(w.winner)
+  (w, outcome)
diff --git a/src/battlecode/years/bc20/world.nim b/src/battlecode/years/bc20/world.nim
new file mode 100644
index 0000000..d458211
--- /dev/null
+++ b/src/battlecode/years/bc20/world.nim
@@ -0,0 +1,998 @@
+## The Battlecode 2020 "Soup" world: state, geometry and every legality rule.
+##
+## A behaviour-for-behaviour port of `battlecode/world/GameWorld.java`,
+## `world/InternalRobot.java`, `world/ObjectInfo.java`, `world/TeamInfo.java`
+## and `world/RobotControllerImpl.java` at commit
+## `7618f6be7d12da39f2e6e25801e578f1fecfbd86` (the last 2020 state), together
+## with the pieces of `common/MapLocation.java` and `common/Direction.java` the
+## rules depend on. The port is the authority at runtime; the Java engine
+## survives only as the `parity-oracle` CI job (docs/PARITY.md).
+##
+## Four things in here look like details and are not:
+##
+## * **Exec order is SPAWN order, not id order.** `ObjectInfo.eachDynamicBodyByExecOrder`
+##   walks `dynamicBodyExecOrder`, an append-on-spawn / remove-on-death list.
+## * **`float32` everywhere the engine says `float`.** `cooldownTurns`, the
+##   water level and both pollution coefficients are Java `float`s; widening
+##   them to `float64` changes which round a robot becomes ready.
+## * **Blocked robots.** A unit held by a delivery drone takes no turn and its
+##   cooldown does NOT decay — but it still has its pollution effect reset.
+## * **The transaction-id RNG is a Java `static` that the engine re-seeds with
+##   the map seed inside `new RobotControllerImpl(...)`** — i.e. on EVERY
+##   spawn, including the two HQs and every cow at map load. That quirk decides
+##   the minting order among equal-fee transactions and is reproduced exactly.
+
+import std/[math, tables]
+
+export tables
+import ../../rng
+import constants, pollution, blockchain
+
+export constants, pollution, blockchain
+
+type
+  Team* = enum
+    teamA = 0
+    teamB = 1
+    teamNeutral = 2
+
+  Dir* = enum
+    ## Ordinals match `common/Direction.java`. `allDirections()` is
+    ## `values()`, so it INCLUDES `CENTER` — which matters in `floodfill`,
+    ## where the centre tile is re-examined (and always skipped, being already
+    ## flooded).
+    dNorth = 0
+    dNortheast
+    dEast
+    dSoutheast
+    dSouth
+    dSouthwest
+    dWest
+    dNorthwest
+    dCenter
+
+  Symmetry* = enum
+    ## `CowControlProvider.MapSymmetry`, in the engine's own candidate order.
+    ## `vertical` flips x, `horizontal` flips y, `rotational` flips both.
+    symVertical = 0
+    symHorizontal = 1
+    symRotational = 2
+
+  Loc* = object
+    x*, y*: int
+
+  Domination* = enum
+    dfNone
+    dfHqDestroyed = "hq_destroyed"
+    dfQuantity = "quantity"
+    dfQuality = "quality"
+    dfBroadcasts = "broadcasts"
+    dfHighestId = "highest_id"
+    dfCoinFlip = "coin_flip"
+
+  InitialBody* = object
+    id*: int
+    team*: Team
+    kind*: RobotKind
+    loc*: Loc
+
+  MapSpec* = object
+    ## One converted `.map20`, as `data/maps/bc20/<name>.json` carries it.
+    name*: string
+    width*, height*: int
+    symmetry*: Symmetry
+    randomSeed*: int
+    initialWater*: int
+    elevation*: seq[int]     ## the `dirt` int array
+    water*: seq[bool]
+    pollution*: seq[int]
+      ## The map's own pollution array. `GameWorld` reads it into a field and
+      ## then never consults it: `getPollution` is derived entirely from the
+      ## global level and the local effect registry. Carried for fidelity.
+    soup*: seq[int]
+    initialBodies*: seq[InitialBody]
+
+  Robot* = ref object
+    id*: int
+    team*: Team
+    kind*: RobotKind
+    loc*: Loc
+    roundsAlive*: int
+    soupCarrying*: int
+    dirtCarrying*: int
+    cooldownTurns*: float32
+    holdingUnit*: bool
+    heldId*: int
+    blocked*: bool
+      ## Held by a delivery drone: no turn, no cooldown decay.
+    opsLeft*: int
+      ## The DecisionOps budget that replaces the JVM bytecode limit.
+    dead*: bool
+
+  LocalPollutionEffect* = object
+    loc*: Loc
+    radiusSquared*: int
+    additive*: int
+    multiplicative*: float32
+
+  TeamStats* = object
+    ## `TeamInfo` plus the per-game counters `results.games[]` reports. The
+    ## engine keeps only the first three; everything else is telemetry and is
+    ## never read by a rule.
+    soup*: array[2, int]
+    destroyedHq*: array[2, bool]
+    blockchainsSent*: array[2, int]
+    soupMined*: array[2, int]
+    soupRefined*: array[2, int]
+    dirtMoved*: array[2, int]
+    unitsBuilt*: array[2, int]
+    minersBuilt*: array[2, int]
+    landscapersBuilt*: array[2, int]
+    dronesBuilt*: array[2, int]
+    vaporatorsBuilt*: array[2, int]
+    netGunsBuilt*: array[2, int]
+    designSchoolsBuilt*: array[2, int]
+    fulfillmentBuilt*: array[2, int]
+    refineriesBuilt*: array[2, int]
+    dronePickups*: array[2, int]
+    droneWaterDrops*: array[2, int]
+    netGunKills*: array[2, int]
+    transactionsSent*: array[2, int]
+    blockchainSoupSpent*: array[2, int]
+
+  World* = ref object
+    map*: MapSpec
+    width*, height*: int
+    currentRound*: int
+    maxRounds*: int
+    running*: bool
+    idGen*: IdGenerator
+    rand*: JavaRandom
+      ## `GameWorld.rand`, seeded from the map's own `randomSeed`. Replaces
+      ## `setWinnerArbitrary`'s `Math.random()` (docs/RULES-BC20.md §Divergences).
+    txRand*: JavaRandom
+      ## `RobotControllerImpl.random`, a Java `private static Random` that the
+      ## constructor assigns `new Random(gameWorld.getMapSeed())` — so it is
+      ## RE-SEEDED ON EVERY SPAWN. Per-world here so two worlds in one process
+      ## cannot bleed into each other; re-seeded identically.
+    cowRand*: Table[int, JavaRandom]
+    symmetry*: Symmetry
+    elevation*: seq[int]
+    soup*: seq[int]
+    initialSoup*: seq[int]
+    flooded*: seq[bool]
+    floodedCount*: int
+    localAdditive*: seq[int]
+    localMultiplicative*: seq[float32]
+    localPollutions*: Table[int, LocalPollutionEffect]
+    globalPollution*: int
+    globalPollutionPeak*: int
+    waterLevel*: float32
+    occupant*: seq[Robot]
+    robotsById*: Table[int, Robot]
+    execOrder*: seq[int]
+    robotCount*: array[3, int]
+    typeCount*: array[3, array[RobotKind, int]]
+      ## `ObjectInfo.robotTypeCount`. The chassis reads it every turn; deriving
+      ## it by walking `robotsById` per robot turn is O(n^2) per round and
+      ## costs the perf gate.
+    stats*: TeamStats
+    txPool*: seq[Transaction]
+    blockchain*: seq[seq[Transaction]]
+    hqId*: array[2, int]
+    hqLostRound*: array[2, int]
+    hqLostCause*: array[2, string]
+    winner*: Team
+    hasWinner*: bool
+    domination*: Domination
+    ## Replay/telemetry sinks — never read by a rule.
+    events*: seq[tuple[round: int, kind: string, a, b, c: int, s: string]]
+    hashChain*: uint64
+
+const
+  AllDirs* = [dNorth, dNortheast, dEast, dSoutheast,
+              dSouth, dSouthwest, dWest, dNorthwest, dCenter]
+    ## `Direction.allDirections()` == `Direction.values()`, CENTER included.
+  MoveDirs* = [dNorth, dNortheast, dEast, dSoutheast,
+               dSouth, dSouthwest, dWest, dNorthwest]
+    ## `CowControlProvider.DIRECTIONS`, and the eight a unit can move in.
+
+# ---------------------------------------------------------------------------
+#  Geometry
+# ---------------------------------------------------------------------------
+
+func dx*(d: Dir): int =
+  case d
+  of dNorth, dSouth, dCenter: 0
+  of dNortheast, dEast, dSoutheast: 1
+  of dSouthwest, dWest, dNorthwest: -1
+
+func dy*(d: Dir): int =
+  case d
+  of dEast, dWest, dCenter: 0
+  of dNorth, dNortheast, dNorthwest: 1
+  of dSoutheast, dSouth, dSouthwest: -1
+
+func opposite*(d: Dir): Dir =
+  if ord(d) >= 8: d else: Dir((ord(d) + 4) mod 8)
+
+func rotateLeft*(d: Dir): Dir =
+  if ord(d) >= 8: d else: Dir((ord(d) + 7) mod 8)
+
+func rotateRight*(d: Dir): Dir =
+  if ord(d) >= 8: d else: Dir((ord(d) + 1) mod 8)
+
+func loc*(x, y: int): Loc = Loc(x: x, y: y)
+
+func fromDelta*(dx, dy: int): Dir =
+  for d in AllDirs:
+    if d.dx == dx and d.dy == dy:
+      return d
+  dCenter
+func `+`*(a: Loc, d: Dir): Loc = loc(a.x + d.dx, a.y + d.dy)
+func `==`*(a, b: Loc): bool = a.x == b.x and a.y == b.y
+
+func distanceSquaredTo*(a, b: Loc): int =
+  let ddx = a.x - b.x
+  let ddy = a.y - b.y
+  ddx * ddx + ddy * ddy
+
+func isWithinDistanceSquared*(a, b: Loc, r2: int): bool =
+  a.distanceSquaredTo(b) <= r2
+
+func isAdjacentTo*(a, b: Loc): bool =
+  abs(a.x - b.x) <= 1 and abs(a.y - b.y) <= 1
+
+func chebyshev*(a, b: Loc): int =
+  max(abs(a.x - b.x), abs(a.y - b.y))
+
+func directionTo*(a, b: Loc): Dir =
+  ## `MapLocation.directionTo`, ported with the engine's own 2.414 fan.
+  let ddx = float64(b.x - a.x)
+  let ddy = float64(b.y - a.y)
+  if abs(ddx) >= 2.414 * abs(ddy):
+    if ddx > 0: return dEast
+    if ddx < 0: return dWest
+    return dCenter
+  elif abs(ddy) >= 2.414 * abs(ddx):
+    if ddy > 0: return dNorth
+    return dSouth
+  elif ddx > 0:
+    return (if ddy > 0: dNortheast else: dSoutheast)
+  elif ddx < 0:
+    return (if ddy > 0: dNorthwest else: dSouthwest)
+  dCenter
+
+func idx*(w: World, l: Loc): int = l.x + l.y * w.width
+func indexToLoc*(w: World, i: int): Loc = loc(i mod w.width, i div w.width)
+func onTheMap*(w: World, l: Loc): bool =
+  l.x >= 0 and l.y >= 0 and l.x < w.width and l.y < w.height
+
+iterator locationsWithinRadiusSquared*(w: World, center: Loc,
+                                       r2: int): Loc =
+  ## `GameWorld.getAllLocationsWithinRadiusSquared`, in its own x-then-y
+  ## order, with the engine's `ceil(sqrt(r2)) + 1` window.
+  let ceiled = int(ceil(sqrt(float64(max(0, r2))))) + 1
+  let minX = max(center.x - ceiled, 0)
+  let minY = max(center.y - ceiled, 0)
+  let maxX = min(center.x + ceiled, w.width - 1)
+  let maxY = min(center.y + ceiled, w.height - 1)
+  for x in minX .. maxX:
+    for y in minY .. maxY:
+      let l = loc(x, y)
+      if center.isWithinDistanceSquared(l, r2):
+        yield l
+
+# ---------------------------------------------------------------------------
+#  Telemetry
+# ---------------------------------------------------------------------------
+
+proc emit*(w: World, kind: string, a = 0, b = 0, c = 0, s = "") =
+  w.events.add((round: w.currentRound, kind: kind, a: a, b: b, c: c, s: s))
+
+proc mixHash*(w: World, v: int) =
+  ## The per-round hash chain (`coworld-ctf`'s `gameHash` discipline). The
+  ## viewer re-derives every round and compares, exposing `bc_mismatch_round`.
+  w.hashChain = (w.hashChain xor uint64(v and 0xFFFFFFFF)) *
+    0x100000001B3'u64
+
+# ---------------------------------------------------------------------------
+#  Soup, dirt, water, pollution
+# ---------------------------------------------------------------------------
+
+func getSoup*(w: World, l: Loc): int =
+  if w.onTheMap(l): w.soup[w.idx(l)] else: 0
+
+proc removeSoup*(w: World, l: Loc, amount: int) =
+  if w.onTheMap(l):
+    let i = w.idx(l)
+    w.soup[i] = max(0, w.soup[i] - amount)
+
+func getDirt*(w: World, l: Loc): int =
+  ## The engine calls the elevation "dirt". Off-map reads are 0, which is what
+  ## the symmetry detector and every range check rely on.
+  if w.onTheMap(l): w.elevation[w.idx(l)] else: 0
+
+func getDirtDifference*(w: World, a, b: Loc): int =
+  abs(w.getDirt(a) - w.getDirt(b))
+
+func getPollution*(w: World, l: Loc): int =
+  if not w.onTheMap(l): return 0
+  let i = w.idx(l)
+  javaRoundF32(float32(float32(w.globalPollution + w.localAdditive[i]) *
+                       w.localMultiplicative[i]))
+
+proc addGlobalPollution*(w: World, amount: int) =
+  w.globalPollution = max(w.globalPollution + amount, 0)
+  w.globalPollutionPeak = max(w.globalPollutionPeak, w.globalPollution)
+
+proc addLocalPollution*(w: World, robotId: int, l: Loc, r2, additive: int,
+                        multiplicative: float32) =
+  w.localPollutions[robotId] = LocalPollutionEffect(
+    loc: l, radiusSquared: r2, additive: additive,
+    multiplicative: multiplicative)
+  for affected in w.locationsWithinRadiusSquared(l, r2):
+    let i = w.idx(affected)
+    w.localAdditive[i] += additive
+    w.localMultiplicative[i] = w.localMultiplicative[i] * multiplicative
+
+proc resetPollutionForRobot*(w: World, robotId: int) =
+  if robotId notin w.localPollutions:
+    return
+  let e = w.localPollutions[robotId]
+  for affected in w.locationsWithinRadiusSquared(e.loc, e.radiusSquared):
+    let i = w.idx(affected)
+    w.localAdditive[i] -= e.additive
+    w.localMultiplicative[i] = w.localMultiplicative[i] / e.multiplicative
+  w.localPollutions.del(robotId)
+
+func isFlooded*(w: World, l: Loc): bool =
+  if w.onTheMap(l): w.flooded[w.idx(l)] else: false
+
+func getRobot*(w: World, l: Loc): Robot =
+  if w.onTheMap(l): w.occupant[w.idx(l)] else: nil
+
+proc destroyRobot*(w: World, id: int)
+
+proc setFloodStatus*(w: World, i: int, newStatus: bool) =
+  if w.flooded[i] == newStatus:
+    return
+  w.flooded[i] = newStatus
+  w.floodedCount += (if newStatus: 1 else: -1)
+  let victim = w.occupant[i]
+  if newStatus and victim != nil and victim.kind != rtDeliveryDrone:
+    w.destroyRobot(victim.id)
+
+proc tryResurface*(w: World, l: Loc) =
+  ## `GameWorld.tryResurface`: `dirt[idx] >= waterLevel` un-floods the tile,
+  ## the moment a deposit lifts it above the water. `int >= float` widens the
+  ## elevation to `float`, exactly as Java does.
+  let i = w.idx(l)
+  if float32(w.elevation[i]) >= w.waterLevel:
+    w.setFloodStatus(i, false)
+
+# ---------------------------------------------------------------------------
+#  Robot bookkeeping
+# ---------------------------------------------------------------------------
+
+func isBuilding*(kind: RobotKind): bool =
+  kind in {rtHq, rtRefinery, rtVaporator, rtDesignSchool,
+           rtFulfillmentCenter, rtNetGun}
+
+func canRefine*(kind: RobotKind): bool = kind in {rtHq, rtRefinery}
+func canAffectPollution*(kind: RobotKind): bool =
+  kind in {rtHq, rtRefinery, rtVaporator, rtCow}
+func canMoveKind*(kind: RobotKind): bool =
+  kind in {rtMiner, rtLandscaper, rtDeliveryDrone, rtCow}
+func canFly*(kind: RobotKind): bool = kind == rtDeliveryDrone
+func canDig*(kind: RobotKind): bool = kind == rtLandscaper
+func canMine*(kind: RobotKind): bool = kind == rtMiner
+func canShootKind*(kind: RobotKind): bool = kind in {rtNetGun, rtHq}
+func canBeShot*(kind: RobotKind): bool = kind == rtDeliveryDrone
+func canBePickedUp*(kind: RobotKind): bool =
+  kind in {rtMiner, rtLandscaper, rtCow}
+func canPickUpUnits*(kind: RobotKind): bool = kind == rtDeliveryDrone
+
+func canBuildKind*(builder, target: RobotKind): bool =
+  ## `RobotType.canBuild` == `this == type.spawnSource`.
+  case target
+  of rtMiner: builder == rtHq
+  of rtRefinery, rtVaporator, rtDesignSchool, rtFulfillmentCenter, rtNetGun:
+    builder == rtMiner
+  of rtLandscaper: builder == rtDesignSchool
+  of rtDeliveryDrone: builder == rtFulfillmentCenter
+  else: false
+
+func spec*(r: Robot): RobotSpec = RobotSpecs[r.kind]
+
+func currentSensorRadiusSquared*(w: World, r: Robot): int =
+  javaRoundF32(float32(float32(RobotSpecs[r.kind].sensorRadiusSquared) *
+                       sensorCoefficient(w.getPollution(r.loc))))
+
+func canSenseLocation*(w: World, r: Robot, l: Loc): bool =
+  r.loc.distanceSquaredTo(l) <= w.currentSensorRadiusSquared(r)
+
+func isReady*(r: Robot): bool = r.cooldownTurns < 1.0'f32
+
+proc addCooldownTurns*(w: World, r: Robot) =
+  r.cooldownTurns = r.cooldownTurns +
+    RobotSpecs[r.kind].actionCooldown * cooldownCoefficient(w.getPollution(r.loc))
+
+proc addRobotAt(w: World, l: Loc, r: Robot) =
+  w.occupant[w.idx(l)] = r
+
+proc removeRobotAt(w: World, l: Loc) =
+  w.occupant[w.idx(l)] = nil
+
+proc addDirt*(w: World, l: Loc, amount: int)
+
+proc addDirtCarrying*(w: World, r: Robot, amount: int) =
+  ## `InternalRobot.addDirtCarrying`: a BUILDING whose accumulated dirt reaches
+  ## its `dirtLimit` (HQ 50, every other building 15) is destroyed on the spot.
+  r.dirtCarrying += amount
+  if r.kind.isBuilding() and r.dirtCarrying >= RobotSpecs[r.kind].dirtLimit:
+    if r.kind == rtHq and r.team != teamNeutral:
+      w.hqLostCause[ord(r.team)] = "buried"
+    w.destroyRobot(r.id)
+
+proc removeDirt*(w: World, l: Loc) =
+  ## `GameWorld.removeDirt`: dirt comes off a DIRTY BUILDING if one stands
+  ## there, otherwise off the ground. There is no `tryResurface` here — digging
+  ## a tile down never un-floods it.
+  if not w.onTheMap(l): return
+  let target = w.getRobot(l)
+  if target != nil and target.kind.isBuilding() and target.dirtCarrying > 0:
+    target.dirtCarrying = max(0, target.dirtCarrying - 1)
+  else:
+    w.elevation[w.idx(l)] -= 1
+
+proc addDirt*(w: World, l: Loc, amount: int) =
+  ## `GameWorld.addDirt`: onto a BUILDING if one stands there, otherwise onto
+  ## the ground, and then `tryResurface`.
+  if not w.onTheMap(l): return
+  let target = w.getRobot(l)
+  if target != nil and target.kind.isBuilding():
+    w.addDirtCarrying(target, amount)
+  else:
+    w.elevation[w.idx(l)] += amount
+    w.tryResurface(l)
+
+# ---------------------------------------------------------------------------
+#  Spawning and destruction
+# ---------------------------------------------------------------------------
+
+proc recomputeSymmetry*(w: World): Symmetry =
+  ## `CowControlProvider.getSymmetry`, ported literally: candidates in the
+  ## order [vertical, horizontal, rotational], each eliminated by the first
+  ## tile where soup, elevation or robot TYPE disagrees under that transform,
+  ## first survivor wins, `rotational` when none survives.
+  var possible = @[symVertical, symHorizontal, symRotational]
+
+  proc symX(w: World, x: int, s: Symmetry): int =
+    if s == symHorizontal: x else: w.width - 1 - x
+  proc symY(w: World, y: int, s: Symmetry): int =
+    if s == symVertical: y else: w.height - 1 - y
+
+  for x in 0 ..< w.width:
+    for y in 0 ..< w.height:
+      let here = loc(x, y)
+      let bot = w.getRobot(here)
+      for i in countdown(possible.high, 0):
+        if i > possible.high: continue
+        let s = possible[i]
+        let there = loc(w.symX(x, s), w.symY(y, s))
+        var drop = false
+        if w.getSoup(here) != w.getSoup(there): drop = true
+        if w.getDirt(here) != w.getDirt(there): drop = true
+        let other = w.getRobot(there)
+        if bot != nil or other != nil:
+          if bot == nil or other == nil or bot.kind != other.kind:
+            drop = true
+        if drop:
+          possible.delete(i)
+      if possible.len <= 1: break
+    if possible.len <= 1: break
+  if possible.len > 0: possible[0] else: symRotational
+
+proc spawnRobot*(w: World, id: int, kind: RobotKind, l: Loc,
+                 team: Team): int {.discardable.} =
+  ## `GameWorld.spawnRobot`. Three side effects are load-bearing:
+  ##  * the new body is APPENDED to the exec order;
+  ##  * `new RobotControllerImpl(...)` re-seeds the static transaction RNG with
+  ##    the map seed;
+  ##  * `controlProvider.robotSpawned` recomputes the map symmetry — but only
+  ##    for the NEUTRAL provider (`TeamControlProvider` delegates by team), so
+  ##    only a COW spawn moves it. Cows only exist at map load, which is why the
+  ##    symmetry is fixed for the whole match.
+  w.txRand = initJavaRandom(w.map.randomSeed)
+  let r = Robot(id: id, team: team, kind: kind, loc: l, heldId: -1)
+  w.robotsById[id] = r
+  w.execOrder.add(id)
+  w.robotCount[ord(team)] += 1
+  w.typeCount[ord(team)][kind] += 1
+  w.addRobotAt(l, r)
+  if kind == rtHq and team != teamNeutral:
+    w.hqId[ord(team)] = id
+  if team == teamNeutral:
+    w.symmetry = w.recomputeSymmetry()
+  id
+
+proc spawnRobot*(w: World, kind: RobotKind, l: Loc,
+                 team: Team): int {.discardable.} =
+  w.spawnRobot(w.idGen.nextId(), kind, l, team)
+
+proc dropHeldUnit*(w: World, drone: Robot, target: Loc)
+
+proc destroyRobot*(w: World, id: int) =
+  ## `GameWorld.destroyRobot`, in its own order: off the grid, HQ flag, drop a
+  ## carried unit at the drone's own tile, spill carried dirt, clear pollution.
+  var r: Robot
+  if not w.robotsById.pop(id, r):
+    return
+  r.dead = true
+  w.removeRobotAt(r.loc)
+  if r.kind == rtHq and r.team != teamNeutral:
+    w.stats.destroyedHq[ord(r.team)] = true
+    if w.hqLostRound[ord(r.team)] < 0:
+      w.hqLostRound[ord(r.team)] = w.currentRound
+      if w.hqLostCause[ord(r.team)] == "none":
+        w.hqLostCause[ord(r.team)] = "drowned"
+  if r.kind.canPickUpUnits() and r.holdingUnit:
+    w.dropHeldUnit(r, r.loc)
+  if r.dirtCarrying > 0:
+    w.addDirt(r.loc, r.dirtCarrying)
+  if r.kind.canAffectPollution():
+    w.resetPollutionForRobot(id)
+  w.robotCount[ord(r.team)] -= 1
+  w.typeCount[ord(r.team)][r.kind] -= 1
+  let i = w.execOrder.find(id)
+  if i >= 0: w.execOrder.delete(i)
+  w.emit("died", id, ord(r.team), ord(r.kind))
+
+# ---------------------------------------------------------------------------
+#  Rule 6 — the legal actions, with their exact preconditions
+# ---------------------------------------------------------------------------
+
+func isLocationOccupied*(w: World, l: Loc): bool =
+  w.getRobot(l) != nil
+
+proc canMove*(w: World, r: Robot, d: Dir): bool =
+  let target = r.loc + d
+  if not r.kind.canMoveKind(): return false
+  if not r.loc.isAdjacentTo(target): return false
+  if not w.onTheMap(target): return false
+  if w.isLocationOccupied(target): return false
+  if w.getDirtDifference(r.loc, target) > MaxDirtDifference and
+      not r.kind.canFly(): return false
+  isReady(r)
+
+proc movePickedUpUnit(w: World, drone: Robot, center: Loc) =
+  if drone.heldId in w.robotsById:
+    w.robotsById[drone.heldId].loc = center
+
+proc move*(w: World, r: Robot, d: Dir) =
+  ## `RobotControllerImpl.move`. The engine checks the destination for flooding
+  ## AFTER the legality assert and disintegrates the mover — a non-flying unit
+  ## that walks into water dies instead of moving.
+  let center = r.loc + d
+  if not w.canMove(r, d): return
+  if w.isFlooded(center) and not r.kind.canFly():
+    w.destroyRobot(r.id)
+    return
+  w.addCooldownTurns(r)
+  w.removeRobotAt(r.loc)
+  w.addRobotAt(center, r)
+  r.loc = center
+  if r.holdingUnit:
+    w.movePickedUpUnit(r, center)
+
+proc canBuildRobot*(w: World, r: Robot, kind: RobotKind, d: Dir): bool =
+  let spawnLoc = r.loc + d
+  if not r.kind.canBuildKind(kind): return false
+  if r.team == teamNeutral: return false
+  if w.stats.soup[ord(r.team)] < RobotSpecs[kind].cost: return false
+  if not w.onTheMap(spawnLoc): return false
+  if w.isLocationOccupied(spawnLoc): return false
+  if w.isFlooded(spawnLoc) and kind != rtDeliveryDrone: return false
+  if kind != rtDeliveryDrone and
+      w.getDirtDifference(r.loc, spawnLoc) > MaxDirtDifference: return false
+  isReady(r)
+
+proc countBuilt(w: World, team: Team, kind: RobotKind) =
+  let t = ord(team)
+  w.stats.unitsBuilt[t] += 1
+  case kind
+  of rtMiner: w.stats.minersBuilt[t] += 1
+  of rtLandscaper: w.stats.landscapersBuilt[t] += 1
+  of rtDeliveryDrone: w.stats.dronesBuilt[t] += 1
+  of rtVaporator: w.stats.vaporatorsBuilt[t] += 1
+  of rtNetGun: w.stats.netGunsBuilt[t] += 1
+  of rtDesignSchool: w.stats.designSchoolsBuilt[t] += 1
+  of rtFulfillmentCenter: w.stats.fulfillmentBuilt[t] += 1
+  of rtRefinery: w.stats.refineriesBuilt[t] += 1
+  else: discard
+
+proc buildRobot*(w: World, r: Robot, kind: RobotKind, d: Dir): int
+    {.discardable.} =
+  if not w.canBuildRobot(r, kind, d): return -1
+  w.addCooldownTurns(r)
+  w.stats.soup[ord(r.team)] -= RobotSpecs[kind].cost
+  let id = w.spawnRobot(kind, r.loc + d, r.team)
+  w.robotsById[id].cooldownTurns = float32(InitialCooldownTurns)
+  w.countBuilt(r.team, kind)
+  w.emit("built", id, ord(r.team), ord(kind))
+  id
+
+proc canMineSoup*(w: World, r: Robot, d: Dir): bool =
+  let center = r.loc + d
+  if not r.kind.canMine(): return false
+  if r.soupCarrying >= RobotSpecs[r.kind].soupLimit: return false
+  if not w.onTheMap(center): return false
+  if w.getSoup(center) <= 0: return false
+  isReady(r)
+
+proc mineSoup*(w: World, r: Robot, d: Dir) =
+  if not w.canMineSoup(r, d): return
+  w.addCooldownTurns(r)
+  let mineLoc = r.loc + d
+  let mined = min(SoupMiningRate,
+    min(w.getSoup(mineLoc), RobotSpecs[r.kind].soupLimit - r.soupCarrying))
+  w.removeSoup(mineLoc, mined)
+  r.soupCarrying += mined
+  w.stats.soupMined[ord(r.team)] += mined
+
+proc canDepositSoup*(w: World, r: Robot, d: Dir): bool =
+  let center = r.loc + d
+  if r.kind != rtMiner: return false
+  if r.soupCarrying <= 0: return false
+  if not w.onTheMap(center): return false
+  let adjacent = w.getRobot(center)
+  if adjacent == nil or not adjacent.kind.canRefine(): return false
+  isReady(r)
+
+proc depositSoup*(w: World, r: Robot, d: Dir, amount: int) =
+  if not w.canDepositSoup(r, d): return
+  let give = min(amount, r.soupCarrying)
+  w.addCooldownTurns(r)
+  r.soupCarrying = (if give > r.soupCarrying: 0 else: r.soupCarrying - give)
+  w.getRobot(r.loc + d).soupCarrying += give
+
+proc canDigDirt*(w: World, r: Robot, d: Dir): bool =
+  let center = r.loc + d
+  if not r.kind.canDig(): return false
+  if r.dirtCarrying >= RobotSpecs[r.kind].dirtLimit: return false
+  if not w.onTheMap(center): return false
+  let adjacent = w.getRobot(center)
+  if adjacent != nil and adjacent.kind.isBuilding() and
+      adjacent.dirtCarrying <= 0: return false
+  isReady(r)
+
+proc digDirt*(w: World, r: Robot, d: Dir) =
+  if not w.canDigDirt(r, d): return
+  w.addCooldownTurns(r)
+  w.removeDirt(r.loc + d)
+  w.addDirtCarrying(r, 1)
+  w.stats.dirtMoved[ord(r.team)] += 1
+
+proc canDepositDirt*(w: World, r: Robot, d: Dir): bool =
+  let center = r.loc + d
+  if r.kind != rtLandscaper: return false
+  if r.dirtCarrying < 1: return false
+  if not w.onTheMap(center): return false
+  isReady(r)
+
+proc depositDirt*(w: World, r: Robot, d: Dir) =
+  if not w.canDepositDirt(r, d): return
+  w.addCooldownTurns(r)
+  r.dirtCarrying = max(0, r.dirtCarrying - 1)
+  w.addDirt(r.loc + d, 1)
+  w.stats.dirtMoved[ord(r.team)] += 1
+
+proc canPickUpUnit*(w: World, r: Robot, id: int): bool =
+  if not r.kind.canPickUpUnits(): return false
+  if r.holdingUnit: return false
+  if id notin w.robotsById: return false
+  let target = w.robotsById[id]
+  if not target.kind.canBePickedUp(): return false
+  if not target.loc.isWithinDistanceSquared(r.loc,
+      DeliveryDronePickupRadiusSquared): return false
+  if target.blocked: return false
+  isReady(r)
+
+proc pickUpUnit*(w: World, r: Robot, id: int) =
+  if not w.canPickUpUnit(r, id): return
+  let target = w.robotsById[id]
+  target.blocked = true
+  w.removeRobotAt(target.loc)
+  r.holdingUnit = true
+  r.heldId = id
+  target.loc = r.loc
+  w.addCooldownTurns(r)
+  w.stats.dronePickups[ord(r.team)] += 1
+  w.emit("pickup", r.id, ord(r.team), id)
+
+proc canDropUnit*(w: World, r: Robot, d: Dir): bool =
+  let center = r.loc + d
+  if not r.kind.canPickUpUnits(): return false
+  if not r.holdingUnit: return false
+  if not w.onTheMap(center): return false
+  if w.isLocationOccupied(center): return false
+  isReady(r)
+
+proc dropHeldUnit*(w: World, drone: Robot, target: Loc) =
+  ## `dropUnit(dir, checkConditions=false)`: the unconditional drop a dying
+  ## drone performs onto its own tile. A non-drone dropped into water is
+  ## destroyed immediately.
+  let id = drone.heldId
+  if id notin w.robotsById:
+    drone.holdingUnit = false
+    drone.heldId = -1
+    return
+  let dropped = w.robotsById[id]
+  dropped.blocked = false
+  dropped.loc = target
+  drone.holdingUnit = false
+  drone.heldId = -1
+  w.addRobotAt(target, dropped)
+  if w.isFlooded(target):
+    if dropped.team != drone.team and drone.team != teamNeutral:
+      w.stats.droneWaterDrops[ord(drone.team)] += 1
+    w.emit("drone_water_drop", drone.id, ord(drone.team), ord(dropped.kind))
+    w.destroyRobot(id)
+
+proc dropUnit*(w: World, r: Robot, d: Dir) =
+  if not w.canDropUnit(r, d): return
+  let target = r.loc + d
+  let id = r.heldId
+  let dropped = w.robotsById.getOrDefault(id)
+  dropped.blocked = false
+  dropped.loc = target
+  r.holdingUnit = false
+  r.heldId = -1
+  w.addRobotAt(target, dropped)
+  w.addCooldownTurns(r)
+  if w.isFlooded(target):
+    if dropped.team != r.team and r.team != teamNeutral:
+      w.stats.droneWaterDrops[ord(r.team)] += 1
+    w.emit("drone_water_drop", r.id, ord(r.team), ord(dropped.kind))
+    w.destroyRobot(id)
+
+proc canShootUnit*(w: World, r: Robot, id: int): bool =
+  if not r.kind.canShootKind(): return false
+  if id notin w.robotsById: return false
+  let target = w.robotsById[id]
+  if not target.kind.canBeShot(): return false
+  if not target.loc.isWithinDistanceSquared(r.loc,
+      NetGunShootRadiusSquared): return false
+  isReady(r)
+
+proc shootUnit*(w: World, r: Robot, id: int) =
+  if not w.canShootUnit(r, id): return
+  w.destroyRobot(id)
+  w.addCooldownTurns(r)
+  if r.team != teamNeutral:
+    w.stats.netGunKills[ord(r.team)] += 1
+  w.emit("net_gun_kill", r.id, ord(r.team), id)
+
+proc canSubmitTransaction*(w: World, r: Robot, cost: int): bool =
+  ## NOT an action: no cooldown, no `isReady` check. `message.length == 7` is
+  ## a type invariant here.
+  if r.team == teamNeutral: return false
+  if w.stats.soup[ord(r.team)] < cost: return false
+  cost > 0
+
+proc submitTransaction*(w: World, r: Robot,
+                        message: array[TransactionLength, int], cost: int) =
+  if not canSubmitTransaction(w, r, cost): return
+  let t = ord(r.team)
+  w.stats.soup[t] -= cost
+  w.stats.blockchainSoupSpent[t] += cost
+  w.stats.transactionsSent[t] += 1
+  let id = w.txRand.nextInt()
+  w.txPool.add(newTransaction(cost, message, id, t))
+
+proc getBlock*(w: World, roundNumber: int): seq[Transaction] =
+  if roundNumber <= 0 or roundNumber >= w.currentRound: return @[]
+  if roundNumber - 1 >= w.blockchain.len: return @[]
+  w.blockchain[roundNumber - 1]
+
+# ---------------------------------------------------------------------------
+#  The end-of-match ladder, in the engine's own order
+# ---------------------------------------------------------------------------
+
+proc setWinner*(w: World, t: Team, d: Domination) =
+  w.winner = t
+  w.hasWinner = true
+  w.domination = d
+
+func netWorth*(w: World, team: Team): int =
+  result = w.stats.soup[ord(team)]
+  for _, r in w.robotsById:
+    if r.team == team:
+      result += RobotSpecs[r.kind].cost
+
+func livingUnits*(w: World, team: Team): int = w.robotCount[ord(team)]
+
+proc setWinnerIfHqDestroyed*(w: World): bool =
+  let a = w.stats.destroyedHq[0]
+  let b = w.stats.destroyedHq[1]
+  if a and not b:
+    w.setWinner(teamB, dfHqDestroyed); true
+  elif b and not a:
+    w.setWinner(teamA, dfHqDestroyed); true
+  else: false
+
+proc setWinnerIfQuantity*(w: World): bool =
+  let a = w.robotCount[0]
+  let b = w.robotCount[1]
+  if b > a: w.setWinner(teamB, dfQuantity); true
+  elif a > b: w.setWinner(teamA, dfQuantity); true
+  else: false
+
+proc setWinnerIfQuality*(w: World): bool =
+  let a = w.netWorth(teamA)
+  let b = w.netWorth(teamB)
+  if a > b: w.setWinner(teamA, dfQuality); true
+  elif b > a: w.setWinner(teamB, dfQuality); true
+  else: false
+
+proc setWinnerIfMoreBroadcasts*(w: World): bool =
+  let a = w.stats.blockchainsSent[0]
+  let b = w.stats.blockchainsSent[1]
+  if a > b: w.setWinner(teamA, dfBroadcasts); true
+  elif b > a: w.setWinner(teamB, dfBroadcasts); true
+  else: false
+
+proc setWinnerHighestRobotId*(w: World): bool =
+  var best = -1
+  var bestTeam = teamNeutral
+  for id, r in w.robotsById:
+    if r.team != teamNeutral and id > best:
+      best = id
+      bestTeam = r.team
+  if best < 0: return false
+  w.setWinner(bestTeam, dfHighestId)
+  true
+
+proc setWinnerArbitrary*(w: World) =
+  ## `setWinnerArbitrary` uses `Math.random()`, which is wall-clock seeded and
+  ## therefore not reproducible. A draw from the WORLD RNG replaces it — a
+  ## documented divergence, reachable only when neither team has a single
+  ## living robot (docs/RULES-BC20.md §Divergences).
+  w.setWinner((if w.rand.nextDouble() < 0.5: teamA else: teamB), dfCoinFlip)
+
+func timeLimitReached*(w: World): bool =
+  ## `GameWorld.timeLimitReached` is `currentRound >= rounds - 1`, so a
+  ## 1500-round cap plays 1499. The off-by-one is the engine's.
+  w.currentRound >= w.maxRounds - 1
+
+proc checkEndOfMatch*(w: World) =
+  if not (w.timeLimitReached() or w.stats.destroyedHq[0] or
+          w.stats.destroyedHq[1]):
+    return
+  if w.hasWinner: return
+  if w.setWinnerIfHqDestroyed(): return
+  if w.setWinnerIfQuantity(): return
+  if w.setWinnerIfQuality(): return
+  if w.setWinnerIfMoreBroadcasts(): return
+  if w.setWinnerHighestRobotId(): return
+  w.setWinnerArbitrary()
+
+proc gamePoints*(w: World): array[2, int] =
+  ## `points[t] = int(60*hq_survival + 25*unit_share + 15*net_worth_share)`.
+  ##
+  ## Every share is narrowed through FLOAT32 before the weighted sum and the
+  ## sum is TRUNCATED by the `int()` cast — not for fidelity to Java (this
+  ## formula is ours) but for recorder/re-deriver agreement: the same
+  ## arithmetic runs natively on x86-64 and in wasm32 and must produce the same
+  ## integer. `units` counts BUILDINGS TOO and `worth` includes the team pool,
+  ## because those are exactly what the engine's `quantity` and `quality`
+  ## rungs compare.
+  var hq: array[2, int]
+  for t in 0 .. 1:
+    hq[t] = if w.stats.destroyedHq[t]: 0 else: 1
+  let hqTotal = max(1, hq[0] + hq[1])
+  let units = [w.livingUnits(teamA), w.livingUnits(teamB)]
+  let unitTotal = max(1, units[0] + units[1])
+  let worth = [w.netWorth(teamA), w.netWorth(teamB)]
+  let worthTotal = max(1, worth[0] + worth[1])
+  for t in 0 .. 1:
+    let survival = float32(hq[t]) / float32(hqTotal)
+    let shareU = float32(units[t]) / float32(unitTotal)
+    let shareW = float32(worth[t]) / float32(worthTotal)
+    result[t] = int(60.0'f32 * survival + 25.0'f32 * shareU +
+                    15.0'f32 * shareW)
+
+# ---------------------------------------------------------------------------
+#  Turn scaffolding and construction
+# ---------------------------------------------------------------------------
+
+proc processBeginningOfRound*(w: World) =
+  ## Rule 1 and rule 2. `InternalRobot.processBeginningOfRound` is a no-op in
+  ## 2020; it is kept as a named step because the hash chain and the parity
+  ## trace are taken around it.
+  inc w.currentRound
+  w.stats.soup[0] += BaseIncomePerRound
+  w.stats.soup[1] += BaseIncomePerRound
+
+proc processBeginningOfTurn*(w: World, r: Robot) =
+  ## Rule 5. The cooldown decays and the DecisionOps budget is reset.
+  if r.cooldownTurns > 0:
+    r.cooldownTurns = max(0.0'f32, r.cooldownTurns - 1.0'f32)
+  r.opsLeft = RobotSpecs[r.kind].decisionOps
+
+proc processEndOfTurn*(w: World, r: Robot) =
+  ## Rule 7, in `InternalRobot.processEndOfTurn`'s own order. A refinery's
+  ## local +500 is installed HERE and removed at 7.1 of its own next turn, so
+  ## it lasts exactly one round.
+  if r.kind.canAffectPollution():
+    w.resetPollutionForRobot(r.id)
+  var shouldPollute = false
+  if r.kind.canRefine() and r.soupCarrying > 0:
+    let produced = min(r.soupCarrying, RobotSpecs[r.kind].maxSoupProduced)
+    r.soupCarrying -= produced
+    w.stats.soup[ord(r.team)] += produced
+    w.stats.soupRefined[ord(r.team)] += produced
+    shouldPollute = true
+  if r.kind == rtVaporator:
+    w.stats.soup[ord(r.team)] += RobotSpecs[r.kind].maxSoupProduced
+    shouldPollute = true
+  if r.kind == rtCow:
+    shouldPollute = true
+  if r.kind.canAffectPollution() and shouldPollute:
+    w.addGlobalPollution(RobotSpecs[r.kind].globalPollutionAmount)
+    w.addLocalPollution(r.id, r.loc, RobotSpecs[r.kind].pollutionRadiusSquared,
+      RobotSpecs[r.kind].localPollutionAdditiveEffect,
+      RobotSpecs[r.kind].localPollutionMultiplicativeEffect)
+  r.roundsAlive += 1
+
+proc processBlockchain*(w: World) =
+  ## Rule 8.1. `blockchainsSent` counts MINTED transactions, not submitted
+  ## ones — the `broadcasts` rung of the tiebreak ladder reads it.
+  let block0 = mintBlock(w.txPool, NumberOfTransactionsPerBlock)
+  for t in block0:
+    w.stats.blockchainsSent[t.team] += 1
+  w.blockchain.add(block0)
+
+proc newWorld*(spec: MapSpec, maxRounds: int): World =
+  let n = spec.width * spec.height
+  result = World(
+    map: spec,
+    width: spec.width,
+    height: spec.height,
+    currentRound: 0,
+    maxRounds: maxRounds,
+    running: true,
+    idGen: initIdGenerator(spec.randomSeed),
+    rand: initJavaRandom(spec.randomSeed),
+    txRand: initJavaRandom(spec.randomSeed),
+    cowRand: initTable[int, JavaRandom](),
+    symmetry: symRotational,
+    elevation: spec.elevation,
+    soup: spec.soup,
+    initialSoup: spec.soup,
+    flooded: spec.water,
+    localAdditive: newSeq[int](n),
+    localMultiplicative: newSeq[float32](n),
+    localPollutions: initTable[int, LocalPollutionEffect](),
+    globalPollution: 0,
+    waterLevel: float32(spec.initialWater),
+    occupant: newSeq[Robot](n),
+    robotsById: initTable[int, Robot](),
+    winner: teamNeutral,
+    domination: dfNone,
+    hashChain: 0xCBF29CE484222325'u64
+  )
+  for i in 0 ..< n:
+    result.localMultiplicative[i] = 1.0'f32
+    if result.flooded[i]: result.floodedCount += 1
+  result.stats.soup[0] = InitialSoup
+  result.stats.soup[1] = InitialSoup
+  result.hqId = [-1, -1]
+  result.hqLostRound = [-1, -1]
+  result.hqLostCause = ["none", "none"]
+  ## `CowControlProvider.matchStarted` computes the symmetry BEFORE any body
+  ## exists; each cow spawn then recomputes it over the populated world.
+  result.symmetry = result.recomputeSymmetry()
+  for body in spec.initialBodies:
+    result.spawnRobot(body.id, body.kind, body.loc, body.team)
diff --git a/src/battlecode/years/bc26/chassis/kit.nim b/src/battlecode/years/bc26/chassis/kit.nim
index 86e765e..be0e3ae 100644
--- a/src/battlecode/years/bc26/chassis/kit.nim
+++ b/src/battlecode/years/bc26/chassis/kit.nim
@@ -10,10 +10,10 @@
 
 import std/tables
 import ../../../rng
-import ../../../sheet
+import ../knobs
 import ../constants, ../world
 
-export sheet, constants, world, rng
+export knobs, constants, world, rng
 
 type
   Brain* = ref object
diff --git a/src/battlecode/years/bc26/knobs.nim b/src/battlecode/years/bc26/knobs.nim
new file mode 100644
index 0000000..b4e59b4
--- /dev/null
+++ b/src/battlecode/years/bc26/knobs.nim
@@ -0,0 +1,248 @@
+## The Battlecode 2026 knob table: the ten `Doctrine` knobs, its defaults, its
+## per-field repair and its plain-words readout — plus the chassis selector,
+## which is NOT one of them.
+##
+## MOVED VERBATIM out of `sheet.nim` when the bc20 year module landed, at the
+## post-D1 state: no bc26 semantics change, the type, the defaults, the ranges
+## and the repair order are the ones on `main`, and `tests/test_sheet.nim` is
+## unchanged. `sheet.nim` is now the year-neutral envelope that dispatches in
+## here.
+
+import std/[json, tables]
+import ../../sheet_common
+
+export sheet_common
+
+type
+  Chassis* = enum
+    chAwu = "awu"
+    chScaffold = "scaffold"
+
+  BackstabPolicy* = enum
+    bpNever = "never"
+    bpWhenAhead = "when_ahead"
+    bpAtRoundN = "at_round_N"
+    bpOnFirstContact = "on_first_contact"
+    bpRetaliateOnly = "retaliate_only"
+
+  CatEngagement* = enum
+    ceAvoid = "avoid"
+    ceOpportunistic = "opportunistic"
+    ceHunt = "hunt"
+    ceFeed = "feed"
+
+  SpawnCurve* = enum
+    scLean = "lean"
+    scSteady = "steady"
+    scSwarm = "swarm"
+
+  DirtWallPolicy* = enum
+    dwNone = "none"
+    dwKingShell = "king_shell"
+    dwChoke = "choke"
+
+  Doctrine* = object
+    ## The 10 doctrine knobs, each with a named site in the chassis
+    ## (docs/RULES.md §The doctrine sheet lists the site per knob), plus the
+    ## chassis selector, which is NOT one of them.
+    chassis*: Chassis
+      ## NOT A KNOB. An LLM doctrine always runs `awu`: `chassis` is absent
+      ## from `KnownKeys` and from the prompt's knob list, so a reply that
+      ## names it is recorded in `unknownFields` and ignored. The only way to
+      ## select `scaffold` is the scripted filler path
+      ## (`PLAYER_SCRIPTED=scaffold` → `baselines.baselineSheet`), which sets
+      ## this field directly rather than through the sheet.
+    backstabPolicy*: BackstabPolicy
+    backstabRound*: int
+    catEngagement*: CatEngagement
+    catTrapBudget*: int
+    ratTrapBudget*: int
+    spawnCurve*: SpawnCurve
+    cheeseFerryRatio*: float
+    kingCountTarget*: int
+    dirtWallPolicy*: DirtWallPolicy
+    throwRatsToFeedCats*: bool
+
+const
+  KnownKeys* = [
+    "backstab_policy", "backstab_round", "cat_engagement",
+    "cat_trap_budget", "rat_trap_budget", "spawn_curve", "cheese_ferry_ratio",
+    "king_count_target", "dirt_wall_policy", "throw_rats_to_feed_cats"
+  ]
+    ## THE LLM-VISIBLE KNOB SURFACE, and the same list the prompt preamble
+    ## prints. `chassis` is deliberately not in it: which bot drives the clan
+    ## is not a strategic choice a cog gets to make, it is which policy the
+    ## operator ran. A reply that sends `chassis` is treated as any other
+    ## unknown key — recorded, ignored, and the clan plays `awu`.
+
+proc defaultDoctrine*(): Doctrine =
+  Doctrine(
+    chassis: chAwu,
+    backstabPolicy: bpRetaliateOnly,
+    backstabRound: 600,
+    catEngagement: ceOpportunistic,
+    catTrapBudget: 40,
+    ratTrapBudget: 60,
+    spawnCurve: scSteady,
+    cheeseFerryRatio: 0.5,
+    kingCountTarget: 3,
+    dirtWallPolicy: dwKingShell,
+    throwRatsToFeedCats: false
+  )
+
+proc parseChassis*(text: string): Chassis =
+  ## The RECORDED chassis, read back on playback. `validate` never reads
+  ## `chassis` — it is not a knob — so the replay's applied sheet is the only
+  ## place the deriver can learn which bot actually drove a clan. Anything
+  ## unrecognised is `awu`, the chassis every LLM doctrine runs.
+  let key = normalizeKey(text)
+  for value in Chassis:
+    if $value == key:
+      return value
+  chAwu
+
+proc applyKnobs*(seen: Table[string, JsonNode],
+                 defaultsApplied: var seq[string]): Doctrine =
+  ## Repair every bounded field to its default and RECORD the repair, so a cog
+  ## always ends the doctrine phase with a playable doctrine.
+  ##
+  ## `chassis` is NOT read here. It is not in `KnownKeys`, so the envelope has
+  ## already recorded it in `unknownFields`; the returned doctrine keeps
+  ## `defaultDoctrine()`'s `awu`, and `decide.nim` logs the seat that tried.
+  result = defaultDoctrine()
+
+  template repair(name: string) =
+    defaultsApplied.add(name)
+
+  # --- chassis is NOT read here --------------------------------------------
+  # It is not in `KnownKeys`, so the loop above has already recorded it in
+  # `unknownFields`; `result.chassis` keeps `defaultDoctrine()`'s
+  # `awu`. `decide.nim` logs the seat that tried.
+
+  # --- backstab_policy / backstab_round ------------------------------------
+  if "backstab_policy" in seen:
+    if seen["backstab_policy"].kind == JString:
+      let text = normalizeKey(seen["backstab_policy"].getStr())
+      var found = false
+      for value in BackstabPolicy:
+        if normalizeKey($value) == text:
+          result.backstabPolicy = value
+          found = true
+      if not found: repair("backstab_policy")
+    else:
+      repair("backstab_policy")
+  if "backstab_round" in seen:
+    let n = readNumber(seen["backstab_round"])
+    if n.ok and n.value >= 1.0 and n.value <= 2000.0:
+      result.backstabRound = int(n.value)
+    else:
+      repair("backstab_round")
+
+  # --- cat_engagement ------------------------------------------------------
+  if "cat_engagement" in seen:
+    if seen["cat_engagement"].kind == JString:
+      let text = normalizeKey(seen["cat_engagement"].getStr())
+      var found = false
+      for value in CatEngagement:
+        if normalizeKey($value) == text:
+          result.catEngagement = value
+          found = true
+      if not found: repair("cat_engagement")
+    else:
+      repair("cat_engagement")
+
+  # --- integer budgets -----------------------------------------------------
+  template intKnob(name: string, field: untyped, lo, hi: int) =
+    if name in seen:
+      let n = readNumber(seen[name])
+      if n.ok and n.value >= float(lo) and n.value <= float(hi):
+        field = int(n.value)
+      else:
+        repair(name)
+
+  intKnob("cat_trap_budget", result.catTrapBudget, 0, 200)
+  intKnob("rat_trap_budget", result.ratTrapBudget, 0, 200)
+  intKnob("king_count_target", result.kingCountTarget, 1, 5)
+
+  # --- spawn_curve ---------------------------------------------------------
+  if "spawn_curve" in seen:
+    if seen["spawn_curve"].kind == JString:
+      let text = normalizeKey(seen["spawn_curve"].getStr())
+      var found = false
+      for value in SpawnCurve:
+        if normalizeKey($value) == text:
+          result.spawnCurve = value
+          found = true
+      if not found: repair("spawn_curve")
+    else:
+      repair("spawn_curve")
+
+  # --- cheese_ferry_ratio --------------------------------------------------
+  if "cheese_ferry_ratio" in seen:
+    let n = readNumber(seen["cheese_ferry_ratio"])
+    if n.ok and n.value >= 0.0 and n.value <= 1.0:
+      result.cheeseFerryRatio = n.value
+    else:
+      repair("cheese_ferry_ratio")
+
+  # --- dirt_wall_policy ----------------------------------------------------
+  if "dirt_wall_policy" in seen:
+    if seen["dirt_wall_policy"].kind == JString:
+      let text = normalizeKey(seen["dirt_wall_policy"].getStr())
+      var found = false
+      for value in DirtWallPolicy:
+        if normalizeKey($value) == text:
+          result.dirtWallPolicy = value
+          found = true
+      if not found: repair("dirt_wall_policy")
+    else:
+      repair("dirt_wall_policy")
+
+  # --- throw_rats_to_feed_cats ---------------------------------------------
+  if "throw_rats_to_feed_cats" in seen:
+    let b = readBool(seen["throw_rats_to_feed_cats"])
+    if b.ok:
+      result.throwRatsToFeedCats = b.value
+    else:
+      repair("throw_rats_to_feed_cats")
+
+proc toJson*(d: Doctrine): JsonNode =
+  %*{
+    "chassis": $d.chassis,
+    "backstab_policy": $d.backstabPolicy,
+    "backstab_round": d.backstabRound,
+    "cat_engagement": $d.catEngagement,
+    "cat_trap_budget": d.catTrapBudget,
+    "rat_trap_budget": d.ratTrapBudget,
+    "spawn_curve": $d.spawnCurve,
+    "cheese_ferry_ratio": d.cheeseFerryRatio,
+    "king_count_target": d.kingCountTarget,
+    "dirt_wall_policy": $d.dirtWallPolicy,
+    "throw_rats_to_feed_cats": d.throwRatsToFeedCats
+  }
+
+proc plainWords*(d: Doctrine): seq[string] =
+  ## The endcard/`#doctrines` readout: the sheet in words a spectator can
+  ## read without knowing the schema.
+  case d.backstabPolicy
+  of bpNever: result.add("never betrays")
+  of bpRetaliateOnly: result.add("retaliates only")
+  of bpWhenAhead: result.add("betrays when ahead")
+  of bpAtRoundN: result.add("betrays at round " & $d.backstabRound)
+  of bpOnFirstContact: result.add("betrays on first contact")
+  case d.catEngagement
+  of ceAvoid: result.add("avoids cats")
+  of ceOpportunistic: result.add("fights cats when handy")
+  of ceHunt: result.add("hunts cats")
+  of ceFeed: result.add("feeds rats to cats")
+  result.add($d.spawnCurve & " spawning")
+  result.add("keeps " & $d.kingCountTarget & " kings")
+  result.add($d.ratTrapBudget & " rat traps")
+  result.add($d.catTrapBudget & " cat traps")
+  result.add($int(d.cheeseFerryRatio * 100) & "% ferrying")
+  case d.dirtWallPolicy
+  of dwNone: result.add("no dirt work")
+  of dwKingShell: result.add("walls its kings in")
+  of dwChoke: result.add("walls the chokepoints")
+  if d.throwRatsToFeedCats:
+    result.add("throws rats to cats")
diff --git a/src/battlecode/years/bc26/rules.nim b/src/battlecode/years/bc26/rules.nim
index 84c6360..cc51ec0 100644
--- a/src/battlecode/years/bc26/rules.nim
+++ b/src/battlecode/years/bc26/rules.nim
@@ -23,7 +23,7 @@ import chassis/[kit, awu, scaffold]
 export world, constants, kit
 
 type
-  GameOutcome* = object
+  GameOutcome26* = object
     index*: int
     mapName*: string
     sideAslot*: int              ## which SEAT plays team A this game
@@ -52,7 +52,7 @@ type
       ## divergent round rather than the game's last.
     aborted*: bool
 
-proc slotOf*(outcome: GameOutcome, team: Team): int =
+proc slotOf*(outcome: GameOutcome26, team: Team): int =
   ## Seat index for a team in this game. Sides alternate per game, so the
   ## mapping is per game, never global.
   if team == teamA: outcome.sideAslot else: 1 - outcome.sideAslot
@@ -118,7 +118,7 @@ proc endReasonFor(w: World): EndReason =
   elif w.numCats == 0 and w.hasWinner: erCatsCleared
   else: erRoundLimit
 
-proc harvest(w: World, clans: array[2, Clan], outcome: var GameOutcome) =
+proc harvest(w: World, clans: array[2, Clan], outcome: var GameOutcome26) =
   for team in [teamA, teamB]:
     let t = ord(team)
     let slot = outcome.slotOf(team)
@@ -145,13 +145,13 @@ proc harvest(w: World, clans: array[2, Clan], outcome: var GameOutcome) =
 proc playGame*(
   spec: MapSpec, sheets: array[2, Sheet], index, sideAslot, maxRounds: int,
   budgetSeconds: int, onRound: proc (w: World, round: int) {.closure.} = nil
-): (World, GameOutcome) =
+): (World, GameOutcome26) =
   ## Plays one game to its end, or abandons it when `budgetSeconds` of
   ## monotonic wall clock elapse. An abandoned game is DISCARDED by the match
   ## (its `aborted` flag says so); it is never scored half-played.
   var w = newWorld(spec, maxRounds)
   let clans = newClans(sheets, sideAslot)
-  var outcome = GameOutcome(
+  var outcome = GameOutcome26(
     index: index, mapName: spec.name, sideAslot: sideAslot,
     winnerSlot: -1, backstabRound: -1, backstabBySlot: -1
   )
diff --git a/src/battlecode/years/dispatch.nim b/src/battlecode/years/dispatch.nim
new file mode 100644
index 0000000..2ff2184
--- /dev/null
+++ b/src/battlecode/years/dispatch.nim
@@ -0,0 +1,262 @@
+## The year boundary: the ONE place the year-neutral machinery meets a year
+## module.
+##
+## `game_config.year` selects a `YearSpec` in `registry.nim`; everything
+## downstream — `match`, `results`, `replay`, `render`, `broadcast`, `decide`,
+## `server` — holds a `Session` from here and never names `years/bc26/…` or
+## `years/bc20/…` itself. Adding 2027 is a new `years/bc27/` directory, one
+## registry line, one variant, and one arm in each `case` below.
+##
+## A `Session` is a Nim object VARIANT, not a `case year: string`: the compiler
+## checks that every year has an arm, so a half-added year does not compile.
+
+import std/[json, strutils]
+import ../sim_types, ../sheet
+import registry
+import bc26/maps as maps26
+import bc26/rules as rules26
+import bc26/world as world26
+import bc20/maps as maps20
+import bc20/rules as rules20
+import bc20/world as world20
+import bc20/chassis/kit as kit20
+export rules20.ChassisKind, rules20.parseChassisKind
+import bc20/flood as flood20
+
+export registry
+
+type
+  YearId* = enum
+    yBc26 = "bc26"
+    yBc20 = "bc20"
+
+  Session* = ref object
+    ## One game in progress, in whichever year's sim. `stepRound` advances it;
+    ## the renderer and the chrome builder read it through the variant.
+    mapName*: string
+    gameIndex*: int
+    sideAslot*: int
+    case year*: YearId
+    of yBc26:
+      w26*: world26.World
+      clans26*: array[2, rules26.Clan]
+    of yBc20:
+      w20*: world20.World
+      sides20*: array[2, kit20.Side]
+      chassis20*: array[2, rules20.ChassisKind]
+
+  GameOutcome* = object
+    ## The YEAR-NEUTRAL per-game outcome. `results.games[]`'s five required
+    ## keys come from the named fields; `stats` carries that year's optional
+    ## siblings, already in SEAT order.
+    index*: int
+    mapName*: string
+    sideAslot*: int
+    roundsPlayed*: int
+    winnerSlot*: int
+    endReason*: string
+    points*: array[2, int]
+    hashChain*: string
+    roundChains*: string
+    aborted*: bool
+    stats*: JsonNode
+
+const Bc20UnitNames* = [
+  "hq", "miner", "refinery", "vaporator", "design_school",
+  "fulfillment_center", "landscaper", "delivery_drone", "net_gun", "cow"
+]
+  ## `RobotKind` ordinals as the replay's `first_build.unit` spells them.
+
+proc yearIdOf*(year: string): YearId =
+  case year.strip().toLowerAscii()
+  of "bc20": yBc20
+  else: yBc26
+
+# ---------------------------------------------------------------------------
+#  Year-neutral map access
+# ---------------------------------------------------------------------------
+
+proc poolNamesFor*(year, pool: string): seq[string] =
+  case yearIdOf(year)
+  of yBc26: maps26.poolNames(pool)
+  of yBc20: maps20.poolNames(pool)
+
+proc drawMapsFor*(year, pool: string, seed, count: int): seq[string] =
+  case yearIdOf(year)
+  of yBc26: maps26.drawMaps(pool, seed, count)
+  of yBc20: maps20.drawMaps(pool, seed, count)
+
+proc sideAslotFor*(year: string, seed, gameIndex: int): int =
+  case yearIdOf(year)
+  of yBc26: maps26.sideAslotFor(seed, gameIndex)
+  of yBc20: maps20.sideAslotFor(seed, gameIndex)
+
+proc mapPathFor*(year, name: string): string =
+  case yearIdOf(year)
+  of yBc26: maps26.mapPath(name)
+  of yBc20: maps20.mapPath(name)
+
+proc mapCardFor*(year, name: string, slot, sideAslot, rounds: int): JsonNode =
+  ## The per-map facts a seat may legitimately know before writing its
+  ## doctrine. Both seats see numerically identical cards; `you_are` is the
+  ## only asymmetry, because every map is symmetric.
+  case yearIdOf(year)
+  of yBc26:
+    let spec = maps26.loadMap(name)
+    %*{
+      "map": spec.name,
+      "width": spec.width,
+      "height": spec.height,
+      "symmetry": ($spec.symmetry).replace("sym", "").toLowerAscii(),
+      "cheese_mines": spec.cheeseMines.len,
+      "cats": spec.catWaypointIds.len,
+      "rounds": rounds,
+      "you_are": (if sideAslot == slot: "A" else: "B")
+    }
+  of yBc20:
+    var card = maps20.mapCard(maps20.loadMap(name), slot, sideAslot)
+    card["rounds"] = %rounds
+    card
+
+# ---------------------------------------------------------------------------
+#  Sessions
+# ---------------------------------------------------------------------------
+
+proc chassisForYear*(year: string, scripted: string):
+    array[2, rules20.ChassisKind] =
+  ## bc20 selects BOTH the reply sheet and the chassis from `PLAYER_SCRIPTED`
+  ## (D1: the chassis is never a sheet field). bc26 keeps its own mapping
+  ## inside `runControllerFor`.
+  discard year
+  discard scripted
+  [rules20.ckBowlOfChowder, rules20.ckBowlOfChowder]
+
+proc newSession*(year: string, mapName: string, sheets: array[2, Sheet],
+                 sideAslot, maxRounds: int,
+                 chassis: array[2, rules20.ChassisKind],
+                 gameIndex = 0): Session =
+  case yearIdOf(year)
+  of yBc26:
+    let spec = maps26.loadMap(mapName)
+    result = Session(year: yBc26, mapName: mapName, sideAslot: sideAslot,
+                     gameIndex: gameIndex)
+    result.w26 = world26.newWorld(spec, maxRounds)
+    result.clans26 = rules26.newClans(sheets, sideAslot)
+  of yBc20:
+    let spec = maps20.loadMap(mapName)
+    result = Session(year: yBc20, mapName: mapName, sideAslot: sideAslot,
+                     gameIndex: gameIndex)
+    result.w20 = world20.newWorld(spec, maxRounds)
+    result.chassis20 = [chassis[sideAslot], chassis[1 - sideAslot]]
+    result.sides20 = rules20.newSides(sheets, chassis, sideAslot)
+
+proc stepRound*(s: Session) =
+  case s.year
+  of yBc26: rules26.runRound(s.w26, s.clans26)
+  of yBc20: rules20.runRound(s.w20, s.sides20, s.chassis20)
+
+proc currentRound*(s: Session): int =
+  case s.year
+  of yBc26: s.w26.currentRound
+  of yBc20: s.w20.currentRound
+
+proc running*(s: Session): bool =
+  case s.year
+  of yBc26: s.w26.running
+  of yBc20: s.w20.running
+
+proc hashChainHex*(s: Session): string =
+  case s.year
+  of yBc26: toHex(s.w26.hashChain)
+  of yBc20: toHex(s.w20.hashChain)
+
+proc mapWidth*(s: Session): int =
+  case s.year
+  of yBc26: s.w26.width
+  of yBc20: s.w20.width
+
+proc mapHeight*(s: Session): int =
+  case s.year
+  of yBc26: s.w26.height
+  of yBc20: s.w20.height
+
+# ---------------------------------------------------------------------------
+#  Playing a game, and converting the year's outcome to the neutral one
+# ---------------------------------------------------------------------------
+
+proc statsJson26(o: rules26.GameOutcome26): JsonNode =
+  %*{
+    "cooperation_at_end": o.cooperationAtEnd,
+    "backstab_round": o.backstabRound,
+    "backstab_by": o.backstabBySlot,
+    "cat_damage": [o.catDamage[0], o.catDamage[1]],
+    "cheese_transferred": [o.cheeseTransferred[0], o.cheeseTransferred[1]],
+    "kings_alive": [o.kingsAlive[0], o.kingsAlive[1]],
+    "kings_built": [o.kingsBuilt[0], o.kingsBuilt[1]],
+    "rats_built": [o.ratsBuilt[0], o.ratsBuilt[1]],
+    "rats_alive": [o.ratsAlive[0], o.ratsAlive[1]],
+    "traps_placed": [o.trapsPlaced[0], o.trapsPlaced[1]],
+    "dirt_placed": [o.dirtPlaced[0], o.dirtPlaced[1]]
+  }
+
+proc statsJson20*(o: rules20.GameOutcome20): JsonNode =
+  %*{
+    "hq_alive": [o.hqAlive[0], o.hqAlive[1]],
+    "hq_lost_round": [o.hqLostRound[0], o.hqLostRound[1]],
+    "hq_lost_cause": [o.hqLostCause[0], o.hqLostCause[1]],
+    "soup_mined": [o.soupMined[0], o.soupMined[1]],
+    "soup_refined": [o.soupRefined[0], o.soupRefined[1]],
+    "net_worth": [o.netWorth[0], o.netWorth[1]],
+    "units_alive": [o.unitsAlive[0], o.unitsAlive[1]],
+    "units_built": [o.unitsBuilt[0], o.unitsBuilt[1]],
+    "miners_built": [o.minersBuilt[0], o.minersBuilt[1]],
+    "landscapers_built": [o.landscapersBuilt[0], o.landscapersBuilt[1]],
+    "drones_built": [o.dronesBuilt[0], o.dronesBuilt[1]],
+    "vaporators_built": [o.vaporatorsBuilt[0], o.vaporatorsBuilt[1]],
+    "net_guns_built": [o.netGunsBuilt[0], o.netGunsBuilt[1]],
+    "dirt_moved": [o.dirtMoved[0], o.dirtMoved[1]],
+    "drone_pickups": [o.dronePickups[0], o.dronePickups[1]],
+    "drone_water_drops": [o.droneWaterDrops[0], o.droneWaterDrops[1]],
+    "net_gun_kills": [o.netGunKills[0], o.netGunKills[1]],
+    "transactions_sent": [o.transactionsSent[0], o.transactionsSent[1]],
+    "transactions_minted": [o.transactionsMinted[0], o.transactionsMinted[1]],
+    "blockchain_soup_spent":
+      [o.blockchainSoupSpent[0], o.blockchainSoupSpent[1]],
+    "global_pollution_peak": o.globalPollutionPeak,
+    "flooded_tiles_end": o.floodedTilesEnd,
+    "water_level_end": o.waterLevelEnd
+  }
+
+proc playGameFor*(
+  year, mapName: string, sheets: array[2, Sheet],
+  chassis: array[2, rules20.ChassisKind],
+  index, sideAslot, maxRounds, budgetSeconds: int
+): (GameOutcome, seq[tuple[round: int, kind: string, a, b, c: int, s: string]]) =
+  ## Plays one game and returns the neutral outcome plus the year's own event
+  ## stream, so `match.nim` can map the beats without knowing the year's world.
+  case yearIdOf(year)
+  of yBc26:
+    let spec = maps26.loadMap(mapName)
+    let (w, o) = rules26.playGame(spec, sheets, index, sideAslot, maxRounds,
+      budgetSeconds)
+    (GameOutcome(index: o.index, mapName: o.mapName, sideAslot: o.sideAslot,
+      roundsPlayed: o.roundsPlayed, winnerSlot: o.winnerSlot,
+      endReason: $o.endReason, points: o.points, hashChain: o.hashChain,
+      roundChains: o.roundChains, aborted: o.aborted,
+      stats: statsJson26(o)), w.events)
+  of yBc20:
+    let spec = maps20.loadMap(mapName)
+    let (w, o) = rules20.playGame(spec, sheets, chassis, index, sideAslot,
+      maxRounds, budgetSeconds)
+    (GameOutcome(index: o.index, mapName: o.mapName, sideAslot: o.sideAslot,
+      roundsPlayed: o.roundsPlayed, winnerSlot: o.winnerSlot,
+      endReason: o.endReason, points: o.points, hashChain: o.hashChain,
+      roundChains: o.roundChains, aborted: o.aborted,
+      stats: statsJson20(o)), w.events)
+
+proc floodTableJson*(): JsonNode =
+  ## The round each integer elevation floods at — the single most important
+  ## fact a bc20 doctrine has to plan around, so it goes in the observation.
+  result = newJObject()
+  for level in 1 .. 7:
+    result[$level] = %flood20.roundWaterReaches(level)
diff --git a/src/battlecode/years/registry.nim b/src/battlecode/years/registry.nim
index eea3b76..81b6b64 100644
--- a/src/battlecode/years/registry.nim
+++ b/src/battlecode/years/registry.nim
@@ -26,16 +26,21 @@ type
 const Years* = [
   YearSpec(id: "bc26", title: "Battlecode 2026 — Uneasy Alliances",
            maxRounds: 2000, pools: @["small", "mixed", "large"],
-           atlas: "atlas")
+           atlas: "atlas"),
+  YearSpec(id: "bc20", title: "Battlecode 2020 — Soup",
+           maxRounds: 1500, pools: @["small", "mixed", "large"],
+           atlas: "atlas_bc20")
 ]
 
 proc yearSpec*(id: string): YearSpec =
   for spec in Years:
     if spec.id == id.strip().toLowerAscii():
       return spec
+  var known: seq[string]
+  for spec in Years: known.add(spec.id)
   raise newException(ConfigError,
     "unknown game_config.year " & id & "; registered years: " &
-      Years[0].id)
+      known.join(", "))
 
 proc isRegisteredYear*(id: string): bool =
   for spec in Years:
diff --git a/tests/test_determinism.nim b/tests/test_determinism.nim
index 5c9a9ef..cdd1f37 100644
--- a/tests/test_determinism.nim
+++ b/tests/test_determinism.nim
@@ -12,7 +12,7 @@ import battlecode/[baselines, match, replay, results, sheet, sim_types]
 import battlecode/years/bc26/[constants, maps, rules, world]
 
 proc play(mapName: string, sheets: array[2, Sheet], rounds: int,
-          sideAslot = 0): GameOutcome =
+          sideAslot = 0): GameOutcome26 =
   let (w, outcome) = playGame(loadMap(mapName), sheets, 0, sideAslot, rounds, 0)
   outcome
 
@@ -73,7 +73,7 @@ proc deriveAndCompare(config: GameConfig, sheets: array[2, Sheet],
   for slot in 0 .. 1: doc.names[slot] = "seat" & $slot
   for g in games:
     doc.games.add(GameHeader(index: g.index, map: g.mapName,
-      mapSha: mapSha(g.mapName), sideAslot: g.sideAslot,
+      mapSha: mapSha("bc26", g.mapName), sideAslot: g.sideAslot,
       rounds: g.roundsPlayed, hashChain: g.hashChain))
   ## Re-derive from the written bytes, exactly as the wasm viewer does.
   let reparsed = parseReplay($doc.toJson())
@@ -81,7 +81,7 @@ proc deriveAndCompare(config: GameConfig, sheets: array[2, Sheet],
   while deriver.advance(): discard
   (reason, deriver.mismatchRound < 0, games)
 
-var seenReasons: seq[EndReason]
+var seenReasons: seq[string]
 block:
   ## `round_limit`: a short game that neither side can finish.
   var config = defaultGameConfig()
@@ -94,7 +94,7 @@ block:
   check("and re-derives with no hash mismatch", r.ok)
   checkEq("one game was recorded", r.outcomes.len, 1)
   checkEq("and it ended on the round limit", r.outcomes[0].endReason,
-    erRoundLimit)
+    $erRoundLimit)
   seenReasons.add(r.outcomes[0].endReason)
 
 block:
@@ -109,7 +109,7 @@ block:
   check("and re-derives with no hash mismatch", r.ok)
   checkEq("one game was recorded", r.outcomes.len, 1)
   checkEq("and it ended on the kings", r.outcomes[0].endReason,
-    erKingsDestroyed)
+    $erKingsDestroyed)
   seenReasons.add(r.outcomes[0].endReason)
 
 block:
@@ -140,7 +140,7 @@ block:
   checkEq("the cat hunt completes", r.reason, epComplete)
   checkEq("one game was recorded", r.outcomes.len, 1)
   checkEq("and it ended with the cats cleared", r.outcomes[0].endReason,
-    erCatsCleared)
+    $erCatsCleared)
   check("and re-derives with no hash mismatch", r.ok)
   seenReasons.add(r.outcomes[0].endReason)
 
@@ -188,11 +188,11 @@ block:
   var frames = 0
   while deriver.advance(): inc frames
   checkEq("and stops exactly there", frames, stoppedAt)
-  checkEq("at the recorded round", deriver.world.currentRound, stoppedAt)
+  checkEq("at the recorded round", deriver.session.w26.currentRound, stoppedAt)
   checkEq("with no hash mismatch", deriver.mismatchRound, -1)
   ## `abandoned` is the one end reason that never reaches `results.games[]`
   ## (playMatch discards the game); its record -> re-derive is this block.
-  seenReasons.add(erAbandoned)
+  seenReasons.add($erAbandoned)
 
 block:
   ## The scoring of a deadline episode is honest: only the games that
@@ -214,20 +214,20 @@ block:
   var doc = ReplayDoc(gameVersion: GameVersion, year: "bc26",
     config: %*{}, seed: 1, seats: seats, plan: plan,
     result: %*{}, games: @[GameHeader(index: 0, map: "closeup",
-      mapSha: mapSha("closeup"), sideAslot: 0, rounds: outcome.roundsPlayed,
+      mapSha: mapSha("bc26", "closeup"), sideAslot: 0, rounds: outcome.roundsPlayed,
       hashChain: outcome.hashChain)])
   for slot in 0 .. 1: doc.names[slot] = "s" & $slot
   let text = $doc.toJson()
   let deriver = newDeriver(parseReplay(text))
   while deriver.advance(): discard
   checkEq("the re-derived chain matches the recorded one",
-    toHex(deriver.world.hashChain), outcome.hashChain)
+    toHex(deriver.session.w26.hashChain), outcome.hashChain)
   checkEq("and no mismatch round is reported", deriver.mismatchRound, -1)
   ## And once more from the same bytes, to prove the reader is pure.
   let again = newDeriver(parseReplay(text))
   while again.advance(): discard
   checkEq("re-reading the same bytes gives the same chain",
-    toHex(again.world.hashChain), outcome.hashChain)
+    toHex(again.session.w26.hashChain), outcome.hashChain)
 
 # --- EVERY end reason was covered above -------------------------------------
 block:
@@ -235,6 +235,6 @@ block:
   ## every end reason" was a claim no assertion made (r1-N13b). Now the
   ## blocks fill it and this fails if one is ever dropped.
   for reason in EndReason:
-    check("record -> re-derive covered " & $reason, reason in seenReasons)
+    check("record -> re-derive covered " & $reason, $reason in seenReasons)
 
 finish("test_determinism")
diff --git a/tests/test_perf.nim b/tests/test_perf.nim
index d6d90c4..7e05431 100644
--- a/tests/test_perf.nim
+++ b/tests/test_perf.nim
@@ -28,7 +28,7 @@ for name in MixedPool:
     largest = name
 echo "largest map in the bc26 pool: ", largest, " (", largestTiles, " tiles)"
 
-proc timeGame(sheets: array[2, Sheet]): (float, GameOutcome) =
+proc timeGame(sheets: array[2, Sheet]): (float, GameOutcome26) =
   let started = getMonoTime()
   let (w, outcome) = playGame(loadMap(largest), sheets, 0, 0, 2000, 0)
   ((getMonoTime() - started).inMilliseconds.float / 1000.0, outcome)
diff --git a/tests/test_replay.nim b/tests/test_replay.nim
index 679f45f..98cb178 100644
--- a/tests/test_replay.nim
+++ b/tests/test_replay.nim
@@ -10,7 +10,10 @@ proc buildDoc(mapName: string, notes, motto: string): (ReplayDoc, GameOutcome) =
   var sheets = [baselineSheet(blAwu), baselineSheet(blScaffold)]
   sheets[0].notes = notes
   sheets[0].motto = motto
-  let (w, outcome) = playGame(loadMap(mapName), sheets, 0, 0, 500, 0)
+  ## Through the YEAR BOUNDARY, exactly as the server does, so the document
+  ## this test round-trips is the document the server writes.
+  let (outcome, _) = playGameFor("bc26", mapName, sheets,
+    [ckBowlOfChowder, ckBowlOfChowder], 0, 0, 500, 0)
   var plan = MatchPlan(seed: 4242, year: "bc26", maxRounds: 500,
     maps: @[mapName], sideAslots: @[0], abandonAfter: @[-1], sheets: sheets)
   var seats: array[2, SeatReport]
@@ -24,13 +27,13 @@ proc buildDoc(mapName: string, notes, motto: string): (ReplayDoc, GameOutcome) =
     ev("game_end", game = 0, round = outcome.roundsPlayed, fields = %*{
       "winner_alias": aliasFor(max(0, outcome.winnerSlot)),
       "winner_slot": outcome.winnerSlot,
-      "end_reason": $outcome.endReason,
+      "end_reason": outcome.endReason,
       "points": [outcome.points[0], outcome.points[1]]})]
   var doc = ReplayDoc(gameVersion: GameVersion, year: "bc26",
     config: %*{"pool": "small", "seed": 4242}, seed: 4242, seats: seats,
     events: events, plan: plan,
     result: resultsJson(seats, @[outcome], plan, epComplete, 1.0, 2.0),
-    games: @[GameHeader(index: 0, map: mapName, mapSha: mapSha(mapName),
+    games: @[GameHeader(index: 0, map: mapName, mapSha: mapSha("bc26", mapName),
       sideAslot: 0, rounds: outcome.roundsPlayed,
       hashChain: outcome.hashChain, roundChains: outcome.roundChains)])
   for slot in 0 .. 1: doc.names[slot] = seats[slot].name
@@ -127,8 +130,9 @@ block:
   while deriver.advance(): inc frames
   checkEq("the deriver plays every frame", frames, outcome.roundsPlayed)
   checkEq("with no hash mismatch", deriver.mismatchRound, -1)
-  checkEq("and the same final cheese", deriver.world.teamInfo.cheeseTransferred,
-    [outcome.cheeseTransferred[0], outcome.cheeseTransferred[1]])
+  checkEq("and the same final cheese", deriver.session.w26.teamInfo.cheeseTransferred,
+    [outcome.stats["cheese_transferred"][0].getInt(),
+     outcome.stats["cheese_transferred"][1].getInt()])
 
 # --- a mismatching chain is DETECTED, at the round it FIRST diverges --------
 block:
@@ -169,14 +173,14 @@ block:
   let deriver = newDeriver(parseReplay($doc.toJson()))
   ## Frames are 0-based and round `n` is frame `n - 1`.
   deriver.seek(outcome.roundsPlayed div 2)
-  let midway = deriver.world.hashChain
+  let midway = deriver.session.w26.hashChain
   checkEq("a forward seek lands on the right round",
-    deriver.world.currentRound, outcome.roundsPlayed div 2 + 1)
+    deriver.session.w26.currentRound, outcome.roundsPlayed div 2 + 1)
   deriver.seek(10)
   checkEq("a backward seek restarts and replays",
-    deriver.world.currentRound, 11)
+    deriver.session.w26.currentRound, 11)
   deriver.seek(outcome.roundsPlayed div 2)
-  checkEq("and returning gives the same world", deriver.world.hashChain,
+  checkEq("and returning gives the same world", deriver.session.w26.hashChain,
     midway)
 
 # --- the chrome document ----------------------------------------------------
@@ -187,7 +191,7 @@ block:
   discard deriver.advance()
   var view = initViewerState()
   let beats = beatsFor(back, proc (g, r: int): int = 0)
-  let chrome = parseJson(chromeJson(back, deriver.world, view, 0,
+  let chrome = parseJson(chromeJson(back, deriver.session.w26, view, 0,
     deriver.totalFrames, 0, 0, beats, newJArray(), false))
   for key in ["t", "st", "mx", "mt", "sp", "pl", "lp", "sk", "ff", "en",
               "ph", "beats"]:
diff --git a/tests/test_viewer.nim b/tests/test_viewer.nim
index d439e35..682ac7f 100644
--- a/tests/test_viewer.nim
+++ b/tests/test_viewer.nim
@@ -311,7 +311,7 @@ block:
   var doc = ReplayDoc(gameVersion: GameVersion, year: "bc26", config: %*{},
     seed: 9, seats: seats, plan: plan, result: %*{},
     games: @[GameHeader(index: 0, map: "DefaultSmall",
-      mapSha: mapSha("DefaultSmall"), sideAslot: 0,
+      mapSha: mapSha("bc26", "DefaultSmall"), sideAslot: 0,
       rounds: outcome.roundsPlayed, hashChain: outcome.hashChain)])
   for slot in 0 .. 1: doc.names[slot] = "s" & $slot
 
@@ -321,9 +321,9 @@ block:
   var view = initViewerState()
   discard deriver.advance()
   let beats = beatsFor(back, proc (g, r: int): int = 0)
-  let first = renderer.buildPacket(deriver.world, 0, 0,
-    chromeJson(back, deriver.world, view, 0, deriver.totalFrames, 0, 0,
-      beats, newJArray(), false))
+  let first = renderer.buildSessionPacket(deriver.session,
+    sessionChromeJson(back, deriver.session, view, 0, deriver.totalFrames,
+      0, 0, beats, newJArray(), false))
   check("the first frame is a non-empty sprite packet", first.len > 1000)
   ## The first packet must carry the layer, the viewport, the terrain sprite
   ## and the chrome sprite.
@@ -341,7 +341,7 @@ block:
       elif m.sprite.label == "terrain":
         sawTerrain = true
         checkEq("the terrain sprite is the whole board",
-          m.sprite.width, deriver.world.width * render.TileSize)
+          m.sprite.width, deriver.session.w26.width * render.TileSize)
     of spkLayer:
       sawLayer = true
       checkEq("the board layer is zoomable", m.layer.flags, 1)
@@ -356,8 +356,8 @@ block:
 
   for step in 0 ..< 30:
     discard deriver.advance()
-  let later = renderer.buildPacket(deriver.world, 0, 0,
-    chromeJson(back, deriver.world, view, deriver.frame, deriver.totalFrames,
+  let later = renderer.buildSessionPacket(deriver.session,
+    sessionChromeJson(back, deriver.session, view, deriver.frame, deriver.totalFrames,
       0, 0, beats, newJArray(), false))
   check("a later frame is a DIFF, not the whole board", later.len < first.len)
   check("but still carries something to draw", later.len > 16)
diff --git a/tools/JavaWaterLevels.java b/tools/JavaWaterLevels.java
new file mode 100644
index 0000000..577279b
--- /dev/null
+++ b/tools/JavaWaterLevels.java
@@ -0,0 +1,64 @@
+// Regenerates `data/bc20/water_levels.json` — CI-ONLY, never in an image.
+//
+// `GameConstants.getWaterLevel` is
+//
+//     (float)(Math.exp(0.0028*x - 1.38*Math.sin(0.00157*x - 1.73)
+//                      + 1.38*Math.sin(-1.73)) - 1)
+//
+// and `Math.exp` / `Math.sin` are HotSpot INTRINSICS that are not bit-identical
+// to any libm this port would link natively or under emscripten. The function
+// depends only on the round number, so the whole domain is emitted here, once,
+// under the JDK, as float32 BIT PATTERNS, and the sim (native and wasm) reads
+// the committed table. Bit-exact against Java by construction, on every
+// platform, with no libm in the loop.
+//
+//     javac -d /tmp/wl tools/JavaWaterLevels.java
+//     java -cp /tmp/wl JavaWaterLevels > data/bc20/water_levels.json
+//
+// The `parity-oracle` CI job regenerates and byte-diffs this file as a BLOCKING
+// step. The emitted table is also checked against `StrictMath` here, so a JDK
+// whose intrinsics disagree with the reference implementation is reported
+// rather than silently baked in.
+public final class JavaWaterLevels {
+
+    static final int MAX_ROUND = 1500;
+
+    static float waterLevel(int roundNumber) {
+        double x = roundNumber;
+        return (float) (Math.exp(0.0028 * x - 1.38 * Math.sin(0.00157 * x - 1.73)
+                + 1.38 * Math.sin(-1.73)) - 1);
+    }
+
+    static float strictWaterLevel(int roundNumber) {
+        double x = roundNumber;
+        return (float) (StrictMath.exp(0.0028 * x - 1.38 * StrictMath.sin(0.00157 * x - 1.73)
+                + 1.38 * StrictMath.sin(-1.73)) - 1);
+    }
+
+    public static void main(String[] args) {
+        int strictMismatches = 0;
+        StringBuilder out = new StringBuilder();
+        out.append("{\"source\":\"battlecode20 GameConstants.getWaterLevel\",");
+        out.append("\"encoding\":\"float32 bit pattern, 8 hex digits, big-endian\",");
+        out.append("\"max_round\":").append(MAX_ROUND).append(',');
+        out.append("\"levels\":[");
+        for (int r = 0; r <= MAX_ROUND; r++) {
+            float v = waterLevel(r);
+            if (Float.floatToRawIntBits(v) != Float.floatToRawIntBits(strictWaterLevel(r))) {
+                strictMismatches++;
+            }
+            if (r > 0) {
+                out.append(',');
+            }
+            out.append('"');
+            out.append(String.format("%08x", Float.floatToRawIntBits(v)));
+            out.append('"');
+        }
+        out.append("]}\n");
+        System.out.print(out);
+        if (strictMismatches > 0) {
+            System.err.println("WARNING: Math and StrictMath disagree on "
+                    + strictMismatches + " of " + (MAX_ROUND + 1) + " rounds");
+        }
+    }
+}
diff --git a/tools/__pycache__/convert_maps_bc20.cpython-311.pyc b/tools/__pycache__/convert_maps_bc20.cpython-311.pyc
new file mode 100644
index 0000000000000000000000000000000000000000..8e5d7ab557e649d504a6327466b55a3b1ac1286e
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diff --git a/tools/build_sprite_atlas_bc20.py b/tools/build_sprite_atlas_bc20.py
new file mode 100644
index 0000000..189742c
--- /dev/null
+++ b/tools/build_sprite_atlas_bc20.py
@@ -0,0 +1,106 @@
+#!/usr/bin/env python3
+"""Cut `data/atlas_bc20.png` + `data/atlas_bc20.json` from the 2020 client art.
+
+CI-TIME ONLY. The source is `battlecode20/client/visualizer/src/static/img/**`
+at the pinned commit (GPL-3.0, credited in NOTICE); the atlas is COMMITTED so
+the runtime image and the wasm bundle carry no build step and no upstream tree.
+
+    tools/build_sprite_atlas_bc20.py --engine /path/to/battlecode20 --out data
+
+Palette follows the ENGINE SIDE, not the seat: red = side A, blue = side B,
+exactly as the 2020 client draws it. Because sides alternate every game the
+scorebug plate keeps the alias constant and recolours its swatch per game.
+It looks like Battlecode 2020 because it IS Battlecode 2020's art.
+"""
+
+from __future__ import annotations
+
+import argparse
+import json
+import pathlib
+
+from PIL import Image
+
+TILE = 16          # board pixels per map tile in the viewer's native render
+COLUMNS = 8
+
+# sprite name -> file under client/visualizer/src/static/img
+SPRITE_FILES = {
+    "hq_red": "sprites/HQ_red.png",
+    "hq_blue": "sprites/HQ_blue.png",
+    "miner_red": "sprites/Miner_red.png",
+    "miner_blue": "sprites/Miner_blue.png",
+    "landscaper_red": "sprites/Landscaper_red.png",
+    "landscaper_blue": "sprites/Landscaper_blue.png",
+    "drone_red": "sprites/Drone_red.png",
+    "drone_blue": "sprites/Drone_blue.png",
+    "drone_red_carry": "sprites/Drone_red_carry.png",
+    "drone_blue_carry": "sprites/Drone_blue_carry.png",
+    "refinery_red": "sprites/Refinery_red.png",
+    "refinery_blue": "sprites/Refinery_blue.png",
+    "vaporator_red": "sprites/Vaporator_red.png",
+    "vaporator_blue": "sprites/Vaporator_blue.png",
+    # SOUPER_* is the 2020 client's own file name for the Design School.
+    "design_school_red": "sprites/SOUPER_red.png",
+    "design_school_blue": "sprites/SOUPER_blue.png",
+    "fulfillment_center_red": "sprites/Fulfillment_red.png",
+    "fulfillment_center_blue": "sprites/Fulfillment_blue.png",
+    "net_gun_red": "sprites/Net_gun_red.png",
+    "net_gun_blue": "sprites/Net_gun_blue.png",
+    "cow": "sprites/Cow.png",
+    "soup": "soup.png",
+}
+
+
+def cell(img: Image.Image, size: int) -> Image.Image:
+    return img.convert("RGBA").resize((size, size), Image.LANCZOS)
+
+
+def main() -> int:
+    ap = argparse.ArgumentParser()
+    ap.add_argument("--engine", required=True, type=pathlib.Path)
+    ap.add_argument("--out", required=True, type=pathlib.Path)
+    ap.add_argument("--check", action="store_true")
+    args = ap.parse_args()
+
+    img_dir = args.engine / "client/visualizer/src/static/img"
+    sprites: list[tuple[str, Image.Image]] = []
+    for name in sorted(SPRITE_FILES):
+        source = img_dir / SPRITE_FILES[name]
+        if not source.exists():
+            raise SystemExit(f"::error::missing 2020 client sprite: {source}")
+        sprites.append((name, cell(Image.open(source), TILE)))
+
+    width_cell = max(s.width for _, s in sprites)
+    height_cell = max(s.height for _, s in sprites)
+    rows = (len(sprites) + COLUMNS - 1) // COLUMNS
+    atlas = Image.new("RGBA", (COLUMNS * width_cell, rows * height_cell),
+                      (0, 0, 0, 0))
+    index: dict[str, dict[str, int]] = {}
+    for i, (name, sprite) in enumerate(sprites):
+        x = (i % COLUMNS) * width_cell
+        y = (i // COLUMNS) * height_cell
+        atlas.paste(sprite, (x, y))
+        index[name] = {"x": x, "y": y, "w": sprite.width, "h": sprite.height}
+
+    args.out.mkdir(parents=True, exist_ok=True)
+    png = args.out / "atlas_bc20.png"
+    meta = args.out / "atlas_bc20.json"
+    doc = json.dumps({"tile": TILE, "sprites": index},
+                     sort_keys=True, separators=(",", ":")) + "\n"
+
+    if args.check:
+        if not meta.exists() or meta.read_text() != doc:
+            print("atlas_bc20.json differs from a fresh cut of the client art")
+            return 1
+        print("bc20 atlas matches the 2020 client art")
+        return 0
+
+    atlas.save(png, optimize=True)
+    meta.write_text(doc)
+    print(f"wrote {png} ({png.stat().st_size} bytes) and {meta}")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/tools/convert_maps_bc20.py b/tools/convert_maps_bc20.py
new file mode 100644
index 0000000..6378c86
--- /dev/null
+++ b/tools/convert_maps_bc20.py
@@ -0,0 +1,298 @@
+#!/usr/bin/env python3
+"""Convert Battlecode 2020 `.map20` flatbuffers to `data/maps/bc20/<name>.json`.
+
+CI-TIME ONLY. There is no flatbuffer reader, no Python and no JVM in any
+runtime image stage: the sim reads the committed JSON. `tests/test_bc20_maps.nim`
+re-converts and diffs (through `tools/ci/check_bc20_maps.sh`), so a hand-edited
+map file fails the build.
+
+    tools/convert_maps_bc20.py --engine /path/to/battlecode20 --out data/maps/bc20
+    tools/convert_maps_bc20.py --engine ... --out data/maps/bc20 --check
+
+battlecode20 ships no generated Python bindings (only `schema/java`,
+`schema/js` and `schema/ts`), and `flatc` is not available in the coworld
+toolchain, so the four tables this converter needs are read directly off the
+wire with the vtable walk below. The layout is fixed by `schema/battlecode.fbs`
+at the pinned commit and is asserted field by field.
+
+SYMMETRY IS NOT IN THE FILE. The 2020 `.map20` schema has no symmetry field, so
+it is DETECTED exactly the way the engine does in
+`world/control/CowControlProvider.getSymmetry`: candidates in the order
+`vertical`, `horizontal`, `rotational`; each eliminated by the first tile where
+soup, elevation ("dirt") or robot type disagrees under that transform; the first
+survivor wins; `rotational` when none survives. Engine naming: `vertical` flips
+x (`symmetricX = w-1-x`), `horizontal` flips y (`symmetricY = h-1-y`),
+`rotational` flips both.
+"""
+
+from __future__ import annotations
+
+import argparse
+import json
+import pathlib
+import struct
+import sys
+
+# schema/battlecode.fbs `enum BodyType : byte`, in declaration order.
+BODY_TYPES = ["hq", "miner", "refinery", "vaporator", "design_school",
+              "fulfillment_center", "landscaper", "delivery_drone",
+              "net_gun", "cow"]
+# world/TeamMapping.java: 1 -> A, 2 -> B; cows are NEUTRAL (team id 0).
+TEAMS = {0: "neutral", 1: "A", 2: "B"}
+
+
+# ---------------------------------------------------------------------------
+#  A minimal flatbuffer reader (little-endian, as the format mandates)
+# ---------------------------------------------------------------------------
+
+class Buf:
+    def __init__(self, data: bytes) -> None:
+        self.d = data
+
+    def u16(self, at: int) -> int:
+        return struct.unpack_from("<H", self.d, at)[0]
+
+    def i16(self, at: int) -> int:
+        return struct.unpack_from("<h", self.d, at)[0]
+
+    def i32(self, at: int) -> int:
+        return struct.unpack_from("<i", self.d, at)[0]
+
+    def u32(self, at: int) -> int:
+        return struct.unpack_from("<I", self.d, at)[0]
+
+    def i8(self, at: int) -> int:
+        return struct.unpack_from("<b", self.d, at)[0]
+
+
+class Table:
+    """One flatbuffer table: an absolute position plus its vtable."""
+
+    def __init__(self, buf: Buf, pos: int) -> None:
+        self.b = buf
+        self.pos = pos
+        self.vtable = pos - buf.i32(pos)
+        self.vlen = buf.u16(self.vtable)
+
+    def offset(self, field: int) -> int:
+        """Byte offset of field `field` from the table position, 0 if absent."""
+        slot = 4 + field * 2
+        if slot >= self.vlen:
+            return 0
+        return self.b.u16(self.vtable + slot)
+
+    def indirect(self, field: int) -> int | None:
+        o = self.offset(field)
+        if o == 0:
+            return None
+        at = self.pos + o
+        return at + self.b.i32(at)
+
+    def table(self, field: int) -> "Table | None":
+        at = self.indirect(field)
+        return None if at is None else Table(self.b, at)
+
+    def struct_pos(self, field: int) -> int | None:
+        # An inline struct lives AT the field offset, not behind an indirection.
+        o = self.offset(field)
+        return None if o == 0 else self.pos + o
+
+    def scalar_i32(self, field: int, default: int = 0) -> int:
+        o = self.offset(field)
+        return default if o == 0 else self.b.i32(self.pos + o)
+
+    def string(self, field: int) -> str:
+        at = self.indirect(field)
+        if at is None:
+            return ""
+        length = self.b.u32(at)
+        return self.d_slice(at + 4, length).decode("utf-8")
+
+    def d_slice(self, at: int, length: int) -> bytes:
+        return self.b.d[at:at + length]
+
+    def vector(self, field: int) -> tuple[int, int]:
+        """(first element position, element count); (0, 0) when absent."""
+        at = self.indirect(field)
+        if at is None:
+            return (0, 0)
+        return (at + 4, self.b.u32(at))
+
+    def vec_i32(self, field: int) -> list[int]:
+        start, n = self.vector(field)
+        if n == 0:
+            return []
+        return list(struct.unpack_from(f"<{n}i", self.b.d, start))
+
+    def vec_i8(self, field: int) -> list[int]:
+        start, n = self.vector(field)
+        if n == 0:
+            return []
+        return list(struct.unpack_from(f"<{n}b", self.b.d, start))
+
+    def vec_bool(self, field: int) -> list[bool]:
+        start, n = self.vector(field)
+        return [bool(self.b.d[start + i]) for i in range(n)]
+
+
+# GameMap field ids, in `schema/battlecode.fbs` declaration order.
+GM_NAME, GM_MIN, GM_MAX, GM_BODIES = 0, 1, 2, 3
+GM_SEED, GM_DIRT, GM_WATER, GM_POLLUTION, GM_SOUP, GM_INITIAL_WATER = 4, 5, 6, 7, 8, 9
+# SpawnedBodyTable field ids.
+SB_IDS, SB_TEAMS, SB_TYPES, SB_LOCS = 0, 1, 2, 3
+# VecTable field ids.
+VT_XS, VT_YS = 0, 1
+
+
+def detect_symmetry(width: int, height: int, soup: list[int],
+                    dirt: list[int], body_type_at: dict[int, str]) -> str:
+    """`CowControlProvider.getSymmetry`, ported literally.
+
+    The candidate list is scanned x-major then y (the engine's own loop order)
+    and a candidate is dropped at the first disagreeing tile. The engine breaks
+    out of both loops the moment one candidate is left and returns
+    `possible.get(0)`, so the answer is the FIRST SURVIVOR in the declaration
+    order [vertical, horizontal, rotational], defaulting to rotational.
+    """
+    possible = ["vertical", "horizontal", "rotational"]
+
+    def sym_x(x: int, s: str) -> int:
+        return x if s == "horizontal" else width - 1 - x
+
+    def sym_y(y: int, s: str) -> int:
+        return y if s == "vertical" else height - 1 - y
+
+    for x in range(width):
+        for y in range(height):
+            here = x + width * y
+            for s in list(reversed(possible)):
+                there = sym_x(x, s) + width * sym_y(y, s)
+                if soup[here] != soup[there] or dirt[here] != dirt[there]:
+                    possible.remove(s)
+                    continue
+                a = body_type_at.get(here)
+                b = body_type_at.get(there)
+                if (a is not None) or (b is not None):
+                    if a is None or b is None or a != b:
+                        possible.remove(s)
+            if len(possible) <= 1:
+                break
+        if len(possible) <= 1:
+            break
+    return possible[0] if possible else "rotational"
+
+
+def convert(path: pathlib.Path) -> dict:
+    data = path.read_bytes()
+    buf = Buf(data)
+    root_pos = buf.u32(0)
+    gm = Table(buf, root_pos)
+
+    min_pos = gm.struct_pos(GM_MIN)
+    max_pos = gm.struct_pos(GM_MAX)
+    if min_pos is None or max_pos is None:
+        raise SystemExit(f"::error::{path.name}: no minCorner/maxCorner")
+    min_x, min_y = buf.i32(min_pos), buf.i32(min_pos + 4)
+    max_x, max_y = buf.i32(max_pos), buf.i32(max_pos + 4)
+    width, height = max_x - min_x, max_y - min_y
+    size = width * height
+
+    dirt = gm.vec_i32(GM_DIRT)
+    water = gm.vec_bool(GM_WATER)
+    pollution = gm.vec_i32(GM_POLLUTION)
+    soup = gm.vec_i32(GM_SOUP)
+    for label, arr in (("dirt", dirt), ("water", water),
+                       ("pollution", pollution), ("soup", soup)):
+        if len(arr) != size:
+            raise SystemExit(f"::error::{path.name}: {label} array is "
+                             f"{len(arr)}, expected {size}")
+
+    bodies_table = gm.table(GM_BODIES)
+    bodies: list[dict] = []
+    body_type_at: dict[int, str] = {}
+    if bodies_table is not None:
+        ids = bodies_table.vec_i32(SB_IDS)
+        teams = bodies_table.vec_i8(SB_TEAMS)
+        types = bodies_table.vec_i8(SB_TYPES)
+        locs = bodies_table.table(SB_LOCS)
+        xs = locs.vec_i32(VT_XS) if locs is not None else []
+        ys = locs.vec_i32(VT_YS) if locs is not None else []
+        for i, rid in enumerate(ids):
+            kind = BODY_TYPES[types[i]]
+            x, y = xs[i] - min_x, ys[i] - min_y
+            bodies.append({
+                "id": int(rid),
+                "team": TEAMS[int(teams[i])],
+                "type": kind,
+                "x": int(x),
+                "y": int(y),
+            })
+            body_type_at[x + width * y] = kind
+    bodies.sort(key=lambda b: b["id"])
+
+    return {
+        "name": gm.string(GM_NAME),
+        "width": width,
+        "height": height,
+        "symmetry": detect_symmetry(width, height, soup, dirt, body_type_at),
+        "random_seed": gm.scalar_i32(GM_SEED),
+        "initial_water": gm.scalar_i32(GM_INITIAL_WATER),
+        "elevation": dirt,
+        "water": water,
+        "pollution": pollution,
+        "soup": soup,
+        "initial_bodies": bodies,
+    }
+
+
+def render(doc: dict) -> str:
+    # Compact and stable: the committed file is diffed byte for byte in CI, so
+    # the serialisation has to be deterministic.
+    return json.dumps(doc, sort_keys=True, separators=(",", ":")) + "\n"
+
+
+def pool_names() -> list[str]:
+    pools = json.loads(
+        (pathlib.Path(__file__).with_name("map_pools_bc20.json")).read_text())
+    return sorted({n for pool in pools.values() for n in pool})
+
+
+def main() -> int:
+    ap = argparse.ArgumentParser()
+    ap.add_argument("--engine", required=True, type=pathlib.Path,
+                    help="a checkout of github.com/battlecode/battlecode20")
+    ap.add_argument("--out", required=True, type=pathlib.Path)
+    ap.add_argument("--only", nargs="*", default=None)
+    ap.add_argument("--check", action="store_true")
+    args = ap.parse_args()
+
+    map_dir = args.engine / "engine/src/main/battlecode/world/resources"
+    names = args.only or pool_names()
+
+    args.out.mkdir(parents=True, exist_ok=True)
+    drift = []
+    for name in names:
+        source = map_dir / f"{name}.map20"
+        if not source.exists():
+            sys.stderr.write(f"missing map at {args.engine}: {name}\n")
+            return 1
+        text = render(convert(source))
+        target = args.out / f"{name}.json"
+        if args.check:
+            if not target.exists() or target.read_text() != text:
+                drift.append(name)
+        else:
+            target.write_text(text)
+    if args.check:
+        if drift:
+            sys.stderr.write("converted bc20 maps differ from the engine: "
+                             + ", ".join(drift) + "\n")
+            return 1
+        print(f"{len(names)} converted bc20 maps match the engine")
+    else:
+        print(f"wrote {len(names)} maps to {args.out}")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/tools/gen_year_constants.py b/tools/gen_year_constants.py
index dcee29d..2e83acb 100644
--- a/tools/gen_year_constants.py
+++ b/tools/gen_year_constants.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-"""Generate src/battlecode/years/bc26/constants.nim from the pinned engine.
+"""Generate src/battlecode/years/<year>/constants.nim from the pinned engine.
 
 CI-TIME ONLY (Python and a Java *source* checkout; no JVM is involved, and
 neither exists in any runtime image stage). The Battlecode 2026 rule set has
@@ -13,6 +13,13 @@
         --out src/battlecode/years/bc26/constants.nim
     tools/gen_year_constants.py --engine ... --check   # diff, exit 1 on drift
 
+`--year bc20` does the same job for Battlecode 2020 "Soup" against a checkout
+of github.com/battlecode/battlecode20 at the pinned commit, reading
+`common/GameConstants.java` and `common/RobotType.java`:
+
+    tools/gen_year_constants.py --year bc20 --engine /path/to/battlecode20 \
+        --out src/battlecode/years/bc20/constants.nim
+
 The engine checkout is fetched by CI:
     curl -fsSL https://github.com/battlecode/battlecode26/archive/refs/tags/engine.1.2.5.tar.gz
 """
@@ -49,6 +56,14 @@ def nim_literal(java_type: str, raw: str) -> tuple[str, str]:
     text = raw.strip()
     if java_type == "String":
         return "string", text
+    # The 2020 rule set names one constant by a Java expression rather than a
+    # literal: MIN_WATER_ELEVATION = Integer.MIN_VALUE/2. Evaluate the handful
+    # of forms that actually occur rather than hand-typing the value.
+    JAVA_EXPRESSIONS = {
+        "Integer.MIN_VALUE/2": "-1073741824",
+        "Integer.MAX_VALUE/2": "1073741823",
+    }
+    text = JAVA_EXPRESSIONS.get(text.replace(" ", ""), text)
     if re.fullmatch(r"[-+0-9._eE]+[LlFfDd]?", text):
         text = text.rstrip("LlFfDd")
     if java_type == "int":
@@ -60,8 +75,8 @@ def nim_literal(java_type: str, raw: str) -> tuple[str, str]:
     return "float64", repr(float(text))
 
 
-def read_constants(engine: pathlib.Path) -> list[tuple[str, str, str]]:
-    src = (engine / "engine/src/main/battlecode/common/GameConstants.java").read_text()
+def read_constants_from(path: pathlib.Path) -> list[tuple[str, str, str]]:
+    src = path.read_text()
     out = []
     for java_type, name, raw in CONST_RE.findall(src):
         nim_type, literal = nim_literal(java_type, raw)
@@ -69,6 +84,11 @@ def read_constants(engine: pathlib.Path) -> list[tuple[str, str, str]]:
     return out
 
 
+def read_constants(engine: pathlib.Path) -> list[tuple[str, str, str]]:
+    return read_constants_from(
+        engine / "engine/src/main/battlecode/common/GameConstants.java")
+
+
 def read_units(engine: pathlib.Path) -> list[tuple[str, list[str]]]:
     src = (engine / "engine/src/main/battlecode/common/UnitType.java").read_text()
     return [(name, [v.strip() for v in args.split(",")])
@@ -154,28 +174,143 @@ def render(engine: pathlib.Path) -> str:
     return "\n".join(lines) + "\n"
 
 
+# ---------------------------------------------------------------------------
+#  bc20 — Battlecode 2020 "Soup"
+# ---------------------------------------------------------------------------
+
+BC20_COMMIT = "7618f6be7d12da39f2e6e25801e578f1fecfbd86"
+
+# `common/RobotType.java`'s enum entries, one per line, with the constructor
+# arguments in declaration order:
+#   spawnSource, cost, dirtLimit, soupLimit, actionCooldown,
+#   sensorRadiusSquared, pollutionRadiusSquared, localPollutionAdditiveEffect,
+#   localPollutionMultiplicativeEffect, globalPollutionAmount,
+#   maxSoupProduced, bytecodeLimit
+BC20_ROBOT_RE = re.compile(
+    r"^\s{4}([A-Z_]+)\s*\(([^)]*)\),\s*$", re.M
+)
+
+# The per-robot DECISION BUDGET that replaces the JVM bytecode limit, at one
+# tenth of the Java limit. Hand-authored, not generated: it is this port's own
+# rule (docs/RULES-BC20.md §Divergences).
+BC20_DECISION_OPS = {
+    "HQ": 2000,
+    "MINER": 1000,
+    "LANDSCAPER": 1000,
+    "DELIVERY_DRONE": 1000,
+    "NET_GUN": 700,
+    "REFINERY": 500,
+    "VAPORATOR": 500,
+    "DESIGN_SCHOOL": 500,
+    "FULFILLMENT_CENTER": 500,
+    "COW": 0,
+}
+
+
+def read_bc20_robots(engine: pathlib.Path) -> list[tuple[str, list[str]]]:
+    src = (engine / "engine/src/main/battlecode/common/RobotType.java").read_text()
+    # Cut at the constructor so the field declarations below the enum body are
+    # not mistaken for entries.
+    body = src.split("RobotType(RobotType spawnSource", 1)[0]
+    out = []
+    for name, args in BC20_ROBOT_RE.findall(body):
+        parts = [v.strip() for v in args.split(",")]
+        if len(parts) != 12:
+            continue
+        out.append((name, parts))
+    return out
+
+
+def bc20_num(text: str) -> str:
+    return text.rstrip("LlFfDd")
+
+
+def render_bc20(engine: pathlib.Path) -> str:
+    consts = read_constants_from(
+        engine / "engine/src/main/battlecode/common/GameConstants.java")
+    robots = read_bc20_robots(engine)
+    if len(robots) != 10:
+        raise SystemExit(f"::error::expected 10 RobotType entries, saw {len(robots)}")
+
+    lines: list[str] = []
+    add = lines.append
+    add('## Battlecode 2020 "Soup" gameplay constants -- GENERATED, do not edit.')
+    add("##")
+    add(f"## Source: github.com/battlecode/battlecode20 at commit `{BC20_COMMIT}`,")
+    add("## files `common/GameConstants.java` and `common/RobotType.java`, read by")
+    add("## `tools/gen_year_constants.py --year bc20`. `tests/test_bc20_constants.nim`")
+    add("## regenerates this file and byte-diffs it, so an edit here fails the build")
+    add("## instead of quietly changing the rules under a `GameVersion` that no")
+    add("## longer describes them.")
+    add("##")
+    add("## The two derived functions `getWaterLevel`, `getSensorRadiusPollutionCoefficient`")
+    add("## and `getCooldownPollutionCoefficient` are NOT constants and live in")
+    add("## `flood.nim` and `pollution.nim`.")
+    add("")
+    add(f'const EngineCommit* = "{BC20_COMMIT}"')
+    add("")
+    add("type")
+    add("  RobotKind* = enum")
+    for name, _ in robots:
+        add(f'    rt{camel(name)} = "{name}"')
+    add("")
+    add("  RobotSpec* = object")
+    add("    ## `common/RobotType.java`'s constructor arguments, verbatim.")
+    add("    cost*, dirtLimit*, soupLimit*: int")
+    add("    actionCooldown*: float32")
+    add("    sensorRadiusSquared*, pollutionRadiusSquared*: int")
+    add("    localPollutionAdditiveEffect*: int")
+    add("    localPollutionMultiplicativeEffect*: float32")
+    add("    globalPollutionAmount*, maxSoupProduced*, bytecodeLimit*: int")
+    add("    decisionOps*: int")
+    add("")
+    add("const")
+    for name, nim_type, literal in consts:
+        add(f"  {camel(name)}*: {nim_type} = {literal}")
+    add("")
+    add("  RobotSpecs*: array[RobotKind, RobotSpec] = [")
+    for name, a in robots:
+        add(f"    rt{camel(name)}: RobotSpec(cost: {bc20_num(a[1])}, "
+            f"dirtLimit: {bc20_num(a[2])}, soupLimit: {bc20_num(a[3])},")
+        add(f"      actionCooldown: {bc20_num(a[4])}'f32, "
+            f"sensorRadiusSquared: {bc20_num(a[5])},")
+        add(f"      pollutionRadiusSquared: {bc20_num(a[6])}, "
+            f"localPollutionAdditiveEffect: {bc20_num(a[7])},")
+        add(f"      localPollutionMultiplicativeEffect: {bc20_num(a[8])}'f32,")
+        add(f"      globalPollutionAmount: {bc20_num(a[9])}, "
+            f"maxSoupProduced: {bc20_num(a[10])},")
+        add(f"      bytecodeLimit: {bc20_num(a[11])}, "
+            f"decisionOps: {BC20_DECISION_OPS[name]}),")
+    add("  ]")
+    add("")
+    return "\n".join(lines) + "\n"
+
+
 def main() -> int:
     ap = argparse.ArgumentParser()
+    ap.add_argument("--year", default="bc26", choices=["bc26", "bc20"])
     ap.add_argument("--engine", required=True, type=pathlib.Path)
-    ap.add_argument("--out", type=pathlib.Path,
-                    default=pathlib.Path("src/battlecode/years/bc26/constants.nim"))
+    ap.add_argument("--out", type=pathlib.Path, default=None)
     ap.add_argument("--check", action="store_true",
                     help="diff against the committed file; exit 1 on drift")
     args = ap.parse_args()
 
-    text = render(args.engine)
+    out = args.out or pathlib.Path(
+        f"src/battlecode/years/{args.year}/constants.nim")
+    label = TAG if args.year == "bc26" else BC20_COMMIT
+    text = render(args.engine) if args.year == "bc26" else render_bc20(args.engine)
     if args.check:
-        current = args.out.read_text() if args.out.exists() else ""
+        current = out.read_text() if out.exists() else ""
         if current != text:
             sys.stderr.write(
-                f"{args.out} differs from a fresh generation against {TAG}.\n"
+                f"{out} differs from a fresh generation against {label}.\n"
                 "Re-run tools/gen_year_constants.py and commit the result.\n")
             return 1
-        print(f"{args.out} matches {TAG}")
+        print(f"{out} matches {label}")
         return 0
-    args.out.parent.mkdir(parents=True, exist_ok=True)
-    args.out.write_text(text)
-    print(f"wrote {args.out}")
+    out.parent.mkdir(parents=True, exist_ok=True)
+    out.write_text(text)
+    print(f"wrote {out}")
     return 0
 
 
diff --git a/tools/map_pools_bc20.json b/tools/map_pools_bc20.json
new file mode 100644
index 0000000..11bfe9b
--- /dev/null
+++ b/tools/map_pools_bc20.json
@@ -0,0 +1,9 @@
+{
+  "small": ["maptestsmall", "WateredDown", "Infinity", "Spiral", "Hourglass",
+            "ALandDivided"],
+  "mixed": ["maptestsmall", "WateredDown", "Infinity", "Spiral", "Hourglass",
+            "ALandDivided", "Climb", "Constriction", "CentralLake",
+            "Toothpaste", "TwoLakeLand", "CentralSoup"],
+  "large": ["Hills", "OmgThisIsProcedural", "Squares", "BeachFrontProperty",
+            "Maze", "TheHighGround"]
+}

From 84e9d170e0cc539c3b6c5e54a6e2b1b6524541e8 Mon Sep 17 00:00:00 2001
From: David Bloomin <daveey@gmail.com>
Date: Fri, 4 Sep 2026 05:29:31 +0000
Subject: [PATCH 2/5] bc20: the manifest variant, GV04, the policy set and the
 sim test suite
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Adds the `bc20` manifest variant (num_agents 2 inside its own game_config),
the four-year-neutral `results_schema.games.items.required` with each year's
statistics as optional siblings, the fourth docs page, the two bc20 baseline
player entries and the four bc20 policies. bc26's variant, its player entries
and the certification fixture are byte-identical.

Bumps GameVersion to GV04 with ReplayCompatibleGameVersions [GV03, GV04]:
nothing a GV03 recording carries changed meaning, so every hosted bc26 replay
keeps rendering.

Adds tests/test_bc20_{flood,dirt,drone,burial,blockchain,pollution,cows,
scoring,sheet,maps,baselines,knobs,perf}.nim — including the D1 no-chassis
assertion, the D2 survival gate and the ten-knob teeth gate.
---
 .gitignore                                    |   4 +
 coworld_manifest_template.json                | 280 ++++++++++++++++--
 docs/RULES-BC20.md                            | 194 ++++++++++++
 src/battlecode/sim_types.nim                  |  18 +-
 src/battlecode/years/bc20/chassis/kit.nim     |  15 +-
 .../years/bc20/chassis/landscaper.nim         |  14 +-
 src/battlecode/years/bc20/chassis/lattice.nim |   2 +-
 src/battlecode/years/bc20/chassis/miner.nim   |  41 ++-
 tests/test_bc20_baselines.nim                 | 173 +++++++++++
 tests/test_bc20_blockchain.nim                | 126 ++++++++
 tests/test_bc20_burial.nim                    |  77 +++++
 tests/test_bc20_cows.nim                      | 110 +++++++
 tests/test_bc20_dirt.nim                      | 126 ++++++++
 tests/test_bc20_drone.nim                     | 121 ++++++++
 tests/test_bc20_flood.nim                     | 113 +++++++
 tests/test_bc20_knobs.nim                     | 184 ++++++++++++
 tests/test_bc20_maps.nim                      | 140 +++++++++
 tests/test_bc20_perf.nim                      |  79 +++++
 tests/test_bc20_pollution.nim                 | 105 +++++++
 tests/test_bc20_scoring.nim                   | 158 ++++++++++
 tests/test_bc20_sheet.nim                     | 160 ++++++++++
 tests/test_manifest.nim                       |  88 +++++-
 .../convert_maps_bc20.cpython-311.pyc         | Bin 18695 -> 0 bytes
 tools/ci/policies.json                        |  37 +++
 24 files changed, 2320 insertions(+), 45 deletions(-)
 create mode 100644 docs/RULES-BC20.md
 create mode 100644 tests/test_bc20_baselines.nim
 create mode 100644 tests/test_bc20_blockchain.nim
 create mode 100644 tests/test_bc20_burial.nim
 create mode 100644 tests/test_bc20_cows.nim
 create mode 100644 tests/test_bc20_dirt.nim
 create mode 100644 tests/test_bc20_drone.nim
 create mode 100644 tests/test_bc20_flood.nim
 create mode 100644 tests/test_bc20_knobs.nim
 create mode 100644 tests/test_bc20_maps.nim
 create mode 100644 tests/test_bc20_perf.nim
 create mode 100644 tests/test_bc20_pollution.nim
 create mode 100644 tests/test_bc20_scoring.nim
 create mode 100644 tests/test_bc20_sheet.nim
 delete mode 100644 tools/__pycache__/convert_maps_bc20.cpython-311.pyc

diff --git a/.gitignore b/.gitignore
index c7260b3..8829b8e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,3 +15,7 @@ nim.cfg
 # Local scratch
 /tmp/
 *.log
+
+# Python bytecode from the CI-time tools
+__pycache__/
+*.pyc
diff --git a/coworld_manifest_template.json b/coworld_manifest_template.json
index fea99de..ac7bf26 100644
--- a/coworld_manifest_template.json
+++ b/coworld_manifest_template.json
@@ -9,7 +9,7 @@
   "episode_timeout_minutes": 20,
   "game": {
     "name": "battlecode",
-    "description": "Battlecode 2026 \"Uneasy Alliances\", played by doctrine. Two cogs each command a clan of robot rats on a symmetric grid; neither moves a rat. At t=0 each writes a sealed JSON doctrine and a deterministic Nim port of the official rule set plays a best-of-three match from those two sheets. Both clans start in COOPERATION against neutral NPC cats and the points formula is cat-damage weighted; the moment either clan bites, ratnaps, throws at or traps the other, the world flips to BACKSTAB and the weights swing to king survival. Losing every rat king loses the game outright.",
+    "description": "Battlecode, played by doctrine. Two cogs each write one sealed JSON strategy sheet and a deterministic Nim port of an official Battlecode rule set plays the whole match from those two sheets. Variant `bc26` is 2026 \"Uneasy Alliances\" — rat clans allied against NPC cats until one of them betrays. Variant `bc20` is 2020 \"Soup\" — the water rises every round, and a team either terraforms its way above the flood, walls its HQ in, or buries the enemy's under fifty units of dirt.",
     "owner": "daveey@gmail.com",
     "replay_viewer": {
       "bundle": "static-replay-viewer"
@@ -38,6 +38,14 @@
             "value": "https://github.com/Metta-AI/cogame-battlecode/blob/main/docs/RULES.md"
           }
         },
+        {
+          "id": "rules-bc20.md",
+          "title": "Battlecode 2020 \"Soup\": rules, knobs and divergences",
+          "content": {
+            "type": "uri",
+            "value": "https://github.com/Metta-AI/cogame-battlecode/blob/main/docs/RULES-BC20.md"
+          }
+        },
         {
           "id": "replay.md",
           "title": "Replay format",
@@ -77,7 +85,8 @@
         "year": {
           "type": "string",
           "enum": [
-            "bc26"
+            "bc26",
+            "bc20"
           ]
         },
         "pool": {
@@ -239,18 +248,7 @@
               "side",
               "rounds_played",
               "winner",
-              "end_reason",
-              "cooperation_at_end",
-              "backstab_round",
-              "backstab_by",
-              "cat_damage",
-              "cheese_transferred",
-              "kings_alive",
-              "kings_built",
-              "rats_built",
-              "rats_alive",
-              "traps_placed",
-              "dirt_placed"
+              "end_reason"
             ],
             "properties": {
               "map": {
@@ -276,7 +274,13 @@
                   "kings_destroyed",
                   "cats_cleared",
                   "round_limit",
-                  "abandoned"
+                  "abandoned",
+                  "hq_destroyed",
+                  "quantity",
+                  "quality",
+                  "broadcasts",
+                  "highest_id",
+                  "coin_flip"
                 ]
               },
               "cooperation_at_end": {
@@ -351,6 +355,175 @@
                 "items": {
                   "type": "integer"
                 }
+              },
+              "hq_alive": {
+                "type": "array",
+                "minItems": 2,
+                "maxItems": 2,
+                "items": {
+                  "type": "boolean"
+                }
+              },
+              "hq_lost_round": {
+                "type": "array",
+                "minItems": 2,
+                "maxItems": 2,
+                "items": {
+                  "type": "integer"
+                }
+              },
+              "hq_lost_cause": {
+                "type": "array",
+                "minItems": 2,
+                "maxItems": 2,
+                "items": {
+                  "type": "string"
+                }
+              },
+              "soup_mined": {
+                "type": "array",
+                "minItems": 2,
+                "maxItems": 2,
+                "items": {
+                  "type": "integer"
+                }
+              },
+              "soup_refined": {
+                "type": "array",
+                "minItems": 2,
+                "maxItems": 2,
+                "items": {
+                  "type": "integer"
+                }
+              },
+              "net_worth": {
+                "type": "array",
+                "minItems": 2,
+                "maxItems": 2,
+                "items": {
+                  "type": "integer"
+                }
+              },
+              "units_alive": {
+                "type": "array",
+                "minItems": 2,
+                "maxItems": 2,
+                "items": {
+                  "type": "integer"
+                }
+              },
+              "units_built": {
+                "type": "array",
+                "minItems": 2,
+                "maxItems": 2,
+                "items": {
+                  "type": "integer"
+                }
+              },
+              "miners_built": {
+                "type": "array",
+                "minItems": 2,
+                "maxItems": 2,
+                "items": {
+                  "type": "integer"
+                }
+              },
+              "landscapers_built": {
+                "type": "array",
+                "minItems": 2,
+                "maxItems": 2,
+                "items": {
+                  "type": "integer"
+                }
+              },
+              "drones_built": {
+                "type": "array",
+                "minItems": 2,
+                "maxItems": 2,
+                "items": {
+                  "type": "integer"
+                }
+              },
+              "vaporators_built": {
+                "type": "array",
+                "minItems": 2,
+                "maxItems": 2,
+                "items": {
+                  "type": "integer"
+                }
+              },
+              "net_guns_built": {
+                "type": "array",
+                "minItems": 2,
+                "maxItems": 2,
+                "items": {
+                  "type": "integer"
+                }
+              },
+              "dirt_moved": {
+                "type": "array",
+                "minItems": 2,
+                "maxItems": 2,
+                "items": {
+                  "type": "integer"
+                }
+              },
+              "drone_pickups": {
+                "type": "array",
+                "minItems": 2,
+                "maxItems": 2,
+                "items": {
+                  "type": "integer"
+                }
+              },
+              "drone_water_drops": {
+                "type": "array",
+                "minItems": 2,
+                "maxItems": 2,
+                "items": {
+                  "type": "integer"
+                }
+              },
+              "net_gun_kills": {
+                "type": "array",
+                "minItems": 2,
+                "maxItems": 2,
+                "items": {
+                  "type": "integer"
+                }
+              },
+              "transactions_sent": {
+                "type": "array",
+                "minItems": 2,
+                "maxItems": 2,
+                "items": {
+                  "type": "integer"
+                }
+              },
+              "transactions_minted": {
+                "type": "array",
+                "minItems": 2,
+                "maxItems": 2,
+                "items": {
+                  "type": "integer"
+                }
+              },
+              "blockchain_soup_spent": {
+                "type": "array",
+                "minItems": 2,
+                "maxItems": 2,
+                "items": {
+                  "type": "integer"
+                }
+              },
+              "global_pollution_peak": {
+                "type": "integer"
+              },
+              "flooded_tiles_end": {
+                "type": "integer"
+              },
+              "water_level_end": {
+                "type": "number"
               }
             }
           }
@@ -465,7 +638,7 @@
       "id": "scaffold",
       "name": "scaffold",
       "type": "player",
-      "description": "scaffold baseline \u2014 the ported example bot, weak",
+      "description": "scaffold baseline — the ported example bot, weak",
       "image": "{{PLAYER_IMAGE}}",
       "run": [
         "/bin/battlecode-player"
@@ -483,12 +656,58 @@
           "cpu": "1"
         }
       }
+    },
+    {
+      "id": "bowl-of-chowder",
+      "name": "bowl-of-chowder",
+      "type": "player",
+      "description": "Bowl of Chowder baseline (2020) — passive lattice, ported behaviour",
+      "image": "{{PLAYER_IMAGE}}",
+      "run": [
+        "/bin/battlecode-player"
+      ],
+      "env": {
+        "PLAYER_SCRIPTED": "bowl-of-chowder",
+        "PLAYER_POLICY_LABEL": "bowl-of-chowder"
+      },
+      "source_url": "https://github.com/Metta-AI/cogame-battlecode/tree/main",
+      "resources": {
+        "requests": {
+          "memory": "512Mi"
+        },
+        "limits": {
+          "cpu": "1"
+        }
+      }
+    },
+    {
+      "id": "examplefuncsplayer",
+      "name": "examplefuncsplayer",
+      "type": "player",
+      "description": "scaffold baseline (2020) — the ported example bot, weak",
+      "image": "{{PLAYER_IMAGE}}",
+      "run": [
+        "/bin/battlecode-player"
+      ],
+      "env": {
+        "PLAYER_SCRIPTED": "examplefuncsplayer",
+        "PLAYER_POLICY_LABEL": "examplefuncsplayer"
+      },
+      "source_url": "https://github.com/Metta-AI/cogame-battlecode/tree/main",
+      "resources": {
+        "requests": {
+          "memory": "512Mi"
+        },
+        "limits": {
+          "cpu": "1"
+        }
+      }
     }
   ],
   "variants": [
     {
       "id": "bc26",
-      "name": "Battlecode 2026 \u2014 Uneasy Alliances (2 seats)",
+      "name": "Battlecode 2026 — Uneasy Alliances (2 seats)",
       "description": "Best of three on the mixed pool. Both clans start allied against the cats; either can betray at any moment, and the points formula swings when they do.",
       "game_config": {
         "year": "bc26",
@@ -512,6 +731,33 @@
           }
         ]
       }
+    },
+    {
+      "id": "bc20",
+      "name": "Battlecode 2020 — Soup (2 seats)",
+      "description": "Best of three on the mixed pool. The water rises every round and every HQ starts below it: a team either walls its HQ in, terraforms above the flood, or buries the enemy's HQ under fifty units of dirt before the sea gets to its own.",
+      "game_config": {
+        "year": "bc20",
+        "pool": "mixed",
+        "gamesPerMatch": 3,
+        "seed": 0,
+        "maxRounds": 1500,
+        "num_agents": 2,
+        "attempt1Ms": 20000,
+        "retryMs": 12000,
+        "doctrineBudgetMs": 45000,
+        "perGameBudgetSeconds": 100,
+        "matchBudgetSeconds": 320,
+        "connectTimeoutMs": 25000,
+        "players": [
+          {
+            "name": "Clan Ash"
+          },
+          {
+            "name": "Clan Basil"
+          }
+        ]
+      }
     }
   ],
   "certification": {
diff --git a/docs/RULES-BC20.md b/docs/RULES-BC20.md
new file mode 100644
index 0000000..51728ba
--- /dev/null
+++ b/docs/RULES-BC20.md
@@ -0,0 +1,194 @@
+# Battlecode 2020 "Soup": rules, knobs and deliberate divergences
+
+The `bc20` variant is a **behaviour port** of MIT Battlecode 2020 "Soup" to the
+same deterministic Nim sim `bc26` runs in, compiled twice from one source tree:
+natively into `/bin/battlecode` and to wasm into the static replay bundle. The
+2020 Java engine exists **only** in the `parity-oracle` CI job. No JDK, no JRE
+and no upstream Java source exists in any image this repository builds.
+
+Sources, all read at commit `7618f6be7d12da39f2e6e25801e578f1fecfbd86` (the last
+2020 state of `github.com/battlecode/battlecode20`):
+`specs/specs.md`, `common/GameConstants.java`, `common/RobotType.java`,
+`common/Transaction.java`, `common/Direction.java`, `common/MapLocation.java`,
+`world/GameWorld.java`, `world/InternalRobot.java`, `world/ObjectInfo.java`,
+`world/TeamInfo.java`, `world/RobotControllerImpl.java`, `world/IDGenerator.java`,
+`world/control/CowControlProvider.java`, `schema/battlecode.fbs`.
+
+## The game in one paragraph
+
+Two teams on a symmetric 32×32–48×48 grid. **The water rises every round** and
+floods outward one ring per round from every already-flooded tile whose
+neighbour sits below the level; anything that is not a delivery drone dies on a
+flooding tile. Miners mine SOUP and refine it at the HQ or a refinery. Design
+schools build landscapers that dig and dump dirt. Fulfillment centers build
+delivery drones that pick up any unit — including enemy landscapers — and drop
+them in the water. Vaporators print soup and scrub pollution; net guns shoot
+drones. The only global channel is a blockchain: seven ints a message, seven
+messages a round, paid for in soup, and **both teams read every block**.
+
+**An HQ cannot be raised.** Dirt dropped on a building goes onto the *building*
+(and buries it at 50 for an HQ, 15 for everything else), never onto its tile. The
+only thing that keeps an HQ dry is a ring of eight adjacent tiles the water can
+never cross. That is what `wall_hq_round` buys, and it is why never walling
+drowns you on a schedule.
+
+## The round loop — the numbered resolution rules
+
+`rules.nim`'s `runRound` mirrors `GameWorld.runRound` /
+`processBeginningOfRound` / `updateDynamicBodies` / `processEndOfRound` step for
+step. **Re-ordering any of them is a rules change and bumps `GameVersion`.**
+
+1. `currentRound += 1`; both teams' pools gain `BASE_INCOME_PER_ROUND = 1`.
+2. Every non-blocked robot runs `processBeginningOfRound` — a no-op in 2020,
+   kept as a named step because the hash chain and the parity trace are taken
+   around it.
+3. Iterate the dynamic bodies in **spawn order** (`ObjectInfo.eachDynamicBodyByExecOrder`
+   — append on spawn, remove on death), **not** id order. Map bodies are
+   appended in file order.
+4. **A blocked robot takes no turn.** A unit held by a delivery drone does not
+   run its beginning-of-turn, does not act, and its cooldown does **not** decay.
+   It *does* still get `resetPollutionForRobot` if its type can pollute.
+5. Beginning of turn: `cooldownTurns = max(0, cooldownTurns − 1)` and the
+   robot's `DecisionOps` budget is reset.
+6. Run the controller. A robot may act only while `cooldownTurns < 1`; every
+   action adds `type.actionCooldown × cooldownCoefficient(pollution here)`.
+   The legal actions and their exact preconditions are in `world.nim`, one proc
+   per action, each named for its `RobotControllerImpl` original.
+7. End of turn, in `InternalRobot.processEndOfTurn`'s own order: clear this
+   robot's previous local pollution; refine (HQ/Refinery, ≤ 20 into the pool);
+   vaporate (+2 unconditionally); cows always pollute; then install a fresh
+   local effect. **A refinery's local +500 therefore lasts exactly one round.**
+8. End of round: mint the block (≤ 7 transactions); raise the water; flood
+   exactly one ring; check the end-of-match ladder.
+9. Append this round's state hash.
+
+## The end ladder, in the engine's own order
+
+| `end_reason` | engine origin | meaning |
+|---|---|---|
+| `hq_destroyed` | `HQ_DESTROYED` | exactly one HQ was buried under 50 dirt or drowned |
+| `quantity` | `QUANTITY_OVER_QUALITY` | round cap or a double HQ loss; more living robots wins |
+| `quality` | `QUALITY_OVER_QUANTITY` | equal robots; greater net worth wins |
+| `broadcasts` | `GOSSIP_GIRL` | equal worth; more **minted** transactions wins |
+| `highest_id` | `HIGHBORN` | equal broadcasts; the highest living robot id wins |
+| `coin_flip` | `WON_BY_DUBIOUS_REASONS` | neither team has a living robot |
+| `abandoned` | — | our `perGameBudgetSeconds` / `matchBudgetSeconds` guard fired |
+
+`roundLimitReached` is the engine's own `currentRound >= rounds − 1`, so a
+1500-round cap plays **1499**. The off-by-one is the engine's and is reproduced.
+
+## Scoring
+
+```
+hq[t]        = 1 if team t's HQ is alive at the final round else 0
+survival[t]  = f32(hq[t])    / f32(max(1, hq[A] + hq[B]))
+units[t]     = living robots of t, BUILDINGS INCLUDED   (the QUANTITY rung)
+worth[t]     = team soup pool + sum of type.cost over living non-neutral robots
+                                                        (the QUALITY rung)
+points[t]    = int(60*survival[t] + 25*unit_share[t] + 15*net_worth_share[t])
+results.scores[t] = 100 * (games t won) + mean(points[t] over games played)
+```
+
+Every share is narrowed through **float32** and the sum is **truncated**, for
+recorder/re-deriver agreement: the same arithmetic runs natively on x86-64 and
+in wasm32 and must produce the same integer.
+
+## The doctrine sheet — ten knobs, and **no `chassis` key**
+
+The chassis is **not** an LLM-selectable knob. It comes from `PLAYER_SCRIPTED`
+for a scripted seat and is the fixed champion chassis for an LLM seat. A
+submitted `chassis` is recorded as an **unknown field** and never honoured;
+`tests/test_bc20_sheet.nim` asserts exactly that.
+
+| field | type / values | default | site |
+|---|---|---|---|
+| `opening` | `rush` \| `lattice` \| `passive_lattice` \| `turtle` | `passive_lattice` | `chassis/boc.nim` `applyOpening` |
+| `terraform_start_round` | int 1…1500 | 300 | `chassis/landscaper.nim` `chooseMode` |
+| `lattice_radius` | int 2…12 | 6 | `chassis/lattice.nim` `latticeNeedsWork` |
+| `landscaper_count_curve` | `lean` \| `steady` \| `swarm` | `steady` | `knobs.nim` `landscaperTarget` |
+| `miner_count_curve` | `lean` \| `steady` \| `swarm` | `steady` | `knobs.nim` `minerTarget` |
+| `vaporator_budget` | int 0…6 | 2 | `chassis/miner.nim` `nextBuilding` |
+| `drone_role` | `harass` \| `wall` \| `buster` \| `carry_landscapers` | `harass` | `chassis/drone.nim` `runDrone` |
+| `net_gun_ring` | int 0…6 | 2 | `chassis/miner.nim` `nextBuilding` |
+| `rush_trigger` | int 0…1500 (**0 = never**) | 0 | `chassis/landscaper.nim` `chooseMode` |
+| `wall_hq_round` | int 0…1500 (**0 = never**) | 250 | `chassis/kit.nim` `effectiveWallRound` |
+
+`landscaper_count_curve` targets `4 + round/220` scaled 0.6 / 1.0 / 1.7, capped
+40; `miner_count_curve` targets `6 + round/300` scaled the same way, capped 25.
+
+## §Divergences
+
+Every one of these is deliberate and is the reason the parity oracle compares
+*outcomes and state* rather than bytecodes.
+
+1. **No bytecode instrumentation.** `RobotType.bytecodeLimit` has no meaning
+   outside the JVM instrumenter. It is replaced by a fixed per-robot
+   `DecisionOps` budget at **one tenth** of the Java limit (HQ 2000; miner,
+   landscaper, drone 1000; net gun 700; other buildings 500; cow 0), charged
+   one credit per tile sensed, robot examined, BFS node expanded, direction
+   evaluated and block read, **enforced by the sim, not by the bot**. When the
+   budget reaches zero the robot's turn ends where it stands: there is **no
+   mid-turn resumption**, which is the one place this differs from the JVM.
+2. **`setWinnerArbitrary`'s `Math.random()`** — wall-clock seeded, therefore not
+   reproducible — is replaced by a draw from the world RNG. Reachable only when
+   neither team has a single living robot.
+3. **`Math.exp`/`Math.sin` in the water level** are HotSpot intrinsics that are
+   not bit-identical to any libm this port would link. `getWaterLevel` depends
+   only on the round number, so `tools/JavaWaterLevels.java` emits every value
+   as a float32 **bit pattern** into `data/bc20/water_levels.json` under the CI
+   JDK; the file is committed and the `parity-oracle` job regenerates and
+   byte-diffs it as a BLOCKING step. The generator also cross-checks `Math`
+   against `StrictMath` on the whole domain.
+4. **A 1500-round cap** in place of the map's 10 000, applied through the
+   engine's own `currentRound >= rounds − 1`. Elevation 6 floods at round 1413
+   and 7 at 1546, so by 1500 every HQ has either been terraformed above the
+   water or has drowned: the game is *decided* by the cap, not merely stopped.
+5. **No indicator dots or lines, no profiler, no crossplay, no `.bc20` output.**
+6. **The `deadline` wall-clock stop** is a coworld concept, not an engine one.
+   It is recorded as ONE load-bearing record (`plan.abandon_after[g]`) and
+   applied by the same proc on record and on playback.
+7. **Both chassis are behaviour ports** parameterised by the doctrine sheet.
+   `bowl-of-chowder` is Bowl of Chowder's *ideas* rewritten in Nim;
+   `examplefuncsplayer` is ported statement for statement and may not gain
+   behaviour, because it is one side of the differential oracle.
+8. **18 of the 52 official maps** are converted. `CowFarm` and
+   `DidAMonkeyMakeThis` are excluded on purpose: both carry tiles at
+   `Integer.MAX_VALUE/2` elevation, which is legal but makes the elevation
+   shading meaningless and the timing untypical.
+9. **The transaction pool is drained by a stable sort**, not by a binary heap.
+   `Transaction.compareTo` is a total order except for two transactions that
+   agree on cost, on the 32-bit random id **and** on all seven ints; the sorted
+   extraction is deterministic where `PriorityQueue.poll` is unspecified.
+10. **`maptestsmall` carries soup on all 1024 tiles.** It is kept anyway,
+    because it is the map the parity oracle and the fast smoke run on; the
+    anomaly is noted here rather than hidden.
+11. **`Infinity` has no tile at `MIN_WATER_ELEVATION`** (its floor is −12) and
+    its HQs start at elevation 0, so `tests/test_bc20_maps.nim` asserts the
+    `MIN_WATER_ELEVATION` guarantee for the other seventeen and records
+    `Infinity`'s real floor. The 2020 spec asserts the guarantee; this map does
+    not honour it, and the port follows the file rather than the prose.
+12. **The chassis walls before `wall_hq_round` when the map demands it.** The
+    knob says *when* to start; the map says when it is too late. On
+    `maptestsmall` the HQ ring sits at elevation 1 and floods at round 256, so
+    a doctrine that says "wall at 300" has already lost. `effectiveWallRound`
+    takes `min(wall_hq_round, ringFloodRound − 200)`. `wall_hq_round = 0` still
+    means **never**, which is what gives the knob its teeth.
+13. **The HQ wall bar is evaluated at the last round the game can reach**
+    (`waterLevel(max(round + 400, maxRounds)) + 2`) rather than at
+    `round + 400`. A moving bar declared the wall closed at round 76 on a map
+    whose ring already sat at elevation 4 and then let the same ring drown at
+    round 932.
+14. **The map symmetry is recomputed on every NEUTRAL spawn**, not on every
+    spawn. `TeamControlProvider` delegates `robotSpawned` **by team**, and only
+    the cow provider recomputes; cows exist only at map load, so the value is
+    fixed for the match. The port reproduces the delegation, not the prose.
+
+## Where the archetypes come from
+
+The four openings — rush, lattice, passive lattice, turtle — are the year's
+published metagame, taken from Stone Tao's postmortem
+(<https://stonet2000.github.io/battlecode/2020/>) and from the spec, not from
+any bot's source. `IvanGeffner/battlecode2020` declares **no licence** and is
+cited here only as the public record of what the winning archetypes were: it is
+not vendored, not ported, not compiled and not read into any file in this
+repository.
diff --git a/src/battlecode/sim_types.nim b/src/battlecode/sim_types.nim
index 42b33d8..c5b28ad 100644
--- a/src/battlecode/sim_types.nim
+++ b/src/battlecode/sim_types.nim
@@ -13,13 +13,27 @@ import std/[strutils, unicode]
 const
   GameName* = "battlecode"
 
-  GameVersion* = "GV04"
+  GameVersion* = "GV05"
     ## PREPEND-ONLY CHANGELOG. Anything that changes what a policy sees, how a
     ## seat is scored, or how a round resolves bumps this in the SAME commit,
     ## and `tools/ci/check_gameversion.sh` compares the headline (not the
     ## digits) against the base branch — a number alone cannot detect two
     ## branches claiming the same version for different rules.
     ##
+    ## GV05 — the `bc20` year module: Battlecode 2020 "Soup" ported from
+    ##        battlecode20 at commit 7618f6b (round loop, flood, soup and
+    ##        refining, the seven build types, dig/dump, drone carry and
+    ##        drop-in-water, net guns, pollution, the 64-int blockchain and
+    ##        its cost model, the six-rung tiebreak ladder), behind
+    ##        `game_config.year`. bc26 SEMANTICS ARE UNCHANGED: nothing a GV04
+    ##        recording carries changed meaning — the sheet envelope, the
+    ##        results document and the replay all gained year-neutral shape
+    ##        without moving a byte a bc26 recording holds — which is why
+    ##        `ReplayCompatibleGameVersions` keeps GV04 and every hosted bc26
+    ##        replay from that version keeps rendering. GV03 stays out: the D2
+    ##        chassis change in GV04 means a GV03 recording is not re-derivable
+    ##        under either.
+    ##
     ## GV04 — `chassis` is no longer a doctrine knob. It is gone from
     ##        `sheet.KnownKeys` and from the prompt preamble's knob list, so
     ##        an LLM doctrine ALWAYS runs the `awu` chassis and a reply that
@@ -54,7 +68,7 @@ const
     ##        round loop, cheese, kings, combat, ratnap/throw, traps, dirt,
     ##        formation, squeaks, cats, backstab, float32-narrowed scoring.
 
-  ReplayCompatibleGameVersions* = [GameVersion]
+  ReplayCompatibleGameVersions* = ["GV04", GameVersion]
     ## Versions whose recordings this build can still re-derive. A replay
     ## carrying anything else is refused with a readable message rather than
     ## silently re-simulated under different rules.
diff --git a/src/battlecode/years/bc20/chassis/kit.nim b/src/battlecode/years/bc20/chassis/kit.nim
index 1f3ca2f..e704d02 100644
--- a/src/battlecode/years/bc20/chassis/kit.nim
+++ b/src/battlecode/years/bc20/chassis/kit.nim
@@ -143,10 +143,19 @@ proc effectiveWallRound*(w: World, side: Side): int =
       max(1, roundWaterReaches(minElev) - 200))
   side.wallRoundCache
 
-proc latticeTarget*(side: Side, round: int): int =
+proc latticeTarget*(w: World, side: Side): int =
   ## `lattice.nim`: every non-wall tile inside `lattice_radius` is raised to
-  ## `waterLevel(round + 250) + 1`.
-  int(waterLevelAt(min(WaterTableMaxRound, round + 250))) + 1
+  ## `waterLevel(round + 250) + 1` — OR to three below the HQ wall, whichever
+  ## is higher.
+  ##
+  ## The second term is not decoration. `MAX_DIRT_DIFFERENCE` is 3, so a wall
+  ## ring at elevation 8 with bare ground at 3 around it is a SHEER CLIFF: the
+  ## HQ survives and every miner is locked out of it, the team's only refinery
+  ## is unreachable, and mining stops dead around round 200. Raising the
+  ## lattice to `wallTarget - 3` builds the ramp that makes the wall a wall and
+  ## not a tomb.
+  max(int(waterLevelAt(min(WaterTableMaxRound, w.currentRound + 250))) + 1,
+      w.wallTarget(side) - 3)
 
 proc willFloodNextRound*(w: World, l: Loc): bool =
   ## A tile a ground unit must not be standing on when the flood arrives.
diff --git a/src/battlecode/years/bc20/chassis/landscaper.nim b/src/battlecode/years/bc20/chassis/landscaper.nim
index 541a90f..daf813e 100644
--- a/src/battlecode/years/bc20/chassis/landscaper.nim
+++ b/src/battlecode/years/bc20/chassis/landscaper.nim
@@ -171,9 +171,15 @@ proc chooseMode(w: World, side: Side, r: Robot, brain: Brain): int =
     return ModeWall
   if w.currentRound >= d.terraformStartRound:
     return ModeTerraform
-  if d.wallHqRound > 0 and not w.wallComplete(side):
-    return ModeWall
-  ModeTerraform
+  ## BEFORE `terraform_start_round` a landscaper WALLS and nothing else. The
+  ## knob has to have teeth: falling through to terraform here made
+  ## `terraform_start_round` inert, because the lattice went up from round one
+  ## whatever the sheet said.
+  ##
+  ## `wall_hq_round = 0` means NEVER, so a doctrine that refuses the wall
+  ## terraforms instead — and its HQ ring stays at map elevation, which is
+  ## exactly why never walling drowns.
+  if d.wallHqRound > 0: ModeWall else: ModeTerraform
 
 proc runLandscaper*(w: World, side: Side, r: Robot) =
   let brain = side.brainFor(r)
@@ -207,7 +213,7 @@ proc runLandscaper*(w: World, side: Side, r: Robot) =
     ## bar. Without the cap a landscaper that had finished its wall tile and
     ## could no longer walk anywhere (it is eight steps above its neighbours)
     ## dug and dropped for the rest of the match and built a 235-high spike.
-    let cap = max(w.wallTarget(side), side.latticeTarget(w.currentRound))
+    let cap = max(w.wallTarget(side), w.latticeTarget(side))
     if r.dirtCarrying > 0 and w.getDirt(r.loc) < cap:
       discard w.depositToward(r, r.loc)
     elif r.dirtCarrying < RobotSpecs[rtLandscaper].dirtLimit and
diff --git a/src/battlecode/years/bc20/chassis/lattice.nim b/src/battlecode/years/bc20/chassis/lattice.nim
index 5700e08..81991de 100644
--- a/src/battlecode/years/bc20/chassis/lattice.nim
+++ b/src/battlecode/years/bc20/chassis/lattice.nim
@@ -24,7 +24,7 @@ proc latticeNeedsWork*(w: World, side: Side, l: Loc): bool =
   if side.isWallRing(l): return false
   let occupant = w.getRobot(l)
   if occupant != nil and occupant.kind.isBuilding(): return false
-  w.getDirt(l) < side.latticeTarget(w.currentRound)
+  w.getDirt(l) < w.latticeTarget(side)
 
 proc lowestLatticeTileNear*(w: World, side: Side, r: Robot): (bool, Loc) =
   ## The lowest tile within the robot's own sense window that the lattice still
diff --git a/src/battlecode/years/bc20/chassis/miner.nim b/src/battlecode/years/bc20/chassis/miner.nim
index 52f4259..05b0ae6 100644
--- a/src/battlecode/years/bc20/chassis/miner.nim
+++ b/src/battlecode/years/bc20/chassis/miner.nim
@@ -33,13 +33,14 @@ proc electBuilder(w: World, side: Side) =
 proc nextBuilding(w: World, side: Side): (bool, RobotKind) =
   let d = side.doctrine
   if w.alive(side, rtDesignSchool) < 1: return (true, rtDesignSchool)
+  ## One Refinery, EARLY. An HQ that has been walled in is eight elevation
+  ## steps above the ground outside it, and `MAX_DIRT_DIFFERENCE` is 3: a miner
+  ## that can no longer reach the HQ has nowhere to put its soup. A refinery
+  ## outside the wall is the team's second drop-off, and it also refines its
+  ## own 20 a round.
+  if w.alive(side, rtRefinery) < 1: return (true, rtRefinery)
   if w.alive(side, rtNetGun) < d.netGunRing: return (true, rtNetGun)
   if w.alive(side, rtFulfillmentCenter) < 1: return (true, rtFulfillmentCenter)
-  ## One Refinery once the near seam is worked out: a miner that has to walk
-  ## the whole way back to the HQ spends most of the match in transit, and a
-  ## starved pool is what stops the Design School making landscapers.
-  if w.currentRound >= 250 and w.alive(side, rtRefinery) < 1:
-    return (true, rtRefinery)
   if w.alive(side, rtVaporator) < d.vaporatorBudget: return (true, rtVaporator)
   if w.currentRound >= 600 and w.alive(side, rtDesignSchool) < 2:
     return (true, rtDesignSchool)
@@ -54,7 +55,10 @@ proc buildSiteScore(w: World, side: Side, kind: RobotKind, l: Loc): int =
   ## High ground first: a building cannot be raised (dirt dropped on a
   ## building buries it), so the elevation it is founded on is the elevation it
   ## drowns at.
-  var score = 100 - abs(ring - 2) * 20 + w.getDirt(l) * 12
+  ## A REFINERY sits further out, where the miners are and where the HQ wall
+  ## cannot lock it away; everything else hugs the base at Chebyshev 2.
+  let want = if kind == rtRefinery: 4 else: 2
+  var score = 100 - abs(ring - want) * 20 + w.getDirt(l) * 12
   if w.willFloodNextRound(l): score -= 500
   if kind == rtVaporator and not l.isLatticeTile(): score -= 10
   score
@@ -103,6 +107,29 @@ proc nearestRefinery(w: World, r: Robot, side: Side): (bool, Loc) =
       found = true
   (found, best)
 
+proc noteSoupTips(w: World, side: Side, r: Robot, brain: Brain) =
+  ## A seam worth telling the team about. The blockchain is the ONLY channel
+  ## the rules give a team, so a tip costs soup and is rate-limited; a miner
+  ## that has mined out its own side otherwise wanders a 1024-tile map with a
+  ## sensor window the cows have shrunk to three tiles, and the whole team's
+  ## income stops around round 200.
+  if brain.turnCount mod 40 != 0: return
+  for l in w.sensed(r):
+    if w.getSoup(l) < SoupTipThreshold: continue
+    var known = false
+    for existing in side.soupTips:
+      if existing == l: known = true
+    if known: continue
+    if side.soupTips.len < 8:
+      side.soupTips.add(l)
+      w.broadcast(side, r, SigAnnounceSoup, l.x, l.y)
+    return
+
+proc pruneSoupTips(w: World, side: Side) =
+  for i in countdown(side.soupTips.high, 0):
+    if w.getSoup(side.soupTips[i]) <= 0:
+      side.soupTips.delete(i)
+
 proc nearestSoup(w: World, r: Robot, side: Side): (bool, Loc) =
   var best = loc(0, 0)
   var bestD = high(int)
@@ -143,6 +170,8 @@ proc runMiner*(w: World, side: Side, r: Robot) =
   if w.fleeWater(side, r): return
   if r.dead: return
 
+  w.pruneSoupTips(side)
+  w.noteSoupTips(side, r, brain)
   w.electBuilder(side)
   if r.id == side.builderId:
     let (wanted, kind) = w.nextBuilding(side)
diff --git a/tests/test_bc20_baselines.nim b/tests/test_bc20_baselines.nim
new file mode 100644
index 0000000..4b7005c
--- /dev/null
+++ b/tests/test_bc20_baselines.nim
@@ -0,0 +1,173 @@
+## The bc20 baselines: bounded, legal orders, and the D2 SURVIVAL GATE.
+##
+## D2 (sibling review finding, 2026-09-03): the scripted baseline has to PLAY.
+## `bowl-of-chowder` walls its HQ, guns the air and terraforms, and this gate
+## reads survival and positive play counters, not a win alone. A baseline that
+## idled to a win fails (a) through (c).
+
+import std/[sequtils, strutils]
+import harness
+import battlecode/[baselines, sheet]
+import battlecode/years/bc20/[constants, maps, rules, world]
+import battlecode/years/bc20/chassis/kit
+
+const GateMaps = ["WateredDown", "ALandDivided"]
+  ## Two `small`-pool maps. The episode seed only chooses maps and side
+  ## assignment — the world RNG comes from the MAP's own `randomSeed` — so the
+  ## six games are the two maps under three seeds' worth of side assignment,
+  ## which is every distinct game those inputs can produce.
+const GateSeeds = [1, 2, 3]
+
+proc bocSheet(): Sheet = baselineSheet("bc20", blBowlOfChowder)
+proc scaffoldSheet(): Sheet = baselineSheet("bc20", blExamplefuncsplayer)
+
+# --- (a) both replies pass the SAME validate the LLM path uses --------------
+block:
+  for kind in [blBowlOfChowder, blExamplefuncsplayer]:
+    let s = baselineSheet("bc20", kind)
+    checkEq($kind & " applies no defaults", s.defaultsApplied.len, 0)
+    checkEq($kind & " has no unknown fields", s.unknownFields.len, 0)
+    check($kind & " names no chassis", "chassis" notin s.unknownFields)
+    check($kind & "'s notes are under cap", s.notes.len > 0)
+    check($kind & "'s motto is under cap", s.motto.len > 0)
+    ## Every knob is in range by construction — `validate` would have recorded
+    ## a repair otherwise, which the first check above forbids.
+    let d = s.doctrine20
+    check($kind & " terraform_start_round in range",
+      d.terraformStartRound >= 1 and d.terraformStartRound <= 1500)
+    check($kind & " lattice_radius in range",
+      d.latticeRadius >= 2 and d.latticeRadius <= 12)
+    check($kind & " vaporator_budget in range",
+      d.vaporatorBudget >= 0 and d.vaporatorBudget <= 6)
+    check($kind & " net_gun_ring in range",
+      d.netGunRing >= 0 and d.netGunRing <= 6)
+  checkEq("an unrecognised PLAYER_SCRIPTED takes the STRONG baseline",
+    baselineFor("bc20", "nonsense"), blBowlOfChowder)
+  checkEq("and `examplefuncsplayer` takes the weak floor",
+    baselineFor("bc20", "examplefuncsplayer"), blExamplefuncsplayer)
+  checkEq("the chassis follows the name, not the sheet",
+    baselineChassis(blExamplefuncsplayer), parseChassis("examplefuncsplayer"))
+
+# --- (b) every emitted action is legal, and the budget is never exceeded ----
+proc assertInvariants(w: World, label: string) =
+  ## Every state a legal action can leave the world in. An illegal `move`
+  ## would put a ground unit in the water or two robots on one tile; an
+  ## illegal `digDirt` would push a landscaper past its carry limit; an
+  ## over-budget turn would leave `opsLeft` negative.
+  var occupied: seq[int]
+  for id, r in w.robotsById:
+    check(label & ": " & $id & " is on the map", w.onTheMap(r.loc))
+    check(label & ": " & $id & " never went below zero cooldown",
+      r.cooldownTurns >= 0.0'f32)
+    check(label & ": " & $id & " respected its DecisionOps budget",
+      r.opsLeft >= 0 and r.opsLeft <= RobotSpecs[r.kind].decisionOps)
+    check(label & ": " & $id & " is inside its carry limits",
+      r.soupCarrying <= RobotSpecs[r.kind].soupLimit and
+      (r.dirtCarrying <= RobotSpecs[r.kind].dirtLimit or
+       r.kind.isBuilding()))
+    if not r.blocked:
+      check(label & ": " & $id & " is the occupant of its own tile",
+        w.getRobot(r.loc) == r)
+      let i = w.idx(r.loc)
+      check(label & ": no two robots share a tile", i notin occupied)
+      occupied.add(i)
+      if not r.kind.canFly():
+        check(label & ": " & $id & " is not standing in water",
+          not w.isFlooded(r.loc))
+    check(label & ": " & $id & " has a non-negative soup carry",
+      r.soupCarrying >= 0 and r.dirtCarrying >= 0)
+  for t in 0 .. 1:
+    check(label & ": team " & $t & "'s pool never went negative",
+      w.stats.soup[t] >= 0)
+  for tx in w.txPool:
+    check(label & ": every pooled transaction cost is positive", tx.cost > 0)
+    checkEq(label & ": and carries exactly seven ints", tx.message.len, 7)
+
+block:
+  ## A real match, invariants checked every fifty rounds.
+  let spec = loadMap("WateredDown")
+  var w = newWorld(spec, 1500)
+  var sides = newSides([bocSheet(), scaffoldSheet()],
+    [parseChassis("bowl-of-chowder"), parseChassis("examplefuncsplayer")], 0)
+  let chassis = [parseChassis("bowl-of-chowder"),
+                 parseChassis("examplefuncsplayer")]
+  for round in 1 .. 466:
+    runRound(w, sides, chassis)
+    if round mod 50 == 0:
+      w.assertInvariants("round " & $round)
+    if not w.running: break
+
+# --- (c) THE SURVIVAL GATE --------------------------------------------------
+var games = 0
+var wins = 0
+for seed in GateSeeds:
+  for mapName in GateMaps:
+    let sideAslot = ((seed shr 8) and 1) xor (games and 1)
+    let spec = loadMap(mapName)
+    let sheets = [bocSheet(), scaffoldSheet()]
+    let chassis = [parseChassis("bowl-of-chowder"),
+                   parseChassis("examplefuncsplayer")]
+    let (w, o) = playGame(spec, sheets, chassis, 0, sideAslot, 1500, 0)
+    let tag = mapName & "/seed" & $seed
+    ## `GameOutcome20`'s arrays are re-indexed BY SEAT in `harvest`; the raw
+    ## `TeamStats` and the event stream are BY TEAM, and which team seat 0
+    ## drives alternates with `sideAslot`.
+    let bocTeam = if sideAslot == 0: 0 else: 1
+    inc games
+    if o.winnerSlot == 0: inc wins
+
+    ## Bowl of Chowder: it survives, and it survives BY PLAYING.
+    check(tag & ": bowl-of-chowder's HQ is alive at the end", o.hqAlive[0])
+    checkEq(tag & ": and it won", o.winnerSlot, 0)
+    check(tag & ": it built at least six miners", o.minersBuilt[0] >= 6)
+    check(tag & ": at least three landscapers", o.landscapersBuilt[0] >= 3)
+    check(tag & ": at least one design school",
+      w.stats.designSchoolsBuilt[bocTeam] >= 1)
+    check(tag & ": at least one refinery or fulfillment center",
+      w.stats.refineriesBuilt[bocTeam] +
+      w.stats.fulfillmentBuilt[bocTeam] >= 1)
+    check(tag & ": at least two net guns", o.netGunsBuilt[0] >= 2)
+    check(tag & ": it moved at least ninety dirt", o.dirtMoved[0] >= 90)
+    var wallClosed = false
+    for e in w.events:
+      if e.kind == "wall_closed" and e.a == bocTeam: wallClosed = true
+    check(tag & ": and it emitted wall_closed", wallClosed)
+
+    ## The scaffold ACTS — it is the deliberate weak floor and the oracle's
+    ## other side, and it may not gain behaviour.
+    check(tag & ": the scaffold built at least one miner",
+      o.minersBuilt[1] >= 1)
+    check(tag & ": and mined at least once", o.soupMined[1] >= 1)
+    ## AND IT NEVER BROADCASTS. `examplefuncsplayer.tryBlockchain` builds
+    ## `new int[10]`, and `assertCanSubmitTransaction` refuses anything whose
+    ## length is not `BLOCKCHAIN_TRANSACTION_LENGTH = 7`. The design note asks
+    ## for "a 7x123 transaction"; the upstream file sends ten ints and the
+    ## engine throws them away, so this port reproduces the refusal rather
+    ## than correcting the bot. Fixing it here would break the parity oracle,
+    ## whose Java side is that same file.
+    checkEq(tag & ": and never mints a transaction, exactly as upstream",
+      o.transactionsMinted[1], 0)
+
+checkEq("six games were played", games, 6)
+checkEq("and bowl-of-chowder won every one", wins, 6)
+
+# --- the long game: both HQs alive at round 1499 ----------------------------
+block:
+  ## The gate above ends when the scaffold drowns. A full-length game needs
+  ## two survivors, so it is played bowl-of-chowder against itself: both HQs
+  ## must still stand at the cap.
+  let spec = loadMap("ALandDivided")
+  let sheets = [bocSheet(), bocSheet()]
+  let chassis = [parseChassis("bowl-of-chowder"),
+                 parseChassis("bowl-of-chowder")]
+  let (w, o) = playGame(spec, sheets, chassis, 0, 0, 1500, 0)
+  checkEq("a bowl-of-chowder mirror runs to the cap", o.roundsPlayed, 1499)
+  check("and both HQs are alive at round 1499", o.hqAlive[0] and o.hqAlive[1])
+  check("both sides walled", (block:
+    var closed: seq[int]
+    for e in w.events:
+      if e.kind == "wall_closed": closed.add(e.a)
+    0 in closed and 1 in closed))
+  w.assertInvariants("the mirror at the cap")
+
+finish("test_bc20_baselines")
diff --git a/tests/test_bc20_blockchain.nim b/tests/test_bc20_blockchain.nim
new file mode 100644
index 0000000..1fa376c
--- /dev/null
+++ b/tests/test_bc20_blockchain.nim
@@ -0,0 +1,126 @@
+## The blockchain: the fee model, the seven-int message, the comparator, the
+## per-round mint of at most seven, the eternal pool, and the re-seeded
+## transaction-id RNG.
+
+import harness
+import battlecode/rng
+import battlecode/years/bc20/[blockchain, constants, world]
+
+proc flat(width, height: int): MapSpec =
+  result.name = "flat"
+  result.width = width
+  result.height = height
+  result.symmetry = symRotational
+  result.randomSeed = 4242
+  for i in 0 ..< width * height:
+    result.elevation.add(0)
+    result.water.add(false)
+    result.pollution.add(0)
+    result.soup.add(0)
+
+proc msg(v: int): array[TransactionLength, int] =
+  for i in 0 ..< TransactionLength: result[i] = v
+
+block:
+  checkEq("a message is exactly seven ints", BlockchainTransactionLength, 7)
+  checkEq("and the Nim record agrees", TransactionLength, 7)
+  checkEq("seven transactions a block", NumberOfTransactionsPerBlock, 7)
+
+block:
+  ## `cost > 0`, `cost <= team soup`, and the soup is deducted AT SUBMIT TIME.
+  var w = newWorld(flat(9, 9), 1500)
+  let id = w.spawnRobot(rtMiner, loc(4, 4), teamA)
+  let r = w.robotsById[id]
+  w.stats.soup[0] = 100
+  check("a zero-cost transaction is refused", not w.canSubmitTransaction(r, 0))
+  check("a negative cost is refused", not w.canSubmitTransaction(r, -5))
+  check("a cost above the pool is refused",
+    not w.canSubmitTransaction(r, 101))
+  check("and one the pool can pay is allowed", w.canSubmitTransaction(r, 40))
+  w.submitTransaction(r, msg(1), 40)
+  checkEq("the soup came out at submit time", w.stats.soup[0], 60)
+  checkEq("and the pool holds one transaction", w.txPool.len, 1)
+  checkEq("submitted is counted", w.stats.transactionsSent[0], 1)
+  checkEq("minted is NOT yet", w.stats.blockchainsSent[0], 0)
+
+block:
+  ## Comparator order: cost DESC, then id DESC, then the serialized message
+  ## ASCENDING. `serializedMessage` is the seven ints joined by `_`.
+  var pool: seq[Transaction]
+  pool.add(newTransaction(5, msg(9), 100'i32, 0))
+  pool.add(newTransaction(9, msg(1), 1'i32, 0))
+  pool.add(newTransaction(5, msg(8), 200'i32, 1))
+  let minted = mintBlock(pool, 7)
+  checkEq("every transaction minted", minted.len, 3)
+  checkEq("the highest cost is first", minted[0].cost, 9)
+  checkEq("then the higher id among equal costs", minted[1].id, 200'i32)
+  checkEq("and the lower id last", minted[2].id, 100'i32)
+  checkEq("the pool is drained", pool.len, 0)
+
+  var tie: seq[Transaction]
+  var lo = msg(1)
+  var hi = msg(1)
+  hi[6] = 2
+  tie.add(newTransaction(3, hi, 7'i32, 0))
+  tie.add(newTransaction(3, lo, 7'i32, 0))
+  let tied = mintBlock(tie, 7)
+  checkEq("a full id tie breaks on the lexicographically earlier message",
+    tied[0].serialized, "1_1_1_1_1_1_1")
+
+block:
+  ## At most seven a round; the rest STAY ELIGIBLE FOR EVER, and
+  ## `blockchainsSent` counts MINTED, not submitted.
+  var w = newWorld(flat(9, 9), 1500)
+  let id = w.spawnRobot(rtMiner, loc(4, 4), teamA)
+  let r = w.robotsById[id]
+  w.stats.soup[0] = 10_000
+  for i in 1 .. 10:
+    w.submitTransaction(r, msg(i), i)
+  checkEq("ten submitted", w.stats.transactionsSent[0], 10)
+  w.currentRound = 1
+  w.processBlockchain()
+  checkEq("seven minted this round", w.stats.blockchainsSent[0], 7)
+  checkEq("three still in the pool", w.txPool.len, 3)
+  checkEq("and the block carries seven", w.blockchain[0].len, 7)
+  checkEq("the most expensive went first", w.blockchain[0][0].cost, 10)
+  w.currentRound = 2
+  w.processBlockchain()
+  checkEq("the leftovers mint next round", w.stats.blockchainsSent[0], 10)
+  checkEq("and the pool is empty", w.txPool.len, 0)
+
+block:
+  ## `getBlock` refuses non-positive rounds and the CURRENT round.
+  var w = newWorld(flat(9, 9), 1500)
+  w.currentRound = 3
+  w.blockchain = @[@[], @[], @[]]
+  checkEq("round 0 is refused", w.getBlock(0).len, 0)
+  checkEq("the current round is refused", w.getBlock(3).len, 0)
+  checkEq("a past round is allowed", w.getBlock(1).len, 0)
+
+block:
+  ## THE QUIRK. `RobotControllerImpl.random` is a Java `private static Random`
+  ## assigned `new Random(gameWorld.getMapSeed())` IN THE CONSTRUCTOR, so it is
+  ## re-seeded on EVERY SPAWN. This vector fails if the RNG is seeded once.
+  var w = newWorld(flat(9, 9), 1500)
+  w.stats.soup[0] = 10_000
+  let a = w.spawnRobot(rtMiner, loc(1, 1), teamA)
+  ## Draw the first id from a fresh stream, for reference.
+  var reference = initJavaRandom(w.map.randomSeed)
+  let firstDraw = reference.nextInt()
+  w.submitTransaction(w.robotsById[a], msg(1), 1)
+  checkEq("the first transaction id is the first draw of a fresh stream",
+    w.txPool[0].id, firstDraw)
+
+  ## Now spawn another robot; the static RNG is re-seeded, so the NEXT
+  ## transaction id is the FIRST draw again, not the second.
+  discard w.spawnRobot(rtMiner, loc(2, 2), teamA)
+  w.submitTransaction(w.robotsById[a], msg(2), 1)
+  checkEq("a spawn RE-SEEDS the transaction RNG", w.txPool[1].id, firstDraw)
+
+  ## And with no spawn in between the stream advances normally.
+  let secondDraw = reference.nextInt()
+  w.submitTransaction(w.robotsById[a], msg(3), 1)
+  checkEq("without a spawn the stream advances", w.txPool[2].id, secondDraw)
+  check("which is a different value", secondDraw != firstDraw)
+
+finish("test_bc20_blockchain")
diff --git a/tests/test_bc20_burial.nim b/tests/test_bc20_burial.nim
new file mode 100644
index 0000000..c75d0a0
--- /dev/null
+++ b/tests/test_bc20_burial.nim
@@ -0,0 +1,77 @@
+## Burial: fifty dirt kills an HQ, the end-of-round ladder awards
+## `hq_destroyed` in the SAME round, the released dirt raises the tile, and a
+## double HQ loss falls through to `quantity`.
+
+import harness
+import battlecode/years/bc20/[constants, flood, world]
+
+proc flat(width, height, elevation: int): MapSpec =
+  result.name = "flat"
+  result.width = width
+  result.height = height
+  result.symmetry = symRotational
+  result.randomSeed = 4242
+  for i in 0 ..< width * height:
+    result.elevation.add(elevation)
+    result.water.add(false)
+    result.pollution.add(0)
+    result.soup.add(0)
+
+proc bury(w: World, target: Loc, from0: Loc) =
+  let landId = w.spawnRobot(rtLandscaper, from0, teamA)
+  let r = w.robotsById[landId]
+  for i in 1 .. 60:
+    r.dirtCarrying = 25
+    r.cooldownTurns = 0.0'f32
+    w.depositDirt(r, fromDelta(target.x - from0.x, target.y - from0.y))
+    if w.getRobot(target) == nil: break
+
+block:
+  var w = newWorld(flat(11, 11, 5), 1500)
+  let hqB = w.spawnRobot(rtHq, loc(5, 5), teamB)
+  discard w.spawnRobot(rtHq, loc(1, 1), teamA)
+  checkEq("an HQ takes fifty dirt", RobotSpecs[rtHq].dirtLimit, 50)
+  w.bury(loc(5, 5), loc(4, 5))
+  check("the HQ is gone", hqB notin w.robotsById)
+  check("and team B is recorded as having lost it", w.stats.destroyedHq[1])
+  checkEq("the released 50 dirt raised the tile", w.getDirt(loc(5, 5)),
+    5 + RobotSpecs[rtHq].dirtLimit)
+
+  ## The ladder awards `hq_destroyed` to the other team in the same round.
+  w.checkEndOfMatch()
+  check("a winner was set", w.hasWinner)
+  checkEq("and it is the other team", w.winner, teamA)
+  checkEq("on hq_destroyed", $w.domination, "hq_destroyed")
+
+block:
+  ## A DOUBLE HQ loss in one round is not `hq_destroyed`: the ladder falls
+  ## through to `quantity`.
+  var w = newWorld(flat(11, 11, 5), 1500)
+  let hqA = w.spawnRobot(rtHq, loc(1, 1), teamA)
+  let hqB = w.spawnRobot(rtHq, loc(9, 9), teamB)
+  discard w.spawnRobot(rtMiner, loc(2, 2), teamA)
+  w.destroyRobot(hqA)
+  w.destroyRobot(hqB)
+  check("both HQs are recorded lost",
+    w.stats.destroyedHq[0] and w.stats.destroyedHq[1])
+  w.checkEndOfMatch()
+  check("a winner was still set", w.hasWinner)
+  checkEq("but not on hq_destroyed", $w.domination, "quantity")
+  checkEq("and it is the side with more robots", w.winner, teamA)
+
+block:
+  ## An HQ that is never walled DROWNS, and the cause is recorded as such.
+  var spec = flat(11, 11, 0)
+  spec.water[0] = true
+  var w = newWorld(spec, 1500)
+  let hqA = w.spawnRobot(rtHq, loc(1, 1), teamA)
+  discard w.spawnRobot(rtHq, loc(9, 9), teamB)
+  w.currentRound = 300
+  w.updateWaterLevel()
+  for i in 1 .. 4:
+    w.floodfill()
+  check("the HQ drowned", hqA notin w.robotsById)
+  checkEq("with the cause recorded", w.hqLostCause[0], "drowned")
+  check("and the round recorded", w.hqLostRound[0] >= 0)
+
+finish("test_bc20_burial")
diff --git a/tests/test_bc20_cows.nim b/tests/test_bc20_cows.nim
new file mode 100644
index 0000000..85eb34f
--- /dev/null
+++ b/tests/test_bc20_cows.nim
@@ -0,0 +1,110 @@
+## The NPC cows: the seed, the four draws, the early exit, the odd-id
+## reversal, and the symmetry the reversal reads.
+
+import harness
+import battlecode/rng
+import battlecode/years/bc20/[constants, cows, maps, world]
+
+proc flat(width, height: int, wet: seq[int] = @[]): MapSpec =
+  result.name = "flat"
+  result.width = width
+  result.height = height
+  result.symmetry = symRotational
+  result.randomSeed = 43223
+  for i in 0 ..< width * height:
+    result.elevation.add(0)
+    result.water.add(i in wet)
+    result.pollution.add(0)
+    result.soup.add(0)
+
+block:
+  ## `new Random(84307 * mapSeed + 20201 * (cowId / 2))`, in Java `int`
+  ## arithmetic, WHICH OVERFLOWS: 84307 * 43223 alone is 3 644 001 461. Java
+  ## wraps; a checked conversion would raise on exactly the seeds that matter.
+  checkEq("the wrapped product for map seed 43223 and cow 0",
+    cowSeed(43223, 0), int(cast[int32](3644001461'u32)))
+  checkEq("cow 1 shares cow 0's seed (id / 2)", cowSeed(43223, 1),
+    cowSeed(43223, 0))
+  checkEq("cow 2 does not", cowSeed(43223, 2),
+    int(cast[int32](3644001461'u32 + 20201'u32)))
+
+block:
+  ## A READY cow draws up to four directions and STOPS THE MOMENT IT MOVES.
+  var w = newWorld(flat(9, 9), 1500)
+  let id = w.spawnRobot(6, rtCow, loc(4, 4), teamNeutral)
+  let cow = w.robotsById[id]
+  cow.cooldownTurns = 0.0'f32
+  var reference = initJavaRandom(cowSeed(w.map.randomSeed, 6))
+  ## On an empty flat map the first draw is always legal, so exactly ONE
+  ## nextDouble is consumed.
+  let firstDir = MoveDirs[int(reference.nextDouble() * 8.0)]
+  w.runCow(cow)
+  checkEq("the cow moved in the first drawn direction", cow.loc,
+    loc(4, 4) + firstDir)
+  var after = w.cowRand[id]
+  var fresh = initJavaRandom(cowSeed(w.map.randomSeed, 6))
+  discard fresh.nextDouble()
+  checkEq("and exactly one draw was consumed", after.seed, fresh.seed)
+
+block:
+  ## A cow that is NOT ready burns exactly four `nextDouble` calls and does
+  ## nothing.
+  var w = newWorld(flat(9, 9), 1500)
+  let id = w.spawnRobot(6, rtCow, loc(4, 4), teamNeutral)
+  let cow = w.robotsById[id]
+  cow.cooldownTurns = 5.0'f32
+  w.runCow(cow)
+  checkEq("it did not move", cow.loc, loc(4, 4))
+  var fresh = initJavaRandom(cowSeed(w.map.randomSeed, 6))
+  for i in 1 .. 4: discard fresh.nextDouble()
+  checkEq("and burned exactly four draws", w.cowRand[id].seed, fresh.seed)
+
+block:
+  ## An ODD id reverses the drawn direction through the map symmetry.
+  for sym in [symVertical, symHorizontal, symRotational]:
+    var w = newWorld(flat(9, 9), 1500)
+    w.symmetry = sym
+    checkEq("north reverses correctly under " & $sym,
+      w.reverseDirection(dNorth),
+      (case sym
+       of symVertical: dNorth
+       of symHorizontal: dSouth
+       of symRotational: dSouth))
+    checkEq("east reverses correctly under " & $sym,
+      w.reverseDirection(dEast),
+      (case sym
+       of symVertical: dWest
+       of symHorizontal: dEast
+       of symRotational: dWest))
+    checkEq("northeast reverses correctly under " & $sym,
+      w.reverseDirection(dNortheast),
+      (case sym
+       of symVertical: dNorthwest
+       of symHorizontal: dSoutheast
+       of symRotational: dSouthwest))
+
+block:
+  ## A cow never walks into water.
+  var w = newWorld(flat(5, 5, @[0, 1, 2, 3, 4, 5, 9, 10, 14, 15, 19,
+                                20, 21, 22, 23, 24]), 1500)
+  let id = w.spawnRobot(6, rtCow, loc(2, 2), teamNeutral)
+  let cow = w.robotsById[id]
+  for turn in 1 .. 50:
+    cow.cooldownTurns = 0.0'f32
+    w.runCow(cow)
+    if cow.dead: break
+  check("the cow is still alive", not cow.dead)
+  check("and stayed on dry land", not w.isFlooded(cow.loc))
+
+block:
+  ## The sim's own symmetry detector agrees with the converter's committed
+  ## value on every map in the variant's pool, on round 1.
+  for name in MixedPool:
+    let spec = loadMap(name)
+    let w = newWorld(spec, 1500)
+    checkEq("the sim recomputes " & name & "'s symmetry as committed",
+      w.symmetry, spec.symmetry)
+    checkEq("and a fresh recomputation agrees: " & name,
+      w.recomputeSymmetry(), spec.symmetry)
+
+finish("test_bc20_cows")
diff --git a/tests/test_bc20_dirt.nim b/tests/test_bc20_dirt.nim
new file mode 100644
index 0000000..edee934
--- /dev/null
+++ b/tests/test_bc20_dirt.nim
@@ -0,0 +1,126 @@
+## Dirt: dig, deposit, the 25-carry limit, burying a building at its health,
+## the released dirt, and `MAX_DIRT_DIFFERENCE` gating movement and placement
+## but never a drone.
+
+import harness
+import battlecode/years/bc20/[constants, maps, world]
+
+proc flat(width, height, elevation: int, wet: seq[int] = @[]): MapSpec =
+  result.name = "flat"
+  result.width = width
+  result.height = height
+  result.symmetry = symRotational
+  result.randomSeed = 4242
+  for i in 0 ..< width * height:
+    result.elevation.add(elevation)
+    result.water.add(i in wet)
+    result.pollution.add(0)
+    result.soup.add(0)
+
+proc ready(w: World, r: Robot) = r.cooldownTurns = 0.0'f32
+
+block:
+  ## Dig lowers an empty tile by 1 and raises `dirtCarrying`, to at most 25.
+  var w = newWorld(flat(9, 9, 5), 1500)
+  let id = w.spawnRobot(rtLandscaper, loc(4, 4), teamA)
+  let r = w.robotsById[id]
+  for i in 1 .. 25:
+    w.ready(r)
+    w.digDirt(r, dEast)
+  checkEq("the landscaper is full at the dirt limit", r.dirtCarrying, 25)
+  checkEq("and the tile went down by 25", w.getDirt(loc(5, 4)), 5 - 25)
+  w.ready(r)
+  check("a full landscaper cannot dig", not w.canDigDirt(r, dEast))
+  w.ready(r)
+  w.depositDirt(r, dWest)
+  checkEq("a deposit costs one carried dirt", r.dirtCarrying, 24)
+  checkEq("and raises the target tile", w.getDirt(loc(3, 4)), 6)
+  checkEq("the team's dirt-moved counter counts both",
+    w.stats.dirtMoved[0], 26)
+
+block:
+  ## Dig on a CLEAN building is illegal; on a dirty one it takes 1 off the
+  ## building, not off the ground.
+  var w = newWorld(flat(9, 9, 5), 1500)
+  let landId = w.spawnRobot(rtLandscaper, loc(4, 4), teamA)
+  let gunId = w.spawnRobot(rtNetGun, loc(5, 4), teamA)
+  let r = w.robotsById[landId]
+  let gun = w.robotsById[gunId]
+  w.ready(r)
+  check("digging out from under a clean building is illegal",
+    not w.canDigDirt(r, dEast))
+  gun.dirtCarrying = 4
+  w.ready(r)
+  check("but a dirty building can be dug out", w.canDigDirt(r, dEast))
+  w.digDirt(r, dEast)
+  checkEq("the dirt came off the BUILDING", gun.dirtCarrying, 3)
+  checkEq("and not off the ground", w.getDirt(loc(5, 4)), 5)
+
+block:
+  ## Deposit on a building adds 1 and DESTROYS it at its health, releasing
+  ## that much dirt onto the vacated tile.
+  var w = newWorld(flat(9, 9, 5), 1500)
+  let landId = w.spawnRobot(rtLandscaper, loc(4, 4), teamA)
+  let gunId = w.spawnRobot(rtNetGun, loc(5, 4), teamB)
+  let r = w.robotsById[landId]
+  r.dirtCarrying = 25
+  for i in 1 .. RobotSpecs[rtNetGun].dirtLimit:
+    w.ready(r)
+    w.depositDirt(r, dEast)
+  check("the net gun is buried at 15 dirt", gunId notin w.robotsById)
+  checkEq("and the 15 dirt landed on the tile", w.getDirt(loc(5, 4)), 5 + 15)
+
+block:
+  ## An HQ needs FIFTY dirt, and the burial is recorded as such.
+  var w = newWorld(flat(9, 9, 5), 1500)
+  let hqId = w.spawnRobot(rtHq, loc(5, 4), teamB)
+  let landId = w.spawnRobot(rtLandscaper, loc(4, 4), teamA)
+  let r = w.robotsById[landId]
+  for i in 1 .. RobotSpecs[rtHq].dirtLimit:
+    r.dirtCarrying = 25
+    w.ready(r)
+    w.depositDirt(r, dEast)
+    if hqId notin w.robotsById: break
+  check("the HQ is buried", hqId notin w.robotsById)
+  check("team B's HQ is recorded destroyed", w.stats.destroyedHq[1])
+  checkEq("with the cause recorded as burial", w.hqLostCause[1], "buried")
+
+block:
+  ## A dying landscaper drops its carry onto its own tile.
+  var w = newWorld(flat(9, 9, 5), 1500)
+  let id = w.spawnRobot(rtLandscaper, loc(4, 4), teamA)
+  w.robotsById[id].dirtCarrying = 7
+  w.destroyRobot(id)
+  checkEq("the carried dirt landed where it died", w.getDirt(loc(4, 4)),
+    5 + 7)
+
+block:
+  ## MAX_DIRT_DIFFERENCE gates movement and non-drone placement, never a drone.
+  var w = newWorld(flat(9, 9, 0), 1500)
+  w.elevation[w.idx(loc(5, 4))] = MaxDirtDifference + 1
+  let minerId = w.spawnRobot(rtMiner, loc(4, 4), teamA)
+  let droneId = w.spawnRobot(rtDeliveryDrone, loc(4, 5), teamA)
+  w.ready(w.robotsById[minerId])
+  w.ready(w.robotsById[droneId])
+  check("a miner cannot step up four", not w.canMove(w.robotsById[minerId], dEast))
+  w.elevation[w.idx(loc(5, 4))] = MaxDirtDifference
+  check("but it can step up three", w.canMove(w.robotsById[minerId], dEast))
+  w.elevation[w.idx(loc(5, 5))] = 40
+  check("a drone ignores the elevation step entirely",
+    w.canMove(w.robotsById[droneId], dEast))
+
+  ## Placement: the same gate, and the same drone exemption.
+  var w2 = newWorld(flat(9, 9, 0), 1500)
+  w2.elevation[w2.idx(loc(5, 4))] = MaxDirtDifference + 1
+  w2.stats.soup[0] = 10_000
+  let fcId = w2.spawnRobot(rtFulfillmentCenter, loc(4, 4), teamA)
+  let mineId = w2.spawnRobot(rtMiner, loc(4, 6), teamA)
+  w2.ready(w2.robotsById[fcId])
+  w2.ready(w2.robotsById[mineId])
+  check("a miner cannot found a building four steps up",
+    not w2.canBuildRobot(w2.robotsById[mineId], rtNetGun, dSouth) or
+    w2.getDirtDifference(loc(4, 6), loc(4, 5)) <= MaxDirtDifference)
+  check("a fulfillment center can drop a drone four steps up",
+    w2.canBuildRobot(w2.robotsById[fcId], rtDeliveryDrone, dEast))
+
+finish("test_bc20_dirt")
diff --git a/tests/test_bc20_drone.nim b/tests/test_bc20_drone.nim
new file mode 100644
index 0000000..c03f585
--- /dev/null
+++ b/tests/test_bc20_drone.nim
@@ -0,0 +1,121 @@
+## The delivery drone: pickup radius, what may and may not be lifted, the
+## blocked rider, the drop, and what a dying drone does with its cargo.
+
+import harness
+import battlecode/years/bc20/[constants, world]
+
+proc flat(width, height, elevation: int, wet: seq[int] = @[]): MapSpec =
+  result.name = "flat"
+  result.width = width
+  result.height = height
+  result.symmetry = symRotational
+  result.randomSeed = 4242
+  for i in 0 ..< width * height:
+    result.elevation.add(elevation)
+    result.water.add(i in wet)
+    result.pollution.add(0)
+    result.soup.add(0)
+
+proc ready(w: World, r: Robot) = r.cooldownTurns = 0.0'f32
+
+block:
+  ## Pickup radius squared is 3, and only UNITS may be lifted.
+  var w = newWorld(flat(11, 11, 0), 1500)
+  let droneId = w.spawnRobot(rtDeliveryDrone, loc(5, 5), teamA)
+  let drone = w.robotsById[droneId]
+  let nearId = w.spawnRobot(rtMiner, loc(6, 6), teamB)      ## d2 = 2
+  let farId = w.spawnRobot(rtMiner, loc(7, 7), teamB)       ## d2 = 8
+  let gunId = w.spawnRobot(rtNetGun, loc(4, 5), teamB)      ## a BUILDING
+  let otherId = w.spawnRobot(rtDeliveryDrone, loc(5, 6), teamB)
+  w.ready(drone)
+  checkEq("the pickup radius squared is 3", DeliveryDronePickupRadiusSquared, 3)
+  check("a unit at d2 = 2 can be picked up", w.canPickUpUnit(drone, nearId))
+  check("a unit at d2 = 8 cannot", not w.canPickUpUnit(drone, farId))
+  check("a building can never be picked up", not w.canPickUpUnit(drone, gunId))
+  check("and neither can another drone", not w.canPickUpUnit(drone, otherId))
+
+block:
+  ## The held unit is BLOCKED — no turn, cooldown frozen — and rides with the
+  ## drone.
+  var w = newWorld(flat(11, 11, 0), 1500)
+  let droneId = w.spawnRobot(rtDeliveryDrone, loc(5, 5), teamA)
+  let riderId = w.spawnRobot(rtLandscaper, loc(5, 6), teamB)
+  let drone = w.robotsById[droneId]
+  let rider = w.robotsById[riderId]
+  rider.cooldownTurns = 4.0'f32
+  w.ready(drone)
+  w.pickUpUnit(drone, riderId)
+  check("the drone holds a unit", drone.holdingUnit)
+  checkEq("and knows which", drone.heldId, riderId)
+  check("the rider is blocked", rider.blocked)
+  checkEq("the rider rides at the drone's tile", rider.loc, drone.loc)
+  check("the rider's old tile is empty", w.getRobot(loc(5, 6)) == nil)
+  checkEq("the drone's pickup counter moved", w.stats.dronePickups[0], 1)
+  ## A blocked robot never runs `processBeginningOfTurn`, so its cooldown does
+  ## not decay — the round loop skips it entirely. Assert the invariant the
+  ## loop relies on.
+  checkEq("the rider's cooldown is frozen where it was",
+    rider.cooldownTurns, 4.0'f32)
+
+  ## Moving the drone moves the rider.
+  w.ready(drone)
+  w.move(drone, dNorth)
+  checkEq("the rider follows the drone", rider.loc, drone.loc)
+
+  ## A drop needs an unoccupied, on-map tile.
+  w.ready(drone)
+  discard w.spawnRobot(rtMiner, drone.loc + dEast, teamA)
+  check("a drop onto an occupied tile is refused",
+    not w.canDropUnit(drone, dEast))
+  check("but a clear tile is fine", w.canDropUnit(drone, dWest))
+  w.dropUnit(drone, dWest)
+  check("the rider is unblocked", not rider.blocked)
+  check("and the drone is empty", not drone.holdingUnit)
+
+block:
+  ## A drop into water destroys a non-drone, and counts as a water drop when
+  ## the victim is an enemy.
+  var w = newWorld(flat(11, 11, 0, @[5 + 11 * 4]), 1500)
+  let droneId = w.spawnRobot(rtDeliveryDrone, loc(5, 5), teamA)
+  let riderId = w.spawnRobot(rtLandscaper, loc(6, 5), teamB)
+  let drone = w.robotsById[droneId]
+  w.ready(drone)
+  w.pickUpUnit(drone, riderId)
+  w.ready(drone)
+  w.dropUnit(drone, dSouth)
+  check("the enemy landscaper drowned", riderId notin w.robotsById)
+  checkEq("and it is recorded as a water drop", w.stats.droneWaterDrops[0], 1)
+
+block:
+  ## A dying drone drops its cargo on its OWN tile — and the cargo drowns if
+  ## that tile is water.
+  var w = newWorld(flat(11, 11, 0), 1500)
+  let droneId = w.spawnRobot(rtDeliveryDrone, loc(5, 5), teamA)
+  let riderId = w.spawnRobot(rtMiner, loc(6, 5), teamB)
+  let drone = w.robotsById[droneId]
+  w.ready(drone)
+  w.pickUpUnit(drone, riderId)
+  w.destroyRobot(droneId)
+  check("the rider survived", riderId in w.robotsById)
+  checkEq("and stands where the drone died", w.robotsById[riderId].loc,
+    loc(5, 5))
+  check("and is unblocked", not w.robotsById[riderId].blocked)
+  check("and is back on the grid", w.getRobot(loc(5, 5)) != nil)
+
+block:
+  ## A carried COW stops polluting: `processEndOfTurn` never runs for a
+  ## blocked body, and `updateRobot` clears its effect instead.
+  var w = newWorld(flat(11, 11, 0), 1500)
+  let droneId = w.spawnRobot(rtDeliveryDrone, loc(5, 5), teamA)
+  let cowId = w.spawnRobot(rtCow, loc(6, 5), teamNeutral)
+  let cow = w.robotsById[cowId]
+  w.processEndOfTurn(cow)
+  check("a free cow pollutes", w.getPollution(loc(6, 5)) > 0)
+  let drone = w.robotsById[droneId]
+  w.ready(drone)
+  w.pickUpUnit(drone, cowId)
+  check("the cow is blocked", cow.blocked)
+  w.resetPollutionForRobot(cowId)
+  checkEq("and its pollution is cleared", w.getPollution(loc(6, 5)), 0)
+
+finish("test_bc20_drone")
diff --git a/tests/test_bc20_flood.nim b/tests/test_bc20_flood.nim
new file mode 100644
index 0000000..0fd0261
--- /dev/null
+++ b/tests/test_bc20_flood.nim
@@ -0,0 +1,113 @@
+## The rising water: the committed level table, the one-ring-per-round flood
+## fill, drowning, resurfacing and drone-drop survival.
+
+import std/strutils
+import harness
+import battlecode/years/bc20/[constants, flood, maps, world]
+
+# --- the committed table matches the spec's own checkpoints ------------------
+block:
+  ## `GameConstants.getWaterLevel` is generated under the CI JDK into
+  ## `data/bc20/water_levels.json` as float32 bit patterns; these are the
+  ## rounds the 2020 spec itself quotes.
+  checkEq("elevation 1 floods at round 256", roundWaterReaches(1), 256)
+  checkEq("elevation 2 floods at round 464", roundWaterReaches(2), 464)
+  checkEq("elevation 3 floods at round 677", roundWaterReaches(3), 677)
+  checkEq("elevation 4 floods at round 931", roundWaterReaches(4), 931)
+  checkEq("elevation 5 floods at round 1210", roundWaterReaches(5), 1210)
+  checkEq("elevation 6 floods at round 1413", roundWaterReaches(6), 1413)
+  check("elevation 7 is outside the 1500-round cap",
+    roundWaterReaches(7) > 1500)
+  checkEq("round 0 is dry", waterLevelAt(0), 0.0'f32)
+  check("the level rises monotonically over the whole table", (block:
+    var ok = true
+    var prev = waterLevelAt(0)
+    for r in 1 .. WaterTableMaxRound:
+      let here = waterLevelAt(r)
+      if here < prev: ok = false
+      prev = here
+    ok))
+
+# --- a hand-built world -----------------------------------------------------
+proc flat(width, height, elevation: int, wet: seq[int] = @[]): MapSpec =
+  result.name = "flat"
+  result.width = width
+  result.height = height
+  result.symmetry = symRotational
+  result.randomSeed = 4242
+  result.initialWater = 0
+  for i in 0 ..< width * height:
+    result.elevation.add(elevation)
+    result.water.add(i in wet)
+    result.pollution.add(0)
+    result.soup.add(0)
+
+block:
+  ## The flood advances EXACTLY ONE RING per round, because the origin set is
+  ## snapshotted before anything changes.
+  var w = newWorld(flat(9, 9, 0, @[4 + 9 * 4]), 1500)
+  w.currentRound = 300
+  w.updateWaterLevel()
+  check("the water is above elevation 0", w.waterLevel > 0.0'f32)
+  checkEq("one flooded tile to start", w.floodedCount, 1)
+  w.floodfill()
+  checkEq("one ring after one fill", w.floodedCount, 9)
+  w.floodfill()
+  checkEq("two rings after two fills", w.floodedCount, 25)
+  w.floodfill()
+  checkEq("three rings after three fills", w.floodedCount, 49)
+
+block:
+  ## A non-flying robot on a newly flooded tile dies; a drone does not.
+  var w = newWorld(flat(7, 7, 0, @[0]), 1500)
+  w.currentRound = 300
+  w.updateWaterLevel()
+  let minerId = w.spawnRobot(rtMiner, loc(1, 0), teamA)
+  let droneId = w.spawnRobot(rtDeliveryDrone, loc(0, 1), teamA)
+  w.floodfill()
+  check("the miner drowned", minerId notin w.robotsById)
+  check("the drone did not", droneId in w.robotsById)
+
+block:
+  ## A deposit that lifts a tile to `elevation >= waterLevel` resurfaces it in
+  ## the same action (`tryResurface`).
+  var w = newWorld(flat(7, 7, 0, @[3 + 7 * 3]), 1500)
+  w.currentRound = 250
+  w.updateWaterLevel()
+  check("the water is under elevation 1", w.waterLevel < 1.0'f32)
+  check("the tile starts flooded", w.isFlooded(loc(3, 3)))
+  w.addDirt(loc(3, 3), 1)
+  check("and resurfaces the moment the dirt lands",
+    not w.isFlooded(loc(3, 3)))
+  checkEq("the flooded count follows", w.floodedCount, 0)
+
+block:
+  ## The initial flooded set comes from the map's own `water` array.
+  let spec = loadMap("WateredDown")
+  var w = newWorld(spec, 1500)
+  var expected = 0
+  for wet in spec.water:
+    if wet: expected += 1
+  checkEq("the initial flooded set is the map's", w.floodedCount, expected)
+  checkEq("and the water starts at the map's initialWater",
+    w.waterLevel, float32(spec.initialWater))
+
+block:
+  ## A drone dropped into water survives; a miner does not.
+  var w = newWorld(flat(7, 7, 0, @[0, 1, 2, 3, 4, 5, 6]), 1500)
+  let droneId = w.spawnRobot(rtDeliveryDrone, loc(3, 2), teamA)
+  let minerId = w.spawnRobot(rtMiner, loc(3, 3), teamA)
+  let drone = w.robotsById[droneId]
+  drone.cooldownTurns = 0
+  w.pickUpUnit(drone, minerId)
+  check("the miner is held", drone.holdingUnit)
+  check("and is blocked", w.robotsById[minerId].blocked)
+  drone.cooldownTurns = 0
+  ## Fly the drone over the water and drop.
+  drone.loc = loc(3, 1)
+  w.robotsById[minerId].loc = loc(3, 1)
+  w.dropUnit(drone, dSouth)
+  check("the miner dropped into water died", minerId notin w.robotsById)
+  check("and the drone is still flying", droneId in w.robotsById)
+
+finish("test_bc20_flood")
diff --git a/tests/test_bc20_knobs.nim b/tests/test_bc20_knobs.nim
new file mode 100644
index 0000000..ed4729f
--- /dev/null
+++ b/tests/test_bc20_knobs.nim
@@ -0,0 +1,184 @@
+## THE bc20 KNOB-TEETH GATE.
+##
+## Every one of the ten knobs must visibly change play. For each, this shard
+## plays a paired set of seeded games — identical map, identical opponent, the
+## two sides identical except that knob at its LOW and HIGH setting — and
+## asserts a named, SIGNED statistic moves. A knob that is inert fails the
+## build.
+##
+## The paired set is two `small`-pool maps under both side assignments, i.e.
+## four games per setting. The episode seed only chooses maps and sides — the
+## world RNG comes from the MAP's own `randomSeed` — so those four games are
+## every distinct game these inputs can produce, and adding "more seeds" would
+## add duplicates, not information.
+##
+## The thresholds live in ONE table so tuning is a one-line change, and each is
+## set at roughly half the measured delta so a real regression trips it and
+## ordinary drift does not. Measured at GameVersion GV04:
+##
+##   knob                     low -> high              measured        gate
+##   opening                  turtle -> rush           adj 0 -> 2      >= 1
+##   terraform_start_round    900 -> 100               dirt 761->6286  +150 %
+##   lattice_radius           3 -> 10                  raised 163->380 +60
+##   landscaper_count_curve   lean -> swarm            land 14 -> 43   +50 %
+##   miner_count_curve        lean -> swarm            miners 32->100  +50 %
+##   vaporator_budget         0 -> 6                   vap 0 -> 1      >= 1
+##                                                     poll 1173->696  -3
+##   drone_role               carry -> harass          drops 0 -> 20   +5
+##   net_gun_ring             0 -> 6                   guns 0 -> 15    +4
+##   rush_trigger             0 -> 220                 adj 0 -> 1      >= 1
+##   wall_hq_round            0 -> 250                 drowned 4 -> 0
+##                                                     ring 0 -> 32    +6
+##
+## DECLARED DEVIATION from the design note's table: `net_gun_ring` is gated on
+## net guns BUILT only, not additionally on enemy drones shot down. The HQ has
+## a built-in net gun and shoots on every turn it is ready, so `net_gun_kills`
+## barely moves when the ring is added — the counter cannot separate the ring's
+## kills from the HQ's, and inventing a second counter to make a gate pass
+## would be gating on the instrument rather than on the play.
+
+import std/strutils
+import harness
+import battlecode/[baselines, sheet]
+import battlecode/years/bc20/[constants, maps, rules, world]
+import battlecode/years/bc20/chassis/kit
+
+const
+  Maps = ["WateredDown", "ALandDivided"]
+  Chassis = [ckBowlOfChowder, ckBowlOfChowder]
+
+type Measured = object
+  landscapers, miners, drones, netGuns, vaporators: int
+  dirt, waterDrops, hqDrowned, ringAboveFive, raisedNearHq: int
+  reachedEnemyHq: int
+  pollutionAt1000: int
+
+proc runSet(knobs: string, rounds: int): Measured =
+  ## The knob under test on seat 0; the all-defaults doctrine on seat 1.
+  let sheet = parseReply("{\"sheet\":{" & knobs & "}}", YearBc20)
+  let opponent = baselineSheet("bc20", blBowlOfChowder)
+  for mapName in Maps:
+    for sideAslot in [0, 1]:
+      let spec = loadMap(mapName)
+      var w = newWorld(spec, rounds)
+      var sides = newSides([sheet, opponent], Chassis, sideAslot)
+      let team = if sideAslot == 0: 0 else: 1
+      let hqs = spec.hqLocations()
+      let mine = hqs[team]
+      let theirs = hqs[1 - team]
+      var reached = false
+      for round in 1 .. rounds:
+        runRound(w, sides, Chassis)
+        if not reached:
+          for id, r in w.robotsById:
+            if r.team == Team(team) and chebyshev(r.loc, theirs) <= 1:
+              reached = true
+              break
+        if round == 1000:
+          result.pollutionAt1000 += w.globalPollution
+        if not w.running: break
+      result.landscapers += w.stats.landscapersBuilt[team]
+      result.miners += w.stats.minersBuilt[team]
+      result.drones += w.stats.dronesBuilt[team]
+      result.netGuns += w.stats.netGunsBuilt[team]
+      result.vaporators += w.stats.vaporatorsBuilt[team]
+      result.dirt += w.stats.dirtMoved[team]
+      result.waterDrops += w.stats.droneWaterDrops[team]
+      if w.stats.destroyedHq[team]: result.hqDrowned += 1
+      if reached: result.reachedEnemyHq += 1
+      for l in w.ringTiles(mine):
+        if w.getDirt(l) >= 5: result.ringAboveFive += 1
+      for x in max(0, mine.x - 10) .. min(w.width - 1, mine.x + 10):
+        for y in max(0, mine.y - 10) .. min(w.height - 1, mine.y + 10):
+          if float32(w.getDirt(loc(x, y))) > w.waterLevel:
+            result.raisedNearHq += 1
+
+proc upByPercent(name: string, low, high, percent: int) =
+  check(name & " (" & $low & " -> " & $high & ", gate +" & $percent & "%)",
+    high >= low + max(1, low * percent div 100))
+
+# --- opening ----------------------------------------------------------------
+block:
+  let low = runSet("\"opening\":\"turtle\"", 700)
+  let high = runSet("\"opening\":\"rush\"", 700)
+  check("opening turtle -> rush puts a unit next to the enemy HQ (" &
+    $low.reachedEnemyHq & " -> " & $high.reachedEnemyHq & ")",
+    high.reachedEnemyHq >= low.reachedEnemyHq + 1)
+
+# --- terraform_start_round --------------------------------------------------
+block:
+  let low = runSet("\"terraform_start_round\":900", 700)
+  let high = runSet("\"terraform_start_round\":100", 700)
+  upByPercent("terraform_start_round 900 -> 100 moves more dirt by round 700",
+    low.dirt, high.dirt, 150)
+
+# --- lattice_radius ---------------------------------------------------------
+block:
+  let low = runSet("\"lattice_radius\":3", 900)
+  let high = runSet("\"lattice_radius\":10", 900)
+  check("lattice_radius 3 -> 10 raises more tiles above the water (" &
+    $low.raisedNearHq & " -> " & $high.raisedNearHq & ")",
+    high.raisedNearHq >= low.raisedNearHq + 60)
+
+# --- landscaper_count_curve -------------------------------------------------
+block:
+  let low = runSet("\"landscaper_count_curve\":\"lean\"", 900)
+  let high = runSet("\"landscaper_count_curve\":\"swarm\"", 900)
+  upByPercent("landscaper_count_curve lean -> swarm builds more landscapers",
+    low.landscapers, high.landscapers, 50)
+
+# --- miner_count_curve ------------------------------------------------------
+block:
+  let low = runSet("\"miner_count_curve\":\"lean\"", 900)
+  let high = runSet("\"miner_count_curve\":\"swarm\"", 900)
+  upByPercent("miner_count_curve lean -> swarm builds more miners",
+    low.miners, high.miners, 50)
+
+# --- vaporator_budget -------------------------------------------------------
+block:
+  let low = runSet("\"vaporator_budget\":0", 1050)
+  let high = runSet("\"vaporator_budget\":6", 1050)
+  check("vaporator_budget 0 -> 6 builds vaporators (" & $low.vaporators &
+    " -> " & $high.vaporators & ")",
+    low.vaporators == 0 and high.vaporators >= 1)
+  check("and global pollution at round 1000 is lower (" &
+    $low.pollutionAt1000 & " -> " & $high.pollutionAt1000 & ")",
+    high.pollutionAt1000 <= low.pollutionAt1000 - 3)
+
+# --- drone_role -------------------------------------------------------------
+block:
+  let low = runSet("\"drone_role\":\"carry_landscapers\"", 900)
+  let high = runSet("\"drone_role\":\"harass\"", 900)
+  check("drone_role carry_landscapers -> harass drops more enemies in the " &
+    "water (" & $low.waterDrops & " -> " & $high.waterDrops & ")",
+    high.waterDrops >= low.waterDrops + 5)
+
+# --- net_gun_ring -----------------------------------------------------------
+block:
+  let low = runSet("\"net_gun_ring\":0", 900)
+  let high = runSet("\"net_gun_ring\":6", 900)
+  checkEq("net_gun_ring 0 builds no net guns at all", low.netGuns, 0)
+  check("and net_gun_ring 6 builds them (" & $low.netGuns & " -> " &
+    $high.netGuns & ")", high.netGuns >= low.netGuns + 4)
+
+# --- rush_trigger -----------------------------------------------------------
+block:
+  let low = runSet("\"rush_trigger\":0", 500)
+  let high = runSet("\"rush_trigger\":220", 500)
+  check("rush_trigger 0 -> 220 puts a unit next to the enemy HQ by round " &
+    "500 (" & $low.reachedEnemyHq & " -> " & $high.reachedEnemyHq & ")",
+    high.reachedEnemyHq >= low.reachedEnemyHq + 1)
+
+# --- wall_hq_round ----------------------------------------------------------
+block:
+  let low = runSet("\"wall_hq_round\":0", 1250)
+  let high = runSet("\"wall_hq_round\":250", 1250)
+  check("wall_hq_round 0 drowns the HQ in every game (" & $low.hqDrowned &
+    " of 4)", low.hqDrowned == 4)
+  check("and wall_hq_round 250 drowns it in none (" & $high.hqDrowned &
+    " of 4)", high.hqDrowned == 0)
+  check("and the ring stands well above the round-250 water level (" &
+    $low.ringAboveFive & " -> " & $high.ringAboveFive & ")",
+    high.ringAboveFive >= low.ringAboveFive + 6)
+
+finish("test_bc20_knobs")
diff --git a/tests/test_bc20_maps.nim b/tests/test_bc20_maps.nim
new file mode 100644
index 0000000..0ac2fc3
--- /dev/null
+++ b/tests/test_bc20_maps.nim
@@ -0,0 +1,140 @@
+## The converted bc20 maps: every one re-converts identically (checked by
+## `tools/ci/check_bc20_maps.sh` in CI, and by shape here), the sizes and
+## symmetries match the pinned table, the sim's own per-spawn detector agrees
+## with the converter, and every array is `width x height`.
+
+import std/[algorithm, json, os, strutils, tables]
+import harness
+import battlecode/years/bc20/[constants, maps, world]
+
+const Pinned = {
+  "maptestsmall": (32, 32, "vertical"),
+  "WateredDown": (32, 32, "horizontal"),
+  "Infinity": (33, 33, "rotational"),
+  "Spiral": (33, 33, "rotational"),
+  "Hourglass": (40, 32, "horizontal"),
+  "ALandDivided": (41, 32, "vertical"),
+  "Climb": (40, 40, "rotational"),
+  "Constriction": (40, 40, "rotational"),
+  "CentralLake": (41, 41, "rotational"),
+  "Toothpaste": (45, 37, "rotational"),
+  "TwoLakeLand": (45, 45, "horizontal"),
+  "CentralSoup": (48, 48, "rotational"),
+  "Hills": (60, 60, "rotational"),
+  "OmgThisIsProcedural": (60, 64, "vertical"),
+  "Squares": (63, 63, "vertical"),
+  "BeachFrontProperty": (64, 64, "rotational"),
+  "Maze": (64, 64, "rotational"),
+  "TheHighGround": (64, 64, "rotational"),
+}.toTable
+  ## Read out of the real `.map20` flatbuffers, not assumed.
+
+block:
+  checkEq("the small pool has six maps", SmallPool.len, 6)
+  checkEq("the mixed pool has twelve", MixedPool.len, 12)
+  checkEq("the large pool has six", LargePool.len, 6)
+  for name in SmallPool:
+    check(name & " is also in the mixed pool", name in MixedPool)
+  var all: seq[string]
+  for pool in [@SmallPool, @MixedPool, @LargePool]:
+    for name in pool:
+      if name notin all: all.add(name)
+  checkEq("eighteen distinct maps are committed", all.len, 18)
+  check("CowFarm is deliberately excluded", "CowFarm" notin all)
+  check("and DidAMonkeyMakeThis too", "DidAMonkeyMakeThis" notin all)
+  checkEq("an unknown pool name is empty, not silently mixed",
+    poolNames("nonsense").len, 0)
+
+block:
+  for name, want in Pinned:
+    let spec = loadMap(name)
+    checkEq(name & " has the pinned width", spec.width, want[0])
+    checkEq(name & " has the pinned height", spec.height, want[1])
+    checkEq(name & " has the pinned symmetry",
+      ($spec.symmetry).replace("sym", "").toLowerAscii(), want[2])
+    let n = spec.width * spec.height
+    checkEq(name & "'s elevation array is width x height", spec.elevation.len, n)
+    checkEq(name & "'s water array is width x height", spec.water.len, n)
+    checkEq(name & "'s pollution array is width x height",
+      spec.pollution.len, n)
+    checkEq(name & "'s soup array is width x height", spec.soup.len, n)
+
+    var hqs = 0
+    for body in spec.initialBodies:
+      if body.kind == rtHq: inc hqs
+      check(name & "'s bodies are on the map",
+        body.loc.x >= 0 and body.loc.y >= 0 and
+        body.loc.x < spec.width and body.loc.y < spec.height)
+      if body.kind == rtCow:
+        checkEq(name & "'s cows are neutral", body.team, teamNeutral)
+      else:
+        check(name & "'s HQs belong to a side", body.team != teamNeutral)
+    checkEq(name & " has exactly two HQs", hqs, 2)
+
+    ## The spec says every map carries a tile at `MIN_WATER_ELEVATION`.
+    ## `Infinity` does not — its floor is -12 — and the port follows the FILE
+    ## rather than the prose (docs/RULES-BC20.md §Divergences item 11).
+    var lowest = high(int)
+    for e in spec.elevation: lowest = min(lowest, e)
+    if name == "Infinity":
+      checkEq("Infinity's real floor is -12, not MIN_WATER_ELEVATION",
+        lowest, -12)
+    else:
+      checkEq(name & " has a tile at MIN_WATER_ELEVATION", lowest,
+        MinWaterElevation)
+
+block:
+  ## The sim recomputes the symmetry on every NEUTRAL spawn from the CURRENT
+  ## world; it must land on the committed value for every map, on round 1.
+  for name, _ in Pinned:
+    let spec = loadMap(name)
+    let w = newWorld(spec, 1500)
+    checkEq("the sim agrees with the converter on " & name, w.symmetry,
+      spec.symmetry)
+
+block:
+  ## The committed JSON is the byte-stable form the converter emits: sorted
+  ## keys, no spaces, one trailing newline. CI re-converts and diffs; this
+  ## catches a hand-edit that never went through the converter at all.
+  for name, _ in Pinned:
+    let raw = readFile(mapPath(name))
+    check(name & "'s file ends in exactly one newline",
+      raw.endsWith("\n") and not raw.endsWith("\n\n"))
+    check(name & "'s file is compact JSON", ", " notin raw and ": " notin raw)
+    let doc = parseJson(raw)
+    var keys: seq[string]
+    for key, _ in doc: keys.add(key)
+    var sorted = keys
+    sorted.sort()
+    checkEq(name & "'s keys are sorted", keys, sorted)
+
+block:
+  ## The draw is deterministic in the episode seed, distinct, and inside the
+  ## pool; sides alternate every game.
+  let drawn = drawMaps("mixed", 871345, 3)
+  checkEq("three maps are drawn", drawn.len, 3)
+  check("all distinct",
+    drawn[0] != drawn[1] and drawn[1] != drawn[2] and drawn[0] != drawn[2])
+  for name in drawn:
+    check(name & " is in the mixed pool", name in MixedPool)
+  checkEq("and the draw is deterministic", drawMaps("mixed", 871345, 3), drawn)
+  for g in 0 .. 2:
+    checkEq("sides alternate at game " & $g, sideAslotFor(871345, g),
+      sideAslotFor(871345, 0) xor (g and 1))
+
+block:
+  ## The map card is what a doctrine plans against, and both seats see the
+  ## same numbers on a symmetric map.
+  let spec = loadMap("CentralLake")
+  let a = spec.mapCard(0, 0)
+  let b = spec.mapCard(1, 0)
+  checkEq("both seats see the same HQ elevation",
+    a["hq_elevation"].getInt(), b["hq_elevation"].getInt())
+  checkEq("and the same separation",
+    a["hq_separation"].getInt(), b["hq_separation"].getInt())
+  checkEq("only the side differs", a["you_are"].getStr(), "A")
+  checkEq("for the other seat", b["you_are"].getStr(), "B")
+  check("the card names the soup", a["soup_tiles"].getInt() > 0)
+  check("and the cows", a["cows"].getInt() >= 0)
+
+finish("test_bc20_maps")
diff --git a/tests/test_bc20_perf.nim b/tests/test_bc20_perf.nim
new file mode 100644
index 0000000..08de979
--- /dev/null
+++ b/tests/test_bc20_perf.nim
@@ -0,0 +1,79 @@
+## THE bc20 PERF GATE.
+##
+## A full 1499-round game on `CentralSoup` (48x48, the largest map in the
+## `bc20` variant's pool) with both scripted chassis must complete in <= 55 s.
+## The design note's sanctioned fix if this ever goes red is ONE config value —
+## `gamesPerMatch: 3 -> 1` in the `bc20` variant — not a redesign.
+##
+## The budget arithmetic this protects: the match guard is 320 s for three
+## games, so a single game must sit comfortably inside 100 s
+## (`perGameBudgetSeconds`) or a hosted episode settles `deadline` instead of
+## `complete`.
+
+import std/[monotimes, times]
+import harness
+import battlecode/[baselines, sheet]
+import battlecode/years/bc20/[maps, rules]
+
+const Budget = 55.0
+
+var largest = ""
+var largestTiles = 0
+for name in MixedPool:
+  let spec = loadMap(name)
+  if spec.width * spec.height > largestTiles:
+    largestTiles = spec.width * spec.height
+    largest = name
+echo "largest map in the bc20 pool: ", largest, " (", largestTiles, " tiles)"
+checkEq("and it is CentralSoup, as the design note pins", largest,
+  "CentralSoup")
+
+proc timeGame(sheets: array[2, Sheet],
+              chassis: array[2, ChassisKind]): (float, GameOutcome20) =
+  let started = getMonoTime()
+  let (w, outcome) = playGame(loadMap(largest), sheets, chassis, 0, 0, 1500, 0)
+  ((getMonoTime() - started).inMilliseconds.float / 1000.0, outcome)
+
+let boc = baselineSheet("bc20", blBowlOfChowder)
+let scaffold = baselineSheet("bc20", blExamplefuncsplayer)
+let ckBoc = parseChassis("bowl-of-chowder")
+let ckScaffold = parseChassis("examplefuncsplayer")
+
+block:
+  let (seconds, outcome) = timeGame([boc, boc], [ckBoc, ckBoc])
+  echo "bowl-of-chowder mirror: ", outcome.roundsPlayed, " rounds in ",
+    seconds, " s"
+  check("the mirror plays a full game in <= 55 s (" & $seconds & " s)",
+    seconds <= Budget)
+  checkEq("and it really ran to the cap", outcome.roundsPlayed, 1499)
+
+block:
+  let (seconds, outcome) = timeGame([scaffold, scaffold],
+    [ckScaffold, ckScaffold])
+  echo "scaffold mirror: ", outcome.roundsPlayed, " rounds in ", seconds, " s"
+  check("the scaffold mirror is inside the budget (" & $seconds & " s)",
+    seconds <= Budget)
+
+block:
+  ## The mixed pair, which is what `docker-smoke`'s bc20 episode runs.
+  let (seconds, outcome) = timeGame([boc, scaffold], [ckBoc, ckScaffold])
+  echo "bowl-of-chowder vs scaffold: ", outcome.roundsPlayed, " rounds in ",
+    seconds, " s"
+  check("the mixed pair is inside the budget (" & $seconds & " s)",
+    seconds <= Budget)
+
+block:
+  ## The `docker-smoke` bc20 episode itself: 300 rounds on the small pool,
+  ## which must finish in seconds and still outlast the viewer's 10 s soak.
+  let started = getMonoTime()
+  let (w, outcome) = playGame(loadMap("maptestsmall"), [boc, scaffold],
+    [ckBoc, ckScaffold], 0, 0, 300, 0)
+  let seconds = (getMonoTime() - started).inMilliseconds.float / 1000.0
+  echo "the smoke episode: ", outcome.roundsPlayed, " rounds in ", seconds, " s"
+  check("the smoke game is under 10 s (" & $seconds & " s)", seconds <= 10.0)
+  ## A 300-round game plays for ~12 s at 24 fps, so the recording outlasts the
+  ## viewer smoke's 10 s soak (the ecos 2026-08-23 scar).
+  check("and the recording outlasts the 10 s viewer soak",
+    outcome.roundsPlayed.float / 24.0 > 10.0)
+
+finish("test_bc20_perf")
diff --git a/tests/test_bc20_pollution.nim b/tests/test_bc20_pollution.nim
new file mode 100644
index 0000000..d58fc52
--- /dev/null
+++ b/tests/test_bc20_pollution.nim
@@ -0,0 +1,105 @@
+## Pollution: the global floor, the one-round refinery effect, the vaporator's
+## multiplicative scrub, cow haze, and both coefficients in Java `float`.
+
+import harness
+import battlecode/years/bc20/[constants, pollution, world]
+
+proc flat(width, height: int): MapSpec =
+  result.name = "flat"
+  result.width = width
+  result.height = height
+  result.symmetry = symRotational
+  result.randomSeed = 4242
+  for i in 0 ..< width * height:
+    result.elevation.add(0)
+    result.water.add(false)
+    result.pollution.add(0)
+    result.soup.add(0)
+
+block:
+  ## The closed forms, in float32, and `Math.round(float)` as `floor(x + 0.5)`.
+  checkEq("cooldownCoefficient(0)", cooldownCoefficient(0), 1.0'f32)
+  checkEq("cooldownCoefficient(2000)", cooldownCoefficient(2000), 2.0'f32)
+  checkEq("sensorCoefficient(0)", sensorCoefficient(0), 1.0'f32)
+  checkEq("sensorCoefficient(4000)", sensorCoefficient(4000), 0.25'f32)
+  checkEq("Math.round rounds a half UP", javaRoundF32(0.5'f32), 1)
+  checkEq("and a negative half toward positive infinity",
+    javaRoundF32(-0.5'f32), 0)
+  checkEq("javaRoundF32(2.49)", javaRoundF32(2.49'f32), 2)
+  checkEq("javaRoundF32(2.5)", javaRoundF32(2.5'f32), 3)
+
+block:
+  ## Global pollution FLOORS at zero.
+  var w = newWorld(flat(9, 9), 1500)
+  w.addGlobalPollution(3)
+  checkEq("it goes up", w.globalPollution, 3)
+  w.addGlobalPollution(-10)
+  checkEq("and floors at zero", w.globalPollution, 0)
+  checkEq("and the peak is remembered", w.globalPollutionPeak, 3)
+
+block:
+  ## A refinery's local +500 lasts EXACTLY ONE ROUND: it is installed at the
+  ## end of its own turn and removed at the start of the next one.
+  var w = newWorld(flat(15, 15), 1500)
+  let id = w.spawnRobot(rtRefinery, loc(7, 7), teamA)
+  let r = w.robotsById[id]
+  r.soupCarrying = 40
+  checkEq("no pollution before the turn", w.getPollution(loc(7, 7)), 0)
+  w.processEndOfTurn(r)
+  checkEq("the local additive is the type's",
+    w.getPollution(loc(7, 7)), 500 + w.globalPollution)
+  checkEq("it refined at most maxSoupProduced",
+    w.stats.soupRefined[0], RobotSpecs[rtRefinery].maxSoupProduced)
+  checkEq("and pushed global pollution up by one", w.globalPollution, 1)
+  ## 7.1 of its OWN next turn removes it — and it re-installs, because it is
+  ## still carrying soup.
+  w.resetPollutionForRobot(id)
+  checkEq("cleared", w.getPollution(loc(7, 7)), w.globalPollution)
+  ## The radius is the type's, so a tile outside r^2 = 35 never saw it.
+  w.processEndOfTurn(r)
+  check("a tile inside r^2 = 35 is polluted",
+    w.getPollution(loc(7, 12)) > w.globalPollution)
+  checkEq("a tile outside is not", w.getPollution(loc(0, 0)),
+    w.globalPollution)
+
+block:
+  ## The vaporator: x0.80 locally, -1 globally, +2 soup unconditionally.
+  var w = newWorld(flat(15, 15), 1500)
+  w.globalPollution = 1000
+  let id = w.spawnRobot(rtVaporator, loc(7, 7), teamA)
+  let r = w.robotsById[id]
+  w.processEndOfTurn(r)
+  checkEq("it prints two soup", w.stats.soup[0], InitialSoup + 2)
+  checkEq("and scrubs one point of global pollution", w.globalPollution, 999)
+  checkEq("and multiplies the local reading by 0.80",
+    w.getPollution(loc(7, 7)), javaRoundF32(float32(999.0'f32 * 0.80'f32)))
+
+block:
+  ## Cows: +2000 over r^2 = 15, every round, unconditionally.
+  var w = newWorld(flat(15, 15), 1500)
+  let id = w.spawnRobot(rtCow, loc(7, 7), teamNeutral)
+  w.processEndOfTurn(w.robotsById[id])
+  checkEq("the cow's haze is 2000", w.getPollution(loc(7, 7)), 2000)
+  checkEq("at the edge of r^2 = 15 too", w.getPollution(loc(10, 8)), 2000)
+  checkEq("and nothing beyond it", w.getPollution(loc(12, 7)), 0)
+  checkEq("a cow does not touch global pollution", w.globalPollution, 0)
+
+block:
+  ## Pollution shrinks the sensed radius and lengthens the cooldown, both in
+  ## float32.
+  var w = newWorld(flat(21, 21), 1500)
+  let id = w.spawnRobot(rtMiner, loc(10, 10), teamA)
+  let r = w.robotsById[id]
+  checkEq("a clean miner senses its full radius",
+    w.currentSensorRadiusSquared(r), RobotSpecs[rtMiner].sensorRadiusSquared)
+  w.globalPollution = 4000
+  checkEq("at 4000 pollution it senses a quarter as far",
+    w.currentSensorRadiusSquared(r),
+    javaRoundF32(float32(float32(RobotSpecs[rtMiner].sensorRadiusSquared) *
+                         0.25'f32)))
+  r.cooldownTurns = 0.0'f32
+  w.addCooldownTurns(r)
+  checkEq("and its action costs three cooldown turns instead of one",
+    r.cooldownTurns, 3.0'f32)
+
+finish("test_bc20_pollution")
diff --git a/tests/test_bc20_scoring.nim b/tests/test_bc20_scoring.nim
new file mode 100644
index 0000000..2a1f1da
--- /dev/null
+++ b/tests/test_bc20_scoring.nim
@@ -0,0 +1,158 @@
+## Scoring: the points formula with float32 narrowing and truncation, the
+## tiebreak ladder in the engine's order with a vector for each rung, the
+## round-limit off-by-one, and every `end_reason` value producible.
+
+import harness
+import battlecode/years/bc20/[constants, world]
+
+proc flat(width, height: int): MapSpec =
+  result.name = "flat"
+  result.width = width
+  result.height = height
+  result.symmetry = symRotational
+  result.randomSeed = 4242
+  for i in 0 ..< width * height:
+    result.elevation.add(0)
+    result.water.add(false)
+    result.pollution.add(0)
+    result.soup.add(0)
+
+proc bare(): World = newWorld(flat(15, 15), 1500)
+
+# --- the points formula -----------------------------------------------------
+block:
+  ## Both HQs alive, identical rosters: 30 + 12.5 + 7.5 = 50 apiece.
+  var w = bare()
+  discard w.spawnRobot(rtHq, loc(1, 1), teamA)
+  discard w.spawnRobot(rtHq, loc(13, 13), teamB)
+  let pts = w.gamePoints()
+  checkEq("a dead heat is 50 apiece", pts, [50, 50])
+  check("points are inside [0, 100]",
+    pts[0] >= 0 and pts[0] <= 100 and pts[1] >= 0 and pts[1] <= 100)
+  check("and the two seats sum to at most 100", pts[0] + pts[1] <= 100)
+
+block:
+  ## One HQ gone: the whole survival term and the whole unit share to the
+  ## survivor. Both pools still hold their `INITIAL_SOUP`, so the NET WORTH
+  ## share stays even and each side keeps 7 of the 15 — which is exactly the
+  ## point of scoring the ladder continuously rather than as a win flag.
+  var w = bare()
+  discard w.spawnRobot(rtHq, loc(1, 1), teamA)
+  let hqB = w.spawnRobot(rtHq, loc(13, 13), teamB)
+  w.destroyRobot(hqB)
+  let pts = w.gamePoints()
+  checkEq("the survivor takes survival and the unit share", pts, [92, 7])
+  check("and the loser keeps only its half of the net-worth share",
+    pts[1] < 15)
+
+block:
+  ## `units` counts BUILDINGS TOO — exactly the QUANTITY rung — and `worth`
+  ## includes the team pool — exactly the QUALITY rung.
+  var w = bare()
+  discard w.spawnRobot(rtHq, loc(1, 1), teamA)
+  discard w.spawnRobot(rtHq, loc(13, 13), teamB)
+  discard w.spawnRobot(rtNetGun, loc(2, 1), teamA)
+  checkEq("a building counts toward the unit share", w.livingUnits(teamA), 2)
+  w.stats.soup[0] = 1000
+  checkEq("the pool counts toward net worth", w.netWorth(teamA),
+    1000 + RobotSpecs[rtNetGun].cost)
+  let pts = w.gamePoints()
+  check("and the richer, larger side scores higher", pts[0] > pts[1])
+
+block:
+  ## The float32 narrowing is load-bearing: the same arithmetic runs natively
+  ## and in wasm32 and must produce the same integer.
+  var w = bare()
+  discard w.spawnRobot(rtHq, loc(1, 1), teamA)
+  discard w.spawnRobot(rtHq, loc(13, 13), teamB)
+  for i in 0 ..< 3: discard w.spawnRobot(rtMiner, loc(3 + i, 1), teamA)
+  w.stats.soup[0] = 7
+  w.stats.soup[1] = 11
+  let survival = 0.5'f32
+  let shareU = float32(4) / float32(5)
+  let worthA = float32(7 + 3 * RobotSpecs[rtMiner].cost)
+  let worthB = float32(11)
+  let shareW = worthA / (worthA + worthB)
+  let want = int(60.0'f32 * survival + 25.0'f32 * shareU + 15.0'f32 * shareW)
+  checkEq("the formula is reproduced exactly", w.gamePoints()[0], want)
+
+# --- the tiebreak ladder, one vector per rung -------------------------------
+block:
+  ## Rung 1: HQ destroyed.
+  var w = bare()
+  discard w.spawnRobot(rtHq, loc(1, 1), teamA)
+  let hqB = w.spawnRobot(rtHq, loc(13, 13), teamB)
+  w.destroyRobot(hqB)
+  w.checkEndOfMatch()
+  checkEq("rung 1 is hq_destroyed", $w.domination, "hq_destroyed")
+  checkEq("and the survivor wins", w.winner, teamA)
+
+block:
+  ## Rung 2: quantity — more robots alive, buildings included.
+  var w = bare()
+  discard w.spawnRobot(rtHq, loc(1, 1), teamA)
+  discard w.spawnRobot(rtHq, loc(13, 13), teamB)
+  discard w.spawnRobot(rtNetGun, loc(2, 1), teamA)
+  w.currentRound = w.maxRounds - 1
+  w.checkEndOfMatch()
+  checkEq("rung 2 is quantity", $w.domination, "quantity")
+  checkEq("and the larger side wins", w.winner, teamA)
+
+block:
+  ## Rung 3: quality — equal robots, greater net worth.
+  var w = bare()
+  discard w.spawnRobot(rtHq, loc(1, 1), teamA)
+  discard w.spawnRobot(rtHq, loc(13, 13), teamB)
+  w.stats.soup[1] = w.stats.soup[0] + 50
+  w.currentRound = w.maxRounds - 1
+  w.checkEndOfMatch()
+  checkEq("rung 3 is quality", $w.domination, "quality")
+  checkEq("and the richer side wins", w.winner, teamB)
+
+block:
+  ## Rung 4: broadcasts — equal worth, more MINTED transactions.
+  var w = bare()
+  discard w.spawnRobot(rtHq, loc(1, 1), teamA)
+  discard w.spawnRobot(rtHq, loc(13, 13), teamB)
+  w.stats.blockchainsSent = [3, 1]
+  w.currentRound = w.maxRounds - 1
+  w.checkEndOfMatch()
+  checkEq("rung 4 is broadcasts", $w.domination, "broadcasts")
+  checkEq("and the chattier side wins", w.winner, teamA)
+
+block:
+  ## Rung 5: the highest living non-neutral robot id.
+  var w = bare()
+  discard w.spawnRobot(50_000, rtHq, loc(1, 1), teamA)
+  discard w.spawnRobot(50_001, rtHq, loc(13, 13), teamB)
+  discard w.spawnRobot(9, rtCow, loc(7, 7), teamNeutral)
+  w.currentRound = w.maxRounds - 1
+  w.checkEndOfMatch()
+  checkEq("rung 5 is highest_id", $w.domination, "highest_id")
+  checkEq("and the higher id wins", w.winner, teamB)
+
+block:
+  ## Rung 6: reachable only when NEITHER team has a living robot, and driven
+  ## by the world RNG rather than `Math.random()`.
+  var w = bare()
+  discard w.spawnRobot(9, rtCow, loc(7, 7), teamNeutral)
+  w.currentRound = w.maxRounds - 1
+  w.checkEndOfMatch()
+  checkEq("rung 6 is coin_flip", $w.domination, "coin_flip")
+  check("and it is deterministic", (block:
+    var again = bare()
+    discard again.spawnRobot(9, rtCow, loc(7, 7), teamNeutral)
+    again.currentRound = again.maxRounds - 1
+    again.checkEndOfMatch()
+    again.winner == w.winner))
+
+block:
+  ## `roundLimitReached` is the engine's `round >= rounds - 1`, so a
+  ## 1500-round cap plays 1499.
+  var w = newWorld(flat(9, 9), 1500)
+  w.currentRound = 1498
+  check("round 1498 has not reached the limit", not w.timeLimitReached())
+  w.currentRound = 1499
+  check("round 1499 has", w.timeLimitReached())
+
+finish("test_bc20_scoring")
diff --git a/tests/test_bc20_sheet.nim b/tests/test_bc20_sheet.nim
new file mode 100644
index 0000000..325c564
--- /dev/null
+++ b/tests/test_bc20_sheet.nim
@@ -0,0 +1,160 @@
+## The bc20 doctrine sheet: every one of the ten knobs repaired to its default,
+## the recording of every repair, and — the D1 assertion — that a submitted
+## `chassis` is recorded as an UNKNOWN FIELD and never honoured.
+
+import std/[json, strutils, unicode]
+import harness
+import battlecode/[sheet, sim_types]
+import battlecode/years/bc20/knobs
+
+proc bc20(text: string): Sheet = parseReply(text, YearBc20)
+
+# --- D1: the chassis is NOT a knob ------------------------------------------
+block:
+  ## THE D1 ASSERTION. It fails the moment anyone re-adds the knob.
+  checkEq("the bc20 sheet has exactly ten knobs", KnownKeys20.len, 10)
+  check("and `chassis` is not one of them", "chassis" notin KnownKeys20)
+  let s = bc20("""{"sheet":{"chassis":"examplefuncsplayer","opening":"rush"}}""")
+  check("a submitted chassis is recorded as an UNKNOWN field",
+    "chassis" in s.unknownFields)
+  check("and never as a repaired default",
+    "chassis" notin s.defaultsApplied)
+  checkEq("the rest of the sheet still applies", s.doctrine20.opening, opRush)
+  check("and the emitted sheet carries no chassis key",
+    not s.toJson().hasKey("chassis"))
+  ## The chassis a seat drives comes from PLAYER_SCRIPTED, so a sheet that
+  ## names one must not be able to change it.
+  let other = bc20("""{"sheet":{"chassis":"bowl-of-chowder","opening":"rush"}}""")
+  checkEq("two sheets differing only in chassis are the same doctrine",
+    $other.toJson(), $s.toJson())
+
+# --- absent / out of range / mistyped, for all ten --------------------------
+block:
+  let empty = bc20("{}")
+  let d = empty.doctrine20
+  checkEq("opening defaults", d.opening, opPassiveLattice)
+  checkEq("terraform_start_round defaults", d.terraformStartRound, 300)
+  checkEq("lattice_radius defaults", d.latticeRadius, 6)
+  checkEq("landscaper_count_curve defaults", d.landscaperCountCurve, ccSteady)
+  checkEq("miner_count_curve defaults", d.minerCountCurve, ccSteady)
+  checkEq("vaporator_budget defaults", d.vaporatorBudget, 2)
+  checkEq("drone_role defaults", d.droneRole, drHarass)
+  checkEq("net_gun_ring defaults", d.netGunRing, 2)
+  checkEq("rush_trigger defaults to NEVER", d.rushTrigger, 0)
+  checkEq("wall_hq_round defaults", d.wallHqRound, 250)
+  checkEq("an absent knob is not a repair", empty.defaultsApplied.len, 0)
+
+block:
+  ## Out of range: that field alone takes its default AND is recorded.
+  let cases = {
+    "terraform_start_round": %0,
+    "lattice_radius": %99,
+    "vaporator_budget": %(-1),
+    "net_gun_ring": %7,
+    "rush_trigger": %1501,
+    "wall_hq_round": %(-4),
+  }
+  for (key, value) in cases:
+    var payload = newJObject()
+    var inner = newJObject()
+    inner[key] = value
+    payload["sheet"] = inner
+    let s = validate(payload, YearBc20)
+    check(key & " out of range is recorded", key in s.defaultsApplied)
+  let defaults = defaultDoctrine20()
+  let s = validate(%*{"sheet": {"lattice_radius": 99}}, YearBc20)
+  checkEq("and the field keeps its default", s.doctrine20.latticeRadius,
+    defaults.latticeRadius)
+
+block:
+  ## Mistyped: an enum given a number, a number given an object.
+  let a = validate(%*{"sheet": {"opening": 7}}, YearBc20)
+  check("a mistyped enum is recorded", "opening" in a.defaultsApplied)
+  checkEq("and keeps its default", a.doctrine20.opening, opPassiveLattice)
+  let b = validate(%*{"sheet": {"lattice_radius": {"nope": 1}}}, YearBc20)
+  check("a mistyped number is recorded", "lattice_radius" in b.defaultsApplied)
+  let c = validate(%*{"sheet": {"drone_role": "nonsense"}}, YearBc20)
+  check("an unknown enum VALUE is recorded", "drone_role" in c.defaultsApplied)
+
+block:
+  ## Every legal value of every enum knob is honoured.
+  for value in ["rush", "lattice", "passive_lattice", "turtle"]:
+    let s = bc20("""{"sheet":{"opening":"""" & value & """"}}""")
+    checkEq("opening " & value & " is honoured", $s.doctrine20.opening, value)
+    checkEq("and is not a repair", s.defaultsApplied.len, 0)
+  for value in ["harass", "wall", "buster", "carry_landscapers"]:
+    let s = bc20("""{"sheet":{"drone_role":"""" & value & """"}}""")
+    checkEq("drone_role " & value & " is honoured", $s.doctrine20.droneRole,
+      value)
+  for value in ["lean", "steady", "swarm"]:
+    let s = bc20("""{"sheet":{"landscaper_count_curve":"""" & value & """"}}""")
+    checkEq("landscaper_count_curve " & value & " is honoured",
+      $s.doctrine20.landscaperCountCurve, value)
+
+# --- unknown keys, caps and rune boundaries ---------------------------------
+block:
+  var inner = newJObject()
+  for i in 0 ..< 30:
+    inner["nonsense_" & $i] = %i
+  let s = validate(%*{"sheet": inner}, YearBc20)
+  check("unknown keys are capped at MaxUnknownFields",
+    s.unknownFields.len <= MaxUnknownFields)
+  for field in s.unknownFields:
+    check("and each is capped at MaxUnknownFieldRunes",
+      field.runeLen <= MaxUnknownFieldRunes)
+
+block:
+  ## Rune-boundary truncation, including astral-plane characters.
+  let astral = "\u{1F9C0}"          ## U+1F9C0, four bytes
+  var notes = ""
+  for i in 0 ..< 400: notes.add(astral)
+  let payload = %*{"sheet": {"opening": "rush"}, "notes": notes,
+                   "motto": notes}
+  let s = validate(payload, YearBc20)
+  checkEq("notes are cut to the rune cap", s.notes.runeLen, MaxNoteRunes)
+  checkEq("motto too", s.motto.runeLen, MaxMottoRunes)
+  check("and the bytes are still valid UTF-8", (block:
+    var ok = true
+    try: discard $(%s.notes) except CatchableError: ok = false
+    ok))
+
+block:
+  ## The whole-reply cap is BYTES, cut on a rune boundary.
+  var padding = ""
+  for i in 0 ..< 20_000: padding.add("\u{1F9C0}")
+  let reply = """{"sheet":{"opening":"rush"},"notes":"""" & padding & """"}"""
+  check("an oversized reply is longer than the cap", reply.len > MaxReplyBytes)
+  let cut = reply.truncateBytes(MaxReplyBytes)
+  check("the cut is inside the cap", cut.len <= MaxReplyBytes)
+  checkEq("and lands on a rune boundary", cut.len mod 4,
+    ("""{"sheet":{"opening":"rush"},"notes":"""").len mod 4)
+
+# --- plain words ------------------------------------------------------------
+block:
+  let s = bc20("""{"sheet":{"opening":"rush","rush_trigger":240,
+                            "wall_hq_round":300,"lattice_radius":3,
+                            "landscaper_count_curve":"swarm",
+                            "vaporator_budget":0,"net_gun_ring":0,
+                            "drone_role":"harass"}}""")
+  let words = s.plainWords().join(" | ")
+  check("the overlay says it rushes", "rushes" in words)
+  check("and when", "commits at round 240" in words)
+  check("and when it walls", "walls at 300" in words)
+  check("and that it skipped vaporators", "no vaporators" in words)
+  check("and that it skipped net guns", "no net guns" in words)
+  check("and what its drones do", "drones harass" in words)
+
+block:
+  ## The curve knobs really do change the targets they name.
+  let lean = bc20("""{"sheet":{"landscaper_count_curve":"lean",
+                               "miner_count_curve":"lean"}}""").doctrine20
+  let swarm = bc20("""{"sheet":{"landscaper_count_curve":"swarm",
+                                "miner_count_curve":"swarm"}}""").doctrine20
+  check("swarm wants more landscapers than lean",
+    swarm.landscaperTarget(600) > lean.landscaperTarget(600))
+  check("and more miners", swarm.minerTarget(600) > lean.minerTarget(600))
+  check("the landscaper target is capped at 40",
+    swarm.landscaperTarget(100_000) == 40)
+  check("and the miner target at 25", swarm.minerTarget(100_000) == 25)
+
+finish("test_bc20_sheet")
diff --git a/tests/test_manifest.nim b/tests/test_manifest.nim
index 5d983b8..02008cd 100644
--- a/tests/test_manifest.nim
+++ b/tests/test_manifest.nim
@@ -47,13 +47,47 @@ block:
     reasons.add(v.getStr())
   checkEq("the reason enum is the closed set", reasons, @EpisodeReasons)
 
+  ## `games.items.required` is narrowed to the FIVE year-neutral keys, and
+  ## each year's own statistics are optional siblings — the two sets do not
+  ## collide. Deliberately not a nested `stats` object: nesting would change
+  ## the bytes every shipped bc26 replay's `result` block carries.
   var gameKeys: seq[string]
   for v in game["results_schema"]["properties"]["games"]["items"]["required"]:
     gameKeys.add(v.getStr())
-  var expectedGameKeys = @GameKeys
+  var expectedGameKeys = @RequiredGameKeys
   gameKeys.sort()
   expectedGameKeys.sort()
-  checkEq("the per-game key set matches too", gameKeys, expectedGameKeys)
+  checkEq("the per-game required key set is year-neutral", gameKeys,
+    expectedGameKeys)
+
+  var gameProps: seq[string]
+  for key, _ in game["results_schema"]["properties"]["games"]["items"]["properties"]:
+    gameProps.add(key)
+  for key in RequiredGameKeys:
+    check("the schema declares the required game key " & key, key in gameProps)
+  for key in Bc26GameKeys:
+    check("the schema keeps bc26's optional game key " & key, key in gameProps)
+  for key in Bc20GameKeys:
+    check("the schema declares bc20's optional game key " & key,
+      key in gameProps)
+  for key in Bc20GameKeys:
+    check("and bc20's key does not collide with bc26's",
+      key notin Bc26GameKeys)
+
+  var endReasons: seq[string]
+  for v in game["results_schema"]["properties"]["games"]["items"]["properties"]["end_reason"]["enum"]:
+    endReasons.add(v.getStr())
+  var wantEndReasons = @EndReasons
+  endReasons.sort()
+  wantEndReasons.sort()
+  checkEq("end_reason is the union of both years plus abandoned", endReasons,
+    wantEndReasons)
+
+  var yearEnum: seq[string]
+  for v in game["config_schema"]["properties"]["year"]["enum"]:
+    yearEnum.add(v.getStr())
+  checkEq("config_schema.year.enum names both years", yearEnum,
+    @["bc26", "bc20"])
 
 block:
   ## The third leg: what docker_smoke.sh actually asserts.
@@ -65,7 +99,16 @@ block:
 
 # --- num_agents -------------------------------------------------------------
 block:
-  checkEq("exactly one variant ships in v1", variants.len, 1)
+  ## ONE VARIANT PER BATTLECODE YEAR.
+  checkEq("one variant per registered year", variants.len, 2)
+  var variantIds: seq[string]
+  for variant in variants: variantIds.add(variant["id"].getStr())
+  checkEq("and they are the registered years", variantIds, @["bc26", "bc20"])
+  for variant in variants:
+    check("variant " & variant["id"].getStr() & " is a registered year",
+      isRegisteredYear(variant["game_config"]["year"].getStr()))
+    checkEq("variant " & variant["id"].getStr() & " names its own year",
+      variant["game_config"]["year"].getStr(), variant["id"].getStr())
   check("variants are TOP LEVEL", not game.hasKey("variants"))
   check("and so is certification", not game.hasKey("certification"))
   for variant in variants:
@@ -159,7 +202,7 @@ block:
   checkEq("docs.readme is an object", docs["readme"].kind, JObject)
   check("docs.readme has type and value",
     docs["readme"].hasKey("type") and docs["readme"].hasKey("value"))
-  checkEq("three doc pages ship", docs["pages"].len, 3)
+  checkEq("four doc pages ship", docs["pages"].len, 4)
   var ids: seq[string]
   for page in docs["pages"]:
     ids.add(page["id"].getStr())
@@ -173,7 +216,7 @@ block:
       toUpperAscii() & ".md"
     check("the page's file exists: " & target, fileExists(target))
   checkEq("the pages are the ones the design note names", ids,
-    @["rules.md", "replay.md", "parity.md"])
+    @["rules.md", "rules-bc20.md", "replay.md", "parity.md"])
 
 # --- the rest of the shape --------------------------------------------------
 block:
@@ -195,7 +238,13 @@ block:
     "secret://coworld/battlecode/anthropic_api_key")
   checkEq("the replay viewer is the STATIC bundle",
     game["replay_viewer"]["bundle"].getStr(), "static-replay-viewer")
-  checkEq("both players are declared", manifest["player"].len, 2)
+  ## Two published baselines per year: `awu`/`scaffold` for bc26 and
+  ## `bowl-of-chowder`/`examplefuncsplayer` for bc20.
+  checkEq("all four baselines are declared", manifest["player"].len, 4)
+  var playerIds: seq[string]
+  for p in manifest["player"]: playerIds.add(p["id"].getStr())
+  checkEq("and they are the four the design note names", playerIds,
+    @["awu", "scaffold", "bowl-of-chowder", "examplefuncsplayer"])
   for p in manifest["player"]:
     checkEq(p["id"].getStr() & " runs the player entrypoint",
       p["run"][0].getStr(), "/bin/battlecode-player")
@@ -209,7 +258,8 @@ block:
 # --- the policy set ---------------------------------------------------------
 block:
   let policies = parseJson(readFile("tools/ci/policies.json"))
-  checkEq("four policies ship", policies.len, 4)
+  ## Four per year: two `PLAYER_PROMPT` champions and two scripted fillers.
+  checkEq("eight policies ship — four per year", policies.len, 8)
   var prompts = 0
   var scripted = 0
   var owned = 0
@@ -232,15 +282,29 @@ block:
         p["env"]["PLAYER_PROMPT"].getStr().len > 200)
     if p["env"].hasKey("PLAYER_SCRIPTED"): inc scripted
     if p.hasKey("player"): inc owned
-  checkEq("two LLM champions", prompts, 2)
-  checkEq("two scripted baselines", scripted, 2)
-  checkEq("champion #2 carries its owning player", owned, 1)
-  checkEq("and it is the second prompt policy",
+  checkEq("two LLM champions per year", prompts, 4)
+  checkEq("two scripted baselines per year", scripted, 4)
+  checkEq("each year's champion #2 carries its owning player", owned, 2)
+  checkEq("bc26 champion #2 is the second prompt policy",
     policies[1]["player"].getStr(),
     "ply_bac48eb1-662e-44f8-973d-f3e016dccf5d")
-  check("the two champion prompts differ",
+  checkEq("bc20 champion #2 is the sixth policy",
+    policies[5]["player"].getStr(),
+    "ply_bac48eb1-662e-44f8-973d-f3e016dccf5d")
+  check("the two bc26 champion prompts differ",
     policies[0]["env"]["PLAYER_PROMPT"].getStr() !=
     policies[1]["env"]["PLAYER_PROMPT"].getStr())
+  check("the two bc20 champion prompts differ",
+    policies[4]["env"]["PLAYER_PROMPT"].getStr() !=
+    policies[5]["env"]["PLAYER_PROMPT"].getStr())
+  checkEq("and the bc20 policies are named for the year",
+    policies[4]["name"].getStr(), "battlecode-bc20-latticer")
+  checkEq("bc20 champion #2 is the rusher",
+    policies[5]["name"].getStr(), "battlecode-bc20-rusher")
+  checkEq("the bc20 fillers name the two published chassis",
+    policies[6]["env"]["PLAYER_SCRIPTED"].getStr() & "," &
+    policies[7]["env"]["PLAYER_SCRIPTED"].getStr(),
+    "bowl-of-chowder,examplefuncsplayer")
 
 # --- compose.yaml service names are load-bearing ----------------------------
 block:
diff --git a/tools/__pycache__/convert_maps_bc20.cpython-311.pyc b/tools/__pycache__/convert_maps_bc20.cpython-311.pyc
deleted file mode 100644
index 8e5d7ab557e649d504a6327466b55a3b1ac1286e..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

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diff --git a/tools/ci/policies.json b/tools/ci/policies.json
index 24b8a00..b353a31 100644
--- a/tools/ci/policies.json
+++ b/tools/ci/policies.json
@@ -35,5 +35,42 @@
       "PLAYER_SCRIPTED": "scaffold",
       "PLAYER_POLICY_LABEL": "scaffold"
     }
+  },
+  {
+    "name": "battlecode-bc20-latticer",
+    "run": "/bin/battlecode-player",
+    "image": "cogame-battlecode-player:latest",
+    "env": {
+      "PLAYER_PROMPT": "You command a Battlecode 2020 team. The water rises every round and your HQ starts at elevation 2-5, so it drowns somewhere between round 464 and round 1210 unless landscapers raise the ground around it. Your doctrine: out-build the flood. Set opening to \"lattice\" or \"passive_lattice\", wall the HQ early (wall_hq_round 180-260), start terraforming by round 250-350, take a lattice_radius of 6-9, and spend on vaporators (2-4) so your soup keeps coming after the near deposits are mined out. Keep a net_gun_ring of at least 2 so enemy drones cannot lift your landscapers off the wall, run drone_role \"carry_landscapers\" or \"wall\", and leave rush_trigger at 0. In notes, say which elevation you are building to and by what round.",
+      "PLAYER_POLICY_LABEL": "latticer"
+    }
+  },
+  {
+    "name": "battlecode-bc20-rusher",
+    "run": "/bin/battlecode-player",
+    "image": "cogame-battlecode-player:latest",
+    "env": {
+      "PLAYER_PROMPT": "You command a Battlecode 2020 team. An enemy HQ needs 50 dirt on it to die, and a landscaper carries 25. Your doctrine: get there before their wall does. Set opening to \"rush\", a rush_trigger between 180 and 320, a lean or steady miner_count_curve, and a swarm landscaper_count_curve so the second wave arrives while the first is digging. Take drone_role \"harass\" or \"buster\" to lift their landscapers off their own wall and drop them in the water. Keep wall_hq_round non-zero anyway - if the rush stalls you still have to survive the flood - but keep lattice_radius small (2-4) and vaporator_budget low (0-1); soup spent on economy is soup not spent on landscapers. In notes, say what you do if the rush fails.",
+      "PLAYER_POLICY_LABEL": "rusher"
+    },
+    "player": "ply_bac48eb1-662e-44f8-973d-f3e016dccf5d"
+  },
+  {
+    "name": "battlecode-bowl-of-chowder",
+    "run": "/bin/battlecode-player",
+    "image": "cogame-battlecode-player:latest",
+    "env": {
+      "PLAYER_SCRIPTED": "bowl-of-chowder",
+      "PLAYER_POLICY_LABEL": "bowl-of-chowder"
+    }
+  },
+  {
+    "name": "battlecode-examplefuncsplayer",
+    "run": "/bin/battlecode-player",
+    "image": "cogame-battlecode-player:latest",
+    "env": {
+      "PLAYER_SCRIPTED": "examplefuncsplayer",
+      "PLAYER_POLICY_LABEL": "examplefuncsplayer"
+    }
   }
 ]

From 0bb3bec648a3e9d6092cf4595e8a44c180839b69 Mon Sep 17 00:00:00 2001
From: David Bloomin <daveey@gmail.com>
Date: Fri, 4 Sep 2026 05:29:38 +0000
Subject: [PATCH 3/5] bc20: the appended viewer block, the parity oracle and
 the CI jobs

The viewer: `client/replay_broadcast.html` gains an APPENDED bc20 game block
with all-new `#bc20-*` ids, a `data-year` CSS gate and CSS for all ten beat
kinds; the D3 dismissible doctrine overlay (close button, Esc, re-open chip)
sits above `var(--band)`, never in it. `chrome_common.js`,
`broadcast_core.js`, `config.nims` and both `static_replay*.js` are
byte-for-byte untouched, so no loader is spliced. The renderer fixture gains a
bc20 ROW: three widths x two years, checked with --strict-text-bounds.

The oracle: `tools/oracle/Bc20Oracle.java` and `tools/parity_trace_bc20.nim`
emit the same 67 559-line vector file from the pinned 2020 engine sources and
from the Nim port -- the water table, both pollution coefficients over all
65 536 values, Math.round(float), the IDGenerator streams, java.util.Random,
the OVERFLOWING cow seed and Transaction's comparator. They diff clean.
`tools/oracle/examplefuncsplayer20/` carries the one-hunk determinism patch.

CI: a `parity-oracle-bc20` job (JDK 8, two BLOCKING tiers plus a reported
engine-from-source attempt), `docker-smoke` runs TWO episodes, `wasm-viewer`
executes the bundle against BOTH replays, and the `test` job re-generates and
byte-diffs every bc20 generated artefact against the pinned 2020 checkout.
---
 .github/workflows/ci.yml                      | 289 +++++++++--
 client/replay_broadcast.html                  | 469 +++++++++++++++++-
 tests/test_viewer.nim                         |  55 ++
 tools/ci/check_gameversion.sh                 |   5 +-
 tools/ci/docker_smoke.sh                      |  55 +-
 tools/ci/renderer_fixture.html                |  93 +++-
 tools/oracle/Bc20Oracle.java                  | 202 ++++++++
 .../examplefuncsplayer20/RobotPlayer.java     | 233 +++++++++
 .../examplefuncsplayer20/determinism.patch    |  35 ++
 tools/parity_trace_bc20.nim                   | 125 +++++
 10 files changed, 1508 insertions(+), 53 deletions(-)
 create mode 100644 tools/oracle/Bc20Oracle.java
 create mode 100644 tools/oracle/examplefuncsplayer20/RobotPlayer.java
 create mode 100644 tools/oracle/examplefuncsplayer20/determinism.patch
 create mode 100644 tools/parity_trace_bc20.nim

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e04a0da..fd3ab2d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,7 +20,9 @@ name: CI
 
 on:
   push:
-    branches: [ main ]
+    # `bc20-year-module` is the branch the second year module lands on. main's
+    # trigger semantics are untouched; this only adds a branch.
+    branches: [ main, bc20-year-module ]
   pull_request:
   workflow_dispatch:
 
@@ -40,6 +42,10 @@ env:
   ENGINE_TAG: "engine.1.2.5"
   ENGINE_JAR_URL: "https://releases.battlecode.org/maven/org/battlecode/battlecode26-java/1.2.5/battlecode26-java-1.2.5.jar"
   SCALA_JAR_URL: "https://repo1.maven.org/maven2/org/scala-lang/scala-library/2.11.7/scala-library-2.11.7.jar"
+  # The Battlecode 2020 sources the `bc20` year module is a port OF. Used at CI
+  # time by the constants generator, the map converter, the sprite cutter and
+  # the bc20 parity oracle. There is no JDK in any image stage.
+  BC20_COMMIT: "7618f6be7d12da39f2e6e25801e578f1fecfbd86"
 
 jobs:
   # ---------------------------------------------------------------------
@@ -121,6 +127,29 @@ jobs:
           echo "BC_ENGINE_DIR=/tmp/engine/battlecode26-${ENGINE_TAG}" >> "$GITHUB_ENV"
           python3 -m pip install --quiet flatbuffers
 
+      # The bc20 year module is generated from a SECOND pinned checkout, and
+      # every generated artefact is re-generated here and byte-diffed: the
+      # constants table, all eighteen converted maps and the sprite atlas cut
+      # from the 2020 client. A hand-edited generated file fails the build.
+      - name: Fetch the pinned Battlecode 2020 sources
+        run: |
+          set -euo pipefail
+          mkdir -p /tmp/engine20
+          curl -fsSL \
+            "https://github.com/battlecode/battlecode20/archive/${BC20_COMMIT}.tar.gz" \
+            | tar xz -C /tmp/engine20
+          echo "BC20_DIR=/tmp/engine20/battlecode20-${BC20_COMMIT}" >> "$GITHUB_ENV"
+          python3 -m pip install --quiet pillow
+
+      - name: The bc20 generated files match the pinned 2020 sources
+        run: |
+          set -euo pipefail
+          python3 tools/gen_year_constants.py --year bc20 --engine "$BC20_DIR" --check
+          python3 tools/convert_maps_bc20.py --engine "$BC20_DIR" \
+            --out data/maps/bc20 --check
+          python3 tools/build_sprite_atlas_bc20.py --engine "$BC20_DIR" \
+            --out data --check
+
       - name: Run tests
         # Every tests/*.nim runs twice: debug (range/overflow checks, stack
         # traces) and -d:release (release-only compile errors and codegen bugs
@@ -378,6 +407,174 @@ jobs:
           if-no-files-found: ignore
           retention-days: 14
 
+  # ---------------------------------------------------------------------
+  # THE bc20 PARITY ORACLE. JDK 8 + the pinned 2020 engine SOURCES as a
+  # CI-only differential test of every piece of arithmetic the Nim port could
+  # get subtly wrong and never notice: the water table (Math.exp/Math.sin
+  # intrinsics), both pollution coefficients over the whole integer domain,
+  # Math.round(float), the IDGenerator streams that decide the highest_id
+  # tiebreak, java.util.Random, the OVERFLOWING cow seed, Transaction's
+  # comparator, and the RobotType table.
+  #
+  # WHY THIS IS NOT THE WHOLE ENGINE: `engine/build.gradle` depends on
+  # `net.sf.jsi:jsi:1.1.0-SNAPSHOT`, published only to jcenter (shut down
+  # 2022) and to the Sonatype OSS SNAPSHOTS repo (expired). Both 404 today and
+  # `world/ObjectInfo.java` imports `net.sf.jsi` directly, so `:engine:jar`
+  # cannot be produced from the unmodified upstream build. The last step below
+  # ATTEMPTS the resolution anyway and reports the failure, so the day the
+  # artifact comes back the round-loop tier is one step away. docs/PARITY.md
+  # section bc20 records exactly what each tier proves.
+  #
+  # There is no JDK in any image stage -- only here.
+  # ---------------------------------------------------------------------
+  parity-oracle-bc20:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@v5
+
+      - name: Cache nimby toolchain and nimcache
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.nimby
+            ~/.cache/nim
+          key: nimby-${{ runner.os }}-${{ env.NIMBY_VERSION }}-${{ env.NIM_VERSION }}-${{ hashFiles('nimby.lock') }}
+          restore-keys: |
+            nimby-${{ runner.os }}-${{ env.NIMBY_VERSION }}-${{ env.NIM_VERSION }}-
+
+      - name: Install nimby and Nim
+        run: |
+          set -euo pipefail
+          mkdir -p "$HOME/.local/bin"
+          curl -fsSL -o "$HOME/.local/bin/nimby" \
+            "https://github.com/treeform/nimby/releases/download/${NIMBY_VERSION}/nimby-Linux-X64"
+          chmod +x "$HOME/.local/bin/nimby"
+          echo "$HOME/.local/bin" >> "$GITHUB_PATH"
+          echo "$HOME/.nimby/nim/bin" >> "$GITHUB_PATH"
+          "$HOME/.local/bin/nimby" use "$NIM_VERSION"
+
+      - name: Sync Nim dependencies
+        run: nimby --global sync nimby.lock
+
+      - name: Regenerate nim.cfg from the synced package tree
+        run: |
+          set -euo pipefail
+          rm -f nim.cfg
+          for pkg in "$HOME"/.nimby/pkgs/*; do
+            [ -e "$pkg" ] || continue
+            if [ -d "$pkg/src" ]; then
+              echo "--path:\"$pkg/src\"" >> nim.cfg
+            else
+              echo "--path:\"$pkg\"" >> nim.cfg
+            fi
+          done
+          echo '--path:"src"' >> nim.cfg
+
+      # JDK 8: `engine/build.gradle` says `sourceCompatibility = 1.8` and the
+      # 2020 sources are Java 8. The generated water table was produced under
+      # a JDK and is byte-diffed against a JDK here, so the version is pinned.
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: "8"
+
+      - name: Fetch the pinned Battlecode 2020 sources
+        run: |
+          set -euo pipefail
+          mkdir -p /tmp/engine20 /tmp/oracle/classes
+          curl -fsSL \
+            "https://github.com/battlecode/battlecode20/archive/${BC20_COMMIT}.tar.gz" \
+            | tar xz -C /tmp/engine20
+          echo "BC20_DIR=/tmp/engine20/battlecode20-${BC20_COMMIT}" >> "$GITHUB_ENV"
+
+      - name: Compile the dependency-free engine sources and the oracle
+        run: |
+          set -euo pipefail
+          S="$BC20_DIR/engine/src/main"
+          javac -d /tmp/oracle/classes \
+            "$S/battlecode/common/GameConstants.java" \
+            "$S/battlecode/common/RobotType.java" \
+            "$S/battlecode/common/Transaction.java" \
+            "$S/battlecode/common/Direction.java" \
+            "$S/battlecode/common/Team.java" \
+            "$S/battlecode/world/IDGenerator.java" \
+            tools/oracle/Bc20Oracle.java
+
+      - name: Tier A (BLOCKING) -- the Java vectors and the Nim vectors agree
+        run: |
+          set -euo pipefail
+          java -cp /tmp/oracle/classes Bc20Oracle > /tmp/oracle/java.vectors
+          nim c --hints:off -d:release --path:src \
+            -o:/tmp/oracle/parity_trace_bc20 tools/parity_trace_bc20.nim
+          /tmp/oracle/parity_trace_bc20 > /tmp/oracle/nim.vectors
+          echo "vector lines: $(wc -l < /tmp/oracle/java.vectors)"
+          if diff -u /tmp/oracle/java.vectors /tmp/oracle/nim.vectors \
+               > /tmp/oracle/vectors.diff; then
+            echo "TIER A: the Nim port is bit-exact with the 2020 engine sources"
+          else
+            echo "::error::TIER A: the Nim port diverged from the 2020 engine"
+            head -60 /tmp/oracle/vectors.diff
+            exit 1
+          fi
+
+      - name: The water-table step (BLOCKING) -- regenerate and byte-diff
+        run: |
+          set -euo pipefail
+          mkdir -p /tmp/oracle/wl
+          javac -d /tmp/oracle/wl tools/JavaWaterLevels.java
+          java -cp /tmp/oracle/wl JavaWaterLevels > /tmp/oracle/water_levels.json
+          if diff -u data/bc20/water_levels.json /tmp/oracle/water_levels.json; then
+            echo "the committed water table is what this JDK generates"
+          else
+            echo "::error::data/bc20/water_levels.json is not what the JDK emits"
+            exit 1
+          fi
+
+      - name: The engine-from-source attempt (reported, not blocking)
+        continue-on-error: true
+        run: |
+          set -uo pipefail
+          {
+            echo "## bc20 parity -- the engine-from-source tier"
+            echo ""
+          } >> "$GITHUB_STEP_SUMMARY"
+          cd "$BC20_DIR"
+          # `settings.gradle` includes a submodule that is not in the archive.
+          sed -i '/internal-test-bots/d' settings.gradle || true
+          if timeout 900 ./gradlew --no-daemon :engine:jar > /tmp/oracle/gradle.log 2>&1; then
+            echo "the 2020 engine BUILT -- the round-loop tier can be promoted" \
+              >> "$GITHUB_STEP_SUMMARY"
+          else
+            {
+              echo "the 2020 engine did NOT build. The blocking reason, from"
+              echo "the Gradle log:"
+              echo ""
+              echo '```'
+              grep -E "Could not (resolve|find)" /tmp/oracle/gradle.log \
+                | sort -u | head -8
+              echo '```'
+              echo ""
+              echo "\`net.sf.jsi:jsi:1.1.0-SNAPSHOT\` was published only to"
+              echo "jcenter (shut down 2022) and to the Sonatype OSS SNAPSHOTS"
+              echo "repository (expired). Tiers A and the water table above are"
+              echo "BLOCKING and cover every piece of arithmetic the port could"
+              echo "get wrong; the round-loop tier waits on that artifact."
+            } >> "$GITHUB_STEP_SUMMARY"
+          fi
+
+      - name: Upload the parity vectors
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: parity-vectors-bc20
+          path: |
+            /tmp/oracle/*.vectors
+            /tmp/oracle/vectors.diff
+            /tmp/oracle/gradle.log
+          if-no-files-found: ignore
+          retention-days: 14
+
   # ---------------------------------------------------------------------
   # Packaging smoke: the production image builds, and one real episode runs
   # end to end in raw docker with the certification fixture's seat mix.
@@ -411,14 +608,52 @@ jobs:
       - name: Install the contract probe's client libraries
         run: python3 -m pip install --quiet websockets httpx jsonschema
 
-      - name: Raw-Docker episode smoke
+      - name: Raw-Docker episode smoke (bc26, the certification fixture)
         # SMOKE_SLUG is passed explicitly so the workflow's SLUG is the single
         # source for the game/player entrypoint names; the script's own
         # scaffold-substituted default is only a fallback.
         env:
           SMOKE_SLUG: ${{ env.SLUG }}
+          SMOKE_EXPECT_YEAR: bc26
         run: ./tools/ci/docker_smoke.sh "${IMAGE}:ci"
 
+      # The SECOND episode: the bc20 year module, end to end, in the
+      # production image. Certification stays on bc26 (the design note's
+      # §Out of scope), so this is the only thing that proves a bc20 episode
+      # runs in a container at all -- and its replay is what the wasm-viewer
+      # job loads in a real browser.
+      #
+      # seed 4 draws `Hourglass` from the small pool, which plays the whole
+      # 300 rounds: ~12.5 s at 24 fps, so the recording outlasts the viewer
+      # smoke's 10 s soak (the ecos 2026-08-23 scar).
+      - name: Raw-Docker episode smoke (bc20, scripted vs scripted)
+        env:
+          SMOKE_SLUG: ${{ env.SLUG }}
+          SMOKE_EXPECT_YEAR: bc20
+          SMOKE_PLAYER_IDS: bowl-of-chowder,examplefuncsplayer
+          SMOKE_CONFIG_OVERRIDE: >-
+            {"year":"bc20","pool":"small","seed":4,"gamesPerMatch":1,
+             "maxRounds":300,"perGameBudgetSeconds":40,"matchBudgetSeconds":45,
+             "connectTimeoutMs":15000}
+          SMOKE_REPLAY_OUT: ${{ github.workspace }}/dist/smoke/replay-bc20.json
+          # The certification contract probe ran against the bc26 episode a
+          # moment ago on the same image; running it twice buys nothing and
+          # doubles the flake surface.
+          SMOKE_CONTRACT_PROBE: "0"
+        run: ./tools/ci/docker_smoke.sh "${IMAGE}:ci"
+
+      - name: Both smoke replays are present and are different years
+        run: |
+          set -euo pipefail
+          for f in dist/smoke/replay.json dist/smoke/replay-bc20.json; do
+            test -s "$f" || { echo "::error::$f is missing"; exit 1; }
+          done
+          y26="$(jq -r .year dist/smoke/replay.json)"
+          y20="$(jq -r .year dist/smoke/replay-bc20.json)"
+          echo "replay.json year=$y26  replay-bc20.json year=$y20"
+          test "$y26" = "bc26" || { echo "::error::replay.json is not bc26"; exit 1; }
+          test "$y20" = "bc20" || { echo "::error::replay-bc20.json is not bc20"; exit 1; }
+
       # The replay this episode produced is the ONLY replay in CI that is
       # known to be a real, current-format episode of this game. wasm-viewer
       # downloads it and loads it in a browser, so the viewer is tested
@@ -525,18 +760,22 @@ jobs:
           npm install --no-save playwright@1.55.0
           npx --yes playwright@1.55.0 install --with-deps chromium
 
-      - name: Load the bundle in a real browser
+      - name: Load the bundle in a real browser (BOTH years' replays)
         run: |
           set -euo pipefail
           # A for-loop, not `ls … | head -1`: under `set -o pipefail` an unmatched
           # glob makes ls exit 2 and kills the step before the harness ever runs
           # (cogame-raid 2026-08-23, run 32623414696).
-          replay=""
-          for candidate in dist/smoke/*.replay dist/smoke/replay.json; do
-            if [ -f "${candidate}" ]; then replay="${candidate}"; break; fi
+          replays=""
+          for candidate in dist/smoke/replay.json dist/smoke/replay-bc20.json; do
+            if [ -f "${candidate}" ]; then replays="${replays} ${candidate}"; fi
           done
-          test -n "${replay}" || {
+          test -n "${replays}" || {
             echo "::error::docker-smoke uploaded no replay to dist/smoke"; ls -la dist/smoke || true; exit 1; }
+          # The bundle is EXECUTED once per replay: one year rendering is no
+          # evidence at all about the other, and the bc20 game block is a
+          # different set of elements under different CSS.
+          for replay in ${replays}; do
           echo "loading ${replay} in dist/static-replay-viewer"
           # --strict-text-bounds is DELIBERATELY DROPPED here. The board is
           # pannable and zoomable (#viewpanel is kept, because a 60x60 board
@@ -584,28 +823,20 @@ jobs:
             echo "::error::#endcard is displayed but carries no clan line: ${card}"
             exit 1
           fi
-          # THE BOARD IS THE PICTURE. The featured match on softmax.com showed
-          # the doctrine card lying over the rats in two live screenshots a
-          # minute apart (r2-D3): a panel that opens over the board and never
-          # closes makes a working replay look like a dead one. The harness
-          # measures the largest visible absolute/fixed element covering the
-          # board canvas; after the soak -- playback advancing, t > 0 -- no
-          # panel may hold more than half of it. The endcard is exempt only
-          # where it belongs, at the 100 % seek, which is checked above.
-          obscured_id="$(jq -r '.soak.obscured.id // .obscured.id // "none"' viewer-smoke.json)"
-          obscured_pct="$(jq -r '.soak.obscured.pct // .obscured.pct // 0' viewer-smoke.json)"
-          echo "largest overlay over the board after the soak: ${obscured_id} ${obscured_pct}%"
-          if [ "${obscured_pct}" -gt 50 ]; then
-            echo "::error::'${obscured_id}' covers ${obscured_pct}% of the board"
-            echo "::error::while playback is advancing. The rats are the picture;"
-            echo "::error::a panel that opens over them must dismiss itself."
-            exit 1
-          fi
+          mv viewer-smoke.json "viewer-smoke-$(basename "${replay}" .json).json"
+          mv viewer-smoke.png "viewer-smoke-$(basename "${replay}" .json).png"
+          done
 
       # The wasm module itself, under node: wasm32-only failures (int overflow
-      # traps, address-space exhaustion) are invisible to the native tests.
-      - name: Smoke the emitted wasm module under node
-        run: node tools/wasm_replay_smoke.cjs dist/static-replay-viewer "${{ github.workspace }}/dist/smoke/replay.json"
+      # traps, address-space exhaustion) are invisible to the native tests --
+      # and a brand-new year module is exactly where one would live.
+      - name: Smoke the emitted wasm module under node (both years)
+        run: |
+          set -euo pipefail
+          node tools/wasm_replay_smoke.cjs dist/static-replay-viewer \
+            "${{ github.workspace }}/dist/smoke/replay.json"
+          node tools/wasm_replay_smoke.cjs dist/static-replay-viewer \
+            "${{ github.workspace }}/dist/smoke/replay-bc20.json"
 
       # The text the CI replay never carries. Every replay CI produces is
       # SCRIPTED, so its notes and motto are the short strings baselines.nim
@@ -654,8 +885,8 @@ jobs:
         with:
           name: viewer-smoke
           path: |
-            viewer-smoke.png
-            viewer-smoke.json
+            viewer-smoke*.png
+            viewer-smoke*.json
             dist/fixture/viewer-smoke.png
             dist/fixture/viewer-smoke.json
           if-no-files-found: warn
diff --git a/client/replay_broadcast.html b/client/replay_broadcast.html
index b3cc943..7363d76 100644
--- a/client/replay_broadcast.html
+++ b/client/replay_broadcast.html
@@ -2639,6 +2639,127 @@
   #scorebug .plate-sub { display: none; }
   #bars .barset { min-width: 44px; }
 }
+
+/* ========================================================================
+   BC20 additions to the inherited cogame-battlecode chrome
+   ------------------------------------------------------------------------
+   Everything above this banner is the page as it shipped for `bc26`. Nothing
+   is removed and no existing id is reused for a different purpose: every id
+   below is new and `#bc20-` prefixed, and the two blocks are switched by ONE
+   attribute — `document.documentElement.dataset.year`, set from the replay
+   header — plus the rules right here. `#viewpanel` is KEPT: a 48x48 board
+   renders 768 px wide against a 360 px featured-match frame.
+   ======================================================================== */
+html[data-year="bc20"] #coopchip,
+html[data-year="bc20"] #bars,
+html[data-year="bc20"] #econ,
+html[data-year="bc20"] #doctrines { display: none !important; }
+
+html:not([data-year="bc20"]) #bc20-flood,
+html:not([data-year="bc20"]) #bc20-soup,
+html:not([data-year="bc20"]) #bc20-units,
+html:not([data-year="bc20"]) #bc20-doctrines,
+html:not([data-year="bc20"]) #bc20-doctrines-toggle,
+html:not([data-year="bc20"]) #bc20-chain { display: none !important; }
+
+#bc20-flood {
+  position: absolute; top: 6px; left: 50%; transform: translateX(-50%);
+  display: flex; gap: 10px; align-items: center;
+  max-width: calc(100% - 16px); box-sizing: border-box; overflow: hidden;
+  padding: 2px 10px; border-radius: 999px; font-size: 11px;
+  letter-spacing: .06em; background: rgba(11,7,4,.72); color: #7fb2e8;
+  border: 1px solid #7fb2e8; z-index: 6; white-space: nowrap;
+}
+#bc20-flood > span { flex: 0 1 auto; min-width: 0; overflow: hidden; }
+#bc20-flood.rising { color: #e0523a; border-color: #e0523a; }
+#bc20-flood .gauge {
+  width: 64px; height: 4px; border-radius: 2px;
+  background: rgba(242,232,216,.14);
+}
+#bc20-flood .gauge > i {
+  display: block; height: 100%; border-radius: 2px; background: #2f6fb0;
+}
+
+/* Both readouts sit ABOVE the reserved transport band -- nothing this block
+   adds is ever overlaid inside it. */
+#bc20-soup {
+  position: absolute; right: 8px; bottom: calc(var(--band, 0px) + 8px);
+  display: grid; grid-template-columns: auto auto auto; gap: 1px 8px;
+  font-size: 10px; color: #cbbfae; background: rgba(11,7,4,.6);
+  padding: 5px 8px; border-radius: 6px; z-index: 5; pointer-events: none;
+}
+#bc20-soup b { color: #f2e8d8; font-weight: 600; }
+
+#bc20-units {
+  position: absolute; right: 8px; bottom: calc(var(--band, 0px) + 74px);
+  font-size: 10px; color: #cbbfae; background: rgba(11,7,4,.6);
+  padding: 5px 8px; border-radius: 6px; z-index: 5; pointer-events: none;
+  font-variant-numeric: tabular-nums;
+}
+#bc20-units b { color: #f2e8d8; font-weight: 600; }
+#bc20-units .hqdirt { color: #e0523a; }
+
+/* D3, and THE BOARD IS THE PICTURE. Both doctrines are worth reading before
+   the flood starts and worth nothing at all if they are still lying over the
+   landscapers a minute later. Same discipline as the bc26 panel: it opens
+   with the replay, it CLOSES ITSELF the moment playback advances (or after
+   six seconds for a viewer who never presses play), a close control, Escape
+   and a re-open chip drive it by hand, and its body is capped and scrolls so
+   even opened over a 360 px frame it can never own the board. It sits above
+   the board area -- never inside var(--band). */
+#bc20-doctrines {
+  position: absolute; left: 8px; bottom: calc(var(--band, 0px) + 8px);
+  max-width: 46%; font-size: 10px; color: #cbbfae;
+  background: rgba(11,7,4,.72); padding: 5px 22px 5px 8px;
+  border-radius: 6px; z-index: 7;
+}
+#bc20-doctrines.dismissed { display: none !important; }
+#bc20-doctrines-body {
+  max-height: calc(30vh - var(--band, 0px)); overflow-y: auto;
+}
+#bc20-doctrines .dline { margin-bottom: 3px; }
+#bc20-doctrines .dname { color: #f2e8d8; font-weight: 600; }
+#bc20-doctrines .dfall { color: #e0523a; }
+#bc20-doctrines-close {
+  position: absolute; top: 2px; right: 4px; width: 16px; height: 16px;
+  line-height: 14px; padding: 0; border: 0; border-radius: 4px; cursor: pointer;
+  background: rgba(242,232,216,.14); color: #f2e8d8; font-size: 12px;
+}
+#bc20-doctrines-close:hover { background: rgba(242,232,216,.3); }
+#bc20-doctrines-toggle {
+  font-size: 10px; padding: 1px 8px; border-radius: 999px; cursor: pointer;
+  border: 1px solid rgba(242,232,216,.3); color: #cbbfae;
+  background: rgba(11,7,4,.6); margin-top: 3px;
+}
+#bc20-doctrines-toggle[hidden] { display: none !important; }
+
+#bc20-chain { margin-top: 6px; font-size: 11px; color: #cbbfae; }
+#bc20-chain b { color: #f2e8d8; }
+#bc20-chain .msg { opacity: .8; }
+
+/* CSS for EVERY beat kind this year emits. A kind with no rule is an
+   invisible marker. */
+.beat-marker.flood { background: #2f6fb0; }
+.beat-marker.build { background: #8fbf6a; }
+.beat-marker.wall { background: #c9a227; }
+.beat-marker.rush { background: #e0523a; width: 3px; }
+.beat-marker.drop { background: #7fb2e8; }
+.beat-marker.bury { background: #e0523a; width: 3px; }
+.beat-marker.drown { background: #2f6fb0; width: 3px; }
+
+/* At the 360 px featured-match width the flood chip keeps the two numbers a
+   spectator needs -- the water level and how much of the map is under it --
+   and drops the per-clan HQ elevations, which the #bc20-units panel repeats
+   as the HQ dirt load anyway. A chip that keeps everything is a chip that
+   runs off both ends of the frame. */
+@media (max-width: 760px) {
+  #bc20-soup, #bc20-units, #bc20-doctrines { font-size: 9px; }
+  #bc20-units { bottom: calc(var(--band, 0px) + 66px); }
+  #bc20-flood { gap: 5px; font-size: 10px; }
+  #bc20-flood .gauge { width: 34px; }
+  #bc20-flood .lbl, #bc20-flood .hqelev { display: none; }
+  #bc20-doctrines { max-width: 62%; }
+}
 </style>
 </head>
 <body>
@@ -2673,6 +2794,9 @@
           <div class="time" id="clock-time">0:00</div>
           <span class="ffwd-mini" id="ffwd-mini">▸▸</span>
           <div class="caption" id="clock-caption">In the locker room</div>
+          <!-- BC20: re-opens #bc20-doctrines after it has been dismissed. -->
+          <button type="button" id="bc20-doctrines-toggle" hidden
+                  aria-label="Show doctrines">doctrines</button>
         </div>
       </div>
 
@@ -2724,6 +2848,17 @@
     <div id="econ"></div>
     <div id="doctrines"></div>
 
+    <!-- BC20 additions to the inherited cogame-battlecode chrome -->
+    <div id="bc20-flood"></div>
+    <div id="bc20-units"></div>
+    <div id="bc20-soup"></div>
+    <div id="bc20-doctrines" role="region" aria-label="Doctrines">
+      <button type="button" id="bc20-doctrines-close"
+              aria-label="Dismiss doctrines"
+              title="Dismiss doctrines (Esc)">&times;</button>
+      <div id="bc20-doctrines-body"></div>
+    </div>
+
     <div id="transport">
       <!-- Buttons on top, scrubber/timeline below (the transport sits in its own
            reserved band under the board, so nothing here overlaps play). -->
@@ -2762,6 +2897,9 @@
       <div class="how" id="ec-how"></div>
       <!-- One stats panel per active team, generated by ensureEndcardTeams(). -->
       <div class="ec-teams" id="ec-teams"></div>
+      <!-- BC20: the blockchain panel. Nothing about the chain is stored in
+           the replay -- the wasm sim re-derives every block. -->
+      <div id="bc20-chain"></div>
       <div class="ec-replay" id="ec-replay"></div>
     </div>
   </div>
@@ -2775,6 +2913,305 @@
 <!-- CHROME_COMMON -->
 <!-- BROADCAST_CORE -->
 
+<!-- ======================================================================
+     BC20 additions to the inherited cogame-battlecode chrome
+     ----------------------------------------------------------------------
+     The game block for the `bc20` year. It registers itself on
+     `window.Bc20Block` BEFORE the inherited block runs, and the inherited
+     block calls into it: two lines there, everything else here. No function
+     name in this file collides with `chrome_common.js` or with the bc26
+     block -- the beat builder is `buildBc20BeatButtons`, never `markBeat`
+     (the tandem 2026-08-23 hoisting collision) and never `buildBeatButtons`.
+     ====================================================================== -->
+<script>
+(function () {
+  'use strict';
+
+  var api = null;                    // {C, send, seek, dismissEndcard}
+  var beatsBuilt = false;
+  var beatEls = [];
+  var dismissed = false;
+  var pinned = false;                // the viewer opened it themselves
+  var lastFrame = -1;
+  var feedShown = {};
+
+  function $(id) { return document.getElementById(id); }
+  function esc(text) {
+    return String(text == null ? '' : text)
+      .replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;')
+      .replace(/"/g, '&quot;');
+  }
+
+  // ---- the dismissible doctrine overlay (D3) ---------------------------
+  function setDoctrinesOpen(open) {
+    dismissed = !open;
+    var panel = $('bc20-doctrines');
+    var chip = $('bc20-doctrines-toggle');
+    if (panel) panel.classList.toggle('dismissed', dismissed);
+    if (chip) chip.hidden = !dismissed;
+  }
+
+  function wireDoctrines() {
+    var close = $('bc20-doctrines-close');
+    if (close) {
+      close.addEventListener('click', function (event) {
+        event.stopPropagation();
+        pinned = false;
+        setDoctrinesOpen(false);
+      });
+    }
+    var chip = $('bc20-doctrines-toggle');
+    if (chip) {
+      chip.addEventListener('click', function (event) {
+        event.stopPropagation();
+        // A panel the viewer opened by hand STAYS open -- that is their
+        // choice, not a lid the page left on the board.
+        pinned = true;
+        setDoctrinesOpen(true);
+      });
+    }
+    document.addEventListener('keydown', function (event) {
+      if (event.key !== 'Escape' && event.key !== 'Esc') return;
+      if (document.documentElement.getAttribute('data-year') !== 'bc20') return;
+      pinned = false;
+      setDoctrinesOpen(false);
+    });
+    // The viewer who never presses play still gets the board back.
+    setTimeout(function () {
+      if (!pinned) setDoctrinesOpen(false);
+    }, 6000);
+  }
+
+  // ---- beats ------------------------------------------------------------
+  function buildBc20BeatButtons(s) {
+    if (beatsBuilt || !s.beats || !s.beats.length) return;
+    beatsBuilt = true;
+    var scrub = $('scrub');
+    var span = Math.max(1, (s.mx || 1) - (s.st || 0));
+    s.beats.forEach(function (b) {
+      var el = document.createElement('button');
+      el.type = 'button';
+      el.className = 'beat-marker ' + (b.k || 'game');
+      el.style.left =
+        (Math.min(1, Math.max(0, (b.t - (s.st || 0)) / span)) * 100) + '%';
+      el.setAttribute('aria-label', b.label || b.k);
+      el.title = b.label || b.k;
+      el.__tick = b.t;
+      el.addEventListener('click', function (event) {
+        event.stopPropagation();
+        if (api) api.seek(b.t / span);
+      });
+      scrub.appendChild(el);
+      beatEls.push(el);
+    });
+  }
+
+  function applyBc20BeatSpoilers(s) {
+    if (!api || !beatEls.length) return;
+    var spoilers = api.C.getSpoilers();
+    beatEls.forEach(function (el) {
+      var hide = !spoilers && el.__tick > s.t;
+      if (el.__hidden !== hide) {
+        el.__hidden = hide;
+        el.style.display = hide ? 'none' : '';
+      }
+    });
+  }
+
+  // ---- readouts ---------------------------------------------------------
+  function renderFlood(s) {
+    var f = s.bc20_flood || {};
+    var host = $('bc20-flood');
+    if (!host) return;
+    var water = Number(f.water || 0);
+    var tiles = Math.max(1, Number(f.tiles || 1));
+    var pct = Math.round((Number(f.flooded || 0) / tiles) * 100);
+    var elev = f.hq_elevation || [-1, -1];
+    var danger = false;
+    for (var i = 0; i < 2; i++) {
+      if (elev[i] >= 0 && water >= elev[i] - 1) danger = true;
+    }
+    host.classList.toggle('rising', danger);
+    host.innerHTML =
+      '<span class="lbl">WATER</span> <b>' + water.toFixed(2) + '</b>' +
+      '<span class="gauge"><i style="width:' + pct + '%"></i></span>' +
+      '<span>' + pct + '% flooded</span>' +
+      '<span class="hqelev">' + esc(s.aliases[0]) + ' HQ elev ' + elev[0] +
+        '</span>' +
+      '<span class="hqelev">' + esc(s.aliases[1]) + ' HQ elev ' + elev[1] +
+        '</span>';
+  }
+
+  function renderSoup(s) {
+    var rows = s.bc20_soup || [{}, {}];
+    var host = $('bc20-soup');
+    if (!host) return;
+    var html = '<span></span><span>' + esc(s.aliases[0]) + '</span><span>' +
+      esc(s.aliases[1]) + '</span>';
+    [['pool', 'soup'], ['mined', 'mined'], ['refined', 'refined']]
+      .forEach(function (row) {
+        html += '<span>' + row[1] + '</span><b>' + (rows[0][row[0]] || 0) +
+          '</b><b>' + (rows[1][row[0]] || 0) + '</b>';
+      });
+    host.innerHTML = html;
+  }
+
+  var UNIT_ROWS = [
+    ['miner', 'Mi'], ['landscaper', 'La'], ['drone', 'Dr'],
+    ['vaporator', 'Va'], ['net_gun', 'NG'], ['design_school', 'DS'],
+    ['fulfillment_center', 'FC']
+  ];
+
+  function renderUnits(s) {
+    var rows = s.bc20_units || [{}, {}];
+    var host = $('bc20-units');
+    if (!host) return;
+    var html = '';
+    for (var slot = 0; slot < 2; slot++) {
+      var u = rows[slot] || {};
+      var line = [];
+      UNIT_ROWS.forEach(function (r) {
+        line.push(r[1] + ' <b>' + (u[r[0]] || 0) + '</b>');
+      });
+      html += '<div>' + esc(s.aliases[slot]) + ' ' + line.join(' ') +
+        ' <span class="hqdirt">dirt ' + (u.hq_dirt || 0) + '/' +
+        (u.hq_dirt_limit || 50) + '</span></div>';
+    }
+    host.innerHTML = html;
+  }
+
+  function renderDoctrines(s) {
+    var host = $('bc20-doctrines-body');
+    if (!host) return;
+    var html = '';
+    (s.doctrines || []).forEach(function (d, slot) {
+      html += '<div class="dline"><span class="dname">' +
+        esc(s.aliases[slot]) + '</span> ' + esc(d.name || '') + ' — ' +
+        esc((d.words || []).join(', ')) +
+        (d.fallback ? ' <span class="dfall">[fallback: ' +
+          esc(d.fallback) + ']</span>' : '') +
+        (d.notes ? '<br><i>' + esc(d.notes) + '</i>' : '') + '</div>';
+    });
+    host.innerHTML = html;
+  }
+
+  function renderFeed(s) {
+    var feed = $('killfeed');
+    if (!feed || !s.beats) return;
+    s.beats.forEach(function (b) {
+      var key = b.t + '|' + b.k + '|' + b.label;
+      if (feedShown[key] || b.t > s.t) return;
+      feedShown[key] = true;
+      var row = document.createElement('div');
+      row.className = 'kf-row ' + b.k;
+      row.textContent = b.label;
+      feed.appendChild(row);
+      while (feed.childNodes.length > 8) feed.removeChild(feed.firstChild);
+    });
+  }
+
+  function renderChain(s) {
+    var host = $('bc20-chain');
+    var c = s.bc20_chain;
+    if (!host || !c) return;
+    var html = '<b>blockchain</b> — ' +
+      esc(s.aliases[0]) + ' ' + (c.minted || [0, 0])[0] + ' minted, ' +
+      (c.soup_spent || [0, 0])[0] + ' soup · ' +
+      esc(s.aliases[1]) + ' ' + (c.minted || [0, 0])[1] + ' minted, ' +
+      (c.soup_spent || [0, 0])[1] + ' soup';
+    var top = c.top_fee || [0, 0];
+    var topRound = c.top_fee_round || [-1, -1];
+    for (var i = 0; i < 2; i++) {
+      if (top[i] > 0) {
+        html += '<br>' + esc(s.aliases[i]) + '\u2019s top fee ' + top[i] +
+          ' bought round ' + topRound[i];
+      }
+    }
+    (c.recent || []).forEach(function (m) {
+      html += '<br><span class="msg">' + esc(m.alias) + ', round ' +
+        m.round + ' — ' + esc(m.words) + '</span>';
+    });
+    host.innerHTML = html;
+  }
+
+  function renderEndcardExtras(s) {
+    if (s.ph !== 'gameover') return;
+    var r = s.result || {};
+    var last = (r.games || [])[(r.games || []).length - 1];
+    if (!last) return;
+    var wincond = $('ec-wincond');
+    if (wincond) {
+      var who = last.winner >= 0 ? s.aliases[last.winner] : 'nobody';
+      var loser = last.winner >= 0 ? s.aliases[1 - last.winner] : 'nobody';
+      var text;
+      if (last.end_reason === 'hq_destroyed') {
+        var cause = (last.hq_lost_cause || [])[1 - last.winner] || 'none';
+        text = cause === 'buried'
+          ? who + ' buried ' + loser + '\u2019s HQ at round ' +
+            ((last.hq_lost_round || [])[1 - last.winner] || last.rounds_played) +
+            ' under 50 dirt'
+          : loser + '\u2019s HQ drowned at round ' +
+            ((last.hq_lost_round || [])[1 - last.winner] || last.rounds_played) +
+            ', water ' + Number(last.water_level_end || 0).toFixed(2);
+      } else if (last.end_reason === 'quantity') {
+        text = 'round limit — ' + who + ' held ' +
+          ((last.units_alive || [])[last.winner] || 0) + ' robots to ' +
+          ((last.units_alive || [])[1 - last.winner] || 0);
+      } else {
+        text = 'the ' + String(last.end_reason).replace(/_/g, ' ') +
+          ' rung of the ladder decided it';
+      }
+      wincond.textContent = text;
+    }
+    var how = $('ec-how');
+    if (how) {
+      var scores = r.scores || [0, 0];
+      how.innerHTML =
+        'score ' + scores[0] + ' — ' + scores[1] +
+        ' · soup refined ' + ((last.soup_refined || [])[0] || 0) + '/' +
+        ((last.soup_refined || [])[1] || 0) +
+        ' · landscapers ' + ((last.landscapers_built || [])[0] || 0) + '/' +
+        ((last.landscapers_built || [])[1] || 0) +
+        ' · dirt moved ' + ((last.dirt_moved || [])[0] || 0) + '/' +
+        ((last.dirt_moved || [])[1] || 0) +
+        ' · drones downed ' + ((last.net_gun_kills || [])[0] || 0) + '/' +
+        ((last.net_gun_kills || [])[1] || 0) +
+        ' · dropped in the water ' + ((last.drone_water_drops || [])[0] || 0) +
+        '/' + ((last.drone_water_drops || [])[1] || 0);
+    }
+    renderChain(s);
+  }
+
+  window.Bc20Block = {
+    attach: function (host) {
+      api = host;
+      wireDoctrines();
+    },
+    // True while a bc20 replay is on screen; the inherited block asks before
+    // it draws its own year's readouts.
+    active: function (s) { return s && s.year === 'bc20'; },
+    onFrame: function (s) {
+      document.documentElement.setAttribute('data-year', s.year || 'bc26');
+      if (s.year !== 'bc20') return;
+      buildBc20BeatButtons(s);
+      // THE BOARD IS THE PICTURE: the first frame that advances the playhead
+      // closes the panel, unless the viewer opened it by hand.
+      if (lastFrame >= 0 && s.t > lastFrame && !pinned && !dismissed) {
+        setDoctrinesOpen(false);
+      }
+      lastFrame = s.t;
+      renderFlood(s);
+      renderSoup(s);
+      renderUnits(s);
+      renderDoctrines(s);
+      renderFeed(s);
+      applyBc20BeatSpoilers(s);
+      renderEndcardExtras(s);
+    }
+  };
+})();
+</script>
+
 <script>
 (function () {
   'use strict';
@@ -2812,6 +3249,18 @@
   var statusEl = $('status');
   var stage = $('stage');
 
+  // BC20 HOOK (1 of 2): hand the appended bc20 game block the transport it
+  // needs. `seek` and `dismissEndcard` are function declarations below and
+  // are hoisted, so this runs before either is defined and still binds them.
+  if (window.Bc20Block) {
+    window.Bc20Block.attach({
+      C: C,
+      send: send,
+      seek: function (frac) { seek(frac); },
+      dismissEndcard: function () { dismissEndcard(); }
+    });
+  }
+
   // ---- beats ------------------------------------------------------------
   // Deliberately NOT named markBeat: the starter's chrome_common already
   // exports one, and a same-named function in this block would hoist over
@@ -3201,16 +3650,24 @@
     var s;
     try { s = JSON.parse(text); } catch (error) { return; }
     lastState = s;
-    buildBeatButtons(s);
+    // BC20 HOOK (2 of 2): the replay header's `year` picks which game block
+    // draws. The scorebug, the clock, the transport, the scrubber and the
+    // endcard shell are SHARED and stay here; only the year's own readouts
+    // are switched, by `html[data-year]` in CSS and by this branch.
+    var isBc20 = !!(window.Bc20Block && window.Bc20Block.active(s));
+    if (window.Bc20Block) window.Bc20Block.onFrame(s);
+    if (!isBc20) {
+      buildBeatButtons(s);
+      renderCoop(s);
+      renderEcon(s);
+      renderDoctrines(s);
+      renderFeed(s);
+    }
     renderScorebug(s);
-    renderCoop(s);
-    renderEcon(s);
     renderGameChips(s);
-    renderDoctrines(s);
-    renderFeed(s);
     C.renderClock(s);
     C.renderTransport(s);
-    applyBeatSpoilers(s);
+    if (!isBc20) applyBeatSpoilers(s);
     $('clock-caption').textContent = s.ph === 'gameover'
       ? 'Match over'
       : 'game ' + s.game + ' of ' + s.games + ' — ' + s.map;
diff --git a/tests/test_viewer.nim b/tests/test_viewer.nim
index 682ac7f..c209021 100644
--- a/tests/test_viewer.nim
+++ b/tests/test_viewer.nim
@@ -163,6 +163,61 @@ check("and on the spoiler toggle",
 check("the killfeed has no unreachable spoiler guard",
   "if (!C.getSpoilers() && b.t > s.t) return;" notin page)
 
+## ---- THE APPENDED bc20 GAME BLOCK -----------------------------------------
+## No starter element is removed and no existing id is reused: every id the
+## bc20 block adds is new and prefixed.
+for added in ["id=\"bc20-flood\"", "id=\"bc20-soup\"", "id=\"bc20-units\"",
+              "id=\"bc20-doctrines\"", "id=\"bc20-doctrines-close\"",
+              "id=\"bc20-doctrines-toggle\"", "id=\"bc20-chain\""]:
+  check("the bc20 block adds " & added, added in page)
+check("under its own banner comment",
+  "BC20 additions to the inherited cogame-battlecode chrome" in page)
+check("and the bc26 block's own elements are still there",
+  "id=\"coopchip\"" in page and "id=\"doctrines\"" in page)
+
+## The year is ONE attribute plus CSS, not a rewrite.
+check("the block sets data-year from the replay header",
+  "setAttribute('data-year'" in page)
+check("and the stylesheet hides the other year's readouts",
+  "html[data-year=\"bc20\"] #coopchip" in page)
+check("both ways", "html:not([data-year=\"bc20\"]) #bc20-flood" in page)
+
+## D3: the doctrine overlay is DISMISSIBLE and never sits in the transport
+## band.
+check("the overlay's close control names itself for a screen reader",
+  "aria-label=\"Dismiss doctrines\"" in page)
+check("Escape dismisses it", "event.key !== 'Escape'" in page)
+check("and a chip re-opens it", "setDoctrinesOpen(true)" in page)
+block:
+  let start = page.find("#bc20-doctrines {")
+  check("the page has a #bc20-doctrines rule", start >= 0)
+  let rule = page[start ..< page.find("}", start)]
+  check("and it sits ABOVE the transport band",
+    "bottom: calc(var(--band, 0px) + 8px);" in rule)
+for panel in ["#bc20-soup {", "#bc20-units {"]:
+  let start = page.find(panel)
+  check("the page has a " & panel & " rule", start >= 0)
+  let rule = page[start ..< page.find("}", start)]
+  check(panel & " sits above the transport band too",
+    "var(--band, 0px) +" in rule)
+
+## CSS for EVERY beat kind bc20 emits — all ten.
+for kind in ["doctrine", "game", "flood", "build", "wall", "rush", "drop",
+             "bury", "drown", "end"]:
+  check("the page styles .beat-marker." & kind & " (bc20)",
+    ".beat-marker." & kind in page)
+
+## The tandem hoisting collision, again: the bc20 block's beat builder may
+## share neither `markBeat` nor the bc26 block's `buildBeatButtons`.
+check("the bc20 block has its OWN beat builder",
+  "function buildBc20BeatButtons" in page)
+check("and its own spoiler gate", "function applyBc20BeatSpoilers" in page)
+for aliased in ["renderClock", "renderTransport", "getSpoilers",
+                "setSpoilers", "renderBeatMarkers", "markBeat",
+                "buildBeatButtons"]:
+  check("the bc20 block does not shadow " & aliased,
+    page.count("function " & aliased & "(") <= 1)
+
 ## Transport rules from the design note.
 check("relayout sets --hudscale", "--hudscale" in page)
 check("relayout sets --topband", "--topband" in page)
diff --git a/tools/ci/check_gameversion.sh b/tools/ci/check_gameversion.sh
index 579ca47..9e23b43 100755
--- a/tools/ci/check_gameversion.sh
+++ b/tools/ci/check_gameversion.sh
@@ -33,7 +33,10 @@ line() {
   # The GameVersion declaration line from one ref, or empty if unreadable.
   git show "$1:$CONST_FILE" 2>/dev/null | grep -m1 'GameVersion\* ='
 }
-ver()  { line "$1" | grep -o '"[0-9]*"' | tr -d '"'; }
+# The constant is `GameVersion* = "GV04"`, so the digits sit behind a `GV`
+# prefix; `grep -o '"[0-9]*"'` matched nothing and every invocation died on
+# "could not read GameVersion" instead of comparing anything.
+ver()  { line "$1" | grep -o '"GV[0-9]*"' | tr -d '"GV'; }
 rule() { line "$1" | sed 's/.*## //'; }
 
 base_v=$(ver "$BASE"); head_v=$(ver "$HEAD_REF")
diff --git a/tools/ci/docker_smoke.sh b/tools/ci/docker_smoke.sh
index d2db1ca..7c335b6 100755
--- a/tools/ci/docker_smoke.sh
+++ b/tools/ci/docker_smoke.sh
@@ -39,6 +39,19 @@
 #   SMOKE_REQUIRE_REPLAY_JSON  1 = replay must parse as JSON    (1)
 #                              set 0 for binary replay formats
 #   SMOKE_EXTRA_ENV            extra "K=V K=V" for every player (empty)
+#   SMOKE_CONFIG_OVERRIDE      JSON object merged over the certification
+#                              fixture's game_config, so a SECOND episode can
+#                              exercise a different year without a second
+#                              certification fixture. num_agents and the seat
+#                              count still come from the fixture and may not
+#                              be overridden. (empty)
+#   SMOKE_PLAYER_IDS           comma-separated manifest player ids, one per
+#                              seat, replacing certification.players for this
+#                              run -- the bc20 episode seats
+#                              bowl-of-chowder and examplefuncsplayer.
+#                              (empty = the certification fixture's seats)
+#   SMOKE_EXPECT_YEAR          if set, results.year and the replay's year must
+#                              equal it (empty)
 #   SMOKE_REPLAY_OUT           where to COPY the replay this smoke produced,
 #                              so it outlives the scratch dir the trap deletes
 #                              (dist/smoke/replay.json). ci.yml uploads it as
@@ -66,6 +79,9 @@ contract_probe="${SMOKE_CONTRACT_PROBE:-1}"
 timeout_s="${SMOKE_TIMEOUT:-900}"
 require_replay_json="${SMOKE_REQUIRE_REPLAY_JSON:-1}"
 replay_out="${SMOKE_REPLAY_OUT:-${repo_dir}/dist/smoke/replay.json}"
+config_override="${SMOKE_CONFIG_OVERRIDE:-}"
+player_ids="${SMOKE_PLAYER_IDS:-}"
+expect_year="${SMOKE_EXPECT_YEAR:-}"
 
 run_id="$$"
 prefix="${slug}-smoke-${run_id}"
@@ -100,6 +116,7 @@ test -f "${manifest}" || { echo "manifest not found: ${manifest}" >&2; exit 1; }
 # --------------------------------------------------------------------------
 # Episode config + per-seat launch args, derived from the cert fixture.
 # --------------------------------------------------------------------------
+SMOKE_CONFIG_OVERRIDE="${config_override}" SMOKE_PLAYER_IDS="${player_ids}" \
 python3 - "${manifest}" "${work_dir}" "${player_bin}" "${seats_expected}" <<'PY'
 import json
 import os
@@ -160,12 +177,41 @@ if str(seats_expected).isdigit() and int(seats_expected) != seats:
         "manifest disagree; fix whichever is wrong."
     )
 
+# A SECOND episode, on another year, needs another game_config -- but not
+# another certification fixture: certification stays where it is, and the
+# override may not touch the seat count it declares.
+override = os.environ.get("SMOKE_CONFIG_OVERRIDE") or ""
+if override.strip():
+    try:
+        patch = json.loads(override)
+    except Exception as exc:
+        raise SystemExit(f"SMOKE_CONFIG_OVERRIDE is not JSON: {exc}") from exc
+    if not isinstance(patch, dict):
+        raise SystemExit("SMOKE_CONFIG_OVERRIDE must be a JSON object")
+    if "num_agents" in patch and patch["num_agents"] != seats:
+        raise SystemExit(
+            "SEAT-COUNT FAIL: SMOKE_CONFIG_OVERRIDE may not change num_agents; "
+            f"the certification fixture declares {seats}")
+    config.update(patch)
+    print(f"config override applied: {sorted(patch)}")
+
 players = list(fixture_players)
 while len(players) < seats:
     players.append({"name": f"smoke-{len(players)}"})
 config["players"] = players[:seats]
 config["tokens"] = [f"token-{i}" for i in range(seats)]
 
+# The seats this run drives. Defaults to the certification fixture's.
+override_ids = [s for s in (os.environ.get("SMOKE_PLAYER_IDS") or "").split(",")
+                if s.strip()]
+if override_ids:
+    if len(override_ids) != seats:
+        raise SystemExit(
+            f"SEAT-COUNT FAIL: SMOKE_PLAYER_IDS names {len(override_ids)} "
+            f"seats, the fixture declares {seats}")
+    cert_players = [{"player_id": s.strip()} for s in override_ids]
+    print(f"player ids overridden: {[p['player_id'] for p in cert_players]}")
+
 with open(os.path.join(work, "config.json"), "w") as fh:
     json.dump(config, fh, indent=2)
 
@@ -327,7 +373,7 @@ echo "all ${seats} player containers exited 0"
 # --------------------------------------------------------------------------
 # Assert the artifacts.
 # --------------------------------------------------------------------------
-if ! python3 - "${work_dir}" "${seats}" "${require_replay_json}" <<'PY'
+if ! python3 - "${work_dir}" "${seats}" "${require_replay_json}" "${expect_year}" <<'PY'
 import json
 import sys
 from pathlib import Path
@@ -335,6 +381,7 @@ from pathlib import Path
 work = Path(sys.argv[1])
 seats = int(sys.argv[2])
 require_replay_json = sys.argv[3] not in ("0", "", "false", "no")
+expect_year = sys.argv[4] if len(sys.argv) > 4 else ""
 
 failure = work / "player_failure.json"
 if failure.exists():
@@ -382,6 +429,9 @@ if results["reason"] != "complete":
 if results["fallbacks"] != [0] * seats:
     raise SystemExit(
         f"a scripted seat reported a fallback: {results['fallbacks']!r}")
+if expect_year and results.get("year") != expect_year:
+    raise SystemExit(
+        f"results.year is {results.get('year')!r}, expected {expect_year!r}")
 for key in ("aliases", "wins", "points", "policy_kind",
             "sheet_defaults_applied", "fallbacks", "decision_ms"):
     if len(results[key]) != seats:
@@ -414,6 +464,9 @@ if require_replay_json:
         raise SystemExit("replay has an empty events array")
     if not replay.get("games"):
         raise SystemExit("replay recorded no games")
+    if expect_year and replay.get("year") != expect_year:
+        raise SystemExit(
+            f"replay year is {replay.get('year')!r}, expected {expect_year!r}")
     # --------------------------------------------------------- /battlecode
 
 print(
diff --git a/tools/ci/renderer_fixture.html b/tools/ci/renderer_fixture.html
index b0854fa..43c83ad 100644
--- a/tools/ci/renderer_fixture.html
+++ b/tools/ci/renderer_fixture.html
@@ -60,8 +60,12 @@
   // to everything except one lenient viewer.
   var MAX_NOTE_RUNES = 280;
   var MAX_MOTTO_RUNES = 48;
-  // The featured-match frame, a tablet width and desktop.
+  // The featured-match frame, a tablet width and desktop -- ONE ROW PER
+  // YEAR, because each year's readouts are different elements under
+  // different CSS and a fixture that only lays out bc26 says nothing about
+  // bc20's flood, soup, unit and doctrine panels.
   var SIZES = [[360, 640], [720, 900], [1280, 720]];
+  var YEARS = ['bc26', 'bc20'];
 
   function runes(text) { return Array.from(text); }
   function repeatRunes(text, count) {
@@ -77,6 +81,7 @@
 
   var params = new URLSearchParams(location.search);
   var inner = params.get('w');
+  var year = params.get('year') === 'bc20' ? 'bc20' : 'bc26';
 
   // ------------------------------------------------------------------
   // Parent: one iframe per width, each posting its own verdict back.
@@ -88,13 +93,18 @@
     var readout = document.createElement('div');
     readout.id = 'verdict';
     document.body.appendChild(readout);
-    var frames = SIZES.map(function (size) {
-      var frame = document.createElement('iframe');
-      frame.width = String(size[0]);
-      frame.height = String(size[1]);
-      frame.src = location.pathname + '?w=' + size[0];
-      box.appendChild(frame);
-      return frame;
+    var frames = [];
+    var labels = [];
+    YEARS.forEach(function (year) {
+      SIZES.forEach(function (size) {
+        var frame = document.createElement('iframe');
+        frame.width = String(size[0]);
+        frame.height = String(size[1]);
+        frame.src = location.pathname + '?w=' + size[0] + '&year=' + year;
+        box.appendChild(frame);
+        frames.push(frame);
+        labels.push(year + ' @ ' + size[0] + 'px');
+      });
     });
     var deadline = Date.now() + 30000;
     (function collect() {
@@ -111,9 +121,9 @@
           return;
         }
         if (!child || child.__fixtureVerdict === undefined) { pending = true; continue; }
-        lines.push(SIZES[i][0] + 'px: ' + (child.__fixtureVerdict || 'ok'));
+        lines.push(labels[i] + ': ' + (child.__fixtureVerdict || 'ok'));
         if (child.__fixtureVerdict && !problem) {
-          problem = SIZES[i][0] + 'px: ' + child.__fixtureVerdict;
+          problem = labels[i] + ': ' + child.__fixtureVerdict;
         }
       }
       readout.textContent = lines.join('\n');
@@ -160,6 +170,11 @@
   // relayout()'s own arithmetic (client/replay_broadcast.html): --hudscale
   // from the width, --topband from the scale, --band from the measured
   // transport height (76 px is what the inherited bar measures).
+  // ONE ATTRIBUTE picks the year, exactly as the page does from the replay
+  // header; the stylesheet extracted from client/replay_broadcast.html then
+  // shows one block and hides the other.
+  document.documentElement.setAttribute('data-year', year);
+
   var scale = Math.max(0.62, Math.min(1, window.innerWidth / 1100));
   var root = document.documentElement.style;
   root.setProperty('--hudscale', String(scale));
@@ -193,6 +208,34 @@
   }
   doctrines += '</div>';
 
+  // --- the bc20 row: the same full-cap strings through bc20's own words ---
+  var BC20_WORDS = [
+    'lattices inward first, never commits a rush, walls at 250, terraforms ' +
+      'from 300, lattice radius 6, steady landscapers, steady miners, ' +
+      '2 vaporators, drones harass, 2 net guns',
+    'rushes the enemy HQ, commits at round 240, walls at 300, terraforms ' +
+      'from 500, lattice radius 3, swarm landscapers, lean miners, ' +
+      'no vaporators, drones bust walls, no net guns'
+  ];
+  var bc20Soup = '<span></span><span>Clan Ash</span><span>Clan Basil</span>';
+  [['soup', 1482, 903], ['mined', 24800, 19310], ['refined', 18240, 15102]]
+    .forEach(function (r) {
+      bc20Soup += '<span>' + r[0] + '</span><b>' + r[1] + '</b><b>' +
+        r[2] + '</b>';
+    });
+  var bc20Units = '';
+  for (var u = 0; u < 2; u++) {
+    bc20Units += '<div>' + ALIASES[u] +
+      ' Mi <b>12</b> La <b>18</b> Dr <b>9</b> Va <b>4</b> NG <b>3</b> ' +
+      'DS <b>2</b> FC <b>1</b> <span class="hqdirt">dirt 34/50</span></div>';
+  }
+  var bc20Doctrines = '';
+  for (var v = 0; v < 2; v++) {
+    bc20Doctrines += '<div class="dline"><span class="dname">' + ALIASES[v] +
+      '</span> ' + NAMES[v] + ' — ' + BC20_WORDS[v] +
+      '<br><i>' + notes + '</i></div>';
+  }
+
   document.body.innerHTML =
     '<div id="viewport"><div id="stage"><div id="chrome">' +
       '<div id="scorebug">' +
@@ -200,12 +243,24 @@
         '<div class="clock-col"><div class="clock amb" id="clock">' +
           '<div class="time" id="clock-time">0:00</div>' +
           '<div class="caption" id="clock-caption">game 3 of 3 — DefaultMedium</div>' +
+          '<button type="button" id="bc20-doctrines-toggle" hidden>doctrines</button>' +
         '</div></div>' +
         '<div class="plates" id="plates-r">' + plate(1, 'basil') + '</div>' +
       '</div>' +
       '<div id="coopchip" class="backstab">BACKSTAB — Clan Basil, round 1612</div>' +
       '<div id="econ">' + econ + '</div>' +
       '<div id="doctrines">' + doctrines + '</div>' +
+      '<div id="bc20-flood"><span class="lbl">WATER</span> <b>4.71</b>' +
+        '<span class="gauge"><i style="width:62%"></i></span>' +
+        '<span>62% flooded</span>' +
+        '<span class="hqelev">CLAN ASH HQ elev 8</span>' +
+        '<span class="hqelev">CLAN BASIL HQ elev 3</span></div>' +
+      '<div id="bc20-units">' + bc20Units + '</div>' +
+      '<div id="bc20-soup">' + bc20Soup + '</div>' +
+      '<div id="bc20-doctrines">' +
+        '<button type="button" id="bc20-doctrines-close" ' +
+        'aria-label="Dismiss doctrines">&times;</button>' +
+        '<div id="bc20-doctrines-body">' + bc20Doctrines + '</div></div>' +
     '</div></div></div>';
 
   // The verdict: nothing may leave the frame, and nothing may hide text
@@ -213,7 +268,8 @@
   // containers — a container fixed to the frame's width cannot report that
   // the caption inside it ran off the end.
   function problem() {
-    if (getComputedStyle(document.getElementById('doctrines')).position !==
+    var probe = year === 'bc20' ? 'bc20-doctrines' : 'doctrines';
+    if (getComputedStyle(document.getElementById(probe)).position !==
         'absolute') {
       return 'page_styles.css did not load — the fixture would be testing ' +
         'nothing (extracted from client/replay_broadcast.html by ci.yml)';
@@ -249,9 +305,12 @@
     // clips its own text reads short and reports nothing. (The inherited
     // clock column is measured for containment above, but its text is the
     // starter's, not a doctrine's.)
-    var filled = document.querySelectorAll(
-      '#scorebug .plate, #scorebug .plate *, #coopchip, #econ, #econ *, ' +
-      '#doctrines, #doctrines *');
+    var filled = document.querySelectorAll(year === 'bc20'
+      ? '#scorebug .plate, #scorebug .plate *, #bc20-flood, #bc20-flood *, ' +
+        '#bc20-soup, #bc20-soup *, #bc20-units, #bc20-units *, ' +
+        '#bc20-doctrines, #bc20-doctrines *'
+      : '#scorebug .plate, #scorebug .plate *, #coopchip, #econ, #econ *, ' +
+        '#doctrines, #doctrines *');
     for (var j = 0; j < filled.length; j++) {
       var node = filled[j];
       var nodeStyle = getComputedStyle(node);
@@ -288,8 +347,10 @@
         runes(NAMES[0]).length + 3 + MAX_MOTTO_RUNES) {
       return 'the motto was shortened before it was measured';
     }
-    if (document.querySelectorAll('#doctrines .dline i')[0].textContent !==
-        notes) {
+    var shown = year === 'bc20'
+      ? document.querySelectorAll('#bc20-doctrines .dline i')
+      : document.querySelectorAll('#doctrines .dline i');
+    if (!shown.length || shown[0].textContent !== notes) {
       return 'the notes were shortened before they were measured';
     }
     return null;
diff --git a/tools/oracle/Bc20Oracle.java b/tools/oracle/Bc20Oracle.java
new file mode 100644
index 0000000..3b55cdf
--- /dev/null
+++ b/tools/oracle/Bc20Oracle.java
@@ -0,0 +1,202 @@
+// The bc20 PARITY ORACLE, JDK side. CI-ONLY: there is no JDK, no JRE and no
+// upstream Java source in any image this repository builds.
+//
+// WHAT THIS IS, AND WHY IT IS NOT THE WHOLE ENGINE
+// -----------------------------------------------
+// The design note asks for the 2020 engine built from source and driven
+// head-to-head against the Nim port. That build is BLOCKED BY A DEAD
+// ARTIFACT: `engine/build.gradle` depends on `net.sf.jsi:jsi:1.1.0-SNAPSHOT`,
+// which was published only to jcenter (shut down 2022) and to the Sonatype OSS
+// SNAPSHOTS repository (expired). Both 404 today, and the engine's
+// `world/ObjectInfo.java` imports `net.sf.jsi` directly, so nothing resolves
+// and `:engine:jar` cannot be produced without patching the upstream build --
+// which would make the "unmodified engine" oracle a modified one.
+//
+// What DOES still work is the part of the engine that has no dependencies at
+// all. `common/GameConstants.java`, `common/RobotType.java`,
+// `common/Transaction.java`, `common/Direction.java`, `common/Team.java` and
+// `world/IDGenerator.java` compile with a bare `javac` against the pinned
+// checkout, and between them they own every piece of arithmetic the Nim port
+// could get subtly wrong and never notice:
+//
+//   * the water level, which is `Math.exp`/`Math.sin` and therefore a HotSpot
+//     intrinsic;
+//   * both pollution coefficients, which are `float` narrowings of `double`
+//     expressions;
+//   * `Transaction.compareTo`, which decides the minting order;
+//   * `IDGenerator`, whose 48-bit LCG and Fisher-Yates block shuffle decide
+//     every robot id, and therefore the `highest_id` tiebreak rung and the
+//     cow RNG seeds;
+//   * the constants and the `RobotType` table themselves.
+//
+// This program emits all of that as a text vector file. `tools/parity_trace_bc20.nim`
+// emits the same file from the Nim port and the job diffs them, byte for byte.
+//
+//   javac -d /tmp/oracle/classes \
+//     $BC20_DIR/engine/src/main/battlecode/common/{GameConstants,RobotType,Transaction,Direction,Team}.java \
+//     $BC20_DIR/engine/src/main/battlecode/world/IDGenerator.java \
+//     tools/oracle/Bc20Oracle.java
+//   java -cp /tmp/oracle/classes Bc20Oracle > /tmp/oracle/java.vectors
+//
+// docs/PARITY.md section bc20 records what each tier proves and what the dead
+// artifact costs.
+
+import battlecode.common.Direction;
+import battlecode.common.GameConstants;
+import battlecode.common.RobotType;
+import battlecode.common.Transaction;
+import battlecode.world.IDGenerator;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Random;
+
+public final class Bc20Oracle {
+
+    static String f32(float v) {
+        return String.format("%08x", Float.floatToRawIntBits(v));
+    }
+
+    public static void main(String[] args) {
+        StringBuilder o = new StringBuilder();
+
+        // -- constants -----------------------------------------------------
+        o.append("constants\n");
+        o.append("MIN_WATER_ELEVATION ").append(GameConstants.MIN_WATER_ELEVATION).append('\n');
+        o.append("INITIAL_SOUP ").append(GameConstants.INITIAL_SOUP).append('\n');
+        o.append("BASE_INCOME_PER_ROUND ").append(GameConstants.BASE_INCOME_PER_ROUND).append('\n');
+        o.append("SOUP_MINING_RATE ").append(GameConstants.SOUP_MINING_RATE).append('\n');
+        o.append("MAX_DIRT_DIFFERENCE ").append(GameConstants.MAX_DIRT_DIFFERENCE).append('\n');
+        o.append("DELIVERY_DRONE_PICKUP_RADIUS_SQUARED ")
+                .append(GameConstants.DELIVERY_DRONE_PICKUP_RADIUS_SQUARED).append('\n');
+        o.append("NET_GUN_SHOOT_RADIUS_SQUARED ")
+                .append(GameConstants.NET_GUN_SHOOT_RADIUS_SQUARED).append('\n');
+        o.append("BLOCKCHAIN_TRANSACTION_LENGTH ")
+                .append(GameConstants.BLOCKCHAIN_TRANSACTION_LENGTH).append('\n');
+        o.append("NUMBER_OF_TRANSACTIONS_PER_BLOCK ")
+                .append(GameConstants.NUMBER_OF_TRANSACTIONS_PER_BLOCK).append('\n');
+        o.append("INITIAL_COOLDOWN_TURNS ")
+                .append(GameConstants.INITIAL_COOLDOWN_TURNS).append('\n');
+
+        // -- the RobotType table -------------------------------------------
+        o.append("robottypes\n");
+        for (RobotType t : RobotType.values()) {
+            o.append(t.name()).append(' ')
+                    .append(t.cost).append(' ')
+                    .append(t.dirtLimit).append(' ')
+                    .append(t.soupLimit).append(' ')
+                    .append(f32(t.actionCooldown)).append(' ')
+                    .append(t.sensorRadiusSquared).append(' ')
+                    .append(t.pollutionRadiusSquared).append(' ')
+                    .append(t.localPollutionAdditiveEffect).append(' ')
+                    .append(f32(t.localPollutionMultiplicativeEffect)).append(' ')
+                    .append(t.globalPollutionAmount).append(' ')
+                    .append(t.maxSoupProduced).append(' ')
+                    .append(t.isBuilding() ? 1 : 0).append(' ')
+                    .append(t.canRefine() ? 1 : 0).append(' ')
+                    .append(t.canAffectPollution() ? 1 : 0).append(' ')
+                    .append(t.canMove() ? 1 : 0).append(' ')
+                    .append(t.canFly() ? 1 : 0).append(' ')
+                    .append(t.canBePickedUp() ? 1 : 0).append(' ')
+                    .append(t.canShoot() ? 1 : 0).append(' ')
+                    .append(t.canBeShot() ? 1 : 0).append('\n');
+        }
+
+        // -- Direction, whose ordinals the map files and the cow provider
+        //    index into ---------------------------------------------------
+        o.append("directions\n");
+        for (Direction d : Direction.allDirections()) {
+            o.append(d.name()).append(' ').append(d.dx).append(' ')
+                    .append(d.dy).append(' ').append(d.opposite().name()).append('\n');
+        }
+
+        // -- the water level, every round in the cap -----------------------
+        o.append("water\n");
+        for (int r = 0; r <= 1500; r++) {
+            o.append(r).append(' ').append(f32(GameConstants.getWaterLevel(r))).append('\n');
+        }
+
+        // -- both pollution coefficients, the WHOLE integer domain ---------
+        o.append("pollution\n");
+        for (int p = 0; p <= 65535; p++) {
+            o.append(p).append(' ')
+                    .append(f32(GameConstants.getCooldownPollutionCoefficient(p)))
+                    .append(' ')
+                    .append(f32(GameConstants.getSensorRadiusPollutionCoefficient(p)))
+                    .append('\n');
+        }
+
+        // -- Math.round(float), which is how a sensed radius and a pollution
+        //    reading are narrowed ------------------------------------------
+        o.append("round\n");
+        float[] probes = {0.0f, 0.5f, -0.5f, 1.4999999f, 2.5f, -2.5f,
+                35.0f, 27.65f, 6.9999995f, 1e7f, -1e7f};
+        for (float v : probes) {
+            o.append(f32(v)).append(' ').append(Math.round(v)).append('\n');
+        }
+
+        // -- IDGenerator: the ids every map seed produces -------------------
+        o.append("ids\n");
+        int[] seeds = {30, 432, 219, 9999, 43223, 118811, 198248, 4444, 6370};
+        for (int seed : seeds) {
+            IDGenerator gen = new IDGenerator(seed);
+            o.append(seed);
+            for (int i = 0; i < 24; i++) {
+                o.append(' ').append(gen.nextID());
+            }
+            o.append('\n');
+        }
+
+        // -- java.util.Random: the transaction-id stream and the cow stream -
+        o.append("random\n");
+        for (int seed : seeds) {
+            Random r = new Random(seed);
+            o.append(seed);
+            for (int i = 0; i < 8; i++) {
+                o.append(' ').append(r.nextInt());
+            }
+            o.append('\n');
+        }
+        o.append("cowseeds\n");
+        for (int seed : seeds) {
+            for (int id = 0; id < 6; id++) {
+                // `84307 * mapSeed + 20201 * (cowId / 2)` is Java `int`
+                // arithmetic and it OVERFLOWS. This vector is what proves the
+                // Nim port wraps rather than raising.
+                int cowSeed = 84307 * seed + 20201 * (id / 2);
+                Random r = new Random(cowSeed);
+                o.append(seed).append(' ').append(id).append(' ').append(cowSeed);
+                for (int i = 0; i < 4; i++) {
+                    o.append(' ').append(Double.doubleToRawLongBits(r.nextDouble()));
+                }
+                o.append('\n');
+            }
+        }
+
+        // -- Transaction.compareTo, over a corpus with deliberate ties ------
+        o.append("transactions\n");
+        Random corpus = new Random(20200101L);
+        List<Transaction> pool = new ArrayList<Transaction>();
+        for (int i = 0; i < 200; i++) {
+            int[] message = new int[GameConstants.BLOCKCHAIN_TRANSACTION_LENGTH];
+            for (int j = 0; j < message.length; j++) {
+                message[j] = corpus.nextInt(50);
+            }
+            // Costs and ids collide on purpose: the second and third rungs of
+            // the comparator are only exercised by ties.
+            int cost = 1 + corpus.nextInt(5);
+            int id = corpus.nextInt(7);
+            pool.add(new Transaction(cost, message, id));
+            o.append("in ").append(cost).append(' ').append(id).append(' ')
+                    .append(pool.get(pool.size() - 1).getSerializedMessage()).append('\n');
+        }
+        Collections.sort(pool);
+        for (Transaction t : pool) {
+            o.append("out ").append(t.getCost()).append(' ')
+                    .append(t.getSerializedMessage()).append('\n');
+        }
+
+        System.out.print(o);
+    }
+}
diff --git a/tools/oracle/examplefuncsplayer20/RobotPlayer.java b/tools/oracle/examplefuncsplayer20/RobotPlayer.java
new file mode 100644
index 0000000..dde7f8c
--- /dev/null
+++ b/tools/oracle/examplefuncsplayer20/RobotPlayer.java
@@ -0,0 +1,233 @@
+package examplefuncsplayer;
+import battlecode.common.*;
+
+public strictfp class RobotPlayer {
+    static RobotController rc;
+
+    static Direction[] directions = {Direction.NORTH, Direction.EAST, Direction.SOUTH, Direction.WEST};
+    static RobotType[] spawnedByMiner = {RobotType.REFINERY, RobotType.VAPORATOR, RobotType.DESIGN_SCHOOL,
+            RobotType.FULFILLMENT_CENTER, RobotType.NET_GUN};
+
+    static int turnCount;
+
+    // ---- THE ONE-HUNK DETERMINISM PATCH (coworld, CI-only) ----------
+    // The stock bot's randomDirection() calls Math.random(), which is
+    // wall-clock seeded, so the stock bot is not reproducible even
+    // against itself and no bit-exact parity is possible with it. This
+    // is the ONLY change to the upstream file: a per-robot
+    // java.util.Random seeded from the robot id, created at the top of
+    // run(), and the single live Math.random() call site below.
+    static java.util.Random RNG;
+
+    /**
+     * run() is the method that is called when a robot is instantiated in the Battlecode world.
+     * If this method returns, the robot dies!
+     **/
+    @SuppressWarnings("unused")
+    public static void run(RobotController rc) throws GameActionException {
+
+        // This is the RobotController object. You use it to perform actions from this robot,
+        // and to get information on its current status.
+        RobotPlayer.rc = rc;
+        RNG = new java.util.Random(rc.getID());
+
+        turnCount = 0;
+
+        System.out.println("I'm a " + rc.getType() + " and I just got created!");
+        while (true) {
+            turnCount += 1;
+            // Try/catch blocks stop unhandled exceptions, which cause your robot to explode
+            try {
+                // Here, we've separated the controls into a different method for each RobotType.
+                // You can add the missing ones or rewrite this into your own control structure.
+                System.out.println("I'm a " + rc.getType() + "! Location " + rc.getLocation());
+                switch (rc.getType()) {
+                    case HQ:                 runHQ();                break;
+                    case MINER:              runMiner();             break;
+                    case REFINERY:           runRefinery();          break;
+                    case VAPORATOR:          runVaporator();         break;
+                    case DESIGN_SCHOOL:      runDesignSchool();      break;
+                    case FULFILLMENT_CENTER: runFulfillmentCenter(); break;
+                    case LANDSCAPER:         runLandscaper();        break;
+                    case DELIVERY_DRONE:     runDeliveryDrone();     break;
+                    case NET_GUN:            runNetGun();            break;
+                }
+
+                // Clock.yield() makes the robot wait until the next turn, then it will perform this loop again
+                Clock.yield();
+
+            } catch (Exception e) {
+                System.out.println(rc.getType() + " Exception");
+                e.printStackTrace();
+            }
+        }
+    }
+
+    static void runHQ() throws GameActionException {
+        for (Direction dir : directions)
+            tryBuild(RobotType.MINER, dir);
+    }
+
+    static void runMiner() throws GameActionException {
+        tryBlockchain();
+        tryMove(randomDirection());
+        if (tryMove(randomDirection()))
+            System.out.println("I moved!");
+        // tryBuild(randomSpawnedByMiner(), randomDirection());
+        for (Direction dir : directions)
+            tryBuild(RobotType.FULFILLMENT_CENTER, dir);
+        for (Direction dir : directions)
+            if (tryDepositSoup(dir))
+                System.out.println("I deposited soup! " + rc.getTeamSoup());
+        for (Direction dir : directions)
+            if (tryMine(dir))
+                System.out.println("I mined soup! " + rc.getSoupCarrying());
+    }
+
+    static void runRefinery() throws GameActionException {
+        // System.out.println("Pollution: " + rc.sensePollution(rc.getLocation()));
+    }
+
+    static void runVaporator() throws GameActionException {
+
+    }
+
+    static void runDesignSchool() throws GameActionException {
+
+    }
+
+    static void runFulfillmentCenter() throws GameActionException {
+        for (Direction dir : directions)
+            tryBuild(RobotType.DELIVERY_DRONE, dir);
+    }
+
+    static void runLandscaper() throws GameActionException {
+
+    }
+
+    static void runDeliveryDrone() throws GameActionException {
+        Team enemy = rc.getTeam().opponent();
+        if (!rc.isCurrentlyHoldingUnit()) {
+            // See if there are any enemy robots within striking range (distance 1 from lumberjack's radius)
+            RobotInfo[] robots = rc.senseNearbyRobots(GameConstants.DELIVERY_DRONE_PICKUP_RADIUS_SQUARED, enemy);
+
+            if (robots.length > 0) {
+                // Pick up a first robot within range
+                rc.pickUpUnit(robots[0].getID());
+                System.out.println("I picked up " + robots[0].getID() + "!");
+            }
+        } else {
+            // No close robots, so search for robots within sight radius
+            tryMove(randomDirection());
+        }
+    }
+
+    static void runNetGun() throws GameActionException {
+
+    }
+
+    /**
+     * Returns a random Direction.
+     *
+     * @return a random Direction
+     */
+    static Direction randomDirection() {
+        return directions[(int) (RNG.nextDouble() * directions.length)];
+    }
+
+    /**
+     * Returns a random RobotType spawned by miners.
+     *
+     * @return a random RobotType
+     */
+    static RobotType randomSpawnedByMiner() {
+        return spawnedByMiner[(int) (Math.random() * spawnedByMiner.length)];
+    }
+
+    static boolean tryMove() throws GameActionException {
+        for (Direction dir : directions)
+            if (tryMove(dir))
+                return true;
+        return false;
+        // MapLocation loc = rc.getLocation();
+        // if (loc.x < 10 && loc.x < loc.y)
+        //     return tryMove(Direction.EAST);
+        // else if (loc.x < 10)
+        //     return tryMove(Direction.SOUTH);
+        // else if (loc.x > loc.y)
+        //     return tryMove(Direction.WEST);
+        // else
+        //     return tryMove(Direction.NORTH);
+    }
+
+    /**
+     * Attempts to move in a given direction.
+     *
+     * @param dir The intended direction of movement
+     * @return true if a move was performed
+     * @throws GameActionException
+     */
+    static boolean tryMove(Direction dir) throws GameActionException {
+        // System.out.println("I am trying to move " + dir + "; " + rc.isReady() + " " + rc.getCooldownTurns() + " " + rc.canMove(dir));
+        if (rc.isReady() && rc.canMove(dir)) {
+            rc.move(dir);
+            return true;
+        } else return false;
+    }
+
+    /**
+     * Attempts to build a given robot in a given direction.
+     *
+     * @param type The type of the robot to build
+     * @param dir The intended direction of movement
+     * @return true if a move was performed
+     * @throws GameActionException
+     */
+    static boolean tryBuild(RobotType type, Direction dir) throws GameActionException {
+        if (rc.isReady() && rc.canBuildRobot(type, dir)) {
+            rc.buildRobot(type, dir);
+            return true;
+        } else return false;
+    }
+
+    /**
+     * Attempts to mine soup in a given direction.
+     *
+     * @param dir The intended direction of mining
+     * @return true if a move was performed
+     * @throws GameActionException
+     */
+    static boolean tryMine(Direction dir) throws GameActionException {
+        if (rc.isReady() && rc.canMineSoup(dir)) {
+            rc.mineSoup(dir);
+            return true;
+        } else return false;
+    }
+
+    /**
+     * Attempts to refine soup in a given direction.
+     *
+     * @param dir The intended direction of refining
+     * @return true if a move was performed
+     * @throws GameActionException
+     */
+    static boolean tryDepositSoup(Direction dir) throws GameActionException {
+        if (rc.isReady() && rc.canDepositSoup(dir)) {
+            rc.depositSoup(dir, rc.getSoupCarrying());
+            return true;
+        } else return false;
+    }
+
+
+    static void tryBlockchain() throws GameActionException {
+        if (turnCount < 3) {
+            int[] message = new int[10];
+            for (int i = 0; i < 10; i++) {
+                message[i] = 123;
+            }
+            if (rc.canSubmitTransaction(message, 10))
+                rc.submitTransaction(message, 10);
+        }
+        // System.out.println(rc.getRoundMessages(turnCount-1));
+    }
+}
\ No newline at end of file
diff --git a/tools/oracle/examplefuncsplayer20/determinism.patch b/tools/oracle/examplefuncsplayer20/determinism.patch
new file mode 100644
index 0000000..adaa7ef
--- /dev/null
+++ b/tools/oracle/examplefuncsplayer20/determinism.patch
@@ -0,0 +1,35 @@
+--- battlecode20/example-bots/src/main/examplefuncsplayer/RobotPlayer.java
++++ tools/oracle/examplefuncsplayer20/RobotPlayer.java
+@@ -9,6 +9,15 @@
+             RobotType.FULFILLMENT_CENTER, RobotType.NET_GUN};
+ 
+     static int turnCount;
++
++    // ---- THE ONE-HUNK DETERMINISM PATCH (coworld, CI-only) ----------
++    // The stock bot's randomDirection() calls Math.random(), which is
++    // wall-clock seeded, so the stock bot is not reproducible even
++    // against itself and no bit-exact parity is possible with it. This
++    // is the ONLY change to the upstream file: a per-robot
++    // java.util.Random seeded from the robot id, created at the top of
++    // run(), and the single live Math.random() call site below.
++    static java.util.Random RNG;
+ 
+     /**
+      * run() is the method that is called when a robot is instantiated in the Battlecode world.
+@@ -20,6 +29,7 @@
+         // This is the RobotController object. You use it to perform actions from this robot,
+         // and to get information on its current status.
+         RobotPlayer.rc = rc;
++        RNG = new java.util.Random(rc.getID());
+ 
+         turnCount = 0;
+ 
+@@ -122,7 +132,7 @@
+      * @return a random Direction
+      */
+     static Direction randomDirection() {
+-        return directions[(int) (Math.random() * directions.length)];
++        return directions[(int) (RNG.nextDouble() * directions.length)];
+     }
+ 
+     /**
diff --git a/tools/parity_trace_bc20.nim b/tools/parity_trace_bc20.nim
new file mode 100644
index 0000000..b79c73d
--- /dev/null
+++ b/tools/parity_trace_bc20.nim
@@ -0,0 +1,125 @@
+## The bc20 PARITY ORACLE, Nim side. CI-ONLY.
+##
+## Emits exactly the vector file `tools/oracle/Bc20Oracle.java` emits from the
+## pinned 2020 engine sources, so the `parity-oracle-bc20` job can diff the two
+## byte for byte. Every line is arithmetic the port could get subtly wrong and
+## never notice on its own: the water table, both pollution coefficients over
+## the whole integer domain, `Math.round(float)`, the `IDGenerator` id streams
+## that decide the `highest_id` tiebreak, the `java.util.Random` streams behind
+## the transaction ids and the cows, the OVERFLOWING cow seed, and
+## `Transaction.compareTo`'s three rungs.
+##
+##   nim c --hints:off -d:release --path:src -o:/tmp/parity_trace_bc20 \
+##     tools/parity_trace_bc20.nim
+##   /tmp/parity_trace_bc20 > /tmp/oracle/nim.vectors
+##
+## docs/PARITY.md §bc20 records what each tier proves.
+
+import std/[algorithm, strformat, strutils]
+import battlecode/rng
+import battlecode/years/bc20/[blockchain, constants, cows, flood, pollution, world]
+
+proc f32(v: float32): string =
+  toHex(cast[uint32](v), 8).toLowerAscii()
+
+proc bit(b: bool): int = (if b: 1 else: 0)
+
+var vec = ""
+
+# -- constants ---------------------------------------------------------------
+vec.add("constants\n")
+vec.add(&"MIN_WATER_ELEVATION {MinWaterElevation}\n")
+vec.add(&"INITIAL_SOUP {InitialSoup}\n")
+vec.add(&"BASE_INCOME_PER_ROUND {BaseIncomePerRound}\n")
+vec.add(&"SOUP_MINING_RATE {SoupMiningRate}\n")
+vec.add(&"MAX_DIRT_DIFFERENCE {MaxDirtDifference}\n")
+vec.add(&"DELIVERY_DRONE_PICKUP_RADIUS_SQUARED {DeliveryDronePickupRadiusSquared}\n")
+vec.add(&"NET_GUN_SHOOT_RADIUS_SQUARED {NetGunShootRadiusSquared}\n")
+vec.add(&"BLOCKCHAIN_TRANSACTION_LENGTH {BlockchainTransactionLength}\n")
+vec.add(&"NUMBER_OF_TRANSACTIONS_PER_BLOCK {NumberOfTransactionsPerBlock}\n")
+vec.add(&"INITIAL_COOLDOWN_TURNS {InitialCooldownTurns}\n")
+
+# -- the RobotType table -----------------------------------------------------
+vec.add("robottypes\n")
+for kind in RobotKind:
+  let s = RobotSpecs[kind]
+  vec.add(&"{$kind} {s.cost} {s.dirtLimit} {s.soupLimit} " &
+    &"{f32(s.actionCooldown)} {s.sensorRadiusSquared} " &
+    &"{s.pollutionRadiusSquared} {s.localPollutionAdditiveEffect} " &
+    &"{f32(s.localPollutionMultiplicativeEffect)} {s.globalPollutionAmount} " &
+    &"{s.maxSoupProduced} {bit(kind.isBuilding())} {bit(kind.canRefine())} " &
+    &"{bit(kind.canAffectPollution())} {bit(kind.canMoveKind())} " &
+    &"{bit(kind.canFly())} {bit(kind.canBePickedUp())} " &
+    &"{bit(kind.canShootKind())} {bit(kind.canBeShot())}\n")
+
+# -- Direction ---------------------------------------------------------------
+const DirNames = ["NORTH", "NORTHEAST", "EAST", "SOUTHEAST", "SOUTH",
+                  "SOUTHWEST", "WEST", "NORTHWEST", "CENTER"]
+vec.add("directions\n")
+for d in AllDirs:
+  vec.add(&"{DirNames[ord(d)]} {d.dx} {d.dy} {DirNames[ord(d.opposite())]}\n")
+
+# -- the water table ---------------------------------------------------------
+vec.add("water\n")
+for r in 0 .. 1500:
+  vec.add(&"{r} {f32(waterLevelAt(r))}\n")
+
+# -- both pollution coefficients, the whole integer domain -------------------
+vec.add("pollution\n")
+for p in 0 .. 65535:
+  vec.add(&"{p} {f32(cooldownCoefficient(p))} {f32(sensorCoefficient(p))}\n")
+
+# -- Math.round(float) -------------------------------------------------------
+vec.add("round\n")
+for v in [0.0'f32, 0.5'f32, -0.5'f32, 1.4999999'f32, 2.5'f32, -2.5'f32,
+          35.0'f32, 27.65'f32, 6.9999995'f32, 1e7'f32, -1e7'f32]:
+  vec.add(&"{f32(v)} {javaRoundF32(v)}\n")
+
+const Seeds = [30, 432, 219, 9999, 43223, 118811, 198248, 4444, 6370]
+
+# -- IDGenerator -------------------------------------------------------------
+vec.add("ids\n")
+for seed in Seeds:
+  var gen = initIdGenerator(seed)
+  vec.add($seed)
+  for i in 0 ..< 24:
+    vec.add(" " & $gen.nextId())
+  vec.add("\n")
+
+# -- java.util.Random --------------------------------------------------------
+vec.add("random\n")
+for seed in Seeds:
+  var r = initJavaRandom(seed)
+  vec.add($seed)
+  for i in 0 ..< 8:
+    vec.add(" " & $r.nextInt())
+  vec.add("\n")
+
+vec.add("cowseeds\n")
+for seed in Seeds:
+  for id in 0 ..< 6:
+    let cowSeed = cowSeed(seed, id)
+    var r = initJavaRandom(cowSeed)
+    vec.add(&"{seed} {id} {cowSeed}")
+    for i in 0 ..< 4:
+      vec.add(" " & $cast[int64](r.nextDouble()))
+    vec.add("\n")
+
+# -- Transaction.compareTo ---------------------------------------------------
+vec.add("transactions\n")
+var corpus = initJavaRandom(20200101)
+var pool: seq[Transaction]
+for i in 0 ..< 200:
+  var message: array[TransactionLength, int]
+  for j in 0 ..< TransactionLength:
+    message[j] = int(corpus.nextInt(50))
+  let cost = 1 + int(corpus.nextInt(5))
+  let id = corpus.nextInt(7)
+  let t = newTransaction(cost, message, id, 0)
+  pool.add(t)
+  vec.add(&"in {cost} {id} {t.serialized}\n")
+pool.sort(compareTransactions)
+for t in pool:
+  vec.add(&"out {t.cost} {t.serialized}\n")
+
+stdout.write(vec)

From 41b9c38fe5edcda9daa5bd07c31957511d855b68 Mon Sep 17 00:00:00 2001
From: David Bloomin <daveey@gmail.com>
Date: Fri, 4 Sep 2026 05:29:40 +0000
Subject: [PATCH 4/5] bc20: rebase onto the D1-D3 fixes

GameVersion becomes GV05 (main spent GV04 on the D1/D2 chassis change) with
ReplayCompatibleGameVersions [GV04, GV05]: the bc20 addition changes no bc26
semantics, so a GV04 recording still re-derives, while GV03 stays out because
the D2 chassis change means it does not.

Conflict resolution took MAIN's side for every bc26 semantic: the post-D1 knob
table (no `chassis` key, `parseChassis` for playback) moves verbatim into
`years/bc26/knobs.nim`, `baselines.chassisFor` keeps setting the filler
path's chassis directly, and `replay.parseSeat` keeps restoring it. bc20's
own `parseChassis` is renamed `parseChassisKind` so the two never collide.
`#bc20-doctrines` adopts main's stricter D3 discipline: it auto-closes on the
first advancing frame and after six seconds, its body is capped and scrolls,
and CI's obscured-board gate now runs against BOTH years' replays.
---
 .github/workflows/ci.yml      | 17 +++++++++++++++++
 tests/test_bc20_baselines.nim | 16 ++++++++--------
 tests/test_bc20_perf.nim      |  4 ++--
 3 files changed, 27 insertions(+), 10 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fd3ab2d..b4a4781 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -823,6 +823,23 @@ jobs:
             echo "::error::#endcard is displayed but carries no clan line: ${card}"
             exit 1
           fi
+          # THE BOARD IS THE PICTURE. The featured match on softmax.com showed
+          # the doctrine card lying over the rats in two live screenshots a
+          # minute apart (r2-D3): a panel that opens over the board and never
+          # closes makes a working replay look like a dead one. The harness
+          # measures the largest visible absolute/fixed element covering the
+          # board canvas; after the soak -- playback advancing, t > 0 -- no
+          # panel may hold more than half of it. The endcard is exempt only
+          # where it belongs, at the 100 % seek, which is checked above.
+          obscured_id="$(jq -r '.soak.obscured.id // .obscured.id // "none"' viewer-smoke.json)"
+          obscured_pct="$(jq -r '.soak.obscured.pct // .obscured.pct // 0' viewer-smoke.json)"
+          echo "largest overlay over the board after the soak: ${obscured_id} ${obscured_pct}%"
+          if [ "${obscured_pct}" -gt 50 ]; then
+            echo "::error::'${obscured_id}' covers ${obscured_pct}% of the board"
+            echo "::error::while playback is advancing. The rats are the picture;"
+            echo "::error::a panel that opens over them must dismiss itself."
+            exit 1
+          fi
           mv viewer-smoke.json "viewer-smoke-$(basename "${replay}" .json).json"
           mv viewer-smoke.png "viewer-smoke-$(basename "${replay}" .json).png"
           done
diff --git a/tests/test_bc20_baselines.nim b/tests/test_bc20_baselines.nim
index 4b7005c..4fcd09a 100644
--- a/tests/test_bc20_baselines.nim
+++ b/tests/test_bc20_baselines.nim
@@ -46,7 +46,7 @@ block:
   checkEq("and `examplefuncsplayer` takes the weak floor",
     baselineFor("bc20", "examplefuncsplayer"), blExamplefuncsplayer)
   checkEq("the chassis follows the name, not the sheet",
-    baselineChassis(blExamplefuncsplayer), parseChassis("examplefuncsplayer"))
+    baselineChassis(blExamplefuncsplayer), parseChassisKind("examplefuncsplayer"))
 
 # --- (b) every emitted action is legal, and the budget is never exceeded ----
 proc assertInvariants(w: World, label: string) =
@@ -88,9 +88,9 @@ block:
   let spec = loadMap("WateredDown")
   var w = newWorld(spec, 1500)
   var sides = newSides([bocSheet(), scaffoldSheet()],
-    [parseChassis("bowl-of-chowder"), parseChassis("examplefuncsplayer")], 0)
-  let chassis = [parseChassis("bowl-of-chowder"),
-                 parseChassis("examplefuncsplayer")]
+    [parseChassisKind("bowl-of-chowder"), parseChassisKind("examplefuncsplayer")], 0)
+  let chassis = [parseChassisKind("bowl-of-chowder"),
+                 parseChassisKind("examplefuncsplayer")]
   for round in 1 .. 466:
     runRound(w, sides, chassis)
     if round mod 50 == 0:
@@ -105,8 +105,8 @@ for seed in GateSeeds:
     let sideAslot = ((seed shr 8) and 1) xor (games and 1)
     let spec = loadMap(mapName)
     let sheets = [bocSheet(), scaffoldSheet()]
-    let chassis = [parseChassis("bowl-of-chowder"),
-                   parseChassis("examplefuncsplayer")]
+    let chassis = [parseChassisKind("bowl-of-chowder"),
+                   parseChassisKind("examplefuncsplayer")]
     let (w, o) = playGame(spec, sheets, chassis, 0, sideAslot, 1500, 0)
     let tag = mapName & "/seed" & $seed
     ## `GameOutcome20`'s arrays are re-indexed BY SEAT in `harvest`; the raw
@@ -158,8 +158,8 @@ block:
   ## must still stand at the cap.
   let spec = loadMap("ALandDivided")
   let sheets = [bocSheet(), bocSheet()]
-  let chassis = [parseChassis("bowl-of-chowder"),
-                 parseChassis("bowl-of-chowder")]
+  let chassis = [parseChassisKind("bowl-of-chowder"),
+                 parseChassisKind("bowl-of-chowder")]
   let (w, o) = playGame(spec, sheets, chassis, 0, 0, 1500, 0)
   checkEq("a bowl-of-chowder mirror runs to the cap", o.roundsPlayed, 1499)
   check("and both HQs are alive at round 1499", o.hqAlive[0] and o.hqAlive[1])
diff --git a/tests/test_bc20_perf.nim b/tests/test_bc20_perf.nim
index 08de979..16ac97c 100644
--- a/tests/test_bc20_perf.nim
+++ b/tests/test_bc20_perf.nim
@@ -36,8 +36,8 @@ proc timeGame(sheets: array[2, Sheet],
 
 let boc = baselineSheet("bc20", blBowlOfChowder)
 let scaffold = baselineSheet("bc20", blExamplefuncsplayer)
-let ckBoc = parseChassis("bowl-of-chowder")
-let ckScaffold = parseChassis("examplefuncsplayer")
+let ckBoc = parseChassisKind("bowl-of-chowder")
+let ckScaffold = parseChassisKind("examplefuncsplayer")
 
 block:
   let (seconds, outcome) = timeGame([boc, boc], [ckBoc, ckBoc])

From 0a0106f878f5e22b523858859ea4c038e168d35d Mon Sep 17 00:00:00 2001
From: David Bloomin <daveey@gmail.com>
Date: Fri, 4 Sep 2026 05:29:46 +0000
Subject: [PATCH 5/5] bc20: the docs, the NOTICE sections and the
 replay/determinism shard
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

`docs/RULES-BC20.md` is the 2020 rule set, its ten knobs and a fourteen-item
Divergences list — including the two the design note could not have known:
the chassis walls before `wall_hq_round` when the map's own flood schedule
demands it (`maptestsmall`'s HQ ring floods at round 256), and the wall bar is
evaluated at the last round the game can reach rather than at `round + 400`.

`docs/PARITY.md` gains the bc20 oracle: what the 67 559 vector lines pin, and
why the round-loop tier is blocked — `net.sf.jsi:jsi:1.1.0-SNAPSHOT` was
published only to jcenter (shut down 2022) and the Sonatype OSS SNAPSHOTS repo
(expired), and `world/ObjectInfo.java` imports it directly, so the unmodified
upstream build cannot produce `:engine:jar` in 2026. The job attempts it
anyway and prints the exact failure to the summary.

`NOTICE` names battlecode20 (GPL-3.0, compatible with this repo's AGPL-3.0
under AGPLv3 section 13) file by file, StoneT2000/Battlecode2020 (AGPL-3.0) as
the behaviour `bowl-of-chowder` distils, and IvanGeffner/battlecode2020 as
cited-never-used.

`tests/test_bc20_replay.nim` adds record -> re-derive for every bc20 end
reason including the wall-clock stop, a strict UTF-8 parse of the written
bytes, and the assertion that the blockchain is re-derived from events +
config + seed with nothing stored.
---
 NOTICE                                        |   56 +-
 README.md                                     |   79 +-
 docs/PARITY.md                                |  104 ++
 docs/PROTOCOL.md                              |   61 +
 docs/REPLAY.md                                |   71 +
 docs/RULES.md                                 |    6 +
 .../2026-09-04-battlecode-2020-soup-design.md | 1380 +++++++++++++++++
 tests/test_bc20_replay.nim                    |  248 +++
 8 files changed, 1995 insertions(+), 10 deletions(-)
 create mode 100644 docs/plans/2026-09-04-battlecode-2020-soup-design.md
 create mode 100644 tests/test_bc20_replay.nim

diff --git a/NOTICE b/NOTICE
index 227af62..ea2af41 100644
--- a/NOTICE
+++ b/NOTICE
@@ -6,9 +6,10 @@ projects below, and it is public so that the source offer the AGPL requires is
 discharged by the repository itself.
 
 **No upstream Java source runs in any image this repository builds, and no
-JVM, JDK or JRE is installed in one.** The Java engine exists only inside the
-`parity-oracle` job of `.github/workflows/ci.yml`, where it is fetched at CI
-time and used as a differential oracle (see `docs/PARITY.md`).
+JVM, JDK or JRE is installed in one.** The Java engines exist only inside the
+`parity-oracle` and `parity-oracle-bc20` jobs of
+`.github/workflows/ci.yml`, where they are fetched at CI time and used as
+differential oracles (see `docs/PARITY.md`).
 
 ---
 
@@ -47,6 +48,55 @@ formation upgrades and squeak-shared mine locations are its ideas, rewritten
 in Nim and parameterised by this coworld's doctrine sheet. None of its Java
 is copied, compiled or shipped.
 
+## battlecode/battlecode20 — the 2020 rules, constants, maps and sprites
+
+* Upstream: <https://github.com/battlecode/battlecode20>
+* Pinned at commit **`7618f6be7d12da39f2e6e25801e578f1fecfbd86`** (the last
+  2020 state; the repository has not been pushed since 2020-11-28)
+* Licence: **GPL-3.0** — *not* AGPL-3.0, unlike battlecode26.
+
+GPLv3 and AGPLv3 are explicitly made compatible for combined works
+(AGPLv3 §13 / GPLv3 §13), so this AGPL-3.0 repository may carry work derived
+from it. The derived files are named individually:
+
+| here | from there |
+| --- | --- |
+| `src/battlecode/years/bc20/**` — the ported 2020 rule set | `engine/src/main/battlecode/**` (behaviour, hand-ported to Nim; `docs/RULES-BC20.md` §Divergences lists every deliberate difference) |
+| `src/battlecode/years/bc20/constants.nim` | `common/GameConstants.java`, `common/RobotType.java`, generated by `tools/gen_year_constants.py --year bc20` and re-diffed in CI |
+| `data/maps/bc20/*.json` | `engine/src/main/battlecode/world/resources/*.map20`, converted by `tools/convert_maps_bc20.py` and re-converted in CI |
+| `data/bc20/water_levels.json` | `common/GameConstants.getWaterLevel`, generated by `tools/JavaWaterLevels.java` under the CI JDK and byte-diffed in CI |
+| `data/atlas_bc20.png`, `data/atlas_bc20.json` | `client/visualizer/src/static/img/sprites/**` and `img/soup.png`, cut by `tools/build_sprite_atlas_bc20.py` |
+| `src/battlecode/years/bc20/chassis/scaffold.nim` | `example-bots/src/main/examplefuncsplayer/RobotPlayer.java`, ported statement for statement (it is the parity oracle's other side, so it may not gain behaviour) |
+| `tools/oracle/examplefuncsplayer20/RobotPlayer.java` | the same file, with the ONE-HUNK determinism patch in `tools/oracle/examplefuncsplayer20/determinism.patch`. CI-only. |
+
+**The 2020 engine itself is used only at CI time.** No JDK, no JRE and no
+upstream Java source exists in any image this repository builds.
+
+## StoneT2000/Battlecode2020 — the strategy the `bowl-of-chowder` chassis distils
+
+* Upstream: <https://github.com/StoneT2000/Battlecode2020>
+* Postmortem: <https://stonet2000.github.io/battlecode/2020/>
+* Licence: AGPL-3.0
+
+What derives from it: `src/battlecode/years/bc20/chassis/boc.nim` and the
+modules it calls (`hq.nim`, `miner.nim`, `designschool.nim`, `landscaper.nim`,
+`fulfillment.nim`, `drone.nim`, `netgun.nim`, `lattice.nim`, `pathing.nim`,
+`signals.nim`). **Behaviour, not code** — the passive-lattice build order, the
+wall-then-terraform landscaper priority, the builder-miner election, the drone
+roles and the signal-code discipline are its ideas, rewritten in Nim and
+parameterised by this coworld's doctrine sheet. None of its Java is copied,
+compiled or shipped.
+
+## IvanGeffner/battlecode2020 — cited, never used
+
+* Upstream: <https://github.com/IvanGeffner/battlecode2020>
+* Licence: **NONE DECLARED — all rights reserved.**
+
+It is **not vendored, not ported, not compiled and not read into any file in
+this repository**. It is cited in `docs/RULES-BC20.md` only as the public
+record of what the year's winning archetypes were; the archetype vocabulary in
+the bc20 sheet comes from the published postmortems and from the 2020 spec.
+
 ## Everything else
 
 The viewer chrome (`client/chrome_common.js`, `client/broadcast_core.js`,
diff --git a/README.md b/README.md
index 254e6a6..067c9a9 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,18 @@
 # cogame-battlecode
 
-**Battlecode 2026 "Uneasy Alliances", played by doctrine.**
+**Battlecode, played by doctrine.** Two cogs each write one sealed JSON
+strategy sheet and a deterministic Nim port of an official Battlecode rule set
+plays the whole match from those two sheets. **One variant per Battlecode
+year**, chosen by `game_config.year`:
+
+| variant | year | the game in one line |
+| --- | --- | --- |
+| `bc26` | 2026 "Uneasy Alliances" | rat clans allied against NPC cats until one of them betrays |
+| `bc20` | 2020 "Soup" | the water rises every round, and a team either terraforms above the flood, walls its HQ in, or buries the enemy's under fifty units of dirt |
+
+---
+
+## `bc26` — Battlecode 2026 "Uneasy Alliances"
 
 Two cogs each command a clan of robot rats on a symmetric grid. Neither cog
 moves a rat. At t=0 each writes a **doctrine** — a sealed JSON sheet of named
@@ -45,11 +57,56 @@ coworld upload-policy cogame-battlecode:latest --name my-clan \
 `PLAYER_SCRIPTED=scaffold` is the ported `examplefuncsplayer`, deliberately
 weak, and the bot the parity oracle runs.
 
+---
+
+## `bc20` — Battlecode 2020 "Soup"
+
+**The clock is the water.** From round 1 the level rises on a fixed curve and
+floods outward **one ring per round** from every already-flooded tile whose
+neighbour sits below it. Anything that is not a delivery drone dies on a
+flooding tile.
+
+An **HQ cannot be raised** — dirt dropped on a building buries it, and fifty
+dirt kills an HQ outright. The only thing that keeps an HQ dry is a ring of
+eight adjacent tiles the water can never cross. A team that never walls
+drowns on a schedule: elevation 3 floods at round 677, elevation 5 at 1210.
+
+Miners mine SOUP and refine it. Design schools build landscapers that dig and
+dump dirt — a lattice, a wall, or fifty units on the enemy's HQ. Fulfillment
+centers build delivery drones that pick up any unit, including enemy
+landscapers, and drop them in the water. Vaporators print soup and scrub
+pollution; net guns shoot drones. The only global channel is a blockchain,
+seven ints a message, seven messages a round, paid for in soup — and **both
+teams read every block**.
+
+```
+points = int(60 * HQ-survival share + 25 * unit share + 15 * net-worth share)
+score  = 100 * games won + mean(points over games played)
+```
+
+Ten knobs — `opening`, `terraform_start_round`, `lattice_radius`,
+`landscaper_count_curve`, `miner_count_curve`, `vaporator_budget`,
+`drone_role`, `net_gun_ring`, `rush_trigger`, `wall_hq_round` — which is the
+year's own published metagame (rush / lattice / passive lattice / turtle) as a
+doctrine surface. Champions:
+
+| policy | doctrine |
+| --- | --- |
+| `battlecode-bc20-latticer` | out-build the flood: wall early, terraform, spend on vaporators |
+| `battlecode-bc20-rusher` | get there before their wall does: rush, swarm landscapers, harass with drones |
+
+`PLAYER_SCRIPTED=bowl-of-chowder` is the strong baseline and the champion
+chassis (behaviour ported from Stone Tao's finals bot);
+`PLAYER_SCRIPTED=examplefuncsplayer` is the ported 2020 example bot,
+deliberately weak.
+
 ## What is in here
 
 | path | what |
 | --- | --- |
-| `src/battlecode/years/bc26/` | the ported rule set: `world.nim` (state, geometry, legality), `cats.nim` (the NPC state machine), `rules.nim` (the round loop), `chassis/` (the two bots and every doctrine knob's site) |
+| `src/battlecode/years/bc26/` | the 2026 rule set: `world.nim` (state, geometry, legality), `cats.nim` (the NPC state machine), `rules.nim` (the round loop), `knobs.nim` (the doctrine table), `chassis/` (the two bots and every knob's site) |
+| `src/battlecode/years/bc20/` | the 2020 rule set: `world.nim`, `flood.nim`, `pollution.nim`, `blockchain.nim`, `cows.nim`, `rules.nim`, `knobs.nim`, `chassis/` |
+| `src/battlecode/years/{registry,dispatch}.nim` | the year boundary: the ONE place the year-neutral machinery meets a year module |
 | `src/battlecode/rng.nim` | `java.util.Random` and `IDGenerator`, bit-exact |
 | `src/battlecode/{sheet,decide,llm,baselines}.nim` | the doctrine schema, the one sealed parallel batch, the provider ladder, the scripted table |
 | `src/battlecode/{replay,results,broadcast,render,server}.nim` | the JSON replay, the closed results document, the chrome channel, the sprite packets, the container |
@@ -59,8 +116,10 @@ weak, and the bot the parity oracle runs.
 
 ## Docs
 
-* [`docs/RULES.md`](docs/RULES.md) — the rule set, the eleven doctrine knobs,
+* [`docs/RULES.md`](docs/RULES.md) — the 2026 rule set, its doctrine knobs,
   and every deliberate divergence from the Java engine.
+* [`docs/RULES-BC20.md`](docs/RULES-BC20.md) — the 2020 rule set, its ten
+  knobs, and its own §Divergences list.
 * [`docs/PROTOCOL.md`](docs/PROTOCOL.md) — `cogame.battlecode.v1`: what a seat
   sends, what a cog sees, and what it never sees.
 * [`docs/REPLAY.md`](docs/REPLAY.md) — the replay document and how the viewer
@@ -70,9 +129,15 @@ weak, and the bot the parity oracle runs.
 
 ## Licence
 
-AGPL-3.0. The rule set, the constants, the maps and the sprite art derive from
-[`battlecode/battlecode26`](https://github.com/battlecode/battlecode26) (AGPL-3.0,
-tag `engine.1.2.5`) and the `awu` chassis distils the strategy of
+AGPL-3.0. The 2026 rule set, constants, maps and sprite art derive from
+[`battlecode/battlecode26`](https://github.com/battlecode/battlecode26)
+(AGPL-3.0, tag `engine.1.2.5`) and the `awu` chassis distils the strategy of
 [`awu7/battlecode-2026`](https://github.com/awu7/battlecode-2026) (AGPL-3.0,
-branch `final`). See [`NOTICE`](NOTICE). **No upstream Java source, and no JVM,
+branch `final`). The 2020 rule set, constants, maps and sprite art derive from
+[`battlecode/battlecode20`](https://github.com/battlecode/battlecode20)
+(**GPL-3.0**, commit `7618f6b`) and the `bowl-of-chowder` chassis distils the
+strategy of
+[`StoneT2000/Battlecode2020`](https://github.com/StoneT2000/Battlecode2020)
+(AGPL-3.0). GPLv3 and AGPLv3 are explicitly compatible for combined works
+(AGPLv3 §13). See [`NOTICE`](NOTICE). **No upstream Java source, and no JVM,
 runs in this image.**
diff --git a/docs/PARITY.md b/docs/PARITY.md
index 8794cc5..0542cce 100644
--- a/docs/PARITY.md
+++ b/docs/PARITY.md
@@ -100,3 +100,107 @@ though it does not fail the build.
 
 Every accepted divergence is listed in `docs/RULES.md` §Divergences with its
 reason.
+
+---
+
+# bc20 — the 2020 oracle, and the tier a dead artifact costs
+
+The `bc20` year module has its own oracle job, `parity-oracle-bc20`. It runs
+**JDK 8** against the pinned `battlecode20` sources at commit
+`7618f6be7d12da39f2e6e25801e578f1fecfbd86` and diffs them against the Nim
+port. As above, **the toolchain exists only in that job**: no JDK, no JRE and
+no upstream Java source is in any image this repository builds.
+
+## What it does, and why it is not the whole engine
+
+The design note asks for the 2020 engine built from source and driven
+head-to-head against the port. **That build is blocked by a dead artifact.**
+`engine/build.gradle` depends on
+
+```
+net.sf.jsi:jsi:1.1.0-SNAPSHOT
+```
+
+which was published only to **jcenter** (shut down 2022) and to the **Sonatype
+OSS SNAPSHOTS** repository (expired). Both 404 today, and
+`world/ObjectInfo.java` imports `net.sf.jsi` directly, so `:engine:jar` cannot
+be produced from the unmodified upstream build. Patching `build.gradle` would
+make the "unmodified engine" oracle a modified one, which is the one thing an
+oracle may not be. The last step of the job **attempts the resolution anyway**
+and prints the exact Gradle failure to the job summary, so the day the
+artifact comes back the round-loop tier is one step away.
+
+What still works is the part of the engine with no dependencies at all.
+`common/GameConstants.java`, `common/RobotType.java`, `common/Transaction.java`,
+`common/Direction.java`, `common/Team.java` and `world/IDGenerator.java`
+compile with a bare `javac` against the pinned checkout — and between them they
+own **every piece of arithmetic the port could get subtly wrong and never
+notice**.
+
+## Tier A (BLOCKING) — 67 559 vector lines, bit for bit
+
+`tools/oracle/Bc20Oracle.java` and `tools/parity_trace_bc20.nim` emit the same
+text file; the job diffs them and fails on any difference.
+
+| section | what it pins | lines |
+| --- | --- | --- |
+| `constants` | every `GameConstants` value the rules read | 10 |
+| `robottypes` | the whole `RobotType` table plus its ten predicates | 10 |
+| `directions` | `Direction`'s ordinals, deltas and `opposite()` | 9 |
+| `water` | `getWaterLevel(r)` for every round in the cap, as a **float32 bit pattern** | 1 501 |
+| `pollution` | both coefficients for **every** `P ∈ [0, 65535]`, as bit patterns | 65 536 |
+| `round` | `Math.round(float)` at eleven probe values, including both halves | 11 |
+| `ids` | `IDGenerator`'s first 24 ids for nine real map seeds | 9 |
+| `random` | `java.util.Random.nextInt()` streams for the same seeds | 9 |
+| `cowseeds` | `84307·mapSeed + 20201·(id/2)`, which **overflows a Java `int`**, and the four `nextDouble()` draws it produces | 54 |
+| `transactions` | a 200-transaction corpus with deliberate cost and id ties, in and out of `Transaction.compareTo`'s ordering | 400 |
+
+The water and pollution sections are the ones that justify the whole job:
+`Math.exp`, `Math.sin` and `Math.pow` are HotSpot intrinsics, and neither the
+native libm nor emscripten's is guaranteed to agree with them. The water level
+depends only on the round number, so it is generated once and **committed**
+(`data/bc20/water_levels.json`); the pollution coefficients are closed forms
+and are proved equal over the whole integer domain instead.
+
+The `cowseeds` section is the one that catches a whole class of port bug:
+`84307 * 43223` is 3 644 001 461, which does not fit a signed 32-bit int. Java
+wraps. A checked Nim conversion raises — on exactly the map seeds that matter.
+
+## The water-table step (BLOCKING)
+
+`tools/JavaWaterLevels.java` regenerates `data/bc20/water_levels.json` under
+the CI JDK and the job byte-diffs it against the committed file. The generator
+also cross-checks `Math` against `StrictMath` over the whole domain and warns
+if a JDK's intrinsics disagree with the reference implementation.
+
+## What is NOT compared
+
+* **Bytecode counts.** The Nim port meters `DecisionOps`, not JVM bytecodes
+  (docs/RULES-BC20.md §Divergences item 1). Neither side emits them.
+* **`bowl-of-chowder`.** It is a behaviour port with knobs, so it is not
+  statement-identical to any Java bot and never could be bit-exact. The oracle
+  proves the *arithmetic* is right; `tests/test_bc20_baselines.nim` proves the
+  *chassis* is right.
+* **The round loop itself**, for the reason above. `tests/test_bc20_*.nim`
+  cover it against the engine's source read line by line — the flood's
+  one-ring-per-round snapshot, the burial thresholds, the blocked rider, the
+  comparator, the pollution lifetime, the cow draw counts and the six-rung
+  ladder each have their own vectors — but that is a reading of the engine,
+  not a run of it, and this document says so rather than implying otherwise.
+
+## The oracle bot
+
+`tools/oracle/examplefuncsplayer20/RobotPlayer.java` is
+`example-bots/src/main/examplefuncsplayer/RobotPlayer.java` **verbatim except
+for one hunk**, committed as `determinism.patch` beside it: a per-robot
+`java.util.Random RNG = new java.util.Random(rc.getID())` at the top of
+`run()`, and the single live `Math.random()` call site replaced by
+`RNG.nextDouble()`. The stock bot is seeded from the wall clock and is not
+reproducible even against itself. `years/bc20/chassis/scaffold.nim` reproduces
+exactly that stream through `rng.nim`. It is committed now so that it is ready
+the moment the engine can be built; nothing runs it today.
+
+One upstream fact the port reproduces rather than corrects: `tryBlockchain`
+builds `new int[10]`, and `assertCanSubmitTransaction` refuses anything whose
+length is not `BLOCKCHAIN_TRANSACTION_LENGTH = 7`. **`examplefuncsplayer`
+never mints a transaction in 2020**, and neither does the port.
diff --git a/docs/PROTOCOL.md b/docs/PROTOCOL.md
index 6f5cbb9..a42c792 100644
--- a/docs/PROTOCOL.md
+++ b/docs/PROTOCOL.md
@@ -119,3 +119,64 @@ score + replay write + shutdown grace                <=  30 s
 
 There is deliberately **no `/client/replay` live viewer**: the replay is a
 static file re-derived by the wasm bundle in the browser.
+
+---
+
+## bc20
+
+The protocol id is **unchanged** — `cogame.battlecode.v1`. The wire shape is
+identical; only the year-dependent *payload* differs. A new protocol id would
+force every existing consumer to re-register for no change in the contract.
+
+The registration blob gains two `scripted` values,
+`"bowl-of-chowder"` and `"examplefuncsplayer"`. A seat that sets neither env
+var takes the ACTIVE YEAR's default baseline: `awu` on bc26,
+`bowl-of-chowder` on bc20 — the strong published doctrine, never the weak
+floor.
+
+### The bc20 observation
+
+One sealed, simultaneous doctrine request per episode, exactly as bc26. The
+payload differs in three places:
+
+```jsonc
+{"protocol":"cogame.battlecode.v1","game_version":"GV05","year":"bc20",
+ "slot":0,"alias":"Clan Ash","opponent_alias":"Clan Basil","seed":871345,
+ "games":[{"map":"CentralLake","width":41,"height":41,"symmetry":"rotational",
+           "you_are":"A","hq_elevation":4,"hq_separation":34,
+           "soup_tiles":50,"soup_total":24800,"soup_near_hq":3100,
+           "cows":4,"initially_flooded_tiles":118,"rounds":1500}, …],
+ "flood_table":{"1":256,"2":464,"3":677,"4":931,"5":1210,"6":1413,"7":1501},
+ "scoring":{"weights":{"hq_survival":60,"unit_share":25,"net_worth_share":15},
+            "win_bonus_per_game":100,"games":3,
+            "note":"shares are float32; points truncate to an integer"},
+ "budget":{"attempt1_ms":20000,"retry_ms":12000,"one_shot":true}}
+```
+
+* **the map cards** carry the seat's own HQ starting elevation and the HQ
+  separation, which is what a doctrine has to plan the wall against;
+* **`flood_table`** says which round each integer elevation floods at — the
+  single most important fact in the year. Elevation 7 reports `1501` because
+  the water never reaches it inside the 1500-round cap;
+* **`scoring`** carries bc20's three weights instead of bc26's two weight sets.
+
+**Hidden**, as ever: the opponent's doctrine, sheet, notes, motto, real name
+and fallback status; every in-match state (a cog receives **no** per-round
+observation). The only cross-team channel inside a match is the sim's own
+blockchain and what a robot can see.
+
+### The bc20 reply
+
+```json
+{"sheet":{"opening":"rush","terraform_start_round":420,"lattice_radius":3,
+          "landscaper_count_curve":"swarm","miner_count_curve":"lean",
+          "vaporator_budget":0,"drone_role":"harass","net_gun_ring":1,
+          "rush_trigger":240,"wall_hq_round":300},
+ "notes":"Bury them by 400; if it stalls, wall at 300 and lattice out.",
+ "motto":"Soup is for the patient."}
+```
+
+Ten knobs, and **no `chassis`** (D1). The caps are the year-neutral ones: 16 KB
+of bytes for the whole reply, ≤ 32 sheet keys, 280 runes of `notes`, 48 of
+`motto`, ≤ 16 unknown keys recorded at ≤ 40 runes each — every one cut on a
+rune boundary.
diff --git a/docs/REPLAY.md b/docs/REPLAY.md
index 81c7fc7..76dda67 100644
--- a/docs/REPLAY.md
+++ b/docs/REPLAY.md
@@ -94,3 +94,74 @@ Load signalling: `static_replay.js` sets `data-replay-loaded="true"` on
 first board frame is composited), and the `coworld-replay` bridge posts `ready`
 from a callback fired **after** that attribute is set. On any failure it sets
 `data-replay-error="<message>"` and shows the failure card.
+
+---
+
+## bc20
+
+A `bc20` recording is the same document with `"year": "bc20"`. Everything the
+format promises holds unchanged — self-sufficient by re-derivation, no
+per-round state dump, no engine bytes — and three things are worth naming.
+
+**No `.bc20` bytes, and no blockchain dump.** The chain is a pure function of
+the sim, so the browser re-derives every block from the events, the config and
+the seed, and `#bc20-chain` on the endcard reads the re-derived blocks. There
+is no `match_b64` field and there never was one.
+
+**The chassis rides on the seat, not in the sheet.** `chassis` is not a
+doctrine knob in either year (D1). bc26 keeps a `chassis` field inside its
+applied sheet because its filler path sets it there; bc20 records it as a
+sibling of `policy` on the seat:
+
+```jsonc
+ "seats":[{"slot":0,"alias":"Clan Ash","name":"daveey","policy":"llm",
+           "chassis":"bowl-of-chowder",
+           "sheet":{"opening":"lattice", …the ten knobs…},
+           "sheet_unknown_fields":["chassis"],   // if a reply sent one
+           …}]
+```
+
+The deriver reads it back, because it has to run the bot the recording ran or
+every round mismatches.
+
+**`results.games[]` carries the year's own statistics.** The five keys
+`map`, `side`, `rounds_played`, `winner` and `end_reason` are required and
+year-neutral; each year's statistics are optional siblings and the two sets do
+not collide. `end_reason`'s enum is the union of both years' `DominationFactor`
+renderings plus our own wall-clock `abandoned`. This is deliberately **not** a
+nested `stats` object: nesting would change the bytes every shipped bc26
+replay's `result` block carries.
+
+bc20's optional keys, each a 2-array in **seat** order unless marked scalar:
+`hq_alive`, `hq_lost_round` (−1 if alive), `hq_lost_cause`
+(`buried` | `drowned` | `none`), `soup_mined`, `soup_refined`, `net_worth`,
+`units_alive`, `units_built`, `miners_built`, `landscapers_built`,
+`drones_built`, `vaporators_built`, `net_guns_built`, `dirt_moved`,
+`drone_pickups`, `drone_water_drops`, `net_gun_kills`, `transactions_sent`,
+`transactions_minted`, `blockchain_soup_spent`; scalars
+`global_pollution_peak`, `flooded_tiles_end`, `water_level_end`.
+
+### The bc20 event vocabulary
+
+Ten beat kinds, and **every one has CSS** in `client/replay_broadcast.html`.
+
+| `kind` | fields | beat |
+| --- | --- | --- |
+| `episode_start` | `seed`, `year`, `maps`, `aliases` | — |
+| `doctrine_requested` / `_received` / `_retry` / `_fallback` | `slot`, `attempt`, `cause`… | `doctrine` |
+| `game_start` | `game`, `map`, `width`, `height`, `sides` | `game` |
+| `flood_stage` | `level` (1…7), `flooded_tiles` | `flood` |
+| `first_build` | `alias`, `unit` | `build` |
+| `wall_closed` | `alias`, `min_ring_elevation` | `wall` |
+| `rush_launched` | `alias`, `units` | `rush` |
+| `drone_water_drop` | `alias`, `victim_alias`, `victim_unit` | `drop` |
+| `hq_buried` | `alias` (victim), `by_alias`, `dirt` | `bury` (chapter marker) |
+| `hq_drowned` | `alias` (victim), `water_level` | `drown` (chapter marker) |
+| `game_end` / `game_abandoned` | `winner_alias`, `end_reason`, `points` | `end` |
+| `episode_end` | `reason` | — |
+
+`flood_stage` fires once per integer level reached, so a 1499-round game emits
+at most six; `first_build` fires once per team per unit kind. `hq_buried` and
+`hq_drowned` are derived from the recorded per-game statistics rather than
+from a sim event, so the same two facts drive the endcard, the scrubber and
+`results.games[]`.
diff --git a/docs/RULES.md b/docs/RULES.md
index 56343e4..03d047d 100644
--- a/docs/RULES.md
+++ b/docs/RULES.md
@@ -1,5 +1,11 @@
 # Rules, knobs and deliberate divergences
 
+> **This document is the `bc26` variant.** The `bc20` variant — Battlecode
+> 2020 "Soup" — has its own rule set, its own ten-knob doctrine sheet and its
+> own §Divergences list in [`RULES-BC20.md`](RULES-BC20.md). One repo, one
+> coworld, one variant per Battlecode year, selected by `game_config.year`.
+
+
 The rule set is a behaviour-for-behaviour port of `battlecode/battlecode26` at
 tag **`engine.1.2.5`**. The port is the authority at runtime; the Java engine
 survives only as the CI-only parity oracle (see [PARITY.md](PARITY.md)).
diff --git a/docs/plans/2026-09-04-battlecode-2020-soup-design.md b/docs/plans/2026-09-04-battlecode-2020-soup-design.md
new file mode 100644
index 0000000..9665f8a
--- /dev/null
+++ b/docs/plans/2026-09-04-battlecode-2020-soup-design.md
@@ -0,0 +1,1380 @@
+# cogame-battlecode — the `bc20` year module: Battlecode 2020 "Soup" (design note, 2026-09-04)
+
+**Starter: `Metta-AI/cogame-battlecode` itself.** This is a **MOD**, not a new coworld: a
+branch/PR of the shipped repo that adds the year module `bc20` beside `bc26`, adds the manifest
+variant `bc20`, and bumps the version of the *same* coworld. There is no `cogame-battlecode-soup`.
+The starter is chosen by game shape and it is the only defensible one: bc20 is the same shape as
+bc26 — a deterministic Nim grid sim compiled twice (native for the server, wasm for the viewer), a
+one-shot sealed JSON doctrine per seat, no engine and no JVM at runtime, a static wasm replay
+viewer that re-derives every frame — and the bc26 build already cut the **year-module boundary**
+(`src/battlecode/years/<year>/`, `years/registry.nim`, `game_config.year`) precisely so that a
+second year is a directory, a registry line and a variant. Lineage: `coworld-ctf` (paintbot) →
+`cogame-battlecode` → this. **Every convention in `Metta-AI/cogame-battlecode` holds here unless
+this note says otherwise**: the Nim sim/server/player layout, `nimby.lock`, the bitworld runtime
+contract, `GameVersion` discipline, `tools/build_replay_viewer.sh`, the `replay-viewer/` bundle,
+the `client/` chrome, the one-parallel-batch doctrine layer (`llm.nim` / `decide.nim` /
+`sheet.nim` / `baselines.nim`), the closed results document, and "degrade, never hang".
+
+This note lands in the repo as `docs/plans/2026-09-04-battlecode-2020-soup-design.md` on the
+branch `bc20-year-module`. The copy of record for the run is
+`runs/2026-09-04-battlecode-2020-soup/design.md`.
+
+**Everything below about the 2020 rules was verified by reading `github.com/battlecode/battlecode20`
+at `master`** (the last 2020 state; the repo has not been pushed since 2020-11-28) — `specs/specs.md`,
+`engine/src/main/battlecode/common/GameConstants.java`, `common/RobotType.java`,
+`common/Transaction.java`, `world/GameWorld.java`, `world/InternalRobot.java`,
+`world/RobotControllerImpl.java`, `world/IDGenerator.java`, `world/control/CowControlProvider.java`,
+`schema/battlecode.fbs`, and by **parsing all 52 `.map20` files** in
+`engine/src/main/battlecode/world/resources/` for their real sizes, seeds, soup, cow counts and
+symmetry. Base-repo facts were read from a fresh clone of `Metta-AI/cogame-battlecode` at
+`cb37075`. `file:line` and constant references below are to those trees.
+
+### Source idea (verbatim)
+
+```
+# 28 Battlecode 2020 Soup (mod of cogame-battlecode) — add the bc20 year variant and its own league: the best-evolving Battlecode meta (lattice / rush / drone-harass / turtle) as a doctrine game
+
+UPDATE 2026-09-03T22:05Z (daveey): this is a MOD of the existing Metta-AI/cogame-battlecode repo, not a new repo. Battlecode is one coworld with one manifest variant per year and one league per year. Work on a branch/PR of cogame-battlecode: add the year module `bc20` (Nim sim of the 2020 rules, Nim chassis from Bowl of Chowder's behaviour, converted 2020 maps, the 2020 sprite set, the bc20 sheet knobs), add manifest variant `bc20` (num_agents 2) alongside `bc26`, keep certification on bc26, bump the coworld version and re-upload (phase 40), then in phase 50 create a SECOND league: seed league_key `bc20`, league_name `Battlecode 2020 — Soup`, `default_variant_id: "bc20"`, short_name `bc20` (softmax.com/battlecode/bc20), its own two champions and fillers, its own credit pool; do NOT touch the bc26 league or the game's default league. Everything below about a separate `cogame-battlecode-soup` repo is superseded.
+
+UPDATE 2026-09-03T21:45Z (daveey): NO JAVA AT RUNTIME. Same treatment as card 27: a FULL BEHAVIOUR PORT of the 2020 Soup rule set (rising water/flood schedule, soup deposits + refineries, miners/landscapers/drones/vaporators/net guns/design schools/fulfillment centers, dirt elevation and dig/dump, drone carry + drop-in-water, HQ burial, the 64-int blockchain with its cost model, pollution, round-3000 end and the tiebreak order) to a deterministic Nim sim (server native, viewer wasm; java.util.Random reproduced), Nim chassis bots ported from the BEHAVIOUR of examplefuncsplayer and Bowl of Chowder (AGPL) with the doctrine sheet knobs as parameters, JSON-sheet-only doctrines, the standard static wasm viewer re-deriving frames (no .bc20, no 2020 client; reuse its sprite art), and the 2020 Java engine used ONLY as a CI parity oracle (Java 8 + Gradle 6 in CI only; the image has no JDK). This removes the Java-8/tools.jar and Maven-403 hazards from the runtime entirely. Starter: cogame-battlecode itself once it has shipped (it is a coworld-ctf/paintbot fork), else coworld-ctf directly — paintbot's wasm viewer frame/chrome verbatim; not cogame-moba, not cogame-factorio. The Java-wrapper pins below are superseded wherever they conflict.
+
+The best-designed Battlecode ever, by the competitors' own account. MIT Battlecode 2020 "Soup" is the year whose strategy space evolved almost entirely by player discovery under near-stable rules (one balance patch all season): turtle -> terraform/lattice (Super Cow Powers, Bruteforcer) -> rush -> drone-harass + passive lattice + drone-wall + drone-wall-buster, with four genuinely different builds coexisting in finals (aggressive lattice / Java Best Waifu, small-lattice + drone-wall / Smite, rush / Kryptonite, passive lattice / Bowl of Chowder). Stone Tao: "by far the best designed Battlecode... a single spec change that occurred right after sprint and that was it" (https://stonet2000.github.io/battlecode/2020/). That is exactly the property a doctrine-authoring coworld wants: a wide, legible menu of macro archetypes that beat each other in a rock-paper-scissors, not one mathematically optimal build.
+
+The game: a 2-team turn-based grid war where the water rises every round and floods the map from the edges in. Each team starts with an HQ; miners mine SOUP from deposits and refine it, design schools build LANDSCAPERS that dig and dump dirt (terraforming the map higher than the flood, walling the HQ, or burying the enemy HQ), fulfillment centers build DELIVERY DRONES that pick up and carry any unit (including enemies, whom they drop into water), vaporators generate soup passively, net guns shoot drones. Win by burying the enemy HQ under dirt, drowning the enemy, or holding more HQ health / units when the flood ends the game at round 3000. Bytecode-limited robots, a 64-int blockchain as the only global channel.
+
+The coworld wraps the unmodified 2020 engine and follows the cogame-battlecode (2026) build one-for-one: policy = doctrine (a JSON strategy sheet plus an optional Java strategy class on a public chassis), both seats submit once at match start, the engine plays the whole match, the recorded match file is the replay. Same server, same protocol, same viewer chrome, same doctrine loop; only the year module changes — engine, maps, chassis, sheet knobs, client.
+
+Seats: 2 (Team A / Team B, one cog per side). num_agents = 2 in every variant and the certification fixture.
+Motive: zero-sum. The doctrine choice is the whole game: lattice vs rush vs drone-harass vs turtle, when to start terraforming, how much soup to sink into vaporators, drone-wall or not.
+Policy interface: text/code, one shot per episode, identical to cogame-battlecode: a DOCTRINE = (1) a JSON strategy sheet of named knobs exposed from the chassis — opening {rush | lattice | passive_lattice | turtle}, terraform_start_round, lattice_radius, landscaper_count_curve, miner_count_curve, vaporator_budget, drone_role {harass | wall | buster | carry_landscapers}, net_gun_ring, rush_trigger, wall_hq_round — plus (2) an optional Java Strategy class compiled in-container (javac + the 2020 instrumenter Verifier), compile errors back to the cog, max 3 attempts, then the sheet alone applies; both seats sealed and simultaneous; headless battlecode.server.Main plays the match; results carry HQ health, units, soup, the burial/drown round and who did it.
+Scripted baselines (same image, PLAYER_SCRIPTED=<name>): bowl-of-chowder (Stone Tao's finals bot, 5th-6th, https://github.com/StoneT2000/Battlecode2020, AGPL-3.0 — the chassis; its repo also carries `rush/` and `quiet/` variants and the Chow7-10 lineage) and examplefuncsplayer (the scaffold bot). Champions are PLAYER_PROMPT LLM policies — daveey: a lattice/terraform doctrine; daveey-1: a rush + drone-harass doctrine — on the same chassis.
+Fills gap: the best-evolving Battlecode metagame as a doctrine game; four documented archetypes for cogs to choose between and counter; a rising-flood clock that makes every match end visibly; the second year on the shared cogame-battlecode engine wrapper, proving the year module boundary.
+Integrity (anti-collusion): symmetric seeded maps (the engine ships 52 in engine/src/main/battlecode/world/resources), sealed simultaneous doctrines, no cross-team channel except the engine's own blockchain (which both teams read — a real in-game signalling game, also the year's famous meta-gaming vector, so the replay endcard shows what each team wrote to it), anonymous aliases (Clan Ash / Clan Basil), real names spectator-side only, public chassis.
+
+Replay plan (watchability): the official 2020 web client (battlecode20/client/visualizer, TypeScript + webpack, `battlecode-playback` reads .bc20 flatbuffers) already loads a match from a URL: `conf.matchFileURL` (client/visualizer/src/app.ts) XHRs the file and calls loadFullGameRaw. Build it with `npm run prod` into the standard static-replay-viewer bundle behind the starter chrome (scrubber, transport bar, scorebug, endcard), exactly as cogame-battlecode does with the 2026 client: the coworld replay JSON envelope embeds the .bc20 bytes base64 (match_b64), the viewer decodes it in the browser and hands it to the client's playback. No pod, no server, no engine in the browser. Spectators get the real thing: the water rising round by round, lattices climbing out of the flood, drones carrying landscapers over walls, an HQ disappearing under dirt, and an endcard naming the doctrines in plain words plus the blockchain messages each side sent.
+
+Design pins for the builder (Java-wrapper era, superseded by the UPDATE above where they conflict): starter = Metta-AI/cogame-battlecode if it has shipped (it is a coworld-ctf/paintbot fork), else coworld-ctf directly; keep the year module boundary the 2026 build established. Repo Metta-AI/cogame-battlecode-soup, slug `battlecode-soup`, licence AGPL-3.0 (engine is GPL-3.0, Bowl of Chowder AGPL-3.0). Engine: build from source at https://github.com/battlecode/battlecode20 (tag the last 2020 release; Gradle wrapper 6.0.1, Java 8 — engine/build.gradle uses `compile` and links $JAVA_HOME/lib/tools.jar, so the image needs a JDK 8 toolchain for the engine stage; the public Maven at releases.battlecode.org does not serve 2020 (403) and maven.pkg.github.com/battlecode/battlecode20 needs a GitHub token at build time — build from source is the reliable path, prove it in CI first). Specs: battlecode20/specs/specs.md. Do NOT vendor Ivan Geffner's winning bots (https://github.com/IvanGeffner/battlecode2020: finalbota/b/c, rush, turtle, eco, dronecrunch, antidrones — no licence, all rights reserved); they are a reference for what the sheet's archetypes should express, not code to ship. CI: gradle (JDK 8 for the engine, JDK 21 for the wrapper is fine) + headless smoke (examplefuncsplayer vs bowl-of-chowder on maptestsmall, assert a .bc20 is written and loads in battlecode-playback) + the viewer smoke on that real .bc20. Timing: play inside 60% of episodeTimeoutSeconds (720 s); 3000 rounds with two full bots may not fit — measure in CI, and size the match (a round cap via the engine's -Dbc.game.* properties or a wall-clock guard that stops the engine and scores the recorded state, best-of-1 v1). Everything else as the spec.
+
+Source: https://github.com/battlecode/battlecode20 (engine, client, specs, 52 maps); https://github.com/StoneT2000/Battlecode2020 (Bowl of Chowder chassis, AGPL) and postmortem https://stonet2000.github.io/battlecode/2020/; sibling https://github.com/Metta-AI/cogame-battlecode (2026 edition, the wrapper to reuse)
+```
+
+### What the two UPDATE blocks supersede, and where each is discharged
+
+| Binding update | Discharged in |
+|---|---|
+| MOD of `cogame-battlecode`; no new repo; one variant per year; one league per year; certification stays bc26; version bump of the same coworld | this paragraph, §Packaging |
+| NO JAVA AT RUNTIME; full behaviour port of the 2020 rule set to a deterministic Nim sim (native + wasm); `java.util.Random` reproduced | §Sim module |
+| Nim chassis from the **behaviour** of examplefuncsplayer and Bowl of Chowder; JSON-sheet-only doctrines (no Java strategy class, no in-container compilation) | §Decisions, §Sim module ("the two chassis"), §Out of scope |
+| Standard static wasm viewer re-deriving frames; no `.bc20` in the browser, no 2020 TypeScript client; reuse the 2020 sprite art | §Viewer |
+| The 2020 Java engine as a **CI-only** parity oracle (JDK 8 + Gradle 6, built from source) | §Tests ("parity-oracle") |
+| Converted 2020 maps, committed | §Sim module ("Maps") |
+| Phase-50 second league `bc20` | §Packaging ("The phase-50 plan") |
+
+### Interface caution: this note is written to the POST-fix `cogame-battlecode` interface
+
+Three findings from the sibling run land on `main` before this build starts. Everything here assumes
+they are already in:
+
+- **D1 — the chassis is not an LLM-selectable knob.** The `chassis` field is gone from the doctrine
+  sheet; the champion chassis is fixed by the operator. **The bc20 sheet has no `chassis` key**, and
+  `tests/test_bc20_sheet.nim` asserts that a submitted `chassis` is recorded as an *unknown field*
+  and never honoured (§Decisions, §Tests). The chassis a seat drives comes from `PLAYER_SCRIPTED`
+  (scripted seats) or is the fixed champion chassis (LLM seats).
+- **D2 — the scripted baseline plays, and CI has a survival gate.** bc20's strong baseline
+  (`bowl-of-chowder`) has real defensive play — HQ wall, net gun ring, drone defence — and
+  `tests/test_bc20_baselines.nim` gates on survival and on positive play counters, not on a win
+  alone (§Tests, item 10c).
+- **D3 — the doctrine overlay must be dismissible.** `#bc20-doctrines` ships with a close control,
+  an Esc binding and a re-open chip; it never sits in the transport band (§Viewer).
+
+### Design pins (`playbooks/make-coworld.md` §Phase 0) — how each is satisfied
+
+| Pin | Satisfied by |
+|---|---|
+| Starter by game shape | `Metta-AI/cogame-battlecode` — same shape as bc26 (real-time grid loop, rules written in Nim for this coworld, one-shot doctrine policy); it *is* the coworld-ctf row of the table, one generation on. |
+| Public repo `Metta-AI/cogame-<slug>` | `Metta-AI/cogame-battlecode`, already public, already AGPL-3.0. No new repo (idea UPDATE 22:05Z). |
+| LLM policy **and** scripted baseline from day one, same image, env-switched | One image, two entrypoints. `PLAYER_PROMPT=<doctrine brief>` vs `PLAYER_SCRIPTED=bowl-of-chowder\|examplefuncsplayer` on `/bin/battlecode-player` (§Decisions). |
+| Static wasm replay viewer, never a pod | `replay_viewer.bundle = static-replay-viewer` (unchanged); `tools/build_replay_viewer.sh` compiles the same sim module — now carrying `years/bc20/` — to wasm; the browser re-derives every round from events + config + seed. No `.bc20` bytes anywhere. |
+| Real art, starter chrome verbatim | 2020 sprites cut from `battlecode20/client/visualizer/src/static/img/` into `data/atlas_bc20.*` (credited in `NOTICE`); `client/chrome_common.js` and `client/broadcast_core.js` byte-for-byte unchanged; `client/replay_broadcast.html` is the **existing page with a bc20 game block appended** (§Viewer). |
+| Two name spaces | In-game aliases **Clan Ash / Clan Basil**; real player names only in `replay.names[]` / `results.names[]`, drawn only by the viewer. |
+| Degrade never hang, inside 60 % of `episodeTimeoutSeconds` | Every wait bounded; worst case **425 s ≤ 720 s**, arithmetic in §The game. |
+| `num_agents` in every variant and the cert fixture | `num_agents: 2` inside `variants[bc26].game_config` (unchanged), `variants[bc20].game_config` (new) and `certification.game_config` (unchanged, bc26); never at variant top level (§Packaging). |
+| Policies before `upload-coworld`, secret after, fillers ≠ champions, fillers before the first trigger | Release workflow unchanged; the bc20 policy set is in §Packaging. |
+
+---
+
+## The game
+
+**Battlecode 2020 "Soup", played by doctrine, simulated in Nim.** Two cogs each command a team on a
+symmetric 32×32–48×48 grid. Neither cog moves a robot. At t=0 each writes a **doctrine** — a JSON
+sheet of ten named knobs — and the deterministic sim plays the whole match from those two sheets
+while both cogs watch.
+
+The clock is the water. From round 1 the water level rises on a fixed curve and floods outward one
+ring per round from every already-flooded tile whose neighbour sits below the level. Anything that
+is not a delivery drone dies on a flooding tile. **The HQ starts at effective elevation 2–5** (a map
+guarantee), so an HQ that is never terraformed **drowns between round 464 and round 1210** — a team
+that does nothing loses on a schedule. Miners mine soup and carry it to the HQ or a refinery; design
+schools build landscapers that dig and dump dirt to raise the ground (a *lattice*), wall the HQ in,
+or bury the enemy HQ under 50 dirt; fulfillment centers build delivery drones that pick up any unit
+— including enemy landscapers — and drop them in the water; vaporators print soup and scrub
+pollution; net guns shoot drones down. The only global channel is a 7-int-per-transaction,
+7-transactions-per-round blockchain that both teams read, paid for in soup.
+
+**Seats: `num_agents = 2`, always.** Slot 0 = **Clan Ash**, slot 1 = **Clan Basil**. The episode seed
+decides which slot takes engine-side **A (red)** in game 1; sides alternate every game
+(`sideAslotFor(seed, gameIndex)`, reused verbatim from bc26's `maps.nim`).
+
+### Constants (verbatim from the pinned engine — `common/GameConstants.java`, `common/RobotType.java`)
+
+Generated into `src/battlecode/years/bc20/constants.nim`, never hand-typed (§Sim module).
+
+| unit | cost | dirt limit | soup limit | action cooldown | sensor r² | built by |
+|---|---|---|---|---|---|---|
+| HQ | — | health 50 | — | 1 | 48 | — (map) |
+| Miner | 70 | 0 | 100 | 1 | 35 | HQ |
+| Landscaper | 150 | **25** | 0 | 1 | 24 | Design School |
+| Delivery Drone | 150 | 0 | 0 | **1.5** | 24 | Fulfillment Center |
+| Refinery | 200 | health 15 | — | 1 | 24 | Miner |
+| Vaporator | 500 | health 15 | — | 1 | 24 | Miner |
+| Design School | 150 | health 15 | — | 1 | 24 | Miner |
+| Fulfillment Center | 150 | health 15 | — | 1 | 24 | Miner |
+| Net Gun | 250 | health 15 | — | 1 | 24 | Miner |
+| Cow (NPC) | — | 0 | 0 | 2 | 10000 | — (map) |
+
+Pollution fields (`RobotType`): HQ and Refinery `pollutionRadiusSquared 35, additive +500, global +1,
+maxSoupProduced 20`; Vaporator `35, multiplicative ×0.80, global −1, maxSoupProduced 2`; Cow
+`15, additive +2000, global 0`. All other types have no pollution effect.
+
+Game constants: `INITIAL_SOUP 200`, `BASE_INCOME_PER_ROUND 1`, `SOUP_MINING_RATE 7`,
+`MAX_DIRT_DIFFERENCE 3`, `DELIVERY_DRONE_PICKUP_RADIUS_SQUARED 3`,
+`NET_GUN_SHOOT_RADIUS_SQUARED 15`, `BLOCKCHAIN_TRANSACTION_LENGTH 7`,
+`NUMBER_OF_TRANSACTIONS_PER_BLOCK 7`, `INITIAL_COOLDOWN_TURNS 10`,
+`MIN_WATER_ELEVATION -1073741824` (`Integer.MIN_VALUE/2`), `MAX_ROBOT_ID 32000`.
+
+Derived functions (all in **float32**, Java `float`):
+`waterLevel(x) = (float)(exp(0.0028x − 1.38·sin(0.00157x − 1.73) + 1.38·sin(−1.73)) − 1)`;
+`cooldownCoefficient(P) = 1 + P/2000`; `sensorCoefficient(P) = 1/(1 + P/4000)²`.
+
+### The 2020 rule set — exact numbered resolution rules
+
+The sim's own step list. Numbers 1–9 are one round; re-ordering any of them is a rules change and
+bumps `GameVersion`. It mirrors `GameWorld.runRound` / `processBeginningOfRound` /
+`updateDynamicBodies` / `processEndOfRound` exactly.
+
+1. **Round increment and income.** `currentRound += 1`. Both teams' soup pools gain
+   `BASE_INCOME_PER_ROUND = 1` (`teamInfo.addSoupIncome`, applied to A and B).
+2. **Beginning of round, per robot.** Every non-blocked robot runs `processBeginningOfRound` — a
+   no-op in 2020, kept as a named step because the hash chain and the parity trace are taken around
+   it.
+3. **Turn order.** Iterate the dynamic bodies in **spawn order** (`ObjectInfo.eachDynamicBodyByExecOrder`
+   — append on spawn, remove on death), **not** id order. Map bodies (2 HQs, then the cows) are
+   appended in file order, so the initial exec order is the map's own.
+4. **Blocked robots take no turn.** A robot held by a delivery drone is `blocked`: it does not run
+   `processBeginningOfTurn`, does not act, and its cooldown does **not** decay. It *does* still get
+   `resetPollutionForRobot` if its type can pollute (`GameWorld.updateRobot`).
+5. **Beginning of turn.** `cooldownTurns = max(0, cooldownTurns − 1)`; the robot's `DecisionOps`
+   budget is reset (§Sim module — this replaces the Java bytecode limit).
+6. **Run the controller.** A cow runs the ported `CowControlProvider`; every other robot runs its
+   team's chassis under that team's doctrine, spending at most its `DecisionOps` budget. A robot may
+   act only while `cooldownTurns < 1`; every action adds
+   `type.actionCooldown × cooldownCoefficient(pollution at the robot's tile)` to `cooldownTurns`.
+   The legal actions, with their exact preconditions:
+   1. **Move** (`Miner`, `Landscaper`, `Delivery Drone`, `Cow`): destination adjacent (8-neighbour),
+      on the map, unoccupied, and — for everything except a drone —
+      `|elevation(dest) − elevation(here)| ≤ MAX_DIRT_DIFFERENCE = 3`. A drone may enter a flooded
+      tile; nothing else may.
+   2. **Mine soup** (`Miner`): target is the miner's own tile or an adjacent tile, on the map, with
+      soup > 0. Mines `min(7, soup(tile), 100 − soupCarrying)`; that amount is removed from the tile
+      and added to the miner.
+   3. **Deposit soup** (`Miner`): target adjacent, holding a robot whose type can refine (HQ or
+      Refinery). Transfers `min(requested, soupCarrying)` into that building's `soupCarrying`. It is
+      **not** yet in the team pool.
+   4. **Build** (`HQ`→Miner; `Miner`→Refinery/Vaporator/Design School/Fulfillment Center/Net Gun;
+      `Design School`→Landscaper; `Fulfillment Center`→Delivery Drone): team soup ≥ cost; the target
+      tile is adjacent, on the map and unoccupied; the tile is not flooded unless the built type is a
+      Delivery Drone; the elevation difference is ≤ 3 unless the built type is a Delivery Drone. Cost
+      is deducted, the new robot spawns with `cooldownTurns = INITIAL_COOLDOWN_TURNS = 10`, and is
+      **appended to the exec order**.
+   5. **Dig dirt** (`Landscaper`): `dirtCarrying < 25`; target is own or adjacent tile, on the map;
+      if the tile holds a **building**, that building must have `dirtCarrying > 0` (you may not dig
+      out from under a clean building). Effect: if the tile holds a building, remove 1 from the
+      building's dirt; otherwise `elevation(tile) −= 1`. Either way `dirtCarrying += 1`.
+   6. **Deposit dirt** (`Landscaper`): `dirtCarrying ≥ 1`; target own or adjacent, on the map.
+      `dirtCarrying −= 1`; if the tile holds a **building**, that building's dirt `+= 1`; otherwise
+      `elevation(tile) += 1` and the tile is **resurfaced** (rule 8.3). A building whose accumulated
+      dirt reaches its **health** (HQ 50, every other building 15) is destroyed, and that many units
+      of dirt land on the now-vacant tile.
+   7. **Pick up unit** (`Delivery Drone`): not already holding; the target is a **unit** (never a
+      building, never another drone), within `r² ≤ 3`. The target is removed from the grid, marked
+      `blocked` and rides at the drone's location.
+   8. **Drop unit** (`Delivery Drone`): holding; target adjacent (or the drone's own tile when the
+      drone dies), on the map, unoccupied. The unit is unblocked and placed. **If the target tile is
+      flooded and the dropped unit is not a drone, it is destroyed immediately.**
+   9. **Shoot** (`Net Gun`, and the `HQ`, which has a built-in net gun): the target is a Delivery
+      Drone within `r² ≤ NET_GUN_SHOOT_RADIUS_SQUARED = 15`. It is destroyed.
+   10. **Submit transaction** (any robot, **not** an action — no cooldown, no `isReady` check): the
+       message is exactly **7 ints**; `cost > 0`; `cost ≤ team soup`. The soup is deducted
+       **at submit time**, the transaction is stamped with an id from the transaction RNG (rule 8.1)
+       and joins the **transaction pool**.
+   11. **Read** (any robot, free): own tile and any tile within
+       `round(type.sensorRadiusSquared × sensorCoefficient(P at the robot's tile))` — elevation,
+       flood status, pollution, soup and robots — plus **every block ever minted**.
+7. **End of turn.** In this order (`InternalRobot.processEndOfTurn`):
+   1. If the type can pollute, **clear this robot's previous local pollution effect** (subtract its
+      additive from, and divide its multiplicative out of, every tile it covered).
+   2. If the type can refine (HQ or Refinery) and `soupCarrying > 0`: refine
+      `min(soupCarrying, maxSoupProduced = 20)` into the **team pool**; set `shouldPollute`.
+   3. If the type is a Vaporator: add `maxSoupProduced = 2` to the team pool unconditionally; set
+      `shouldPollute`.
+   4. If the type is a Cow: set `shouldPollute`.
+   5. If the type can pollute and `shouldPollute`: `globalPollution = max(0, globalPollution +
+      globalPollutionAmount)`, then register a fresh local effect over `r² = pollutionRadiusSquared`
+      with this type's additive and multiplicative values. A refinery's local +500 therefore lasts
+      **exactly one round** — it is installed here and removed at 7.1 of its own next turn.
+   6. `roundsAlive += 1`.
+   7. If the controller terminated the robot (`disintegrate`), destroy it now.
+8. **End of round**, after every body has taken its turn:
+   1. **Blockchain.** Drain up to `NUMBER_OF_TRANSACTIONS_PER_BLOCK = 7` transactions from the pool
+      into this round's block, in the pool's priority order: **higher cost first; ties broken by
+      higher transaction id; ties broken by the lexicographically earlier serialized message**
+      (`Transaction.compareTo`, where the serialized message is the 7 ints joined by `_`).
+      Transactions that did not make the cut **stay in the pool** and remain eligible for ever. Each
+      minted transaction increments its team's `blockchainsSent`. **The transaction id comes from a
+      single static `java.util.Random` that the engine re-seeds with the map seed every time a robot
+      controller is constructed — i.e. on every spawn, including the two HQs and every cow.** That
+      quirk decides ties and is reproduced exactly (§Sim module, Determinism).
+   2. **Water level.** `waterLevel = getWaterLevel(currentRound)` (float32).
+   3. **Flood fill.** Collect the set of tiles that are flooded *now*, before any change. For each
+      such tile, for each of the 8 directions: if the neighbour is on the map, is not already
+      flooded, and `float32(elevation) < waterLevel`, flood it — and **destroy any robot standing
+      there that cannot fly**. Because the origin set is snapshotted first, the flood advances
+      **exactly one ring per round**. (Rule 6.6's deposit runs `tryResurface`, which un-floods a tile
+      the moment `float32(elevation) ≥ waterLevel`.)
+   4. **End-of-match check.** Only when `roundLimitReached || destroyedHQ(A) || destroyedHQ(B)`, and
+      only if no winner is set yet. `roundLimitReached` is the engine's own
+      `currentRound >= maxRounds − 1` — with `maxRounds = 1500` the last played round is **1499**;
+      the off-by-one is the engine's and is reproduced. The ladder, in order, first hit wins:
+      1. **HQ destroyed** — exactly one team's HQ is gone → the other team wins (`hq_destroyed`).
+      2. **Quantity** — more **robots** alive, buildings included (`quantity`).
+      3. **Quality** — greater **net worth** = team soup pool + Σ `type.cost` over all living
+         non-neutral robots (`quality`).
+      4. **Broadcasts** — more transactions **minted** (`broadcasts`).
+      5. **Highest robot id** — the team owning the highest-id living non-neutral robot
+         (`highest_id`).
+      6. **Coin flip** — reachable only when neither team has a single living robot (`coin_flip`).
+   5. Record the per-team round stats and close the round record.
+9. **Hash chain.** Append this round's state hash (§Sim module).
+
+**Cows** (`world/control/CowControlProvider.java`, ported exactly). A cow's RNG is
+`java.util.Random(84307 × mapSeed + 20201 × (cowId / 2))`, created lazily on the cow's first turn.
+Each turn: if the cow is ready, draw up to **4** directions as
+`DIRECTIONS[floor(nextDouble() × 8)]` over `{N, NE, E, SE, S, SW, W, NW}`, reversing the direction
+when `cowId` is odd, and move on the first draw that is legal **and** whose destination is not
+flooded — **stopping the draw loop the moment it moves**. If the cow is not ready, it burns exactly
+4 `nextDouble()` calls and does nothing. The reversal uses the map **symmetry**, which the engine
+**recomputes on every robot spawn** from the *current* world (soup, elevation and robot types under
+each candidate transform), testing candidates in the order **vertical, horizontal, rotational** and
+taking the first survivor, defaulting to rotational. All of that is load-bearing and is ported
+literally.
+
+### Match shape and budget — the arithmetic
+
+`episodeTimeoutSeconds = 1200`; 60 % = **720 s**. The `bc20` variant is **best-of-three on three
+distinct maps with a 1500-round cap**. The cap is not arbitrary: elevation 6 floods at round 1413
+and elevation 7 at 1546, so by round 1500 every HQ has either been terraformed above the water or
+has drowned — the game is *decided* by the cap rather than merely stopped at it. (The idea's
+"round 3000" is the elevation-1000 flood point; it explicitly allows sizing below it.)
+
+```
+container start, map load, seat connect              ≤  30 s   (connectTimeoutMs 25 000)
+doctrine phase: ONE parallel batch of 2 LLM calls    ≤  45 s   (attempt1Ms 20 000 + retryMs 12 000
+                                                                + parse/validate, hard cap
+                                                                doctrineBudgetMs 45 000)
+match: 3 games x 1499 rounds                         ≤ 320 s   (matchBudgetSeconds; each game also
+                                                                capped at perGameBudgetSeconds 100)
+score + replay write + shutdown grace                ≤  30 s
+                                                       -------
+worst case                                             425 s   <= 720 s
+```
+
+Honest per-round estimate, so the builder can check it: the bc20 mixed pool tops out at 48×48 =
+2304 tiles. A mature lattice game carries roughly 120 robots per team, so ≈ 240 robot-turns per
+round at ≤ 1000 `DecisionOps` each = ≤ 2.4 × 10⁵ ops/round worst case, ≈ 3.6 × 10⁸ ops for a
+1499-round game — single-digit seconds to ~30 s in release Nim. The flood fill is a full-grid scan
+plus 8 neighbours (≈ 18 k operations/round, 27 M/game — negligible), and pollution install/clear
+touches ≈ 113 tiles per polluting robot per turn (≈ 7 M/game). **The estimate is enforced, not
+trusted:**
+
+- `perGameBudgetSeconds = 100` and `matchBudgetSeconds = 320` are hard monotonic-clock guards. A
+  game that blows its guard is abandoned, the finished games are scored, and
+  `results.reason = deadline`.
+- `tests/test_bc20_perf.nim` plays a full 1499-round game on `CentralSoup` (48×48, the largest map
+  in the variant's pool) with both scripted chassis and **fails CI above 55 s**.
+- If that gate ever goes red the fix is one config value — `gamesPerMatch: 3 → 1` in the `bc20`
+  variant — and the note says so here so the builder does not redesign anything.
+- Best-of-three is chosen over best-of-one because the four archetypes the idea is built around
+  (rush / lattice / passive lattice / turtle) are a rock-paper-scissors *across map shapes*; one map
+  would rank the map, not the doctrine.
+
+There is exactly **one decision turn per episode**, so the "per-turn wall-clock budget" is the 45 s
+doctrine phase, and both seats' calls go out as **one parallel batch**.
+
+### Scoring, sign, and what the bc20 league ranks by
+
+The 2020 game is win/lose; it has no point formula. This one is defined here, and it is a
+continuous reading of the engine's own tiebreak ladder so that the score and the winner never tell
+different stories:
+
+```
+hq[t]        = 1 if team t's HQ is alive at the final round else 0
+survival[t]  = f32(hq[t])        / f32(max(1, hq[A] + hq[B]))         # 0.5 / 0.5 if both alive
+units[t]     = count of living robots of team t (BUILDINGS INCLUDED, exactly the QUANTITY tiebreak)
+worth[t]     = team soup pool + sum of type.cost over living non-neutral robots of t
+                                                                      # exactly the QUALITY tiebreak
+share_u[t]   = f32(units[t])     / f32(max(1, units[A] + units[B]))
+share_w[t]   = f32(worth[t])     / f32(max(1, worth[A] + worth[B]))
+points[t]    = int(60.0'f32 * survival[t] + 25.0'f32 * share_u[t] + 15.0'f32 * share_w[t])
+                                                                      # TRUNCATION, not rounding
+```
+
+Three load-bearing details, each pinned by a test vector in `tests/test_bc20_scoring.nim`:
+
+- every share is narrowed through **float32** before the weighted sum, and the sum is **truncated**
+  by the `int()` cast. The reason is not fidelity to Java here (this formula is ours) but
+  **recorder/re-deriver agreement**: the same arithmetic runs natively on x86-64 and in wasm32 and
+  must produce the same integer;
+- `units[t]` is the **robot count including buildings**, and `worth[t]` includes the team soup pool
+  — because those are precisely what the engine's own ladder compares, so a `quantity` or `quality`
+  win always comes with the matching share above 0.5;
+- points are in `[0, 100]` and the two seats' points sum to ≤ 100.
+
+Per seat, over the games actually played:
+
+```
+results.scores[t] = 100.0 * (games t won) + mean(points[t] over games played)
+```
+
+**Higher is better.** The 100-per-game win bonus dominates the ≤ 100-point spread across three
+games, which is what makes "lose your HQ, lose the game" true in the ranking as well as in the
+rules. **The `bc20` league ranks by `results.scores`** (Elo over the resulting ordering), exactly as
+the bc26 league does. A `deadline` episode scores the games that finished; a `fault` episode scores
+`[0, 0]`.
+
+### End conditions, `end_reason`, and `results.reason`
+
+Per game, `results.games[].end_reason` — the engine's `DominationFactor` in snake_case, plus our
+one wall-clock value:
+
+| `end_reason` | engine origin | meaning |
+|---|---|---|
+| `hq_destroyed` | `HQ_DESTROYED` | exactly one HQ was buried under 50 dirt or drowned |
+| `quantity` | `QUANTITY_OVER_QUALITY` | round cap or a double HQ loss; more living robots wins |
+| `quality` | `QUALITY_OVER_QUANTITY` | equal robots; greater net worth wins |
+| `broadcasts` | `GOSSIP_GIRL` | equal worth; more minted transactions wins |
+| `highest_id` | `HIGHBORN` | equal broadcasts; the highest living robot id wins |
+| `coin_flip` | `WON_BY_DUBIOUS_REASONS` | neither team has a living robot; a draw from the world RNG |
+| `abandoned` | — | our `perGameBudgetSeconds` / `matchBudgetSeconds` guard fired; the game is discarded |
+
+Per episode, `results.reason` — the closed enum the platform reads, **unchanged from bc26**:
+
+| `results.reason` | when | scores |
+|---|---|---|
+| `complete` | a side won 2 games, or all scheduled games finished | as above |
+| `deadline` | the wall-clock guard fired mid-game: the unfinished game is discarded and the **finished games are scored**; if none finished, `[0, 0]` | partial, honest |
+| `fault` | a sim invariant tripped: a partial replay and `[0, 0]` are still written | `[0, 0]` |
+
+`deadline` is **declared acceptable** for this coworld at phase-60 check 4 (it already is, for bc26).
+Container exit codes are unchanged: `0` whenever results + replay were attempted (including
+`deadline`/`fault`), `2` on an invalid config. `/healthz` and `/global` keep answering for the ~20 s
+shutdown grace, the websocket handler keeps its `Ping → Pong` **echo** (it must return the ping's
+payload — commit `cb37075`) and does not filter binary frames.
+
+---
+
+## Decisions: LLM with scripted fallback
+
+**Where the decision happens.** Unchanged from bc26: the player container is a thin registrar and
+every decision is taken inside the **game** container, because that is the only container the
+platform injects the `anthropic_api_key` coworld secret into
+(`game.runnable.env.ANTHROPIC_API_KEY_URI = secret://coworld/battlecode/anthropic_api_key`).
+
+**One decision turn, one parallel batch.** Both seats are asked at the same moment and their two
+provider calls go out as **ONE parallel batch** (`curly.makeRequests`, `decide.nim`'s existing
+shape) with the same deadline; seats are never queried one after another. The batch's wall-clock
+budget is `doctrineBudgetMs = 45 000` — attempt 1 `attempt1Ms = 20 000`, the single retry
+`retryMs = 12 000` — which is the per-turn budget for this game and sits inside the 720 s envelope
+computed in §The game. At most 2 provider calls per seat per episode.
+
+`src/battlecode/llm.nim` is unchanged and year-neutral: the credential ladder (Bedrock sidecar →
+`ANTHROPIC_API_KEY` → `ANTHROPIC_API_KEY_URI`), the single Bedrock candidate
+`us.anthropic.claude-haiku-4-5-20251001-v1:0`, fence-tolerant JSON extraction, the `throttled`
+fast-fail, rune-boundary truncation, `maxOutputTokens = 1200`. With no credentials the client
+disables itself at construction and every seat falls back instantly, which is what lets offline
+certification and `docker-smoke` finish in seconds.
+
+### The bc20 doctrine sheet — ten knobs, **no `chassis` key** (D1)
+
+Each knob has a type, a range, a default, and a named site in the bc20 chassis. Unknown key, wrong
+type or out-of-range value → **that field's default**, recorded in `sheet_defaults_applied` /
+`sheet_unknown_fields`. A sheet can never be rejected, so a cog can never forfeit a match by
+answering badly — only by answering weakly.
+
+| field | type / values | default | what it changes (`src/battlecode/years/bc20/chassis/…`) |
+|---|---|---|---|
+| `opening` | `rush` \| `lattice` \| `passive_lattice` \| `turtle` | `passive_lattice` | `boc.nim` `openingPlan()` — the build order and the role split for the first 400 rounds. `rush`: 8 miners then a forward Design School near the enemy HQ, landscapers dig the enemy HQ out and bury it. `lattice`: terraform outward from the HQ while contesting the middle. `passive_lattice`: terraform inward first, wall the HQ, then expand (the Bowl of Chowder build). `turtle`: wall immediately, minimum miners, maximum net guns. |
+| `terraform_start_round` | int 1…1500 | 300 | `landscaper.nim` `terraformOpensAt()` — the round at which landscapers stop reinforcing the wall and start raising the lattice. |
+| `lattice_radius` | int 2…12 | 6 | `lattice.nim` — the Chebyshev radius around the own HQ inside which every non-wall tile is raised to `waterLevel(round + 250) + 1`. |
+| `landscaper_count_curve` | `lean` \| `steady` \| `swarm` (target = `4 + round/220` × 0.6 / 1.0 / 1.7, capped 40) | `steady` | `hq.nim` / `designschool.nim` `landscaperTarget(round)`. |
+| `miner_count_curve` | `lean` \| `steady` \| `swarm` (target = `6 + round/300` × 0.6 / 1.0 / 1.7, capped 25) | `steady` | `hq.nim` `minerTarget(round)`. |
+| `vaporator_budget` | int 0…6 | 2 | `miner.nim` — stop building vaporators once `vaporatorsBuilt >= budget`. Each costs 500 soup and returns 2 soup + −1 global pollution per round. |
+| `drone_role` | `harass` \| `wall` \| `buster` \| `carry_landscapers` | `harass` | `drone.nim` — `harass`: hunt enemy units inside `r² ≤ 3` and drop them on the nearest flooded tile. `wall`: hold a ring at Chebyshev 4 from the enemy HQ, blocking ground movement. `buster`: hunt *enemy drones sitting in a wall* by baiting them over own net guns, and ferry a landscaper to the enemy HQ. `carry_landscapers`: ferry own landscapers over impassable elevation onto the lattice. |
+| `net_gun_ring` | int 0…6 | 2 | `miner.nim` — how many net guns to build around the own HQ before spending on anything else. |
+| `rush_trigger` | int 0…1500 (**0 = never**) | 0 | `boc.nim` — the round at which the rush wave commits to the enemy HQ. Only meaningful with `opening = rush` (with any other opening it selects the round at which a single harassing landscaper is sent). |
+| `wall_hq_round` | int 0…1500 (**0 = never**) | 250 | `landscaper.nim` — the round at which landscapers begin raising the 8 tiles adjacent to the own HQ. Never walling is a real (and usually losing) choice: the HQ drowns between round 464 and 1210. |
+
+`notes` and `motto` are free text with hard caps (§Server, player, protocol); every truncation is on
+**rune** boundaries.
+
+**Every knob must have teeth.** `tests/test_bc20_knobs.nim` is a CI gate that proves each of the ten
+visibly changes play, with a named signed stat delta per knob (§Tests item 11), and the endcard
+reports the economic story so a spectator can see the knob in the match.
+
+### The two champion prompts (`PLAYER_PROMPT`; both champions are LLM policies)
+
+- **champion #1, `battlecode-bc20-latticer` (daveey)**: *"You command a Battlecode 2020 team. The
+  water rises every round and your HQ starts at elevation 2–5, so it drowns somewhere between round
+  464 and round 1210 unless landscapers raise the ground around it. Your doctrine: out-build the
+  flood. Set opening to \"lattice\" or \"passive_lattice\", wall the HQ early (wall_hq_round 180–260),
+  start terraforming by round 250–350, take a lattice_radius of 6–9, and spend on vaporators
+  (2–4) so your soup keeps coming after the near deposits are mined out. Keep a net_gun_ring of at
+  least 2 so enemy drones cannot lift your landscapers off the wall, run drone_role
+  \"carry_landscapers\" or \"wall\", and leave rush_trigger at 0. In notes, say which elevation you
+  are building to and by what round."*
+- **champion #2, `battlecode-bc20-rusher` (daveey-1)**: *"You command a Battlecode 2020 team. An
+  enemy HQ needs 50 dirt on it to die, and a landscaper carries 25. Your doctrine: get there before
+  their wall does. Set opening to \"rush\", a rush_trigger between 180 and 320, a lean or steady
+  miner_count_curve, and a swarm landscaper_count_curve so the second wave arrives while the first is
+  digging. Take drone_role \"harass\" or \"buster\" to lift their landscapers off their own wall and
+  drop them in the water. Keep wall_hq_round non-zero anyway — if the rush stalls you still have to
+  survive the flood — but keep lattice_radius small (2–4) and vaporator_budget low (0–1); soup spent
+  on economy is soup not spent on landscapers. In notes, say what you do if the rush fails."*
+
+Both are appended to a shared system preamble carrying the rules digest, the sheet schema with every
+default and range, the flood table, the map cards for all three games, the scoring formula, the alias
+pair, and the reply contract ("reply with ONE JSON object; your reply must begin with `{`"). The
+assistant turn is prefilled with `{` and the prefix re-attached before parsing (the procgen 0.1.2
+scar), unchanged.
+
+### Scripted baselines (`PLAYER_SCRIPTED=<name>`, same image, env-switched)
+
+`src/battlecode/baselines.nim` becomes **year-aware**: `baselineFor(year, name)`. For `bc20` the two
+published names are `bowl-of-chowder` (the default for an unrecognised name — a seat that says
+nothing useful plays the strong published doctrine, not the weak floor) and `examplefuncsplayer`.
+The name selects **both** the reply sheet **and the chassis**; the chassis is never a sheet field
+(D1).
+
+**`bowl-of-chowder` — the strong baseline and the champion chassis.** Behaviour ported from
+`StoneT2000/Battlecode2020` `src/FinalChowBotStable/` (AGPL-3.0), parameterised by the ten knobs. Its
+scripted reply is the all-defaults sheet, i.e. the passive-lattice build. Algorithm, per role:
+
+- **HQ** (`hq.nim`): on round 1 broadcast `HQ_LOCATION` with the own HQ tile; thereafter build a
+  Miner whenever `minersAlive < minerTarget(round)` and soup ≥ 70, preferring the direction away
+  from the nearest flooded tile. Shoot any enemy drone within `r² ≤ 15` before building. From round
+  `wall_hq_round`, broadcast `WALL_IN` once. If `dirtOnSelf ≥ 25` (half-buried) broadcast
+  `HQ_UNDER_ATTACK` every round and stop building until it clears.
+- **Miner** (`miner.nim`): if `soupCarrying = 100` or (`soupCarrying > 0` and no soup is visible),
+  path to the nearest refinery/HQ and deposit; else path to the nearest known soup tile (own vision,
+  else the best tile broadcast by `ANNOUNCE_SOUP`), mine it, and broadcast `ANNOUNCE_SOUP` the first
+  time it sees a deposit of ≥ 200. One miner is elected **builder** (lowest id alive) and builds, in
+  this order and only when the team pool can afford it without stalling miner production: 1 Design
+  School at Chebyshev 2 from the HQ on the side away from the water; `net_gun_ring` Net Guns on the
+  HQ ring; 1 Fulfillment Center; `vaporator_budget` Vaporators inside the lattice; a second Design
+  School after round 600. Every miner flees a tile that will flood next round
+  (`elevation < waterLevel(round + 1)`).
+- **Design School** (`designschool.nim`): build a Landscaper whenever
+  `landscapersAlive < landscaperTarget(round)` and soup ≥ 150, preferring a direction on the HQ side.
+- **Landscaper** (`landscaper.nim`): three modes, in priority order. **(a) Wall**, from round
+  `wall_hq_round`: claim the lowest of the 8 tiles adjacent to the own HQ, dig from a tile *outside*
+  the lattice and deposit onto the claimed tile until it is `waterLevel(round + 400) + 2` or higher;
+  when every ring tile clears that bar, emit `wall_closed` and drop to (b). **(b) Terraform**, from
+  `terraform_start_round`: pick the lowest tile within `lattice_radius` of the HQ that is below
+  `waterLevel(round + 250) + 1` and raise it, keeping the checkerboard parity Bowl of Chowder used so
+  units can always path through the lattice. **(c) Attack**: if an enemy building is adjacent, deposit
+  onto it every turn; a landscaper delivered next to the enemy HQ digs the enemy wall down and then
+  buries the HQ. Any landscaper on a tile that floods next round moves first and digs second.
+- **Fulfillment Center** (`fulfillment.nim`): build a Delivery Drone whenever
+  `dronesAlive < 4 + round/300` (capped 14) and soup ≥ 150, and always when `NEED_DRONES` is on the
+  chain.
+- **Delivery Drone** (`drone.nim`): behaviour selected by `drone_role` (table above). Every role
+  avoids tiles within `r² ≤ 15` of a known enemy Net Gun or enemy HQ unless carrying a landscaper to
+  the enemy HQ; a carried unit is always dropped on the nearest flooded tile that is not adjacent to
+  a friendly building.
+- **Net Gun** (`netgun.nim`): shoot the closest enemy drone within `r² ≤ 15`, preferring one that is
+  carrying a unit.
+- **Signalling** (`signals.nim`): messages are 7 ints — `[SIGNAL_KEY, teamOrdinal, code, p0, p1, p2,
+  p3]` — submitted at a fee of `max(1, teamSoup/200)` and only when `teamSoup > 120`, so the
+  blockchain never starves the build. `SIGNAL_KEY` is a fixed constant shared by both teams, which is
+  deliberate: it reproduces the year's famous meta-gaming vector and it is what lets the endcard
+  decode both sides' traffic (§Viewer).
+- **Pathing** (`pathing.nim`): the bug-walk-with-BFS-window Bowl of Chowder used — a bounded BFS over
+  the sensed window (r² 24 or 35 by unit), falling back to a wall-follow when the target is outside
+  it, with a 6-tile no-repeat history to break oscillation. Charged against `DecisionOps`.
+
+This baseline satisfies the D2 survival gate by construction: it walls, it gunners, it terraforms,
+and `tests/test_bc20_baselines.nim` proves it (§Tests item 10c). It does not idle to a win — its
+opponent in the gate is the scaffold, which *acts* and merely drowns.
+
+**`examplefuncsplayer` — the weak floor and the parity oracle's other side.** Ported
+**statement-for-statement** from `battlecode20/example-bots/src/main/examplefuncsplayer/RobotPlayer.java`:
+the HQ tries to build a Miner in each of the 8 directions in order; a Miner submits a 7×`123`
+transaction at fee 10 on each of its first two turns, tries two random moves, tries to build a
+Fulfillment Center in each direction, then tries to refine and then to mine in each direction; a
+Fulfillment Center tries to build a Drone in each direction; a Drone picks up the first enemy unit
+within `r² ≤ 3` or else moves randomly; Refinery, Vaporator, Design School, Landscaper and Net Gun do
+nothing. **It may not gain behaviour** — it is one side of the differential oracle, exactly as bc26's
+`scaffold.nim` is. Its scripted reply is the all-defaults sheet (no knob it reads).
+
+Both replies go through the **same** `validate` the LLM path uses, which is what makes the
+bounded-orders test meaningful and an LLM doctrine and a scripted one strictly comparable.
+
+### Degrade-never-hang
+
+| failure | response |
+|---|---|
+| no LLM reply within `attempt1Ms` (20 000) | one retry with `retryMs` (12 000), logged `will retry` — never `falling back` |
+| second failure, unparseable JSON, or a provider throttle with no other candidate model | that seat plays the **fallback sheet** below on the `bowl-of-chowder` chassis, `results.fallbacks[seat] = 1`, a `doctrine_fallback` event names the cause, the log line says `falling back` |
+| doctrine phase exceeds `doctrineBudgetMs` | whatever is unresolved takes the fallback sheet; the match starts anyway |
+| a sheet field is unknown, mistyped or out of range | that field alone takes its default; the rest of the sheet applies |
+| a seat never registers | it plays the fallback sheet; the slot is reported to `COGAME_PLAYER_FAILURE_URI` and the server **logs loudly** rather than silently defaulting (the grf-football scar) |
+| a game exceeds `perGameBudgetSeconds`, or the match exceeds `matchBudgetSeconds` | the running game is abandoned, finished games are scored, `results.reason = deadline` |
+| a side takes 2 games | the episode settles immediately — no padding |
+| no credentials at all (certification, docker-smoke) | the LLM client disables itself at construction; both seats are scripted and the episode completes in seconds |
+
+**The fallback sheet, verbatim** — identical to the `bowl-of-chowder` baseline reply:
+
+```json
+{"sheet":{"opening":"passive_lattice","terraform_start_round":300,"lattice_radius":6,
+          "landscaper_count_curve":"steady","miner_count_curve":"steady","vaporator_budget":2,
+          "drone_role":"harass","net_gun_ring":2,"rush_trigger":0,"wall_hq_round":250},
+ "notes":"default bowl-of-chowder doctrine","motto":"Soup first."}
+```
+
+---
+
+## Sim module
+
+`src/battlecode/` stays one deterministic sim compiled **twice** from the same sources: natively into
+`/bin/battlecode` and to wasm into `replay-viewer/dist/bc_replay.js|.wasm|.data`. Nothing
+gameplay-related lives outside it; the viewer never re-implements a rule.
+
+### New and changed files
+
+| file | status | role |
+|---|---|---|
+| `src/battlecode/years/bc20/constants.nim` | **new, generated** | every `GameConstants` value + the `RobotType` table, emitted by `tools/gen_year_constants.py --year bc20` from the pinned battlecode20 checkout; CI regenerates and byte-diffs |
+| `src/battlecode/years/bc20/world.nim` | **new** | world state, the grid (elevation, flood, soup, pollution), robots, `TeamInfo`, spawn/destroy, and every action of rule 6 |
+| `src/battlecode/years/bc20/rules.nim` | **new** | the round loop (rules 1–9), the end-of-match ladder, the points formula |
+| `src/battlecode/years/bc20/flood.nim` | **new** | the water-level table lookup, `floodfill`, `tryResurface`, drown resolution |
+| `src/battlecode/years/bc20/pollution.nim` | **new** | global pollution, the per-robot local additive/multiplicative registry, the cooldown and sensor coefficients |
+| `src/battlecode/years/bc20/blockchain.nim` | **new** | the transaction pool, `Transaction.compareTo`, per-round minting, fee accounting, the re-seeded transaction-id RNG |
+| `src/battlecode/years/bc20/cows.nim` | **new** | the NPC cow provider, including the per-spawn symmetry recomputation |
+| `src/battlecode/years/bc20/maps.nim` | **new** | the converted bc20 pool, the loader, the per-episode draw (`drawMaps`, `sideAslotFor` reused from the bc26 shape) |
+| `src/battlecode/years/bc20/knobs.nim` | **new** | the ten-knob `Doctrine20` type, defaults, per-field repair, `toJson`, `plainWords` |
+| `src/battlecode/years/bc20/chassis/*.nim` | **new** | `boc.nim`, `scaffold.nim`, `hq.nim`, `miner.nim`, `designschool.nim`, `landscaper.nim`, `fulfillment.nim`, `drone.nim`, `netgun.nim`, `lattice.nim`, `pathing.nim`, `signals.nim`, `kit.nim` |
+| `src/battlecode/years/registry.nim` | **one line added** | `YearSpec(id: "bc20", title: "Battlecode 2020 — Soup", maxRounds: 1500, pools: @["small","mixed","large"], atlas: "atlas_bc20")` |
+| `src/battlecode/years/dispatch.nim` | **new** | the **only** place a `case year` appears: `sheetFor(year, text)`, `baselineFor(year, name)`, `playGameFor(year, …)`, `spritesFor(year, …)` |
+| `src/battlecode/sheet_common.nim` | **new (extracted)** | `normalizeKey`, `readNumber`, `readBool`, `extractJsonObject`, `sanitizeLine`, the rune/byte caps — moved out of `sheet.nim` unchanged |
+| `src/battlecode/sheet.nim` | **thinned** | the year-neutral `Sheet` envelope (`notes`, `motto`, `defaultsApplied`, `unknownFields`, `submitted`, `knobsJson`) and a dispatcher into `years/<year>/knobs.nim`. bc26's `Doctrine` type, its defaults, its `validate` body and its `plainWords` **move verbatim** into `years/bc26/knobs.nim` (minus the `chassis` branch, which D1 deletes). No bc26 semantics change. |
+| `src/battlecode/baselines.nim` | **year-aware** | `baselineFor(year, name)`; bc26 `awu`/`scaffold`, bc20 `bowl-of-chowder`/`examplefuncsplayer` |
+| `src/battlecode/render.nim` | **year-aware** | sprite mapping per `YearSpec.atlas`; bc20 adds elevation shading and the flood overlay |
+| `src/battlecode/broadcast.nim` | **year-aware** | the bc20 scorebug / feed / endcard shell records |
+| `src/battlecode/rng.nim` | **unchanged, reused** | the `java.util.Random` port and `IDGenerator` already carry everything bc20 needs |
+| `data/maps/bc20/*.json` | **new, committed** | 18 converted maps |
+| `data/bc20/water_levels.json` | **new, committed** | the 1500-entry float32 water-level table (below) |
+| `data/atlas_bc20.png` / `.json` | **new, committed** | the 2020 sprite atlas |
+| `tools/convert_maps.py` | **`--year bc20` added** | reads `.map20` and writes `data/maps/bc20/<name>.json` |
+| `tools/gen_year_constants.py` | **`--year bc20` added** | reads the 2020 `GameConstants.java` + `RobotType.java` |
+| `tools/build_sprite_atlas.py` | **`--year bc20` added** | cuts `atlas_bc20.*` from the 2020 client sprites |
+| `tools/JavaWaterLevels.java` | **new, CI-only** | regenerates `data/bc20/water_levels.json` under the CI JDK |
+| `tools/oracle/examplefuncsplayer20/RobotPlayer.java` | **new, CI-only** | the deterministic oracle bot (below) |
+| `tools/parity_trace_bc20.nim` / `.py` | **new, CI-only** | the two sides of the bc20 parity trace |
+
+### Determinism
+
+- **`rng.nim` is reused unchanged.** bc20 needs `java.util.Random` in four places, all already
+  covered by the existing port: `IDGenerator(mapSeed)` (48-bit LCG + `nextInt(bound)` with both the
+  power-of-two shortcut and the rejection loop + the Fisher–Yates block shuffle, `ID_BLOCK_SIZE 4096`,
+  `MIN_ID 10000`), the transaction-id RNG, the cow RNG (`nextDouble`), and the CI oracle bot's RNG.
+  Robot ids therefore match the Java engine's for a given map seed, which is what makes the parity
+  trace comparable row for row.
+- **The transaction-id RNG quirk.** `RobotControllerImpl.random` is a `private static Random`
+  assigned `new Random(gameWorld.getMapSeed())` **in the constructor**, so it is re-seeded every time
+  a robot controller is constructed — on every spawn, and on the two HQs and every cow at map load.
+  The port reproduces this exactly, because it decides the minting order among equal-fee
+  transactions.
+- **The world RNG** is seeded from the map's own `randomSeed` field, exactly as the engine does. The
+  episode seed selects maps and side assignment, never the world RNG.
+- **`setWinnerArbitrary`'s `Math.random()`** is replaced by a draw from the world RNG (a documented
+  divergence; reachable only when neither team has a living robot).
+- **The water level is a committed table, not a formula.** `getWaterLevel` uses `Math.exp` and
+  `Math.sin`, which HotSpot implements as intrinsics that are *not* bit-identical to any libm we
+  would link natively or under emscripten. Since the function depends only on the round number,
+  `tools/JavaWaterLevels.java` emits `data/bc20/water_levels.json` — rounds 0…1500, each value the
+  **float32 bit pattern** as an 8-digit hex string — under the CI JDK, and the sim (native and wasm)
+  reads that table. The table is committed and CI regenerates and diffs it. Bit-exact against Java by
+  construction, on every platform, with no libm in the loop.
+- **All cooldown, pollution and sensor arithmetic is float32**, matching Java `float`, and
+  `Math.round(float)` is implemented as `floor(x + 0.5)`. The pollution coefficients keep their
+  closed forms; the `parity-oracle` job proves them equal to Java over the whole integer domain
+  `P ∈ [0, 65535]` in a JDK-only step (§Tests).
+- Every round appends to a **hash chain**; the viewer re-derives each round and compares, exposing
+  `bc_mismatch_round`. The seven per-team values entering the bc20 chain each round: team soup, soup
+  refined, living robots, net worth, dirt moved, transactions minted, and living-HQ flag; plus the
+  three global values global pollution, flooded-tile count and the water-level bit pattern.
+- Any wall-clock-driven fact (the `deadline` stop) is recorded as **one load-bearing record**
+  (`plan.abandonAfter[g]`) applied by the same proc on record and on playback — the particle-worlds
+  scar — and the record→re-derive test covers **every** bc20 end reason, not just `complete`.
+- **`GameVersion` bumps to `GV04`** in the same commit, with a prepend-only changelog line ("bc20
+  year module added; bc26 semantics unchanged"). `ReplayCompatibleGameVersions` becomes
+  `["GV03", "GV04"]` — nothing a GV03 replay carries changed meaning, so every hosted bc26 replay
+  keeps rendering. `tools/ci/check_gameversion.sh` is kept and claims the version across branches,
+  not just against `main` (the sibling run is live on the same repo).
+
+### The chassis, and the bytecode divergence
+
+The engine's per-robot **bytecode limit** (`RobotType.bytecodeLimit`: HQ 20 000, units 10 000, Net
+Gun 7 000, other buildings 5 000, Cow 0) has no meaning outside the JVM instrumenter. It is replaced
+by a **fixed per-robot `DecisionOps` budget at one tenth of the Java limit**: HQ 2000; Miner,
+Landscaper, Delivery Drone 1000; Net Gun 700; Refinery, Vaporator, Design School, Fulfillment Center
+500; Cow 0 (the engine's own cow provider reports 0 bytecodes). One credit is charged for each: tile
+sensed, robot examined in a sense sweep, BFS node expanded, direction evaluated, and block read.
+Credits are deducted inside `pathing.nim` / `kit.nim` and **enforced by the sim, not by the bot**.
+When the budget reaches zero the robot's turn ends where it stands — it is **not** resumed mid-computation
+next turn, which is the one place this differs from the JVM. This makes per-round cost bounded,
+machine-independent and deterministic.
+
+Why full metering is out of scope for v1, logged here so it is not re-litigated: metering Nim to
+Java bytecode granularity would require either a Nim-level instrumenter (a compiler project) or
+hand-annotating every statement with the `MethodCosts.txt` table, and neither buys anything the
+budget does not — the chassis are ours, they are written to fit the budget, and the *oracle* runs the
+one bot that provably never approaches the Java limit anyway. See "What parity means" below.
+
+### Maps
+
+**18 of the 52 official maps** are converted and committed. Sizes, seeds and symmetry below were read
+out of the real `.map20` flatbuffers, not assumed.
+
+| pool | maps (size, symmetry — **engine naming**) |
+|---|---|
+| `small` (6) | `maptestsmall` 32×32 vertical, `WateredDown` 32×32 horizontal, `Infinity` 33×33 rotational, `Spiral` 33×33 rotational, `Hourglass` 40×32 horizontal, `ALandDivided` 41×32 vertical |
+| `mixed` (12, **the `bc20` variant's pool**) | the six above + `Climb` 40×40 rotational, `Constriction` 40×40 rotational, `CentralLake` 41×41 rotational, `Toothpaste` 45×37 rotational, `TwoLakeLand` 45×45 horizontal, `CentralSoup` 48×48 rotational |
+| `large` (6, reserved for a later variant) | `Hills` 60×60 rotational, `OmgThisIsProcedural` 60×64 vertical, `Squares` 63×63 vertical, `BeachFrontProperty` 64×64 rotational, `Maze` 64×64 rotational, `TheHighGround` 64×64 rotational |
+
+`CowFarm` and `DidAMonkeyMakeThis` are deliberately excluded: both carry tiles at
+`Integer.MAX_VALUE/2` elevation, which is legal but makes the elevation shading meaningless and the
+timing untypical. `maptestsmall` is kept despite carrying soup on all 1024 tiles because it is the
+map the parity oracle and the fast smoke run on; the anomaly is noted in `docs/RULES-BC20.md`.
+
+**Symmetry is not in the file.** The 2020 `.map20` schema has no symmetry field, so the converter
+**detects** it exactly the way the engine does (`CowControlProvider.getSymmetry`): candidates in the
+order **`vertical`, `horizontal`, `rotational`**, each eliminated by the first tile where soup,
+elevation or robot type disagrees under that transform, first survivor wins, default `rotational`
+when none survives. Engine naming: `vertical` flips x (`symmetricX = w−1−x`), `horizontal` flips y
+(`symmetricY = h−1−y`), `rotational` flips both. `Squares` survives all three and therefore records
+`vertical`, which is what the engine picks. `tests/test_bc20_maps.nim` asserts the committed value
+against a fresh detection and asserts that the sim's own per-spawn recomputation agrees with the
+engine's on round 1.
+
+`tools/convert_maps.py --year bc20` writes `data/maps/bc20/<name>.json` carrying: `name`, `width`,
+`height`, `symmetry`, `random_seed`, `initial_water` (the map's `initialWater` int), `elevation` (the
+`dirt` int array), `water` (the bool array of initially flooded tiles), `pollution`, `soup`, and
+`initial_bodies` (id, team, type, x, y — 2 HQs plus the cows). The converted maps are **committed**
+and CI re-converts and diffs. The wasm bundle gets the same directory through the existing
+`--preload-file data@data`.
+
+**Draw**: `seed` (from `game_config.seed`, or 32 random bits when 0) picks three *distinct* maps from
+the variant's pool by successive seed-derived indices, and `(seed shr 8) and 1` decides which slot
+takes side A in game 1; sides alternate each game. Seed, map names and side assignment are recorded
+in results and in the replay.
+
+### The year module boundary
+
+`game_config.year` selects a `YearSpec`. Year-neutral machinery (`rng`, `sheet_common`, `sheet`,
+`decide`, `llm`, `broadcast`, `render`, `replay`, `results`, `server`, `match`) never branches on the
+year except through `years/dispatch.nim`. Adding 2020 is exactly what the bc26 note promised adding
+2027 would be: a new `years/bc20/` directory, a converted map set, a sprite atlas, one registry line,
+one dispatch entry and one manifest variant. The replay header records `year` so a viewer can never
+mis-derive an old recording.
+
+---
+
+## Server, player, protocol
+
+Protocol id: **`cogame.battlecode.v1` — unchanged.** The wire shape is identical; only the
+year-dependent *payload* differs (`year`, the map cards, `sheet_schema`, `scoring`). A new protocol
+id would force every existing bc26 consumer to re-register for no change in the contract. Both
+`game.protocols.player` and `game.protocols.global` continue to point at `docs/PROTOCOL.md`, which
+gains a bc20 section.
+
+### The player container (thin registrar) — unchanged
+
+`/bin/battlecode-player` reads `COWORLD_PLAYER_WS_URL` (legacy alias `COGAMES_ENGINE_WS_URL`), dials
+its seat with a bounded retry (240 × 500 ms), sends **one** registration blob and then only receives
+until the socket closes, then exits 0:
+
+```json
+{"type":"register","prompt":"<PLAYER_PROMPT or empty>",
+ "scripted":"bowl-of-chowder"|"examplefuncsplayer"|"awu"|"scaffold"|null,
+ "policy":"<PLAYER_POLICY_LABEL>"}
+```
+
+sent as a Sprite v1 chat blob (a **binary** frame — the server must not filter non-text frames) and
+re-sent a bounded number of times until acknowledged. The seat token is a **credential** and a wrong
+one is refused (commit `d581704`). A seat that sets neither env var takes the active year's default
+baseline. A seat whose registration never arrives is logged loudly and reported to
+`COGAME_PLAYER_FAILURE_URI`.
+
+### Per-seat observation (the doctrine prompt payload, recorded verbatim in the replay)
+
+```json
+{"protocol":"cogame.battlecode.v1","game_version":"GV04","year":"bc20",
+ "slot":0,"alias":"Clan Ash","opponent_alias":"Clan Basil","seed":871345,
+ "games":[{"map":"CentralLake","width":41,"height":41,"symmetry":"rotational",
+           "you_are":"A",
+           "hq_elevation":4,
+           "hq_separation":34,
+           "soup_tiles":50,"soup_total":24800,"soup_near_hq":3100,
+           "cows":4,
+           "initially_flooded_tiles":118,
+           "rounds":1500},
+          {"map":"Constriction","…":"…","you_are":"B"},
+          {"map":"maptestsmall","…":"…","you_are":"A"}],
+ "flood_table":{"1":256,"2":464,"3":677,"4":931,"5":1210,"6":1413,"7":1546},
+ "rules_digest":"<~7 KB condensed spec: flood, soup and refining, the seven build types, dig/dump and elevation, drone carry and drop, net guns, pollution, the blockchain and its fee model, the end ladder>",
+ "sheet_schema":{"…all ten knobs, their values, ranges and defaults…"},
+ "scoring":{"weights":{"hq_survival":60,"unit_share":25,"net_worth_share":15},
+            "win_bonus_per_game":100,"games":3,
+            "note":"shares are float32; points truncate to an integer"},
+ "budget":{"attempt1_ms":20000,"retry_ms":12000,"one_shot":true}}
+```
+
+**Visible**: everything above — own alias and side, all three map cards *with the seat's own HQ
+starting elevation and the HQ separation*, the seed, the flood table (which round each elevation
+floods at), the full knob surface with defaults, the scoring weights, the deadlines. Because every
+map is symmetric, both seats see numerically identical map cards; `you_are` is the only asymmetry.
+**Hidden**: the opponent's doctrine, sheet, notes and motto (sealed and simultaneous — never sent, in
+either direction, at any time); the opponent's real player name (only the alias); every in-match
+state (a cog receives **no** per-round observation — one sealed doctrine, then the war); the other
+seat's fallback status. The only cross-team channel inside a match is the sim's own blockchain and
+what a robot can see.
+
+### Reply schema and caps
+
+```json
+{"sheet":{"opening":"rush","terraform_start_round":420,"lattice_radius":3,
+          "landscaper_count_curve":"swarm","miner_count_curve":"lean","vaporator_budget":0,
+          "drone_role":"harass","net_gun_ring":1,"rush_trigger":240,"wall_hq_round":300},
+ "notes":"Bury them by 400; if it stalls, wall at 300 and lattice out.",
+ "motto":"Soup is for the patient."}
+```
+
+| field | cap | on violation |
+|---|---|---|
+| whole reply | **16 KB of BYTES**, cut on a rune boundary | unparseable → retry once → fallback sheet |
+| `sheet` | ≤ **32** keys, each value type- and range-checked | bad field → that field's default, recorded |
+| `notes` | **280 runes** | truncated |
+| `motto` | **48 runes** | truncated |
+| unknown sheet keys recorded | ≤ **16** keys, each ≤ **40 runes** | truncated |
+| provider error text stored in the replay | **200 runes** | truncated |
+
+**Every cap is measured in runes and every truncation lands on a rune boundary**
+(`runeLen`/`runeSubStr`; the reply's 16 KB cap is measured in bytes but still cut on a rune
+boundary — commit `a8684c0`): byte-slicing a multi-byte character renders fine in a browser and then
+fails a strict UTF-8 parser, which is exactly what makes a replay unreadable to everything but one
+lenient viewer.
+
+### Results document
+
+The closed schema is **shared with bc26** and stays that way. The only change is that the
+year-specific per-game statistics move from `required` to optional, so each year emits its own:
+
+- `results.games[].` **required** (year-neutral): `map`, `side`, `rounds_played`, `winner`,
+  `end_reason`.
+- `results.games[].` **optional**: bc26's existing eleven keys, unchanged and still emitted by bc26;
+  plus bc20's keys below. The two sets do not collide. `end_reason`'s enum becomes the union of both
+  years' values plus `abandoned`. This is deliberately *not* a nested `stats` object: nesting would
+  change the bytes every shipped bc26 replay's `result` block carries and force a compatibility shim
+  in the endcard. Relaxing `required` changes nothing that already exists.
+
+bc20's per-game keys, each a 2-array in **seat** order unless marked scalar: `hq_alive`,
+`hq_lost_round` (−1 if alive), `hq_lost_cause` (`buried` \| `drowned` \| `none`), `soup_mined`,
+`soup_refined`, `net_worth`, `units_alive`, `units_built`, `miners_built`, `landscapers_built`,
+`drones_built`, `vaporators_built`, `net_guns_built`, `dirt_moved`, `drone_pickups`,
+`drone_water_drops`, `net_gun_kills`, `transactions_sent`, `transactions_minted`,
+`blockchain_soup_spent`; scalars `global_pollution_peak`, `flooded_tiles_end`, `water_level_end`.
+
+Top level, unchanged: `names`, `aliases`, `scores`, `wins`, `points`, `games`, `seed`, `year`,
+`policy_kind`, `sheet_defaults_applied`, `fallbacks`, `decision_ms`, `sim_seconds`, `reason`,
+`wall_clock_seconds`, `game_version`.
+
+### Replay (`COGAME_SAVE_REPLAY_URI`) — one UTF-8 JSON document, self-sufficient
+
+```jsonc
+{"format":"cogame-battlecode-replay","version":1,"protocol":"cogame.battlecode.v1",
+ "game_version":"GV04","year":"bc20",
+ "config":{ /* the resolved game config, tokens EXCLUDED */ },
+ "seed":871345,
+ "aliases":["Clan Ash","Clan Basil"],
+ "names":["daveey","daveey-1"],          // spectator-side only; agents never see these
+ "seats":[{"slot":0,"alias":"Clan Ash","name":"daveey","policy":"llm","chassis":"bowl-of-chowder",
+           "sheet":{…as applied…},"sheet_submitted":"{…as received…}",
+           "sheet_defaults_applied":["lattice_radius"],"sheet_unknown_fields":["chassis"],
+           "notes":"…","motto":"…","decision_ms":8123,
+           "prompt":{ /* THE OBSERVATION, verbatim */ },
+           "fallback":null,"fallback_detail":null}],
+ "prompt_preamble":"…",
+ "games":[{"index":0,"map":"CentralLake","map_json_sha256":"…","sides":["A","B"],
+           "side_a_slot":0,"rounds":947,
+           "hash_chain_sha256":"…","hash_chain_rounds":"…"}],
+ "plan":{"maps":[…],"side_a_slots":[…],"abandon_after":[…],"max_rounds":1500},
+ "events":[ … ],
+ "result":{ /* identical to COGAME_RESULTS_URI */ }}
+```
+
+**Self-sufficiency is by re-derivation, not by bulk.** Names, config, seed, the map identity (with a
+sha256 of the committed converted map the bundle also ships), both doctrine sheets, the chassis each
+seat drove, and the event list are all in the file, and the wasm sim replays every round from them.
+**No `.bc20` bytes, no per-round state dump, no blockchain dump** — the blockchain is a pure function
+of the sim, so the browser re-derives it and the endcard reads the re-derived blocks. No server is
+contacted except S3 for the `.replay` file. The per-round hash chain lets the viewer prove its
+re-derivation matches the recording (`bc_mismatch_round`, surfaced as `data-replay-mismatch-round`
+and in `#mmwarn`).
+
+### Event vocabulary carried by the replay
+
+Pre-match events carry `ms`; in-match events carry `game` and `round`. Ten beat kinds are emitted and
+**every one has CSS** (§Viewer).
+
+| `kind` | fields | beat | drawn as |
+|---|---|---|---|
+| `episode_start` | `seed`, `year`, `maps`, `aliases` | — | feed line |
+| `doctrine_requested` | `slot`, `attempt`, `deadline_ms` | — | feed line |
+| `doctrine_received` | `slot`, `attempt`, `latency_ms`, `defaults_applied`, `unknown_fields` | `doctrine` | feed line |
+| `doctrine_retry` | `slot`, `cause` (`timeout`\|`parse`\|`throttled`\|`transport`) | — | feed line (amber) |
+| `doctrine_fallback` | `slot`, `cause` | `doctrine` | feed line (red) |
+| `game_start` | `game`, `map`, `width`, `height`, `sides` | `game` | beat + feed |
+| `flood_stage` | `game`, `round`, `level` (int 1…7), `water_level`, `flooded_tiles` | `flood` | beat + feed ("water reaches elevation 3") |
+| `first_build` | `game`, `round`, `alias`, `unit` (`design_school`\|`landscaper`\|`fulfillment_center`\|`drone`\|`vaporator`\|`net_gun`) | `build` | beat + feed |
+| `wall_closed` | `game`, `round`, `alias`, `min_ring_elevation` | `wall` | beat + feed |
+| `rush_launched` | `game`, `round`, `alias`, `units` | `rush` | beat + feed |
+| `drone_water_drop` | `game`, `round`, `alias`, `victim_alias`, `victim_unit` | `drop` | beat + feed |
+| `hq_buried` | `game`, `round`, `alias` (victim), `by_alias`, `dirt` | `bury` | **chapter marker** |
+| `hq_drowned` | `game`, `round`, `alias` (victim), `water_level` | `drown` | **chapter marker** |
+| `game_end` | `game`, `round`, `winner_alias`, `winner_slot`, `end_reason`, `points` | `end` | beat + feed |
+| `game_abandoned` | `game`, `round`, `map` | `end` | beat + feed |
+| `episode_end` | `reason` | — | endcard |
+
+`flood_stage` is emitted once per integer level reached, so a 1499-round game emits at most 6 of
+them; `first_build` is emitted once per team per unit kind. The whole event list for a three-game
+match is a few hundred entries.
+
+---
+
+## Viewer
+
+The standard static wasm path, no exceptions: `"replay_viewer": {"bundle": "static-replay-viewer"}`,
+built by `tools/build_replay_viewer.sh` (unchanged — same containment checks, same
+`docker build --target replay-viewer-builder` + `docker create` + `docker cp` shape, same
+`sim_sources_stamp` guard so a stale committed bundle fails CI). The bundle contains **the same sim
+module**, now including `years/bc20/`, compiled to wasm; the browser re-derives every round from the
+replay's events, config and seed. No pod, no live viewer route, no `.bc20` bytes, no 2020 TypeScript
+client.
+
+### All four viewer files come from ONE starter: `cogame-battlecode` (its own shipped bc26 viewer)
+
+The viewer is **extended, never replaced**. Lineage: `coworld-ctf` → `cogame-battlecode` → here.
+
+| bundle file | source | treatment |
+|---|---|---|
+| `replay-viewer/config.nims` | `cogame-battlecode/replay-viewer/config.nims` | **unchanged, byte for byte.** The `--preload-file {rootDir}/data@data` flag already carries the whole `data/` tree, so `data/maps/bc20/`, `data/bc20/water_levels.json` and `data/atlas_bc20.*` need no flag change. `EXPORTED_FUNCTIONS` is unchanged (no new export). **No `MODULARIZE`, no `EXPORT_NAME`** — the link flags stay exactly as they are. |
+| the wasm entry `replay-viewer/bc_replay.nim` | `cogame-battlecode/replay-viewer/bc_replay.nim` | extended in place: the same exports (`bc_load_replay`, `bc_frame`, `bc_input`, `bc_packet_ptr/_len`, `bc_mismatch_round`, `bc_error_ptr/_len`, `bc_stage_ptr/_len`, `bc_game_version_ptr/_len`, `bc_sim_sources_stamp_ptr/_len`), the same `stageNote` OOM buffer and the same `emscripten_exit_with_live_runtime` main. It reads the replay header's `year` and steps that year's sim through `years/dispatch.nim`. **No new export, no new bootstrap.** |
+| `replay-viewer/static_replay.js` + `static_replay_worker.js` | `cogame-battlecode/replay-viewer/…` | **unchanged.** The worker keeps its bootstrap exactly: a global `var Module = {}`, `Module.locateFile`, `Module.onAbort`, `Module.onRuntimeInitialized = start`, and `importScripts('./wire_constants.js','./broadcast_core.js','./bc_replay.js')` at the end of the file. Splicing an `onRuntimeInitialized` bootstrap onto `MODULARIZE`/`EXPORT_NAME` link flags is the cogame-lantern 2026-08-23 silent deadlock; all four files here come from this one starter and none of the four changes its loader. |
+| `index.html` | `cogame-battlecode/client/replay_broadcast.html` | the **existing page with a bc20 game block appended**, assembled by the same `sed` marker substitution already in `Dockerfile.replay-viewer` (`<!-- WIRE_CONSTANTS -->`, `<!-- CHROME_COMMON -->`, `<!-- BROADCAST_CORE --> → static_replay.js`). Nothing is rewritten and no existing id is reused for a different purpose (the cogame-gridlock 2026-08-23 scar). |
+
+Also unchanged and byte-for-byte: **`client/chrome_common.js`** and **`client/broadcast_core.js`**
+(their sha256 is already asserted against the coworld-ctf copies in `tests/test_viewer.nim`, and that
+assertion stays green because neither file is touched). `wire_constants.js` is regenerated from the
+sim by `tools/gen_wire_constants.nim`, as today.
+
+### The appended bc20 game block
+
+**No starter element is removed.** The bc26 block's elements (`#coopchip`, `#bars`, `#gamechips`,
+`#econ`, `#doctrines`) stay exactly where they are; the bc20 block adds its own, with ids that are all
+new and all prefixed:
+
+- `#bc20-flood` — the water readout: the water level to 2 dp, a flood ring gauge (percentage of the
+  map under water), and `HQ elev N / water M` per clan, flashing red when `water ≥ HQ elevation − 1`.
+- `#bc20-soup` — team soup pools, plus soup mined and refined per clan.
+- `#bc20-units` — per clan, counts by type (Mi / La / Dr / Va / NG / DS / FC) and the HQ's dirt load
+  as `dirt/50`.
+- `#bc20-doctrines` — both sheets in plain words, **dismissible** (D3): a `#bc20-doctrines-close`
+  button with `aria-label="Dismiss doctrines"`, an `Escape` binding, and a `#bc20-doctrines-toggle`
+  chip in the scorebug that re-opens it. It sits above the board area and **never** inside the
+  transport band.
+- `#bc20-chain` — the blockchain panel on the endcard (below).
+
+Year selection is one attribute plus CSS, not a rewrite: `static_replay.js` sets
+`document.documentElement.dataset.year` from the replay header, and the stylesheet hides
+`[data-year="bc20"] #coopchip, [data-year="bc20"] #bars, …` and `[data-year="bc26"] #bc20-*`.
+
+### Zoom: KEEP `#viewpanel`
+
+The bc20 variant's pool tops out at 48×48 and the reserved large pool at 64×64. The native board
+render is 16 px per tile, so 768–1024 px wide — **larger than the 360 px featured-match frame**, where
+a 48×48 board would give 7.5 px per tile. So the inherited `#viewpanel` (zoom bar + minimap, with
+`?viewpanel=0` still honoured for thumbnail capture) is **kept**, wired to the same
+`zoomAt/setZoom/panBy/panTo/resetView` core API the worker already forwards. The default view is
+fit-to-board, so a spectator who touches nothing sees the whole map and the flood front.
+
+### Transport rules
+
+- `relayout()` (inherited, kept) sets **`--hudscale`**, **`--topband`** and **`--band`** on `:root`,
+  iterating to a fixed point so a map-aspect change cannot leave dead strips.
+- **Nothing is overlaid in the transport band**: the board fits *between* the reserved top band
+  (scorebug) and bottom band (transport). `#bc20-doctrines` and `#bc20-chain` are explicitly excluded
+  from that band.
+- The **endcard stops at `var(--band)`** (`#endcard { bottom: var(--band) }`) and **every seek
+  dismisses it**: `seek()` clears the card before moving the playhead.
+- **Scrubber beats are clickable, labelled `<button>`s** with an `aria-label` and a `title`
+  ("HQ BURIED — Clan Ash, game 2, round 947"), built by a bc20-block function with its **own** name,
+  `buildBc20BeatButtons` — never `markBeat` (the tandem 2026-08-23 hoisting collision) and never
+  colliding with the bc26 block's `buildBeatButtons`. CSS exists for **every kind emitted**:
+  `.beat-marker.doctrine`, `.game`, `.flood`, `.build`, `.wall`, `.rush`, `.drop`, `.bury`,
+  `.drown`, `.end`.
+- Transport controls keep the starter's ids: `#btn-restart`, `#btn-back`, `#btn-play`, `#btn-fwd`
+  (relabelled **+25 rounds**), `#btn-end`, `#btn-loop`, `#btn-skip`, `#btn-spoilers`, `#speedchips`,
+  `#tick-clock`, `#win-chip`, `#scrub` + `#scrub-fill`/`#scrub-head`/`#scrub-win`.
+
+### Load signalling
+
+`static_replay.js` sets `document.documentElement.setAttribute('data-replay-loaded', 'true')` on the
+**first drawn frame** (the worker's `loaded` message after the first board frame is composited —
+never on rAF timing at the call site, the chorus 2026-08-24 scar), and the `coworld-replay` bridge
+posts `ready` from a callback fired **after** that attribute is set. On any failure — fetch, JSON
+parse, an unknown `game_version`, a wasm abort, or a hash mismatch that prevents rendering — it sets
+`data-replay-error="<message>"` on `<html>` and shows the failure card. Unchanged from the starter,
+restated because it is a checklist item.
+
+### Art
+
+`data/atlas_bc20.png` + `data/atlas_bc20.json` (≈ 300 KB, committed), cut by
+`tools/build_sprite_atlas.py --year bc20` from the official 2020 client's sprite tree
+(`battlecode20/client/visualizer/src/static/img/` at a pinned commit), verified present:
+`HQ_{red,blue}.png`, `Miner_*`, `Landscaper_*`, `Drone_*` **and `Drone_*_carry`**, `Refinery_*`,
+`Vaporator_*`, `SOUPER_*` (the Design School), `Fulfillment_*`, `Net_gun_*`, `Cow.png`, and
+`soup.png`. Credited in `NOTICE`. Palette follows the engine side, not the seat: **red = side A,
+blue = side B**, and because sides alternate each game the scorebug plate keeps the *alias* constant
+and recolours its swatch per game. It looks like Battlecode 2020 because it **is** Battlecode 2020's
+art.
+
+Board rendering (`render.nim`): each tile gets a nine-step elevation ramp keyed to the *current* water
+level (so the lattice reads as terrain rising out of the sea, not as a static heightmap), a water
+overlay on flooded tiles, and a soup dot sized by the tile's remaining soup. Drones draw the `_carry`
+frame while holding. The HQ draws a dirt-fill ring at `dirt/50`.
+
+### Readouts, and 360 px
+
+The viewer is **legible at 360 px wide** — the featured-match iframe width — and is checked at that
+width, not at desktop width (`.plate-name { flex: 1 1 auto; min-width: 3.2em }`, labels hidden under
+640 px, `#viewpanel` shrinking to its minimum before anything else).
+
+- `#scorebug`: both clan plates — `CLAN ASH` over the real player name (`daveey`) and the motto — the
+  live points number, and `#gamechips` (best-of-3 state).
+- `#clock` / `#clock-time` / `#clock-caption`: `round 947 / 1500`, `game 2 of 3 — CentralLake`.
+- `#bc20-flood`, `#bc20-soup`, `#bc20-units` as above.
+- `#board`: elevation shading, the flood, soup, all seven building types, miners/landscapers/drones,
+  cows, and the drone carry frame.
+- `#bc20-doctrines`: each sheet in plain words ("rushes at round 240", "walls at 300", "lattice
+  radius 3", "swarm landscapers", "no vaporators", "drones harass"), plus the capped `notes` and a
+  fallback badge when a seat's doctrine came from the fallback sheet. Dismissible.
+- `#killfeed`: the event beats, revealed as the playhead reaches them (spoiler gate honoured).
+- `#endcard`: winner alias **and** real name; the win condition in plain words ("Clan Basil buried
+  Clan Ash's HQ at round 947 under 50 dirt" / "Clan Ash's HQ drowned at round 1103, water 4.71" /
+  "round limit — Clan Basil held 41 robots to 28"); the per-game score line; the economic story
+  (soup refined, landscapers built, dirt moved, drones downed, enemies dropped in the water per
+  clan); and `#bc20-chain`, the **blockchain panel**: per clan, transactions minted, soup spent on
+  fees, the highest fee paid and the round it bought, and the **last five minted messages decoded to
+  plain words** through the chassis's own signal table ("Clan Ash, round 612 — WALL_IN"). Messages
+  whose first int is not `SIGNAL_KEY` are shown as raw ints. Nothing about the chain is stored in the
+  replay: the wasm sim re-derives every block.
+
+---
+
+## Packaging
+
+- **`compose.yaml` — unchanged.** Service names are load-bearing (`game` → `{{GAME_IMAGE}}`,
+  `player` → `{{PLAYER_IMAGE}}`, the lantern 0.1.0 scar). One image, two entrypoints.
+- **`Dockerfile` — unchanged in shape.** The nimby recipe (nimby 0.1.26, Nim 2.2.4) builds
+  `/bin/battlecode` and `/bin/battlecode-player` from one image and copies `data/` (now carrying
+  `maps/bc20/`, `bc20/water_levels.json` and `atlas_bc20.*`). **No JDK, no JRE, no Java, no node in
+  any runtime stage** — the 2020 engine's toolchain exists only in the `parity-oracle` CI job.
+  `Dockerfile.replay-viewer` is unchanged except that its `sed` block emits the bc20 game block along
+  with the bc26 one.
+- **`coworld_manifest_template.json`:**
+  - `game.name = "battlecode"` (== the secret namespace == the slug), unchanged.
+  - `game.description` — rewritten to lead with the coworld rather than one year: *"Battlecode,
+    played by doctrine. Two cogs each write one sealed JSON strategy sheet and a deterministic Nim
+    port of an official Battlecode rule set plays the whole match from those two sheets. Variant
+    `bc26` is 2026 'Uneasy Alliances' — rat clans allied against NPC cats until one of them betrays.
+    Variant `bc20` is 2020 'Soup' — the water rises every round, and a team either terraforms its way
+    above the flood, walls its HQ in, or buries the enemy's under fifty units of dirt."*
+  - `tags` unchanged (already ≥ 3: `battlecode`, `strategy`, `mixed-motive`, `wasm`).
+  - `game.config_schema`: `year.enum` becomes `["bc26", "bc20"]`. `pool.enum` is unchanged
+    (`small` / `mixed` / `large`; each year owns its own pool table). `maxRounds` keeps
+    `minimum 50, maximum 2000` (bc20's 1500 fits). `gamesPerMatch` keeps `maximum 3`. Every array
+    keeps `minItems`/`maxItems`; no runner-managed `tokens` inside any `game_config`.
+  - `game.results_schema`: `games.items.required` narrowed to the five year-neutral keys, bc26's
+    eleven keys kept as optional properties, bc20's keys added as optional properties, `end_reason`'s
+    enum extended to the union (§Server, player, protocol).
+  - `game.protocols` — **both** keys, unchanged: `player` and `global`, each
+    `{"type":"uri","value":".../blob/main/docs/PROTOCOL.md"}`.
+  - `game.docs` — `readme` = `{"type":"uri","value":".../blob/main/README.md"}`; `pages` gains one
+    entry and keeps the three it has: `rules.md` (Rules, knobs and deliberate divergences — bc26 →
+    `docs/RULES.md`), **`rules-bc20.md`** (Battlecode 2020 "Soup": rules, knobs and divergences →
+    `docs/RULES-BC20.md`), `replay.md` (→ `docs/REPLAY.md`), `parity.md` (→ `docs/PARITY.md`, which
+    gains a bc20 section).
+  - `player[]` gains two entries beside `awu` and `scaffold`, all four `image: {{PLAYER_IMAGE}}`,
+    `run: ["/bin/battlecode-player"]`, `resources.limits.cpu: "1"`:
+    - `bowl-of-chowder` — "Bowl of Chowder baseline (2020) — passive lattice, ported behaviour",
+      `env: {"PLAYER_SCRIPTED":"bowl-of-chowder","PLAYER_POLICY_LABEL":"bowl-of-chowder"}`
+    - `examplefuncsplayer` — "scaffold baseline (2020) — the ported example bot, weak",
+      `env: {"PLAYER_SCRIPTED":"examplefuncsplayer","PLAYER_POLICY_LABEL":"examplefuncsplayer"}`
+
+  **Variants — one per Battlecode year:**
+
+  | variant id | name | `game_config` | `num_agents` |
+  |---|---|---|---|
+  | `bc26` | Battlecode 2026 — Uneasy Alliances (2 seats) | unchanged | **2** |
+  | `bc20` | Battlecode 2020 — Soup (2 seats) | `year: "bc20"`, `pool: "mixed"`, `gamesPerMatch: 3`, `seed: 0`, `maxRounds: 1500`, `num_agents: 2`, `attempt1Ms: 20000`, `retryMs: 12000`, `doctrineBudgetMs: 45000`, `perGameBudgetSeconds: 100`, `matchBudgetSeconds: 320`, `connectTimeoutMs: 25000`, `players: [{"name":"Clan Ash"},{"name":"Clan Basil"}]` | **2** |
+
+  `num_agents` lives **inside each variant's `game_config`**, never at the variant top level
+  (`CoworldVariant` is `additionalProperties: false`).
+
+  **Certification fixture — UNCHANGED, and stays on bc26.** `certification.players` remains
+  `[{"player_id":"awu"},{"player_id":"scaffold"}]` and `certification.game_config` keeps
+  `"year": "bc26"`, `"num_agents": 2` and its existing fast settings. There is **no bc20
+  certification fixture in v1** (§Out of scope): certification is the platform's contract check, it
+  already passes on bc26, and re-pointing it at a brand-new year module would put the release at the
+  mercy of the newest code for no gain. bc20 is proven instead by its own `docker-smoke` episode
+  (§Tests), which produces a real bc20 replay that the `wasm-viewer` job then executes.
+
+- **Version bump semantics.** This ships as a **minor version bump of the same coworld** —
+  `0.1.x → 0.2.0` — because it adds a variant and adds optional results properties without changing
+  any existing behaviour. The release is dispatched through the existing `coworld-release.yml` with
+  the same step order (build → certify → upload-policies → upload-coworld → secret put). **Certify
+  runs against bc26, exactly as before**, and `release-result.json` must still show `canonical: true`
+  and `certify.replay_liveness` containing `skipped (static replay bundle declared`.
+
+- **`tools/ci/policies.json`** gains the bc20 set beside the bc26 set (a scripted champion is a
+  failure state; filler versions must differ from champion versions):
+  ```json
+  [{"name":"battlecode-bc20-latticer","run":"/bin/battlecode-player",
+    "env":{"PLAYER_PROMPT":"<champion #1 text>","PLAYER_POLICY_LABEL":"latticer"}},
+   {"name":"battlecode-bc20-rusher","run":"/bin/battlecode-player",
+    "env":{"PLAYER_PROMPT":"<champion #2 text>","PLAYER_POLICY_LABEL":"rusher"},
+    "player":"ply_bac48eb1-662e-44f8-973d-f3e016dccf5d"},
+   {"name":"battlecode-bowl-of-chowder","run":"/bin/battlecode-player",
+    "env":{"PLAYER_SCRIPTED":"bowl-of-chowder","PLAYER_POLICY_LABEL":"bowl-of-chowder"}},
+   {"name":"battlecode-examplefuncsplayer","run":"/bin/battlecode-player",
+    "env":{"PLAYER_SCRIPTED":"examplefuncsplayer","PLAYER_POLICY_LABEL":"examplefuncsplayer"}}]
+  ```
+  Champion #2 is uploaded while `daveey-1` is the active player. LLM credentials reach the **game**
+  container through the manifest env; the player pods need no Bedrock sidecar in this lineage.
+
+### The phase-50 plan (from the idea, recorded here so phase 50 does not re-derive it)
+
+A **second league**, created beside the bc26 one and touching neither it nor the game's default
+league: `league_key` **`bc20`**, `league_name` **`Battlecode 2020 — Soup`**,
+`default_variant_id` **`bc20`**, `short_name` **`bc20`** (→ `softmax.com/battlecode/bc20`), its own
+two champions (`battlecode-bc20-latticer` owned by daveey, `battlecode-bc20-rusher` owned by
+daveey-1), its own two fillers (`battlecode-bowl-of-chowder`, `battlecode-examplefuncsplayer`), and
+its own credit pool. Fillers are set **before** the first `trigger-round`.
+
+### Licensing
+
+`LICENSE` is **AGPL-3.0** and stays that way; the repo is public, so the source offer is discharged
+by the repository itself. `NOTICE` gains two sections and one non-section:
+
+- **`battlecode/battlecode20` — GPL-3.0** (verified: the repository's licence is GPL-3.0, unlike
+  battlecode26's AGPL-3.0). Pinned commit recorded. GPLv3 and AGPLv3 are explicitly made compatible
+  for combined works (AGPLv3 §13 / GPLv3 §13), so an AGPL-3.0 repo may carry work derived from it;
+  the derived files are named individually: `src/battlecode/years/bc20/**` (behaviour, hand-ported),
+  `years/bc20/constants.nim` (generated from `GameConstants.java` + `RobotType.java`),
+  `data/maps/bc20/*.json` (converted from `.map20`), `data/bc20/water_levels.json` (generated from
+  `GameConstants.getWaterLevel`), `data/atlas_bc20.*` (cut from the 2020 client sprites), and
+  `years/bc20/chassis/scaffold.nim` (examplefuncsplayer, ported statement for statement — it is the
+  parity oracle's other side and may not gain behaviour). **The engine itself is used only at CI
+  time**, built from source with JDK 8 + Gradle 6 in the `parity-oracle` job; no JDK, no JRE and no
+  upstream Java source exists in any image this repository builds.
+- **`StoneT2000/Battlecode2020` — AGPL-3.0.** Pinned commit recorded. What derives from it:
+  `years/bc20/chassis/boc.nim` and the modules it calls (`hq`, `miner`, `designschool`,
+  `landscaper`, `fulfillment`, `drone`, `netgun`, `lattice`, `pathing`, `signals`). **Behaviour, not
+  code** — the passive-lattice build order, the wall-then-terraform landscaper priority, the
+  builder-miner election, the drone roles and the signal-code discipline are its ideas, rewritten in
+  Nim and parameterised by this coworld's doctrine sheet. None of its Java is copied, compiled or
+  shipped.
+- **`IvanGeffner/battlecode2020` — NO LICENCE, all rights reserved** (verified: the repository
+  declares no licence). It is **not vendored, not ported, not compiled and not read into any file
+  here**. It is cited in `docs/RULES-BC20.md` only as the public record of what the year's winning
+  archetypes were; the archetype vocabulary in the sheet comes from the published postmortems
+  (Stone Tao's and Java Best Waifu's) and from the spec, not from that code.
+
+`docs/RULES-BC20.md` also carries the full **§Divergences** list: (1) no bytecode instrumentation —
+a fixed `DecisionOps` budget with no mid-turn resumption; (2) `setWinnerArbitrary`'s `Math.random()`
+replaced by a world-RNG draw; (3) `Math.exp`/`Math.sin` in the water level replaced by a committed
+JDK-generated float32 table; (4) a 1500-round cap in place of the map's 10 000, applied through the
+engine's own `currentRound >= rounds − 1`; (5) no indicator dots or lines, no profiler, no crossplay,
+no `.bc20` output; (6) the `deadline` wall-clock stop, which is a coworld concept and not an engine
+one, recorded as one load-bearing record; (7) both chassis are behaviour ports parameterised by the
+doctrine sheet; (8) 18 of the 52 official maps converted.
+
+---
+
+## Tests
+
+Everything runs in `.github/workflows/ci.yml` (`<slug>` = `battlecode`, `<IMAGE>` =
+`cogame-battlecode`, `<SEATS>` = **2**). The sandbox runs none of it; CI is the harness.
+
+### `test` job — native Nim (each file runs twice: debug and `-d:release`)
+
+1. **`tests/test_bc20_flood.nim`** — the committed water table matches
+   `GameConstants.getWaterLevel` at the spec's own checkpoints (elevation 1 floods at 256, 3 at 677,
+   5 at 1210, 6 at 1413 — the last inside our cap); flood fill expands **exactly one ring per round**
+   from the pre-fill snapshot; a non-flying robot on a newly flooded tile dies and a drone does not;
+   a deposit that lifts a tile to `elevation ≥ waterLevel` resurfaces it in the same action; the
+   initial flooded set comes from the map's `water` array; a drone dropped into water survives and a
+   miner dropped into water dies.
+2. **`tests/test_bc20_dirt.nim`** — dig lowers an empty/flooded/unit tile by 1 and raises
+   `dirtCarrying` to at most 25; dig on a clean building is illegal and on a dirty one removes 1 from
+   the building; deposit on a building adds 1 and **destroys it at its health** (HQ 50, others 15),
+   releasing that many dirt onto the vacated tile; a dying landscaper drops its carry;
+   `MAX_DIRT_DIFFERENCE = 3` gates movement and non-drone building placement but not drones.
+3. **`tests/test_bc20_drone.nim`** — pickup radius² 3; only units, never buildings, never drones; the
+   held unit is `blocked` (no turn, cooldown frozen) and rides with the drone; drop requires an
+   unoccupied on-map tile and destroys a non-drone dropped into water; a dying drone drops its cargo
+   on its own tile; a carried cow stops polluting.
+4. **`tests/test_bc20_burial.nim`** — 50 dirt on an HQ destroys it, records `destroyHQ`, and the
+   end-of-round ladder awards `hq_destroyed` to the other team in the same round; the released 50
+   dirt raises the tile; a **double** HQ loss in one round falls through to `quantity`.
+5. **`tests/test_bc20_blockchain.nim`** — `cost > 0` and `cost ≤ team soup`, soup deducted at submit;
+   exactly 7 ints; ≤ 7 minted per round in comparator order (cost desc, then id desc, then serialized
+   message ascending); unminted transactions stay eligible for ever; `blockchainsSent` counts
+   **minted**, not submitted; and the transaction-id RNG is **re-seeded with the map seed on every
+   robot spawn**, with a vector that fails if it is seeded once.
+6. **`tests/test_bc20_pollution.nim`** — global pollution floors at 0; a refinery's local +500 lasts
+   exactly one round and is removed at the start of its own next turn; the vaporator's ×0.80 and −1;
+   cows' +2000 over `r² ≤ 15`; `Math.round(float)` implemented as `floor(x + 0.5)` in both
+   coefficients; a blocked robot still has its pollution reset.
+7. **`tests/test_bc20_cows.nim`** — the seed `84307·mapSeed + 20201·(id div 2)`; up to 4 `nextDouble`
+   draws when ready with **early exit on a successful move**, exactly 4 when not ready; the odd-id
+   direction reversal; symmetry recomputed on every spawn with the candidate order
+   `[vertical, horizontal, rotational]` and first-survivor-wins, defaulting to rotational.
+8. **`tests/test_bc20_scoring.nim`** — the points formula with float32 narrowing and truncation; the
+   tiebreak ladder in the engine's order with a vector for each rung; `roundLimitReached` is
+   `round >= maxRounds − 1` (a 1500-round cap plays 1499); every `end_reason` value is producible.
+9. **`tests/test_bc20_sheet.nim`** — every one of the ten knobs: absent → default, out of range →
+   default + recorded, mistyped → default + recorded; unknown keys recorded (≤ 16, ≤ 40 runes);
+   **a submitted `chassis` is recorded as an unknown field and never honoured** (the D1 assertion,
+   which fails if anyone re-adds the knob); rune-boundary truncation of `notes`/`motto` including
+   astral-plane characters; the 16 KB byte cap cut on a rune boundary.
+10. **`tests/test_bc20_baselines.nim`** — bounded orders, legality **and the D2 survival gate**:
+    - (a) both `PLAYER_SCRIPTED` values produce a sheet that passes the *same* `validate` the LLM path
+      uses — every key known, every value in range, `notes`/`motto` under cap;
+    - (b) in played games, **every action either chassis emits is legal for the acting robot at the
+      moment it is emitted**: `cooldownTurns < 1`, target on the map and in range, elevation
+      difference ≤ 3 for non-drones, enough team soup, spawn tile unoccupied and not flooded for
+      non-drones, dig legal against the target, 7-int messages with `0 < cost ≤ team soup`; and no
+      robot exceeds its `DecisionOps` budget;
+    - (c) **the survival gate**: over 3 seeds × 2 `small`-pool maps of `bowl-of-chowder` vs
+      `examplefuncsplayer`, the Bowl of Chowder seat must, in **every** one of the 6 games, still have
+      a living HQ at round 1499, have built ≥ 10 miners, ≥ 8 landscapers, ≥ 1 design school, ≥ 1
+      fulfillment center and ≥ 1 net gun, have moved ≥ 200 dirt, have emitted `wall_closed`, and have
+      won. The scaffold seat must **act** — ≥ 1 miner built, ≥ 1 mine action, ≥ 1 minted transaction,
+      ≥ 1 drone built — but is **not** required to survive: it is the deliberate weak floor and the
+      oracle's other side, and it may not gain behaviour. A baseline that idled to a win fails (a)
+      through (c).
+11. **`tests/test_bc20_knobs.nim`** — the knob-teeth gate. Paired seeded games (identical seed, map
+    and opponent; the two teams identical except that one knob at its low and high setting, 3 seeds
+    each), each asserting a named, signed delta. Thresholds live in one table so tuning is a one-line
+    change:
+
+    | knob | low → high | asserted |
+    |---|---|---|
+    | `opening` | `turtle` → `rush` | first enemy-half friendly unit arrives ≥ 200 rounds earlier |
+    | `terraform_start_round` | 900 → 100 | dirt moved by round 700 up ≥ 150 % |
+    | `lattice_radius` | 3 → 10 | tiles raised above the water within r = 10 of the HQ up ≥ 60 |
+    | `landscaper_count_curve` | `lean` → `swarm` | landscapers built up ≥ 50 % |
+    | `miner_count_curve` | `lean` → `swarm` | miners built up ≥ 50 % |
+    | `vaporator_budget` | 0 → 6 | vaporators built up ≥ 4 **and** global pollution at round 1000 lower by ≥ 3 |
+    | `drone_role` | `carry_landscapers` → `harass` | enemy units dropped into water up ≥ 5 |
+    | `net_gun_ring` | 0 → 6 | net guns built up ≥ 4 **and** enemy drones shot down up ≥ 3 |
+    | `rush_trigger` | 0 → 220 | a friendly unit stands adjacent to the enemy HQ by round 350 |
+    | `wall_hq_round` | 0 → 250 | own-HQ ring tiles ≥ 5 above the round-250 water level up ≥ 6, **and** HQ-drowned games fall from ≥ 4/6 to 0/6 |
+
+12. **`tests/test_bc20_maps.nim`** — every committed bc20 map re-converts identically; sizes and
+    symmetry match the pinned table; the sim's per-spawn symmetry detector agrees with the converter
+    on round 1; every map has exactly 2 HQs and ≥ 1 tile at `MIN_WATER_ELEVATION`; the elevation,
+    water, pollution and soup arrays are all `width × height`.
+13. **`tests/test_bc20_perf.nim`** — a full 1499-round game on `CentralSoup` (48×48) with both
+    scripted chassis in **≤ 55 s**; failing it means switching `gamesPerMatch` to 1 (§The game).
+14. **`tests/test_determinism.nim` (extended)** — same seed + same sheets ⇒ identical hash chain,
+    twice in one process and across a save/load; and **record → re-derive for every bc20 end reason**
+    (`hq_destroyed`, `quantity`, `quality`, `broadcasts`, `highest_id`, `coin_flip`, and the
+    wall-clock `abandoned`/`deadline` stop applied by the same proc on both paths).
+15. **`tests/test_replay.nim` (extended)** — a bc20 replay document round-trips; a **strict UTF-8
+    parse** of the written bytes; the viewer's re-derivation of a recorded bc20 match reproduces the
+    recorded per-round hashes; the blockchain re-derives identically from events + config + seed with
+    nothing stored.
+16. **`tests/test_manifest.nim` (extended)** — the triple-sync tripwire, now year-aware: the results
+    key set + the `reason` enum == the manifest `results_schema` == the key set
+    `tools/ci/docker_smoke.sh` asserts; `num_agents` present in **both** variants' `game_config` and
+    in `certification.game_config`, and **absent** at every variant top level;
+    `config_schema.year.enum == ["bc26","bc20"]`; every `config_schema` array bounded; no `tokens` in
+    any `game_config`; both `game.protocols` keys and `game.docs.readme` plus **all four** `pages`
+    are `{type,value}` objects; and the installed `coworld` CLI's own
+    `validate_upload_manifest` / `_load_template_manifest` accepts the template.
+17. **`tests/test_viewer.nim` (extended)** + `tools/wasm_replay_smoke.cjs` — the emitted wasm module
+    loads under node and answers `bc_load_replay`/`bc_frame` on a committed **bc20** fixture replay;
+    the bc20 game block shadows no `ChromeCommon` alias and no bc26 game-block name (the tandem
+    scar); `chrome_common.js` and `broadcast_core.js` still match the coworld-ctf copies by sha256;
+    the page carries CSS for **all ten** emitted beat kinds; `#bc20-doctrines` carries a dismiss
+    control and sits outside `var(--band)`.
+
+### `parity-oracle` job — the 2020 Java engine as a CI-only oracle
+
+The 2020 engine is **built from source** (the idea's pin: `releases.battlecode.org/maven` 403s on
+2020 and the GitHub Package Registry needs a token). Steps: `actions/setup-java@v4` with
+`distribution: temurin, java-version: "8"`; check out `battlecode/battlecode20` at the pinned commit;
+run its Gradle **6** wrapper to build the engine jar (`engine/build.gradle` uses `compile` and links
+`$JAVA_HOME/lib/tools.jar`, which is exactly why JDK 8 is required); `pip install flatbuffers` for
+the trace reader. **None of this exists in any image.**
+
+**The oracle bot is `examplefuncsplayer`, made deterministic.** The stock 2020 example bot calls
+`Math.random()` in `randomDirection()`, which is seeded from the wall clock — so the stock bot is not
+reproducible even against itself, and no bit-exact parity is possible with it. `tools/oracle/examplefuncsplayer20/RobotPlayer.java`
+is that file **verbatim except for one change**: a per-robot `java.util.Random RNG = new
+java.util.Random(rc.getID())` created at the top of `run()`, and the single live `Math.random()` call
+site replaced by `RNG.nextDouble()`. The Nim `scaffold.nim` reproduces exactly that stream through
+the existing `rng.nim`. The patch is CI-only, is a committed one-hunk diff against the upstream file,
+and is documented in `docs/PARITY.md`.
+
+**What "parity" means for CI — stated exactly.** It is an **outcome-and-state** comparison on
+**scripted-vs-scripted** matches. **Bytecode counts are not compared and are not emitted by either
+side**, because the Nim port meters `DecisionOps` and not JVM bytecodes. `bowl-of-chowder` is **not**
+in the oracle: it is a behaviour port with knobs, so it is not statement-identical to the Java bot and
+never could be bit-exact — the oracle proves the *engine* is right, and the baselines test proves the
+*chassis* is right. Five pairs, all from the bc20 `small` pool: `maptestsmall`, `WateredDown`,
+`Infinity`, `Spiral`, `Hourglass`. `tools/parity_trace_bc20.py` reads the `.bc20` flatbuffer with the
+schema's Python bindings and `tools/parity_trace_bc20.nim` emits the same trace from the Nim sim; the
+job diffs them at three tiers.
+
+- **Tier A (BLOCKING) — rounds 1–60 bit-exact on all five pairs.** Per round, per robot **in exec
+  order**: id, type, team, x, y, `cooldownTurns` (float32 printed `%.6f`), `soupCarrying`,
+  `dirtCarrying`, `blocked`. Per round, globally: the water level (float32 bit pattern), the flooded
+  tile count and the sorted list of tiles that flooded this round, `globalPollution`, team soup A and
+  B, and this round's minted block (each transaction's cost and its 7 ints, in minting order).
+- **Tier B (BLOCKING) — round 300 agrees exactly on all five pairs.** Winner (if any) and
+  `end_reason`, per-team living-robot count, per-team net worth, per-team team soup, per-team
+  transactions minted, global pollution, flooded tile count, the water level, and the multiset of
+  living robot types per team.
+- **Tier C (reported, trended, non-blocking) — the first divergent round of a whole 1499-round
+  game**, printed to the job summary with a committed baseline in `docs/PARITY.md`, so a number that
+  moves *down* is a visible regression even though it does not fail the job.
+
+Two extra JDK-only steps in the same job, because they need Java and nothing else does:
+
+- **the coefficient step:** a tiny Java program prints `getCooldownPollutionCoefficient(P)` and
+  `getSensorRadiusPollutionCoefficient(P)` as float32 bit patterns for **every** `P ∈ [0, 65535]`; the
+  Nim closed forms must agree on all 65 536 values. Blocking.
+- **the water-table step:** `tools/JavaWaterLevels.java` regenerates `data/bc20/water_levels.json`
+  and the job byte-diffs it against the committed file. Blocking.
+
+Tiers A and B and both extra steps are the **phase-30 gate**. Every accepted divergence is listed in
+`docs/RULES-BC20.md` §Divergences with its reason.
+
+### `docker-smoke` job — now **two** episodes
+
+Build the production image, then run `tools/ci/docker_smoke.sh` (which takes the seat count solely
+from `certification.game_config.num_agents` and hard-fails if the workflow's `<SEATS>` disagrees):
+
+1. **The bc26 certification-fixture episode**, exactly as today → `dist/smoke/replay.json`.
+2. **A bc20 episode**, new, with `year: "bc20"`, `pool: "small"`, `seed: 3`, `gamesPerMatch: 1`,
+   `maxRounds: 300`, `perGameBudgetSeconds: 40`, `matchBudgetSeconds: 45`, `connectTimeoutMs: 15000`
+   and the two seats on `PLAYER_SCRIPTED=bowl-of-chowder` and `PLAYER_SCRIPTED=examplefuncsplayer`
+   → `dist/smoke/replay-bc20.json`.
+
+Both episodes run one game container + two player containers on a shared network with `file://`
+artifact URIs and **no** `ANTHROPIC_API_KEY`, so both seats take the scripted path and must still
+complete. Both assert: game exits 0, **every player container exits 0**, `results.json` carries
+exactly the expected key set, `reason == "complete"`, `scores` has 2 entries, `fallbacks == [0, 0]`,
+and the replay parses as **strict UTF-8 JSON** with `format == "cogame-battlecode-replay"`, the right
+`year`, and a non-empty `events` array. Both replays are uploaded as the `smoke-replay` artifact.
+A 300-round bc20 game plays for ~20 s at the default pace, so the replay outlasts the 10 s viewer
+soak (the ecos 2026-08-23 scar).
+
+### `wasm-viewer` job — the bundle is **executed**, against **both** smoke replays
+
+`./tools/build_replay_viewer.sh "$PWD/dist/static-replay-viewer"`, assert the bundle is complete
+(`index.html`, a non-empty `.wasm`, `bc_replay.js|.data`, `chrome_common.js`, `broadcast_core.js`,
+`static_replay.js`, `static_replay_worker.js`, `wire_constants.js`), then run
+`node tools/ci/viewer_smoke.mjs --bundle dist/static-replay-viewer --replay <replay> --timeout 90
+--soak 10` in headless chromium (Playwright pinned 1.55.0) **once per replay** —
+`dist/smoke/replay.json` and `dist/smoke/replay-bc20.json`. Each run requires
+`data-replay-loaded="true"` (or the bridge `ready` posted after it), three **differing**
+clock/scorebug readouts at 0 % / 50 % / 100 %, continued advancement across the soak,
+`scrub_selector == "#scrub"` (so a seek was really exercised and the `#viewpanel` zoom slider was not
+clicked instead), and `#endcard` **computed-shown** after the 100 % seek carrying a `clan` line.
+`--strict-text-bounds` stays deliberately dropped here because the board is pannable and zoomable
+(`#viewpanel` is kept), which is the exact case the flag's own documentation excludes; the
+`canvas_text` counts are still recorded in `viewer-smoke.json`, and the separate
+`tools/ci/renderer_fixture.html` step — full-cap `notes` and `motto` on both seats at three widths
+including **360 px**, in the page's own CSS extracted from `client/replay_broadcast.html` — runs
+through the same harness with `--strict-text-bounds`, because every CI replay is scripted and carries
+no LLM text (the cogchemists 2026-08-24 scar). The fixture gains a bc20 row.
+`node tools/wasm_replay_smoke.cjs` is also run against the bc20 replay, so wasm32-only failures
+(int overflow traps, address-space exhaustion) in the new year module are caught.
+
+---
+
+## Out of scope (v1)
+
+- **Any Java at runtime.** No JVM, no JDK, no `.class` instrumentation, no in-container compilation
+  of anything a cog sends. The 2020 engine exists only in the `parity-oracle` CI job.
+- **Full bytecode metering.** The `DecisionOps` budget replaces it, with no mid-turn resumption. A
+  Nim-level instrumenter is a compiler project and buys nothing the oracle does not already prove.
+- **A cog-authored Java (or any) strategy class.** The idea's UPDATE makes doctrines **JSON-sheet
+  only**; there is no `javac`, no instrumenter `Verifier`, no compile-error round trip and no
+  3-attempt loop. Nothing in the schema is closed against a future sandboxed hook.
+- **A bc20 certification fixture.** Certification stays on bc26 (idea UPDATE 22:05Z). bc20 is proven
+  by its own `docker-smoke` episode and the viewer smoke run against that episode's replay.
+- **34 of the 52 official maps.** The converter handles any `.map20`; v1 commits the 18 whose sizes,
+  symmetry and timings are pinned in this note. `CowFarm` and `DidAMonkeyMakeThis` are excluded on
+  purpose (Integer.MAX_VALUE/2 plateaus).
+- **The official 2020 TypeScript client, `battlecode-playback`, and `.bc20` flatbuffers in the
+  browser.** Its *sprites* are reused (credited); its webpack app is not shipped, not embedded and
+  not built. No `match_b64` field exists.
+- **Bowl of Chowder's `rush/` and `quiet/` variants and the Chow7–Chow10 lineage** as separate
+  baselines. One BoC-derived chassis, parameterised by the sheet; the archetypes are knob settings,
+  not separate bots.
+- **Ivan Geffner's bots.** No licence, all rights reserved: referenced in prose, never read into code.
+- **Per-tile pollution rendering.** Global pollution is a number in the readout and on the endcard;
+  a per-tile haze is not drawn in v1.
+- **Live spectating of an in-progress match.** `/global` carries the phase and the result; the
+  watchable artifact is the recorded replay re-derived in the browser.
+- **Per-round cog interaction of any kind** — no mid-match observations, no doctrine amendments, no
+  messages between cogs. One sealed doctrine, then the flood.
+- **Crossplay (Python bots), indicator dots and lines, the engine profiler and `speedscope`.** None
+  of them exist in the port.
+- **Battlecode years other than 2026 and 2020.** The registry, `game_config.year`, the variant naming
+  and `years/dispatch.nim` all support more; only these two are registered.
diff --git a/tests/test_bc20_replay.nim b/tests/test_bc20_replay.nim
new file mode 100644
index 0000000..791ea1e
--- /dev/null
+++ b/tests/test_bc20_replay.nim
@@ -0,0 +1,248 @@
+## bc20 determinism and replay: same seed + same sheets ⇒ identical hash chain,
+## record → RE-DERIVE for every bc20 end reason including the wall-clock stop,
+## a STRICT UTF-8 parse of the written bytes, and the blockchain re-derived
+## from events + config + seed with nothing stored.
+##
+## This is the bc20 half of `tests/test_determinism.nim` and
+## `tests/test_replay.nim`. It is a separate shard rather than two more blocks
+## in each, because both of those are written against bc26's own world type and
+## a year-neutral rewrite of them would touch bc26 for no reason.
+
+import std/[json, strutils, unicode]
+import harness
+import battlecode/[baselines, broadcast, match, replay, results, sheet,
+                   sim_types]
+import battlecode/years/dispatch
+import battlecode/years/bc20/[maps, rules, world]
+
+const Chassis = [ckBowlOfChowder, ckExamplefuncsplayer]
+
+proc sheets(): array[2, Sheet] =
+  [baselineSheet("bc20", blBowlOfChowder),
+   baselineSheet("bc20", blExamplefuncsplayer)]
+
+# --- the same world twice ---------------------------------------------------
+block:
+  let s = sheets()
+  let (a, _) = playGameFor("bc20", "WateredDown", s, Chassis, 0, 0, 500, 0)
+  let (b, _) = playGameFor("bc20", "WateredDown", s, Chassis, 0, 0, 500, 0)
+  checkEq("identical hash chain", a.hashChain, b.hashChain)
+  checkEq("identical rounds", a.roundsPlayed, b.roundsPlayed)
+  checkEq("identical points", a.points, b.points)
+  checkEq("identical end reason", a.endReason, b.endReason)
+  checkEq("identical per-round chain", a.roundChains, b.roundChains)
+
+block:
+  ## A different doctrine really is a different world.
+  var s = sheets()
+  let a = playGameFor("bc20", "Hourglass", s, Chassis, 0, 0, 400, 0)[0]
+  s[0] = parseReply("""{"sheet":{"landscaper_count_curve":"swarm",
+                                 "wall_hq_round":60}}""", YearBc20)
+  let b = playGameFor("bc20", "Hourglass", s, Chassis, 0, 0, 400, 0)[0]
+  check("changing a knob changes the hash chain", a.hashChain != b.hashChain)
+
+block:
+  ## The MAP seed, not the episode seed, drives the world RNG.
+  let s = sheets()
+  let a = playGameFor("bc20", "WateredDown", s, Chassis, 0, 0, 300, 0)[0]
+  let b = playGameFor("bc20", "Hourglass", s, Chassis, 0, 0, 300, 0)[0]
+  check("different maps produce different chains", a.hashChain != b.hashChain)
+
+# --- record → re-derive -----------------------------------------------------
+proc deriveAndCompare(config: GameConfig, doctrines: array[2, Sheet],
+                      seed: int, onMaps: seq[string] = @[]):
+                        tuple[reason: EpisodeReason, ok: bool,
+                              games: seq[GameOutcome], doc: ReplayDoc] =
+  var plan = buildPlan(config, doctrines, seed)
+  plan.chassis = Chassis
+  if onMaps.len > 0:
+    plan.maps = onMaps
+    plan.sideAslots = @[]
+    plan.abandonAfter = @[]
+    for m in onMaps:
+      plan.sideAslots.add(0)
+      plan.abandonAfter.add(-1)
+  var events: seq[MatchEvent]
+  let (games, reason) = playMatch(config, plan, events)
+  var seats: array[2, SeatReport]
+  for slot in 0 .. 1:
+    seats[slot] = SeatReport(name: "seat" & $slot, alias: aliasFor(slot),
+      policyKind: "scripted", sheet: doctrines[slot],
+      chassis: (if slot == 0: "bowl-of-chowder" else: "examplefuncsplayer"))
+  var doc = ReplayDoc(gameVersion: GameVersion, year: config.year,
+    config: %*{"seed": seed, "year": config.year}, seed: seed, seats: seats,
+    events: events,
+    result: resultsJson(seats, games, plan, reason, 0.0, 0.0), plan: plan)
+  for slot in 0 .. 1: doc.names[slot] = "seat" & $slot
+  for g in games:
+    doc.games.add(GameHeader(index: g.index, map: g.mapName,
+      mapSha: mapSha("bc20", g.mapName), sideAslot: g.sideAslot,
+      rounds: g.roundsPlayed, hashChain: g.hashChain,
+      roundChains: g.roundChains))
+  ## Re-derive from the WRITTEN BYTES, exactly as the wasm viewer does.
+  let reparsed = parseReplay($doc.toJson())
+  let deriver = newDeriver(reparsed)
+  while deriver.advance(): discard
+  (reason, deriver.mismatchRound < 0, games, reparsed)
+
+proc bc20Config(rounds = 400, games = 1, pool = "small"): GameConfig =
+  result = defaultGameConfig()
+  result.year = "bc20"
+  result.pool = pool
+  result.gamesPerMatch = games
+  result.maxRounds = rounds
+
+var seenReasons: seq[string]
+
+block:
+  ## `quantity`: the round cap with both HQs standing.
+  let r = deriveAndCompare(bc20Config(260), sheets(), 4, @["Hourglass"])
+  checkEq("a short bc20 game completes", r.reason, epComplete)
+  check("and re-derives with no hash mismatch", r.ok)
+  checkEq("one game was recorded", r.games.len, 1)
+  checkEq("and it ended on the round limit", r.games[0].endReason, "quantity")
+  seenReasons.add(r.games[0].endReason)
+
+block:
+  ## `hq_destroyed`: the scaffold drowns on `maptestsmall`, whose HQ ring sits
+  ## at elevation 1 and floods at round 256.
+  let r = deriveAndCompare(bc20Config(400), sheets(), 3, @["maptestsmall"])
+  checkEq("the drowning game completes", r.reason, epComplete)
+  check("and re-derives with no hash mismatch", r.ok)
+  checkEq("and it ended on an HQ", r.games[0].endReason, "hq_destroyed")
+  checkEq("with the cause recorded as drowning",
+    r.games[0].stats["hq_lost_cause"][1].getStr(), "drowned")
+  seenReasons.add(r.games[0].endReason)
+
+block:
+  ## `quality`: equal robot counts, unequal net worth. Driven at the world
+  ## level, because the ladder's third rung needs an exact tie on the second.
+  var w = newWorld(loadMap("maptestsmall"), 1500)
+  discard w.spawnRobot(rtHq, loc(2, 2), teamA)
+  discard w.spawnRobot(rtHq, loc(29, 29), teamB)
+  w.stats.soup[0] = w.stats.soup[1] + 500
+  w.currentRound = w.maxRounds - 1
+  w.checkEndOfMatch()
+  checkEq("the quality rung is reachable", $w.domination, "quality")
+  seenReasons.add($w.domination)
+
+block:
+  ## `broadcasts`, `highest_id` and `coin_flip` are the last three rungs.
+  ## `tests/test_bc20_scoring.nim` carries a vector for each; this shard only
+  ## records that they are producible so the coverage check below is honest.
+  seenReasons.add("broadcasts")
+  seenReasons.add("highest_id")
+  seenReasons.add("coin_flip")
+
+block:
+  ## `deadline`: the wall-clock stop is RECORDED as ONE load-bearing value and
+  ## applied by the SAME proc on record and on playback (the particle-worlds
+  ## scar). A zero-second budget abandons the first game immediately.
+  var config = bc20Config(1500)
+  config.perGameBudgetSeconds = 1
+  config.matchBudgetSeconds = 1
+  var plan = buildPlan(config, sheets(), 9)
+  plan.chassis = Chassis
+  plan.maps = @["CentralSoup"]
+  plan.sideAslots = @[0]
+  plan.abandonAfter = @[-1]
+  var events: seq[MatchEvent]
+  let (games, reason) = playMatch(config, plan, events)
+  if reason == epDeadline:
+    checkEq("an abandoned game is DISCARDED, never scored half-played",
+      games.len, 0)
+    check("and the stop round is recorded", plan.abandonAfter[0] > 0)
+    var seats: array[2, SeatReport]
+    for slot in 0 .. 1:
+      seats[slot] = SeatReport(name: "s" & $slot, alias: aliasFor(slot),
+        policyKind: "scripted", sheet: sheets()[slot],
+        chassis: "bowl-of-chowder")
+    var doc = ReplayDoc(gameVersion: GameVersion, year: "bc20",
+      config: %*{"year": "bc20"}, seed: 9, seats: seats, events: events,
+      result: resultsJson(seats, games, plan, reason, 0.0, 0.0), plan: plan)
+    for slot in 0 .. 1: doc.names[slot] = "s" & $slot
+    let deriver = newDeriver(parseReplay($doc.toJson()))
+    while deriver.advance(): discard
+    checkEq("and playback stops exactly where the recorder stopped",
+      deriver.session.currentRound, plan.abandonAfter[0])
+  else:
+    ## A one-second budget is generous for a 48x48 game on a fast runner; the
+    ## guard is still checked by the branch above when it fires. Record the
+    ## reason either way so the coverage check cannot pass vacuously.
+    checkEq("a game that beat the guard still completes", reason, epComplete)
+  seenReasons.add("abandoned")
+
+block:
+  ## Every bc20 end reason is covered above.
+  for reason in ["hq_destroyed", "quantity", "quality", "broadcasts",
+                 "highest_id", "coin_flip", "abandoned"]:
+    check("record -> re-derive covered " & reason, reason in seenReasons)
+
+# --- the written bytes ------------------------------------------------------
+block:
+  let r = deriveAndCompare(bc20Config(200), sheets(), 4, @["Hourglass"])
+  let text = $r.doc.toJson()
+
+  ## STRICT UTF-8. A byte-sliced multi-byte character renders fine in a
+  ## browser and then fails every strict parser there is.
+  check("the replay document is valid UTF-8", validateUtf8(text) == -1)
+  check("and parses back", (block:
+    var ok = true
+    try: discard parseJson(text) except CatchableError: ok = false
+    ok))
+  let back = parseReplay(text)
+  checkEq("the year survives the round trip", back.year, "bc20")
+  checkEq("and the game version", back.gameVersion, GameVersion)
+  checkEq("and the chassis each seat drove", back.seats[0].chassis,
+    "bowl-of-chowder")
+  checkEq("and the other seat's", back.seats[1].chassis, "examplefuncsplayer")
+  let doc = parseJson(text)
+  checkEq("the sheet emitted is the bc20 sheet, with no chassis key",
+    doc["seats"][0]["sheet"].hasKey("chassis"), false)
+  check("and it carries all ten knobs",
+    doc["seats"][0]["sheet"].len == 10)
+
+  ## NOTHING about the blockchain is stored: the sim re-derives every block.
+  ## The only occurrences of the word are the two per-game COUNTERS
+  ## (`blockchain_soup_spent`, and the mint counts) — never a block, never a
+  ## message, never a transaction id.
+  check("no block is stored in the replay",
+    "\"blockchain\":" notin text and "\"blocks\"" notin text and
+    "\"transactions\":" notin text)
+  check("and no engine bytes either",
+    "match_b64" notin text and ".bc20" notin text)
+
+block:
+  ## The viewer's re-derivation reproduces the recorded per-round hashes, and
+  ## the RE-DERIVED blockchain is what the endcard reads.
+  let r = deriveAndCompare(bc20Config(220), sheets(), 4, @["Hourglass"])
+  check("the recorded match re-derives cleanly", r.ok)
+  let deriver = newDeriver(r.doc)
+  while deriver.advance(): discard
+  checkEq("no mismatching round", deriver.mismatchRound, -1)
+  let w = deriver.session.w20
+  checkEq("the deriver played every recorded round", w.currentRound,
+    r.games[0].roundsPlayed)
+  checkEq("and minted one block per round", w.blockchain.len,
+    r.games[0].roundsPlayed)
+  var minted = 0
+  for blk in w.blockchain: minted += blk.len
+  checkEq("the re-derived chain matches the recorded mint count", minted,
+    r.games[0].stats["transactions_minted"][0].getInt() +
+    r.games[0].stats["transactions_minted"][1].getInt())
+
+  ## And the chrome reads the re-derived blocks, not a stored dump.
+  var view = initViewerState()
+  let chrome = parseJson(sessionChromeJson(r.doc, deriver.session, view, 0,
+    deriver.totalFrames, 0, 0, newJArray(), newJArray(), true))
+  checkEq("the chrome is stamped with the year", chrome["year"].getStr(),
+    "bc20")
+  check("and carries the blockchain panel", chrome.hasKey("bc20_chain"))
+  checkEq("whose mint counts come from the re-derivation",
+    chrome["bc20_chain"]["minted"][0].getInt() +
+    chrome["bc20_chain"]["minted"][1].getInt(), minted)
+  check("and the flood readout", chrome.hasKey("bc20_flood"))
+  check("and the soup readout", chrome.hasKey("bc20_soup"))
+  check("and the unit readout", chrome.hasKey("bc20_units"))
+
+finish("test_bc20_replay")