From 9c10a48d66a04c703800e31883ea09784e7107bd Mon Sep 17 00:00:00 2001
From: Theodore Turocy <ted.turocy@gmail.com>
Date: Tue, 28 Jul 2026 13:55:01 -0400
Subject: [PATCH] Added missing guards against games of imperfect recall in
 enumpoly.

Closes #1006.
---
 src/solvers/enumpoly/efgpoly.cc | 5 +++++
 src/solvers/enumpoly/nfgpoly.cc | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/src/solvers/enumpoly/efgpoly.cc b/src/solvers/enumpoly/efgpoly.cc
index 99cd21e35..3a0e1029e 100644
--- a/src/solvers/enumpoly/efgpoly.cc
+++ b/src/solvers/enumpoly/efgpoly.cc
@@ -227,6 +227,11 @@ EnumPolyBehaviorSolve(const Game &p_game, int p_stopAfter, double p_maxregret,
                       BehaviorCallbackType<double> p_onEquilibrium,
                       EnumPolyEventCallbackType<BehaviorSupportProfile> p_onEvent)
 {
+  if (!p_game->IsPerfectRecall()) {
+    throw UndefinedException(
+        "Computing equilibria of games with imperfect recall is not supported.");
+  }
+
   const double scale = p_game->GetMaxPayoff() - p_game->GetMinPayoff();
   if (scale != 0.0) {
     p_maxregret *= scale;
diff --git a/src/solvers/enumpoly/nfgpoly.cc b/src/solvers/enumpoly/nfgpoly.cc
index 3eff45f54..4340d734b 100644
--- a/src/solvers/enumpoly/nfgpoly.cc
+++ b/src/solvers/enumpoly/nfgpoly.cc
@@ -143,6 +143,11 @@ EnumPolyStrategySolve(const Game &p_game, int p_stopAfter, double p_maxregret,
                       StrategyCallbackType<double> p_onEquilibrium,
                       EnumPolyEventCallbackType<StrategySupportProfile> p_onEvent)
 {
+  if (!p_game->IsPerfectRecall()) {
+    throw UndefinedException(
+        "Computing equilibria of games with imperfect recall is not supported.");
+  }
+
   const double scale = p_game->GetMaxPayoff() - p_game->GetMinPayoff();
   if (scale != 0.0) {
     p_maxregret *= scale;