diff --git a/training/evaluate.py b/training/evaluate.py
index ec665e9f..786fdbe4 100644
--- a/training/evaluate.py
+++ b/training/evaluate.py
@@ -82,6 +82,8 @@ def evaluate_pair(
     """Replay one seeded state sequence with the models on opposite sides."""
     if episodes < 2 or episodes % 2 != 0:
         raise ValueError("--episodes must be an even number of at least 2 for paired side swaps")
+    if team_size not in (1, 2):
+        raise ValueError("team_size must be 1 or 2")
 
     episodes_per_side = episodes // 2
     first = run_half(
diff --git a/training/test_evaluate.py b/training/test_evaluate.py
index 55b5fe46..ae6736a0 100644
--- a/training/test_evaluate.py
+++ b/training/test_evaluate.py
@@ -45,6 +45,15 @@ class EvaluatePairTests(unittest.TestCase):
     def test_rejects_unsupported_team_size_before_launch(self) -> None:
         with self.assertRaisesRegex(ValueError, "team_size must be 1 or 2"):
             evaluate.run_half("godot", "a", "b", 2, 16, 1, team_size=3)
+        with self.assertRaisesRegex(ValueError, "team_size must be 1 or 2"):
+            evaluate.evaluate_pair("godot", "a", "b", 2, 16, 1, team_size=3)
+
+    @patch("evaluate.subprocess.run")
+    def test_2v2_run_passes_team_size_to_godot(self, run_process) -> None:
+        run_process.return_value.stdout = 'EVAL_RESULT {"episodes": 2, "goals_a": 1, "goals_b": 0, "draws": 1}\n'
+        evaluate.run_half("godot", "a", "b", 2, 16, 9, team_size=2)
+        command = run_process.call_args.args[0]
+        self.assertIn("--eval_team_size=2", command)
 
     @patch("evaluate.run_half")
     def test_2v2_evaluation_preserves_side_swap_and_team_size(self, run_half) -> None: