handle weird comments in puzzles

ChessBot-Dataset.py

@@ -70,18 +70,23 @@ class ChessPGNDataset(GeneratorBasedBuilder):
         parts = comment.split()
         if not parts:
             return None, -1
-        # First token must be a number
+        # First token must be a number in [-1, 1]
         first = parts[0]
         try:
             q_val = float(first)
         except ValueError:
             return None, -1
+        if not (-1.0 <= q_val <= 1.0):
+            return None, -1
         if len(parts) < 2:
             return q_val, -1
-        # Second token is a UCI best move — must be legal
-        best_move = chess.Move.from_uci(parts[1])
-        assert best_move in board.legal_moves, \
-            f"best move {parts[1]} not legal in {board.fen()}"
+        # Second token is a UCI best move — must be valid and legal
+        try:
+            best_move = chess.Move.from_uci(parts[1])
+            if best_move not in board.legal_moves:
+                return q_val, -1
+        except Exception:
+            return q_val, -1
         best_action = int(ChessEnv.move_to_action(best_move))
         return q_val, best_action