Update multi_agent.py

multi_agent.py

@@ -38,7 +38,7 @@ class MultiAgent:
                f"{chess.SQUARE_NAMES[move.from_square]} to "\
                f"{chess.SQUARE_NAMES[move.to_square]}."
     
-    def check_made_move(msg):
+    def check_made_move(self, msg):
         global made_move
         
         if made_move: