Update app.py

app.py

@@ -24,7 +24,7 @@ Board:
 Strategy:
 1. Identify taken positions, and empty positions.
 2. Find and execute winning moves.
-3. If There isn't a winning move, then block your opponent’s potential wins.
+3. If There isn't a winning move, then block your opponent's potential wins.
 4. Control the center and set up future moves.
 
 Respond in XML:
@@ -207,9 +207,24 @@ class ConnectFour:
                     moves.append(f"{col_letter}{row_num}({piece})")
         return ", ".join(moves) if moves else "Empty Board"
 
+    def get_board_moves(self):
+        """
+        Returns a list of all moves made in the game in the format 'a1', 'b2', etc.
+        This is used for the get_available_positions function.
+        """
+        moves = []
+        for row in range(6):
+            for col in range(7):
+                if self.board[row][col] != 0:
+                    col_letter = chr(ord('a') + col)
+                    row_num = str(row + 1)
+                    moves.append(f"{col_letter}{row_num}")
+        return moves
+
     def format_game_state(self):
         board_str = self.board_to_string()
-        available_positions = get_available_positions(self.board )#board_str)
+        board_moves = self.get_board_moves()
+        available_positions = get_available_positions(board_moves)
         
         # Format player and AI moves
         player_moves_str = ", ".join(self.player_moves) if self.player_moves else ""