update app.py

app.py

@@ -55,7 +55,7 @@ def get_move(board_text, player):
     game = Breakthrough()
     game.board = parse_board(board_text)
     game.move_count = 0
-    game.cachedmatrix = None
+    game.cached_matrix = None
     searcher = MCVSSearcher(None, None, zonedb, lambda_zone=1.0, k_zone=5)
     visits, _ = searcher.search_with_time_budget(game, 1.0)
     if not visits: