The section on the chess game is not particularly persuasive. According to Stockfish, black already has winning position. So Frank (playing white) can no longer

The section on the chess game is not particularly persuasive. According to Stockfish, black already has winning position. So Frank (playing white) can no longer make mistakes. All moves at his disposal lead to the same outcome. "Queen to Bishop three" is not a legal move, so Frank could have autocorrected it.