One bad move nullifies forty good ones.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown103"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/7k/6p1/8/3Qp3/4PqPK/7P/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qf1+ 2. Kh4 Qf5 3. Qd1 ( { White can try: } 3. g4 g5+ 4. Kh3 Qf3# ) 3... g5+ 4. Kh5 Qf3+ 5. Qxf3 exf3 6. e4 f2 7. e5 f1=Q 8. Kxg5 { Black wins with a large
material advantage. } 0-1