One bad move nullifies forty good ones.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown425"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "4k3/ppp2b2/7Q/3PqBKp/2P2N2/1P3p1P/8/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... f2 2. Ng6 Qe3+ ( { Black can try: } 2... Bxg6 3. Qxg6+ Kf8 4. Qh6+ Kg8 5. Qh7+ Kf8 6. Qh6+ Ke8 7. Qg6+ Kf8 { Draw by repetition of position. } ) 3. Kxh5 Qxh6+ 4. Kxh6 f1=Q { Black wins with a large material advantage. } 0-1