One bad move nullifies forty good ones.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown124"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r2q1rk1/1b3pBp/p3p1p1/1p5R/3P2Q1/1BP5/P4PPP/R5K1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... gxh5 ( { Black can try: } 1... Kxg7 2. Rh3 { With equal chances. } ) 2. Qg3 h4 3. Qe5 ( { White can try: } 3. Qg4 h5 4. Qxh5 Kxg7 5. Re1 Qf6 6. Re5 Rg8 7. d5 Kf8 8. g3 Rc8 { Black wins with a large material advantage. } ) 3... f6 4. Qxe6+ Kxg7 5. Qg4+ Kh8 { Black wins with a large material advantage. } 0-1