One bad move nullifies forty good ones.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown087"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "rn3rk1/pp3ppp/5P2/4q3/2B2RQ1/6K1/P5PP/2R5 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... g5 2. Rf1 ( { White can try: } 2. h4 Qxf4+ 3. Qxf4 gxf4+ 4. Kxf4 { Black
wins with a large material advantage. } ) 2... h5 3. Qf5 gxf4+ 4. Rxf4 Qxf5 5. Rxf5 Nd7 { Black wins with a large material advantage. } 0-1