One bad move nullifies forty good ones.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown548"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "5q2/p5RQ/kppp4/4p2P/4P3/1BPP4/PP3r2/3K3R b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qf3+ 2. Kc1 Qe3+ ( { Black can try: } 2... Qxh1+ 3. Bd1 Rf1 4. Rxa7+ Kb5 5. a4+ Kc5 6. b4# ) 3. Kb1 Qxd3+ 4. Ka1 Rf1+ 5. Rxf1 Qxf1+ 6. Bd1 Qxd1# 0-1