One bad move nullifies forty good ones.
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[Event "rated untimed match"] [Site "?"] [Date "1899.??.??"] [Round "?"] [White "Anon"] [Black "Pilsbury"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "7k/p4q1p/1pb5/2p5/4B2Q/2P1B3/P6P/7K b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Qf1+ 2. Bg1 Qf3+ 3. Bxf3 Bxf3# 0-1