One bad move nullifies forty good ones.
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[Event "rated untimed match"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "Malevinskij"] [Black "Gefenas"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "1k5r/1b1p4/2q2Q2/1R1p2p1/1B1P2r1/8/1P5P/5R1K b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Rxh2+ 2. Kxh2 Qc2+ 3. Qf2 Qh7+ 4. Qh4 Qxh4# 0-1