One bad move nullifies forty good ones.
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[Event "rated untimed match"]
[Site "?"]
[Date "1965.??.??"]
[Round "?"]
[White "Antoshin"]
[Black "Tsvetkov"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r1b2r1k/ppb1qp1p/2p3pQ/4n3/1PB1N3/P3P3/1B1P2PP/R3K2R w KQ - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Nf6 b5 ( { Black can try: } 1... Qxf6 2. Qxf8# ) 2. Qxh7# 1-0