One bad move nullifies forty good ones.
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[Event "rated untimed match"] [Site "?"] [Date "1940.??.??"] [Round "?"] [White "Kakovin"] [Black "Study"] [Result "1-0"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "1R6/kp6/p7/1p6/N7/P7/1K1b4/8 w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. Rd8 Ba5 2. Rd5 bxa4 3. Rxa5 b5 4. Kc3 Kb7 5. Kd4 Kb6 6. Kd5 Kxa5 7. Kc5 b4 8. axb4# 1-0