One bad move nullifies forty good ones.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown175"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "5r2/p3p1kp/1p4p1/3q4/4b1Q1/1P1nPP2/P5PP/2RR2K1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Bf5 2. Qg5 ( { White dare not try: } 2. e4 Qd4+ 3. Kh1 Nf2+ 4. Kg1 Nh3+ 5. Kh1 Qg1+ 6. Rxg1 Nf2# ) 2... Qe5 ( { Black can try: } 2... Qd6 3. Rc3 Rd8 4. Rcxd3 ( 4. e4 Qd4+ 5. Kh1 Nf2+ 6. Kg1 Nh3+ 7. Kh1 Qg1+ 8. Rxg1 Nf2# ) 4... Bxd3 5. Rxd3 Qxd3 6. Qxe7+ Kh8 7. Qe5+ Kg8 8. Qe6+ Kf8 9. Qf6+ Ke8 10. Qe6+ { Draw. } ) 3. Rxd3 h6 4. Qg3 Qxg3 5. hxg3 Bxd3 0-1