One bad move nullifies forty good ones.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown010"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/8/8/ppbP2p1/2pNp1k1/P1P1P3/1P4K1/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Bxd4 2. exd4 ( { White can try: } 2. cxd4 Kf5 3. Kg3 b4 4. axb4 axb4 5. Kf2 c3 6. bxc3 b3 7. c4 b2 8. c5 b1=Q 9. d6 Kg4 10. d7 Qb2+ 11. Ke1 Kf3 12. Kd1 Kxe3 13. d8=Q Qb1# ) 2... Kf5 3. Kg3 a4 4. Kg2 g4 5. Kf2 Kf6 6. Kg3 e3 7. Kg2 Ke7 8. Kf1 g3 9. Kg2 e2 10. Kxg3 e1=Q+ { Black wins with a large material
advantage. } 0-1