One bad move nullifies forty good ones.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown419"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r1n5/2pq2kp/1pNP1pp1/1Pb1p3/2Q1P3/2B5/5PPP/2R3K1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Nxe5 fxe5 2. Qd5 Ra3 ( { Black can try: } 2... cxd6 3. Qxa8 Na7 4. Qd5 Qf7 5. Qxf7+ Kxf7 6. Rb1 { White wins with a large material advantage. } ) 3. Qxe5+ Kh6 ( { Black can try: } 3... Kf8 4. Qh8+ Kf7 5. Qg7+ Ke8 6. Qg8# ) ( { Black
can also try: } 3... Kg8 4. Qh8+ Kf7 5. Qg7+ Ke6 6. Qf6# ) 4. Bd2+ g5 ( { Black can try: } 4... Be3 5. Bxe3+ Rxe3 6. fxe3 Qxd6 7. Qxd6 Nxd6 8. Rxc7 Nxb5 9. Rb7 Nd6 10. Rxb6 Nxe4 11. Re6 { White wins with a large material
advantage. } ) 5. Qxg5# 1-0