One bad move nullifies forty good ones.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown029"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r2qk1nr/pp1bbppp/2n5/1B1pN3/3P4/5Q2/PP3PPP/RNB2RK1 b kq - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Nxe5 2. Bxd7+ Nxd7 3. Qxd5 Ngf6 4. Qxb7 { Black wins with a large
material advantage. } 0-1