One bad move nullifies forty good ones.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown501"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[ECO "A00"]
[FEN "8/8/3N4/4p1P1/2p1Pn2/1k6/1p1P1P2/1K6 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... c3 2. dxc3 Ne2 3. Nb5 Ng1 ( { Black can try: } 3... Nf4 4. f3 Ng6 5. Nd6 Nh4 6. Nc4 Kxc4 7. Kxb2 Ng6 8. Kc2 Nh4 9. Kb2 { Draw by repetition of
position. } ) 4. g6 Nf3 5. g7 Nd2# 0-1