One bad move nullifies forty good ones.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown121"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "2r1r1k1/p1pq2p1/7p/2R4Q/2P2P2/1P6/P5PP/5RK1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qd4+ 2. Kh1 Qf2 { White dare not try: } 3. Rxf2 ( { White can try: } 3. Qf3 Qxc5 { Black wins with a large material advantage. } ) ( { White can also try: } 3. Rg1 Re1 4. Qd5+ Kh8 5. Rxc7 Qxg1# ) 3... Re1+ 4. Rf1 Rxf1# 0-1