Half the variations which are calculated in a tournament game turn out to be completely superfluous. Unfortunately, no one knows in advance which half.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Liaman"]
[Black "Minev"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "4kb1r/3b1pPp/p1npp3/q5B1/2B5/2p2N2/PrPQ2PP/K2R3R b k - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Rxa2+ ( { Capturing white's queen is only good for the draw: } 1... cxd2 2. gxh8=Q Rxa2+ 3. Bxa2 Nb4 4. Kb2 ( { White dare not: } 4. Qb2 Bg7 5. Bf6 Bxf6 6. Nd4 Bxd4 7. c3 Bxc3 8. Kb1 Bxb2 9. Kxb2 Qxa2+ 10. Kc3 Qc2+ 11. Kxb4 Qb2+ 12. Kc4 Bb5# ) 4... Qxa2+ 5. Kc3 Qxc2+ 6. Kxb4 e5 7. Rxd2 a5+ 8. Ka3 Qc3+ 9. Ka2 Be6+ 10. Kb1 Bf5+ 11. Ka2 Be6+ 12. Kb1 Bf5+ { Draw by repetition of
position. } ) 2. Bxa2 Nb4 3. gxf8=Q+ Rxf8 4. Qd5 exd5 5. Rde1+ Be6 6. Rxe6+ fxe6 7. Kb1 Qxa2+ 8. Kc1 Qxc2# 0-1