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 "Unknown"] [Black "Unknown328"] [Result "1-0"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "8/1R3Qbk/2p4p/p1Pp2p1/P2Ppn2/5n2/5Bq1/4K1N1 w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. Nxf3 Nd3+ 2. Kd2 Qxf2+ 3. Kc3 Qxd4+ 4. Nxd4 Ne5 5. Qxg7# 1-0