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 "Unknown064"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "1r3k2/2p1nppp/p3p3/8/P1PPq3/Q7/1R3PPP/1R4K1 b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Qxb1+ 2. Rxb1 Rxb1+ 3. Qc1 Rxc1# 0-1