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 "Unknown024"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "8/p4kp1/4Rrp1/1pq5/1pp5/P6Q/5PPP/4R1K1 b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Qxf2+ 2. Kh1 Qf1+ 3. Rxf1 Rxf1# 0-1