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 "1969.??.??"] [Round "?"] [White "Alexandria"] [Black "Kristol"] [Result "1-0"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "5rk1/1pq1pp1p/1p1n2p1/8/2P1N2P/1P2Q3/r5P1/3R1R1K w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. Rxd6 exd6 2. Nf6+ Kg7 3. Qc3 Kh8 4. Ne8+ Kg8 5. Qg7# 1-0