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 "Bamberg"] [Date "1950.??.??"] [Round "?"] [White "Rannefort"] [Black "Unknown"] [Result "1-0"] [BlackElo "0"] [FEN "2bq1nkb/2p4p/2pp3Q/r4NpN/p2PP3/2P5/PP4PP/5RK1 w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. Qe6+ Bxe6 2. Nh6# 1-0