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 "Unknown124"] [Result "1-0"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "r3k2r/5pp1/2p1b2p/2bpP1B1/5R2/3Bq2P/4Q1P1/1R5K w kq - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. Ra4 Qxe2 2. Rxa8+ Kd7 3. Rb7# 1-0