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 "Unknown000"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "4k1nr/p1pbqppp/2Qp4/4b3/2B5/2N1B3/PrP2PPP/R4RK1 w k - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Qa8+ Qd8 2. Bxf7+ Kxf7 3. Qxd8 { White wins with a large material
advantage. } 1-0