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 "Unknown060"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "3r4/ppk5/8/6N1/1Pp2P2/P1R3P1/3r4/6K1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Ne6+ Kd7 2. Nxd8 Kxd8 3. Rxc4 Rd3 4. Kg2 Rxa3 { White wins with a large
material advantage. } 1-0