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 "Unknown02"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "6k1/3r2p1/p4p2/3b4/8/7K/4BPPP/3R4 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Rxd5 ( { White must be accurate here because: } 1. Bc4 Bxc4 2. Rxd7 Be6+ 3. Kg3 Bxd7 { Black wins with a large material advantage. } ) 1... Rxd5 2. Bc4 Kf8 3. Bxd5 { White wins with a large material advantage. } 1-0