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 "Unknown046"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "3Rr2k/1p3q1p/p3Np1b/1b1R1p2/1P6/P5P1/4QP1P/2r2BK1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Rxb5 ( { White can try: } 1. Qxb5 axb5 2. Rxe8+ Qxe8 3. Rd8 Qxd8 4. Nxd8 { Black wins with a large material advantage. } ) 1... Rxd8 2. Nxd8 Qd7 3. Rxb7 Qxd8 4. Qxa6 { White wins with a large material advantage. } 1-0