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 "Unknown096"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "2r2rk1/p4pp1/1pB4p/2b5/6n1/P5B1/1P3PPP/2R2RK1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Bd7 Rcd8 2. Bxg4 f5 3. b4 ( { White can try: } 3. Bf3 f4 4. Bh4 g5 5. Bxg5 hxg5 { Black is still in the game. } ) 3... Bd4 4. Bc7 Rde8 5. Bh5 Rc8 6. Rfd1 Bb2 7. Rc6 Bxa3 8. b5 { White wins with a large material advantage. } 1-0