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 "White player"]
[Black "Black player"]
[Result "*"]
[BlackElo "0"]
[FEN "5k2/2K5/3P4/1b5B/8/8/8/8 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
{ Same Colored Bishop Win.|White wins by intercepting the black bishop's
control the the d7 square. } 1. Bf3 Kf7 ( { Black can try: } 1... Ke8 2. Bc6+ Bxc6 3. Kxc6 Kd8 4. d7 Ke7 5. Kc7 Ke6 6. d8=Q { White wins with a large
material advantage. } ) 2. Bc6 Be2 ( { Black can try: } 2... Bxc6 3. Kxc6 Ke8 4. Kc7 Kf8 5. d7 Kf7 6. d8=Q { White wins with a large material advantage. } ) 3. d7 Bg4 4. d8=Q { White wins with a large material advantage. } *