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 "Isakov"]
[Black "Nikitin"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "3rkb1r/p2bpp1p/2B3p1/2p5/Q3P3/2q5/P3KPPP/1RB3NR b k - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qd3+ 2. Kxd3 Bxc6+ 3. Ke3 Bxa4 { Black wins with a large material
advantage. } 0-1