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 "Unknown076"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "2rr2k1/1b3ppp/pp1q4/2nn4/8/1PN2P1P/P1NQB1P1/2RR2K1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Bc4 ( { White can try: } 1. Ne3 { Or Nb4. } 1... Nxc3 2. Qxc3 ( 2. Qxd6 Nxe2+ 3. Kf2 Rxd6 4. Kxe2 { Black wins with a large material advantage. } ) 2... Qe7 { Resulting
in an equal position. } ) 1... Nxc3 2. Qxd6 Rxd6 3. Rxd6 Nxa2 4. Rcd1 Kf8 5. Rxb6 { White wins with a large material advantage. } 1-0