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 "Mitropa Cup"]
[Site "?"]
[Date "2014.??.??"]
[Round "?"]
[White "Acs"]
[Black "Brunner"]
[Result "1-0"]
[BlackElo "0"]
[FEN "1R1r2k1/Q4pp1/7p/8/8/2n2BP1/3q1PKP/8 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Qe3 Kh7 ( { Black can try: } 1... Qxe3 2. Rxd8+ Kh7 3. fxe3 { White wins
with a large material advantage. } ) 2. Rxd8 Qxd8 3. Qxc3 { White has
significant material advantage. The rest is just technique. } 1-0