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 "Unknown516"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/6pk/5p1p/4pP2/p2pP3/1q1P1KP1/1PQ4P/8 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Qxb3 axb3 2. Kg4 g5 3. fxg6+ Kxg6 4. h3 h5+ 5. Kh4 Kh6 6. g4 hxg4 7. Kxg4 Kg6 8. h4 Kh6 9. h5 Kh7 10. Kf5 Kh6 11. Kxf6 Kxh5 12. Kxe5 Kg5 13. Kxd4 { White wins with a large material advantage. } 1-0