Half the variations which are calculated in a tournament game turn out to be completely superfluous. Unfortunately, no one knows in advance which half.
If you are reading this instead of viewing a chess puzzle or game, then you must enable JavaScript on this website.
[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown007"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "1r2r2k/2Q1q1p1/4Pp1p/1p6/p1pR4/2P4P/2P3P1/4R1K1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Rd7 Qf8 2. e7 Qg8 3. Red1 Kh7 4. Rd8 Rbxd8 ( 4... Qe6 5. Qxb8 Rxe7 6. Qxb5 { White wins with a large material advantage. } ) 5. exd8=Q Rxd8 6. Rxd8 Qe6 { White wins with a large material advantage. } 1-0