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 "Podgaec"]
[Black "Kuprejcik"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "6k1/6pp/p7/1pqP1rN1/2p3Q1/3b4/PP4PP/4R2K b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qe3 2. Qg3 Qxg5 { Black has a material advantage, but can he survive
white's attack. } 3. Re8+ Kf7 4. Qc7+ Kg6 ( { A greedy capture only results in a
draw: } 4... Kxe8 5. Qc6+ Kf7 6. Qe6+ Kf8 7. Qc8+ Ke7 8. Qe6+ Kd8 9. Qd6+ Kc8 10. Qxa6+ Kd7 11. Qc6+ Ke7 12. Qe6+ { Black cannot escape white's checks.
Draw. } ) 5. h3 Rf1+ 6. Kh2 Kh6 7. Re6+ g6 8. Re7 Qf4+ 9. Qxf4+ Rxf4 10. d6 Rd4 11. d7 Bf5 12. g4 Bxd7 { Black wins with a large material advantage. } 0-1