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 "Unknown501"] [Result "1-0"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "8/4k1p1/3pB1P1/2pK3P/ppP5/5r2/PP6/8 w - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1. h6 Rd3+ 2. Kc6 gxh6 3. g7 Kxe6 4. g8=Q+ Ke5 5. Qh8+ Ke4 6. Qh7+ Kd4 7. Qxh6 Kxc4 8. Qf4+ Rd4 9. Qf3 Rd3 10. Qe4+ Rd4 11. Qc2# 1-0