Author: John Merlino
Date: 09:40:25 09/25/03
Go up one level in this thread
On September 25, 2003 at 11:45:15, Tord Romstad wrote: >In the latest round of the Open Class of the Regensburg Winboard Circuit, >my program (playing black) reached the following position: > >[D]r5k/P6p/Q4pp/3p3r/3pb/5P/2P2KPq/R1R2B b - - bm Bxf3; > >Because of the strong attack against the white king, my program evaluates >the position as very good for black. Unfortunately, it was not able to >find a forced win quickly enough. The continuation was Qh4+ Kg1 Qf4 >(there was a draw here by Qh2+, of course), and my program eventually lost. > >When analysing the game with the help of my engine, I found that Bxf3! >seems to win for black. My engine needs 2 minutes and 18 seconds to >find this move when running on an Athlon MP 2.0 GHz (analysis below), >which I find quite disappointing. > >How fast do other engines solve this position? Chessmaster 9000 needs 49 seconds to find Bxf3 on a P4-2.4: Time Depth Score Positions Moves 0:00 1/3 -0.69 2721 1...Qf4 2.Qc6 Qe3+ 3.Kg3 0:00 1/4 -0.03 15977 1...Qf4 2.Qb7 Qe3+ 3.Kg3 Qg5+ 4.Kf2 Qd2+ 5.Kg3 Rg5+ 6.Kh2 0:00 1/4 -0.34 26817 1...Rf5 2.Be2 Qc7 3.Bd3 Qf4 0:00 1/5 1.59 65272 1...Rf5 2.Qc6 Rxf3+ 3.Ke2 Re3+ 4.Kd2 Bxg2 5.Qxa8+ Kg7 0:00 1/5 -0.02 93960 1...Qh4+ 2.g3 Qg5 3.Qe2 Rh2+ 4.Bg2 Qf5 5.Kg1 0:03 1/6 -0.06 504557 1...Qh4+ 2.Kg1 Qf4 3.Qe6+ Kg7 4.Re1 Qh2+ 5.Kf2 Qh4+ 6.Kg1 Bxf3 7.Qd7+ Kh6 8.Re7 0:06 1/7 0.00 1132377 1...Qh4+ 2.Kg1 Qf4 3.Qe6+ Kg7 4.Re1 Qh2+ 5.Kf2 Qh4+ 6.Kg1 Qh1+ 7.Kf2 Qh4+ 0:25 1/8 0.00 4954341 1...Qh4+ 2.Kg1 Qh1+ 3.Kf2 Qh4+ 0:45 1/8 -0.52 8657621 1...Qf4 2.Qe6+ Kh8 3.Rcb1 Bxf3 4.Rb8+ Kg7 5.Rb7+ Kh6 6.Kg1 Be4 0:49 1/8 -1.17 9479081 1...Bxf3 2.Qe6+ Kg7 3.Qe7+ Kh6 4.Qxf6 Bxg2 5.Bxg2 Rg5 6.Rg1 Rf5+ 7.Qxf5 gxf5 0:56 1/9 -1.15 10710018 1...Bxf3 2.Qe6+ Kg7 3.Qe7+ Kh6 4.Qxf6 Rf5 5.Qxf5 gxf5 6.Kxf3 Kg5 7.Rcb1 Qf4+ 8.Ke2 1:31 2/10 -1.43 17734831 1...Bxf3 2.Qe6+ Kg7 3.Qe7+ Kh6 4.Qxf6 Rf5 5.Qxf5 gxf5 6.Kxf3 Qc7 7.Ra6+ Kg5 8.Rca1 Qxc2 jm
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