Author: Drexel,Michael
Date: 11:06:41 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 needs 16 secs and Shredder needs only 10 secs to find Bxf3. However there is no reason to be disappointed because finally I managed to find a program which is slower here: Fritz 8 needs 8 min and 24 secs 1.8 GHz AMD Michael r5k1/P6p/Q4pp1/3p3r/3pb3/5P2/2P2KPq/R1R2B2 b - - 0 1 Analysis by AntiCM(64MB): 1...Qf4 2.Qc6 Qe3+ 3.Kg3 ³ (-0.57) Depth: 3 00:00:00 1...Qf4 2.Qe6+ Kh8 3.Re1 Rh2 4.Kg1 Bxf3 = (-0.07) Depth: 4 00:00:00 1...Rf5 2.Be2 Qc7 3.Qe6+ Kh8 4.g4 = (-0.13) Depth: 4 00:00:00 1...Rf5 2.Qb7 Rxf3+ 3.Ke2 Re3+ 4.Kd2 Bxg2 5.Qxa8+ Kg7 ± (1.37) Depth: 5 00:00:00 1...Qh4+ 2.g3 Qg5 3.Qe2 Bf5 4.Bg2 Rh2 5.Qe7 = (0.21) Depth: 5 00:00:00 1...Qf4 2.Qe6+ Kh8 3.Qc6 Qe3+ 4.Kg3 Qg5+ 5.Kf2 Qe3+ = (-0.11) Depth: 5 00:00:00 1...Qf4 2.Qe6+ Kh8 3.Qc6 Qe3+ 4.Kg3 Qg5+ 5.Kf2 Qe3+ = (-0.11) Depth: 6 00:00:00 160kN 1...Qf4 2.Qe6+ Kh8 3.Qc6 Qe3+ 4.Kg3 Qg5+ 5.Kf2 Qe3+ = (-0.11) Depth: 7 00:00:02 486kN 1...Qf4 2.Qe6+ Kh8 3.Qc6 Qe3+ 4.Kg3 Qg5+ 5.Kf2 Qe3+ = (-0.11) Depth: 8 00:00:07 1842kN 1...Bxf3 2.Qb7 Qf4 3.Qxa8+ Kg7 4.Qg8+ Kh6 5.Qf8+ Kg5 6.Qe8 Bxg2+ 7.Ke1 Qxf1+ 8.Kd2 Qf4+ 9.Kd1 µ (-1.13) Depth: 8 00:00:16 4266kN 1...Bxf3 2.Qe6+ Kg7 3.Qe7+ Kh6 4.Qxf6 Rf5 5.Qxf5 gxf5 6.Kxf3 Kg5 7.Rcb1 Qf4+ 8.Ke2 -+ (-1.78) Depth: 9 00:00:24 6349kN 1...Bxf3 2.Qe6+ Kg7 3.Qe7+ Kh6 4.Qxf6 Rf5 5.Qxf5 gxf5 6.Kxf3 Qc7 7.Ra6+ Kg5 8.Rca1 Qxc2 -+ (-2.12) Depth: 10 00:01:04 16257kN (, 25.09.2003) Analysis by Shredder 7.04(64MB): 1...Rg5 2.fxe4 dxe4 = (-0.15) Depth: 1/2 00:00:00 1...Rg5 2.fxe4 dxe4 3.Qxf6 +- (1.69) Depth: 1/4 00:00:00 1...Rg5 2.fxe4 dxe4 3.Qxf6 ± (1.19) Depth: 1/4 00:00:00 1...Qf4 µ (-1.39) Depth: 1/6 00:00:00 1...Qf4 µ (-1.39) Depth: 1/6 00:00:00 1...Qf4 2.Qa3 µ (-0.86) Depth: 2/3 00:00:00 1...Qf4 2.Qc6 Qe3+ 3.Kg3 ² (0.66) Depth: 2/8 00:00:00 1...Qf4 2.Qb7 Qe3+ 3.Kg3 ± (0.81) Depth: 2/8 00:00:00 1...Qh4+ 2.Ke2 Kh8 3.fxe4 dxe4 ² (0.34) Depth: 2/10 00:00:00 1...Qh4+ 2.Kg1 Qh2+ 3.Kf2 Qf4 4.Qb7 Qe3+ 5.Kg3 = (-0.02) Depth: 2/10 00:00:00 1...Qh4+ 2.g3 Qh2+ 3.Bg2 ³ (-0.61) Depth: 2/10 00:00:00 1...Qh4+ 2.Ke2 Bxf3+ 3.gxf3 Qf2+ 4.Kxf2 Rh2+ 5.Bg2 ³ (-0.36) Depth: 3/17 00:00:00 1...Qh4+ 2.Ke2 Bd3+ 3.Qxd3 Qf2+ 4.Kxf2 = (0.14) Depth: 3/17 00:00:00 1...Qh4+ 2.Ke2 Bxf3+ 3.gxf3 Re5+ 4.Kd2 Qf4+ 5.Kd1 Qxf3+ 6.Be2 = (0.16) Depth: 3/17 00:00:00 1...Qh4+ 2.Ke2 Bxf3+ 3.Kd2 Re5 4.Qe6+ Rxe6 = (-0.09) Depth: 4/16 00:00:00 1...Qh4+ 2.Kg1 Bxf3 3.Qb7 Qh2+ 4.Kf2 ³ (-0.32) Depth: 4/16 00:00:00 1...Qh4+ 2.g3 Qh2+ 3.Bg2 Rg5 4.Qd6 Rxa7 5.Rxa7 Qxg3+ 6.Qxg3 = (-0.07) Depth: 5/19 00:00:00 1...Qh4+ 2.g3 Qh2+ 3.Bg2 Rf5 4.Qe6+ Kh8 5.Ra3 Kg7 = (-0.05) Depth: 5/19 00:00:00 1...Qh4+ 2.Kg1 Qf4 3.Re1 Qh2+ 4.Kf2 Qh4+ 5.g3 Qh2+ 6.Bg2 ³ (-0.29) Depth: 6/24 00:00:00 1...Qh4+ 2.Kg1 Qf4 3.Re1 Qh2+ 4.Kf2 Qh4+ 5.Ke2 d3+ 6.cxd3 Bxf3+ 7.Kxf3 Rf5+ 8.Ke2 Qe4+ 9.dxe4 = (-0.04) Depth: 7/26 00:00:00 132kN 1...Qh4+ 2.Kg1 Qf4 3.Re1 Qh2+ 4.Kf2 Rf5 5.Rxe4 dxe4 6.Qc8+ Rxc8 = (-0.04) Depth: 7/31 00:00:00 180kN 1...Qh4+ 2.Kg1 Bxf3 3.Qb7 Qh2+ 4.Kf2 Qh4+ 5.Kg1 Qh2+ 6.Kf2 Qh4+ 7.Kg1 Qh2+ = (-0.04) Depth: 8/34 00:00:01 568kN 1...Qh4+ 2.Kg1 Bxf3 3.Qb7 Qh2+ 4.Kf2 Qh4+ 5.Kg1 Qh2+ 6.Kf2 Qh4+ 7.Kg1 Qh2+ = (-0.04) Depth: 9/34 00:00:03 1264kN 1...Qh4+ 2.Kg1 Bxf3 3.Qb7 Qh2+ 4.Kf2 Qh4+ 5.Kg1 Qh2+ 6.Kf2 Qh4+ 7.Kg1 Qh2+ = (-0.04) Depth: 10/33 00:00:08 2851kN 1...Bxf3 2.Qb7 Qf4 3.Qxa8+ Kg7 4.Qg8+ Kh6 5.Qxg6+ hxg6 6.c4 = (-0.05) Depth: 10/33 00:00:10 3860kN 1...Bxf3 2.Qb7 Qf4 3.Qxa8+ Kg7 4.Qg8+ Kh6 5.Qxg6+ hxg6 6.c4 dxc4 7.a8Q Bxa8+ ³ (-0.40) Depth: 10/35 00:00:14 5129kN 1...Bxf3 2.Qe6+ Kg7 3.Rcb1 Rf5 4.Qxf5 gxf5 5.Rb7+ Kg6 6.Kxf3 -+ (-2.58) Depth: 10/37 00:00:30 11120kN (, 25.09.2003) Analysis by Shredder 7.04(256MB): 1...Rg5 2.fxe4 dxe4 = (-0.15) Depth: 1/2 00:00:00 1...Rg5 2.fxe4 dxe4 3.Qxf6 +- (1.69) Depth: 1/4 00:00:00 1...Rg5 2.fxe4 dxe4 3.Qxf6 ± (1.19) Depth: 1/4 00:00:00 1...Qf4 µ (-1.39) Depth: 1/6 00:00:00 1...Qf4 µ (-1.39) Depth: 1/6 00:00:00 1...Qf4 2.Qa3 µ (-0.86) Depth: 2/3 00:00:00 1...Qf4 2.Qc6 Qe3+ 3.Kg3 ² (0.66) Depth: 2/8 00:00:00 1...Qf4 2.Qb7 Qe3+ 3.Kg3 ± (0.81) Depth: 2/8 00:00:00 1...Qh4+ 2.Ke2 Kh8 3.fxe4 dxe4 ² (0.34) Depth: 2/10 00:00:00 1...Qh4+ 2.Kg1 Qh2+ 3.Kf2 Qf4 4.Qb7 Qe3+ 5.Kg3 = (-0.02) Depth: 2/10 00:00:00 1...Qh4+ 2.g3 Qh2+ 3.Bg2 ³ (-0.61) Depth: 2/10 00:00:00 1...Qh4+ 2.Ke2 Bxf3+ 3.gxf3 Qf2+ 4.Kxf2 Rh2+ 5.Bg2 ³ (-0.36) Depth: 3/17 00:00:00 1...Qh4+ 2.Ke2 Bd3+ 3.Qxd3 Qf2+ 4.Kxf2 = (0.14) Depth: 3/17 00:00:00 1...Qh4+ 2.Ke2 Bxf3+ 3.gxf3 Re5+ 4.Kd2 Qf4+ 5.Kd1 Qxf3+ 6.Be2 = (0.16) Depth: 3/17 00:00:00 1...Qh4+ 2.Ke2 Bxf3+ 3.Kd2 Re5 4.Qe6+ Rxe6 = (-0.09) Depth: 4/16 00:00:00 1...Qh4+ 2.Kg1 Bxf3 3.Qb7 Qh2+ 4.Kf2 ³ (-0.32) Depth: 4/16 00:00:00 1...Qh4+ 2.g3 Qh2+ 3.Bg2 Rg5 4.Qd6 Rxa7 5.Rxa7 Qxg3+ 6.Qxg3 = (-0.07) Depth: 5/19 00:00:00 1...Qh4+ 2.g3 Qh2+ 3.Bg2 Rf5 4.Qe6+ Kh8 5.Ra3 Kg7 = (-0.05) Depth: 5/19 00:00:00 1...Qh4+ 2.Kg1 Qf4 3.Re1 Qh2+ 4.Kf2 Qh4+ 5.g3 Qh2+ 6.Bg2 ³ (-0.29) Depth: 6/24 00:00:00 1...Qh4+ 2.Kg1 Qf4 3.Re1 Qh2+ 4.Kf2 Qh4+ 5.Ke2 d3+ 6.cxd3 Bxf3+ 7.Kxf3 Rf5+ 8.Ke2 Qe4+ 9.dxe4 = (-0.04) Depth: 7/26 00:00:00 132kN 1...Qh4+ 2.Kg1 Qf4 3.Re1 Qh2+ 4.Kf2 Rf5 5.Rxe4 dxe4 6.Qc8+ Rxc8 = (-0.04) Depth: 7/31 00:00:00 181kN 1...Qh4+ 2.Kg1 Bxf3 3.Qb7 Qh2+ 4.Kf2 Qh4+ 5.Kg1 Qh2+ 6.Kf2 Qh4+ 7.Kg1 Qh2+ = (-0.04) Depth: 8/34 00:00:01 571kN 1...Qh4+ 2.Kg1 Bxf3 3.Qb7 Qh2+ 4.Kf2 Qh4+ 5.Kg1 Qh2+ 6.Kf2 Qh4+ 7.Kg1 Qh2+ = (-0.04) Depth: 9/34 00:00:04 1250kN 1...Qh4+ 2.Kg1 Bxf3 3.Qb7 Qh2+ 4.Kf2 Qh4+ 5.Kg1 Qh2+ 6.Kf2 Qh4+ 7.Kg1 Qh2+ = (-0.04) Depth: 10/33 00:00:08 2809kN 1...Bxf3 2.Qb7 Qf4 3.Qxa8+ Kg7 4.Qg8+ Kh6 5.Qxg6+ hxg6 6.c4 = (-0.05) Depth: 10/33 00:00:11 3791kN 1...Bxf3 2.Qb7 Qf4 3.Qxa8+ Kg7 4.Qg8+ Kh6 5.Qxg6+ hxg6 6.c4 dxc4 7.a8Q Bxa8+ 8.Ke1 Qe3+ 9.Be2 ³ (-0.40) Depth: 10/33 00:00:14 5022kN 1...Bxf3 2.Qb7 Qf4 3.Qxa8+ Kg7 4.Qf8+ Kxf8 5.a8Q+ Kg7 6.Ra7+ Kh6 7.Qf8+ Kg5 8.Qa3 Bxg2+ 9.Ke2 Bxf1+ 10.Kd1 Rh2 11.Qe7 -+ (-2.61) Depth: 10/37 00:00:30 10142kN 1...Bxf3 2.Qe6+ Kg7 3.Rcb1 Rf5 4.Rb7+ Kh6 5.Qxf5 Bxg2 6.Qxf6 Bxf1+ -+ (-2.36) Depth: 11/35 00:00:43 13830kN 1...Bxf3 2.Qe6+ Kg7 3.Rcb1 Rf5 4.Rb7+ Kh6 5.Qxf5 gxf5 6.Kxf3 Kg5 7.Rg7+ Kh6 -+ (-2.09) Depth: 11/35 00:00:46 14722kN Analysis by Fritz 8(64MB): 1...Qh4+ 2.Kg1 Qf4 3.Qe6+ Kg7 4.Qe7+ Kh6 5.Kf2 Qe3+ 6.Kg3 Rf5 µ (-1.28) Depth: 6/28 00:00:00 239kN 1...Qh4+ 2.g3 Qg5 3.Qe2 Rh2+ 4.Bg2 Qf5 5.c4 dxc3 6.Rxc3 µ (-1.25) Depth: 7/27 00:00:00 408kN 1...Qh4+-- µ (-0.97) Depth: 8/29 00:00:00 652kN 1...Qh4+ 2.g3 Qh2+ µ (-0.97) Depth: 8/30 00:00:00 777kN 1...Qh4+-- ³ (-0.69) Depth: 9/29 00:00:02 1673kN 1...Qh4+ 2.g3 Qh2+ 3.Bg2 Rf5 4.Qe6+ Kg7 = (0.00) Depth: 9/41 00:00:03 3216kN 1...Qh4+ 2.Kg1 Qf4 3.Re1 Qh2+ 4.Kf2 Qh4+ 5.Kg1 Bxf3 6.Qe6+ Kg7 = (0.00) Depth: 10/38 00:00:14 12770kN 1...Qh4+ 2.Kg1 Qf4 3.Re1 Qh2+ 4.Kf2 Qh4+ 5.Kg1 Qh2+ = (0.00) Depth: 11/39 00:00:31 28418kN 1...Qh4+ 2.Kg1 Qf4 3.Re1 Qh2+ 4.Kf2 Qh4+ 5.Kg1 Qh2+ = (0.00) Depth: 12/40 00:01:17 70235kN 1...Qh4+ 2.Kg1 Bxf3 3.Qb7 Qh2+ 4.Kf2 Qh4+ 5.Kg1 = (0.00) Depth: 13/45 00:04:03 222740kN 1...Qf4! = (-0.03) Depth: 13/45 00:06:02 333056kN 1...Bxf3! = (-0.06) Depth: 13/45 00:08:24 452344kN
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