Author: Omid David Tabibi
Date: 15:30:07 06/14/04
Go up one level in this thread
On June 14, 2004 at 18:22:12, Jaime Benito de Valle Ruiz wrote: >>1.gxh5 Qg4+ 2.Kf2 Qf4+ 3.Ke1 Kxh5 4.Ke2 g5 5.Kd3 Qf1+ 6.Kd2 >> ³ (-0.30) Depth: 8/28 00:00:01 558kN >>1.gxh5 Qg4+ 2.Kf2 Qf4+ 3.Ke2 gxh5 4.Qg7+ Kh4 5.Qd4 Qg4+ 6.Kd2 Qe6 7.Qd5 >> ³ (-0.30) Depth: 9/31 00:00:02 1287kN >>1.Qd2+ >> ³ (-0.29) Depth: 9/31 00:00:02 1450kN >>1.Qd2+ >> = (0.00) Depth: 9/31 00:00:02 1451kN >>1.Qd2+ >> ² (0.60) Depth: 9/31 00:00:02 1452kN >>1.Qd2+ Kxg4 2.Qe3 b5 3.axb5 a4 4.bxa4 >> ± (0.79) Depth: 9/31 00:00:02 1454kN >>1.Qd2+ Kxg4 2.Qe3 b5 3.axb5 a4 4.bxa4 >> ± (0.79) Depth: 10/31 00:00:03 1533kN >>1.Qd2+ >> ± (1.09) Depth: 11/31 00:00:03 1721kN >>1.Qd2+ >> +- (1.69) Depth: 11/31 00:00:04 1726kN >>1.Qd2+ Kxg4 2.Qe3 b5 3.axb5 a4 4.bxa4 b3 5.Qxb3 >> +- (2.65) Depth: 11/32 00:00:04 1836kN >>1.Qd2+ >> +- (2.35) Depth: 12/34 00:00:05 2428kN >>1.Qd2+ >> +- (1.75) Depth: 12/34 00:00:05 2939kN >>1.Qd2+ Kxg4 2.Qe3 b5 3.axb5 a4 4.bxa4 b3 5.Qxb3 >> +- (2.65) Depth: 12/34 00:00:05 2965kN >>1.Qd2+ >> +- (2.35) Depth: 13/36 00:00:07 4004kN >>1.Qd2+ >> +- (1.75) Depth: 13/36 00:00:07 4759kN >>1.Qd2+ Kxg4 2.Qe3 b5 3.axb5 a4 4.bxa4 b3 5.Qxb3 Kf4 6.Qf3+ Ke5 7.Qg3+ Qxg3+ >>8.Kxg3 >> +- (2.51) Depth: 13/36 00:00:07 4839kN, tb=2 >>1.Qd2+ >> +- (2.21) Depth: 14/41 00:00:10 7208kN, tb=2 >>1.Qd2+ >> +- (2.81) Depth: 14/41 00:00:11 7429kN, tb=9 >>1.Qd2+ Kxg4 2.Qe3 b5 3.axb5 a4 4.bxa4 b3 5.Qxb3 Kf4 6.Qf7+ Ke5 7.Qxg6 >> +- (3.16) Depth: 14/41 00:00:11 7568kN, tb=9 >>1.Qd2+ >> +- (3.46) Depth: 15/41 00:00:15 10115kN, tb=14 >>1.Qd2+ >> +- (4.06) Depth: 15/41 00:00:15 10477kN, tb=14 >>1.Qd2+ >> +- (5.86) Depth: 15/45 00:00:16 11180kN, tb=14 >>1.Qd2+ Kxg4 2.Qe3 b5 3.axb5 a4 4.b6 axb3 5.b7 b2 6.b8Q Qh1+ 7.Kxh1 b1Q+ 8.Kg2 >>Qb2+ 9.Kf1 Qa1+ 10.Kf2 Qf6+ 11.Ke2 >> +- (11.75) Depth: 15/47 00:00:18 12776kN, tb=14 >> >> >>If I disable verfied null-move pruning, Falcon doesn't find the correct move. > >Interesting... My engine (Ayito) definitely finds it very fast without >null-move, and Falcon is far far better than Ayito. Engines such as Ruffian or >Crafty (to name two) stick to gxh5 at depth 14, and don't find it after over 1 >minute. > > >>I use verified null-move pruning (an improved version of it). > >Maybe this is why your engine finds it. Yes. The following is the analysis with verified null-move disabled: 1.gxh5 Qg4+ 2.Kf2 Qf4+ 3.Ke1 Kxh5 4.Ke2 g5 5.Kd3 Qf1+ 6.Kd2 ³ (-0.30) Depth: 8/28 00:00:00 556kN 1.gxh5 Qg4+ 2.Kf2 Qf4+ 3.Ke2 gxh5 4.Qg7+ Kh4 5.Qd4 Qg4+ 6.Kd2 Qe6 7.Qd5 ³ (-0.30) Depth: 9/31 00:00:02 1415kN 1.gxh5 Qg4+ 2.Kf2 Qf4+ 3.Ke2 gxh5 4.Qd5+ Kf6 5.Qd8+ Kg7 6.Qe7+ Qf7 7.Qg5+ Kh7 8.Qg3 Qf6 ³ (-0.31) Depth: 10/31 00:00:04 3235kN 1.gxh5 Qg4+ 2.Kf2 gxh5 3.Qe5+ Kg6 4.Qd6+ Kf7 5.Qd5+ Ke7 6.Qb7+ Qd7 7.Qxb6 Qd2+ 8.Kg3 Qg5+ 9.Kf3 Qg4+ 10.Kf2 Qf4+ 11.Kg1 ³ (-0.34) Depth: 11/34 00:00:12 8027kN 1.Qe3+ ³ (-0.33) Depth: 11/35 00:00:14 9406kN 1.Qe3+ ³ (-0.63) Depth: 12/37 00:00:19 12594kN 1.Qe3+ µ (-1.23) Depth: 12/38 00:00:32 21277kN 1.Qe3+ Kxg4 2.Qe2+ Kf4 3.Qf1+ Kg5 4.Qb5+ Kh6 5.Qd5 Qg5+ 6.Kh1 h4 7.e5 h3 8.Kh2 Qf5 9.Qc4 Qxe5+ 10.Kxh3 -+ (-2.16) Depth: 12/43 00:01:16 50741kN, tb=1 1.gxh5 -+ (-2.15) Depth: 12/43 00:01:23 55394kN, tb=1 1.gxh5 Qg4+ 2.Kf2 gxh5 3.Qe5+ Kg6 4.Qd6+ Kf7 5.Qe5 Qg6 6.Qd5+ Ke7 7.Qb7+ Kf8 8.Qd5 Qf6+ 9.Kg3 h4+ 10.Kh3 ³ (-0.48) Depth: 12/43 00:01:39 66802kN, tb=2 Correct move not found. >I'd like to get more input on this from >others. >I'll try the verified N.M one of these days. After the WCCC I will publish my improved version of verified null-move pruning when I get the time. I have changed several things in the original formulation to make the algorithm work more efficiently. > >Regards, > > Jaime
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