Author: Omid David Tabibi
Date: 15:01:31 06/14/04
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On June 14, 2004 at 16:31:17, Jaime Benito de Valle Ruiz wrote: >[d]8/8/1p4p1/p5kp/Pp1QP1Pq/1P6/6K1/8 w - - 0 62 Analysis by Falcon: 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. > >White moves and wins! >Can your engine find the right answer and give the proper "crushing" score >(around 9 pawns!) along with a proper PV? How long does it take? >Mine doesn't find anything after a long long time (over an hour), but with >null-move disabled, it takes only a few seconds to show the full PV. >(Some engines find the right answer, but with a small score, an absurd PV, and >they change their mind some plies later) > >In this position the black king is in a very delicate position: After a couple >of moves, if the black queen moves, white checkmates inmediately, so both kings >and queens must remain still while pawns play on their own. > >Any good suggestion to avoid this problem with null-move? I use verified null-move pruning (an improved version of it). > >Regards, > > Jaime
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