Author: John Merlino
Date: 16:04:22 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 > >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? > >Regards, > > Jaime Well, you'll have to ask Johan. The King uses null-move and CM_SKR gives a "crushing score" (7.76) in less than one second on an AMD 2500+: Time Depth Score Positions Moves 0:00 1/3 -0.28 1764 62.gxh5 Qg4+ 63.Kh2 Qf4+ 64.Kg2 gxh5 65.Qg7+ Kh4 0:00 1/3 0.39 3672 62.Qe3+ Kxg4 63.e5 Qe7 64.e6 0:00 1/4 -0.05 6377 62.Qe3+ Kxg4 63.e5 Qe7 64.e6 h4 0:00 1/5 0.04 18238 62.Qe3+ Kxg4 63.e5 Qe7 64.e6 h4 65.Kh2 0:00 1/5 1.18 36479 62.Qd2+ Kxg4 63.Qe3 b5 64.Qf3+ Kg5 65.axb5 a4 0:00 1/6 1.18 42403 62.Qd2+ Kxg4 63.Qe3 b5 64.axb5 a4 65.Qf3+ Kg5 0:00 1/7 1.11 62825 62.Qd2+ Kxg4 63.Qe3 b5 64.axb5 a4 65.b6 axb3 66.Qxb3 0:00 1/8 6.24 99795 62.Qd2+ Kxg4 63.Qe3 b5 64.axb5 a4 65.b6 axb3 66.b7 b2 67.Qf3+ Kg5 68.b8=Q 0:00 1/9 7.76 142454 62.Qd2+ Kxg4 63.Qe3 b5 64.axb5 a4 65.b6 axb3 66.b7 b2 67.Qf3+ Kg5 68.b8=Q Qg4+ 69.Qxg4+ hxg4 70.Qe5+ Kh4 71.Qxb2 0:00 1/10 7.76 218861 62.Qd2+ Kxg4 63.Qe3 b5 64.axb5 a4 65.b6 axb3 66.b7 b2 67.Qf3+ Kg5 68.b8=Q Qg4+ 69.Qxg4+ hxg4 70.Qe5+ Kh4 71.Qxb2 0:01 2/11 7.76 370451 62.Qd2+ Kxg4 63.Qe3 b5 64.axb5 a4 65.b6 axb3 66.b7 b2 67.Qf3+ Kg5 68.b8=Q Qg4+ 69.Qxg4+ hxg4 70.Qe5+ Kh4 71.Qxb2 0:03 3/12 8.45 940906 62.Qd2+ Kxg4 63.Qe3 b5 64.axb5 a4 65.b6 axb3 66.b7 b2 67.Qe2+ Kg5 68.b8=Q Qh1+ 69.Kxh1 b1=Q+ 70.Kh2 Qb3 71.Qd2+ Kf6 0:23 4/13 12.06 8261572 62.Qd2+ Kxg4 63.Qe3 Qh3+ 64.Qxh3+ Kf4 65.Qh4+ Ke5 66.Qe7+ Kd4 67.e5 Kc3 68.Qf7 b5 69.e6 bxa4 70.e7 g5 71.Qc4+ Kb2 72.Qe2+ Kxb3 73.e8=Q 0:49 5/14 12.96 18224345 62.Qd2+ Kxg4 63.Qe3 Qh3+ 64.Qxh3+ Kf4 65.Qh4+ Ke5 66.Qe7+ Kd4 67.e5 Kc3 68.Qf7 b5 69.e6 bxa4 70.e7 h4 71.e8=Q h3+ 72.Kxh3 axb3 73.Qxg6 1:56 6/15 14.01 44019358 62.Qd2+ Kf6 63.Qd8+ Ke5 64.Qxh4 hxg4 65.Qxg4 Kd4 66.Qxg6 Kc3 67.e5 Kxb3 68.Qb1+ Kxa4 69.e6 b3 70.e7 Kb4 71.Qe1+ Kc4 72.Qc1+ Kb4 73.e8=Q jm
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