Author: Stan Arts
Date: 02:23:37 06/15/04
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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 Hi Jaime, Thanks for the position. It has several nice elements in it so I think I will be using it as one of my positions-I-like-to-test-with-sometimes-positions. Neurosis currently finds Qd2 on depth 10. Unfortunatly my program doesn't have much passed pawn knowledge and will extend a maximum of just 1 ply when a pawn gets to the 7th rank and therefore doesn't find near-promotions very fast, with or without null-move. That's also why this is a nice position to use as a position-I-like-to-te..ugh. (P3-550 48 Mb hash.) Legal moves: 26 Static score: -63 Ply Score Time Nodes Best move and expected line ------------------------------------------------------------ 2 -72 0 1585 gxh5 Qg4+ Kf2 Qf4+ Ke1 3 -72 0 1964 gxh5 Qg4+ Kf2 Qf4+ Ke1 4 -72 6 5814 gxh5 Qg4+ Kf2 Qf4+ Ke2 gxh5 5 -72 11 12707 gxh5 Qg4+ Kf2 Qf4+ Ke2 gxh5 6 -71 71 70694 gxh5 Qg4+ Kf2 Qf4+ Ke2 Qg4+ Ke1 gxh5 7 -69 170 177158 gxh5 Qg4+ Kf2 Qf4+ Ke2 Qg4+ Kd2 Qf4+ Kd3 Qf3+ Kd2 Qg2+ Kc1 Qh1+ Kc2 gxh5 8 -70 401 409442 gxh5 Qg4+ Kf2 Qf4+ Ke2 Kxh5 Qh8+ Kg4 Qc8+ Kg5 Qe6 Qg4+ Qxg4+ Kxg4 9 -71 1016 1035056 gxh5 Qg4+ Kf2 Qf4+ Kg2 Kxh5 Qh8+ Qh6 Qxh6+ Kxh6 e5 g5 10 -71 2406 2446719 gxh5 Qg4+ Kf2 Qf4+ Kg2 gxh5 Qd5+ Kf6 Qc6+ Ke7 Qb7+ Ke8 Qa8+ Kf7 Qb7+ Ke8 Qa8+ Kf7 Qb7+ Ke8 10 -70 7717 7910408 Qd2+ < + > Kxg4 Qe3 b5 axb5 Qf2+ Qxf2 g5 h4 10 10 8783 8999577 Qd2+ < + > Kxg4 Qe3 b5 axb5 Qf2+ Qxf2 g5 h4 10 126 8827 9043638 Qd2+ Kxg4 Qe3 b5 axb5 a4 bxa4 b3 Qxb3 g5 11 136 9810 10023915 Qd2+ Kxg4 Qe3 b5 axb5 a4 bxa4 b3 Qxb3 Kf4 Qc4 12 176 10617 10773302 Qd2+ < + > Kxg4 Qe3 b5 axb5 a4 b6 Qf2+ Qxf2 Kg5 axb3 12 256 10617 10774346 Qd2+ < + > Kxg4 Qe3 b5 axb5 a4 b6 Qf2+ Qxf2 Kg5 axb3 12 496 10617 10775253 Qd2+ < + > Kxg4 Qe3 b5 axb5 a4 b6 Qf2+ Qxf2 Kg5 axb3 12 557 13753 13909919 Qd2+ Kxg4 Qe3 b5 axb5 a4 b6 axb3 b7 b2 Qe2+ Kg5 13 597 16104 16174968 Qd2+ < + > Kxg4 Qe3 b5 axb5 a4 b6 Qf2+ Kxf2 h4 b7 axb3 Qxb3 13 677 16137 16214053 Qd2+ < + > Kxg4 Qe3 b5 axb5 a4 b6 Qf2+ Kxf2 h4 b7 axb3 Qxb3 13 793 20202 20304119 Qd2+ Kxg4 Qe3 b5 axb5 a4 b6 axb3 b7 b2 b8=Q Qf2+ Qxf2 b1=Q 14 833 25936 25339064 Qd2+ < + > Kxg4 Qe3 b5 axb5 a4 b6 Qf2+ Kxf2 h4 b7 axb3 Qxb3 h3 14 889 37240 36327226 Qd2+ Kxg4 Qe3 b5 axb5 a4 b6 axb3 b7 b2 b8=Q Qh1+ Kxh1 b1=Q+ Qg1+ Qxg1+ Kxg1 g5 15 889 74182 70299908 Qd2+ Kxg4 Qe3 b5 axb5 a4 b6 axb3 b7 b2 b8=Q Qh1+ Kxh1 b1=Q+ Qg1+ Qxg1+ Kxg1 g5 Total nodes:170086131 n/sec:94700 (Q-nodes:7% max depth:38) Stan
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