Author: Omid David Tabibi
Date: 17:12:09 06/14/04
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On June 14, 2004 at 19:20:57, Anthony Cozzie wrote: >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 > >Zappa doesn't get it either (gxh5 @ 15 ply after 1 minute). Zappa relies on >double nullmove for zugzwang avoidance. This works find for positions with 1 >zugzwang, but in this position black gets hit with about 10 of them :) Ehem, ehem, heard about verified null-move pruning? :) > >anthony
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