Author: Anthony Cozzie
Date: 18:45:44 06/14/04
Go up one level in this thread
On June 14, 2004 at 20:12:09, Omid David Tabibi wrote: >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 It's a possibility. If I understand it correctly verifications performed nonrecursively. Right now, my goals are "Deep Zappa" aka "ParZappa" aka "Zappa-NUMA" aka "Zappa" and the autotuning stuff; when I get some free time I'll try to give it a shot. Oh, and I have to rewrite my eval again. anthony
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