Author: Matthew White
Date: 12:32:09 03/27/03
Go up one level in this thread
On March 26, 2003 at 11:34:59, Robert Hyatt wrote: >On March 26, 2003 at 11:11:30, Peter Berger wrote: > >>On March 26, 2003 at 11:02:06, Robert Hyatt wrote: >> >>>On March 26, 2003 at 06:28:52, Peter Berger wrote: >>> >>>>These can be tough or very easy depending on engine - some engines seem to know >>>>too much here. They are also interesting for humans I think. >>>> >>>>6k1/p4p2/6p1/1P2p2p/4q2P/4Q1P1/P4P2/6K1 b - - 0 1 >>>> >>>>1..Qxe3! wins for black. >>> >>>I don't think these are about "knowledge". They are about "search" since the >>>first position >>>has blacking giving white an outside passed pawn with the two to one majority on >>>the >>>queenside. >> >>Maybe. Crafty is one of the engines that has quite a hard time with this >>position as is Ruffian (that has even more problems). So I think it is about >>knowledge, or maybe about tuning?! > >I don't think so, for the reason that white has what appears to be a won ending >if >queens are removed, because of the 2-1 distant majority. Crafty understands >this >perfectly well. And it takes it a while to see that the king is in just the >right position >so that black's eventual threats can't be met properly. > >Both have the same basic motif, a 2-1 queenside majority. The second is simply >not a >problem for Crafty because of its knowledge about the potential distant passed >pawn. >The first is more of a problem in that it requires a deep search to discover >that the >distant passed pawn knowledge really doesn't apply. > Couldn't most positional knowledge be found given a deep enough search? If a program has the knowledge, a deep search isn't necessary. For example, a pawn move in the opening may cause a permanent weakness that may not be exploitable for 30 moves, however, without searching to that depth, a program might make that move and never see the problem coming. (SNIP!) Regards, Matt
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