Author: Robert Hyatt
Date: 13:52:46 12/08/00
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On December 08, 2000 at 15:25:06, Torstein Hall wrote: >On December 08, 2000 at 14:47:37, Dann Corbit wrote: > >>[D]2r3k1/5p2/1p2pp1p/pPq5/Pn6/1B6/1P2QPPP/3R2K1 w - - 0 25 >> >>It seems some programs get the right answer immediately (e.g. Phalanx) and >>others simply never find it. >> >>My question is, "Why?" >> >>I tried programs that don't do NULL move, and that did not seem to help. So >>what is preventing programs from finding the right choice? > >...and Bxe6 is the right move I guess!? > >Found by Gambit Tiger in a split second > >Torstein You can find this one of two ways. You give up a piece for potentially three pawns + no king safety for black. If this were all there is, it would be a mistake as white is a piece down. But there is more. Going deep enough, black has to give the piece back, and white simply ends up winning a pawn, period. It is not hard to make any program like this. Crafty hates the idea of giving a piece for three pawns because 90% of the time that loses. It has to see the "meat" before it will "bite". Which takes 14 plies and 3-4 minutes on my xeon. If a program has big scores for king safety, it will probably bite on this instantly. If not, it will have search deep enough to see that black has to sac the knight to avoid getting mated, leaving white a pawn up in what might still be a drawn ending (both sides have pawns, plus rook and queen each.
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