Author: Andrew Williams
Date: 10:38:24 07/26/00
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On July 26, 2000 at 13:28:24, blass uri wrote: >On July 26, 2000 at 12:44:56, Jonathan Lee wrote: > >>Here's the position: >>White pawns on a5, b2, and c4 >>White rook c7, White king d4 >>Black rook e2, Black king a6 >>White to move: >>For the first 11 or 12 half moves, the computer moves pawn b2-b4, but that's a >>stalemate. >>This is an example of inefficiency (relatively speaking). >>This position was given to me by Master Mark Ryan (not Mark Ryan on this CCC at >>Vancouver, Canada). >>Does anybody have a chess engine that can make this position run much faster >>(disregarding hardware)? >>Jonathan (49th message) > >Hiarcs6 can reject b4 in 9 plies(it does not see the draw but there is a score >drop at depth 9 and it changes its mind). > >Hiarcs7.32 needs 11 plies to see the draw at depth 11 and there is no score drop >in previous plies. > >Uri This is the diagram: [D]8/2R5/k7/P7/2PK4/8/1P2r3/8 w - - 0 1 My program can't sort this out unless I make a few moves first. It is not able to identify the perpetual check (which Black offers in an attempt to get White to take its Rook) as a draw. Andrew
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