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Subject: Re: Stalemate prevention: Simple endgame position finds after 13 half moves

Author: blass uri

Date: 10:28:24 07/26/00

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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



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