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Subject: Re: Rook & Pawn Ending with Perpetual Check and Stalemate

Author: Frank Schneider

Date: 11:57:27 03/31/01

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On March 31, 2001 at 09:22:57, Ferdinand S. Mosca wrote:

>Hi everyone,
>
>A position from an actual game which caught my interest while
>playing an engine match at G60.
>
>[D]3r4/5k2/5p2/6pp/5p2/1p6/p2R4/K3R3 b - - 0 1
>Is there any program that can evaluate this simple ending logically.
>
>The trap here is the move ...Rxd2, this may not win but it only draws.
>There is perpetual check and stalemate if black plays ...Rxd2. Many programs
>probably find the perpetual coming, but at what time do your favorite programs
>give a 0.0 or near 0.0 score?

Gromit 3.8.2 avoids Rxd2 after <1sec and prefers Rb8.

Frank

>
>If it finds the perpetual check, which it can find, would a program dare to play
>the black side kr+pawns vs. krr?
>
>This position is actually not a draw but a win by black.
>I think ...Rb8 will win or maybe other moves.
>
>[D]3r4/5k2/5p2/6pp/5p2/1p6/p2R4/K3R3 b - - 0 1
>
>Regards,
>Dinan



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