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Subject: Re: Three Positions

Author: Gerd Isenberg

Date: 14:51:06 11/20/03

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On November 20, 2003 at 16:45:27, Dieter Buerssner wrote:

>On November 20, 2003 at 15:20:59, Gerd Isenberg wrote:
>
>>Three Positions, one is mate in 13 (Shredder - IsiChess WMCCC02).
>>Any static eval or king safety heuristic to choose the best one for white if
>>leaf nodes ;-) ?
>
>Interesting. I would think, there is no slightly easy way without search. Even
>if one engine would prefer pos two - I think it would be mostly luck.
>
>How to prefer pos 2 can be easy. Evaluate pins, evalualte more advanced pawn
>better. In 2 positions, the Q pins the R. So depending on the "advanced pawn
>bonus" vs. the "pin bonus" a primitive eval can choose the right pos at a leave
>node (however it seems, that one will never compare all 3 positions from the
>same node).
>
>Regards,
>Dieter

Hi Dieter,

some general properties in this open queen-rook endings with a lot of open
files, where king safety and pawn shield matters a lot, may be the abilty to
have some defending squares on opponent's checking rays. See my reply to John.

Regards,
Gerd



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