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Subject: Re: Rook endings evaluation

Author: Sergei S. Markoff

Date: 23:08:54 12/06/02

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Hi!

>Crafty
>Pepito
>Amy
>ExChess
>Arasan
>
>Lots more besides these, of course.

 OK, I learn Crafty sources very good. With Pepito I have troubles because I
don't know Spanish ((:
 SmarThink is a bitboard engine. But it not uses rotated bitboards. Instead of
doing this I have a little different but not much faster approach.

>Some typical tricks:
>Have a table of precomputed distances to find out if the king can catch the
> pawn or not.

 I have the same tables and also integrated tables for K+P vs P. But I use this
tables in pure pawn endings.
 Crafty also not uses "catch" tables in rook endings. It's surprize for me
because I think that, potentially, clever using of this tables must be a good
advantage for fine evaluation. But I may be wrong because now I'm not tried to
do it...
 A few words about Ruffian. Ruffian is very good in endgames. But I think that
Ruffian's strength in endgames based not on lot of knowledge but on very clever
pruning/(or extending?) techiques.

Sincerelly yours,
Sergei



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