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Subject: Re: How much does tablebases affect the playing strength of Crafty

Author: Robert Hyatt

Date: 12:34:05 05/17/00

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On May 17, 2000 at 15:10:51, Jerry Adams wrote:

>Hi
>
> My Crafty has been losing won positions because of it's horrible endgame. At
>present I have absolutely no tablebases. I was under the impression that
>tablebases would only account for a few additional rating points. Iv'e seen
>crafty actually draw when it had a rook and King against a King!!! Question: How
>can I build tablesbases without using alot of harddrive space? I only have a 4
>gig hardrive. I would like crafty to be able to atleast win rudimentary
>endgames. I am using winboard.


If it draws with rook and king vs king, you have something broken.  It has
specific code for such 'mating position'.  I have had it play hundreds of games
with itself, one side using egtb's, the other not.  It has never failed to mate
with KR vs K easily.  Not "optimally" usually, but quickly and easily.

IMHO Crafty is not a "stupid program" in endings.  It handles itself pretty well
most of the time.  Unless something is broken or mis-configured.  If you have a
log.nnn file where it couldn't win KR vs K, that might tell what was happening.



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