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Subject: Re: ELO gain from Tablebases

Author: Robert Hyatt

Date: 05:02:52 03/22/99

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On March 21, 1999 at 21:04:55, James T. Walker wrote:

>I played 100 games with Crafty 16.5 vs Crafty 16.5 with all 3/4 man tablebases
>and a few 5 man tablebases in an attempt to determine how much help the
>tablebases are.  Has anyone else done this and if so, what was the result?
>The final score was Crafty w/tb +32 =38 -30 or 51 to 49.  The first 50 games
>were very different from the second 50 games even though the match was
>uninterrupted for the 100 games.
> First 50   Crafty w/tb +21 =15 -14
> Second 50     "    "   +11 =23 -16
>It looks like two different programs.  Just shows that even 50 games is not a
>large enough sample to prove anything.  I still don't know what the ELO gain is
>from tablebases !  I'm planning on a couple hundred more games later this week.
>If anyone else has done this (Bob?)  please post your results.
>Jim Walker
>P.S. These were only Game/5 minutes.


I haven't tried this and have no idea.  I think the affect is 'minimal' but
not insignificant, whatever that means.  :)  But against 'good' programs I see
a fair number of tablebase games, that are likely won instead of drawn, or
drawn instead of lost, only bacause of the tablebases.



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