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Subject: Re: Secrets of Rybka and Fruit from my point of view

Author: Uri Blass

Date: 16:57:45 12/15/05

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On December 15, 2005 at 19:38:51, Stuart Cracraft wrote:

>On December 15, 2005 at 19:18:37, Uri Blass wrote:
>>
>>I also agree and I never underestimated fruit's evaluation.
>>It is possible that the main reason for it's superior evaluation is the idea of
>>average between opening and endgame but it is fact that it has a superior
>>evaluation.
>
>Really? Just the line from fruit:eval.c:
>
>  eval = ((opening * (256 - phase)) + (endgame * phase)) / 256;
>
>I find that VERY hard to believe. That concept has been around a
>very long-time.

I do not read much source code of free programs so I do not know but I wonder
if free source code programs before fruit use that idea and have for every term
endgame evaluation and opening evaluation.

I use it for some things and I learned the idea from fruit but most of my
evaluation does not use that idea and I may rewrite the evaluation and test.


>
>You must propose something better.
>
>Superior evaluation?
>
>That code is trivially small.
>
>So, small is beautiful?

bigger has the potential to be better but it is not always better.
I believe that Rybka's evaluation is even better than fruit's evaluation but
fruit's evaluation is better than the evaluation of most top programs including
Shredder9.

Uri



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