Computer Chess Club Archives




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

Author: Stuart Cracraft

Date: 22:44:46 12/15/05

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On December 15, 2005 at 20:03:47, Sergei S. Markoff wrote:

>>Really? Just the line from fruit:eval.c:
>>  eval = ((opening * (256 - phase)) + (endgame * phase)) / 256;
>No. Not just this line, but the concept and well tuning.
>>I find that VERY hard to believe. That concept has been around a
>>very long-time.
>Really? Where it was introduced by the first time?

I don't know about the first time but Stanback had it in GNU Chess
decades ago.

>There was a lot of material-dependent evaluatation factors, but its was tuned
>independently. The result for the most engines that used this approach was bad
>consolidation ability.
>>We need specifics. I see nothing special about Fruit 2.1 evaluation
>>to explain the strength.
>Lets experiment with it. It's easy to remake Fruit search to make it same to the

Yes, that *is* always the best. :-)

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