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Subject: Re: Rybka's NPS - one presumption

Author: vladan

Date: 06:32:43 02/17/06

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On February 16, 2006 at 21:30:22, Dann Corbit wrote:

>On February 16, 2006 at 20:47:25, vladan wrote:
>>After some hot messages about Rybka’s NPS, I must say something (I was told it
>>also to my friend Djordje Vidanovic) two months ago.
>>It is obvious that Rybka’s NPS is not programs real NPS.
>>It is impossible that program with lowest NPS compared to other engines achieves
>>depths sand playing strengths above 2850 (or 2900) ELO points, the best of all!
>>But, I am not sure that Vasik did purposely tune down real NPS. The only
>>explanation for that will be that he tried to hide Rybka’s origin in some other
>>public source engines. But Rybka’s plays much different and superior chess,
>>which implicates me that Vas however did original and good job with his engine.
>>Of course, as he said, he used ideas, maybe some source portions or solutions
>>from Fruit, but it is irrelevant if he added (and that is the case) his original
>>code somewhere, which amplifies playing strings for a major margin. It is not
>>cloning. If it is, all of us are monkey clones (with 95% same DNK with our
>>primate relatives :)
>>Maybe, Vasik counts not all generated nodes, not only terminal (leaf) nodes
>>without quiescent generated ones. Each terminal node expands to 2-20 q-search
>>nodes, depended on q-search heuristics (if program has only captures, or checks,
>>promotions etc.). This presumption explains why Rybka’s NPS varieties and drops
>>significantly in positions where exsist much checks, or recaptures, and stay
>>stable at high level in strategically (quit) positions.
>It's a tempest in a teapot, anyway.  The proof of the pudding is in the eating.
>Whether he processes 1 NPS or 1e9 NPS, the program plays like some child of
>Kasparov and Polgar.

Yes, Kasparov said that he can only devolop 2 NPS.

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