Computer Chess Club Archives




Subject: Re: Rybka uses PVS and not MTD(f). Its no Fruit-Clone

Author: Vasik Rajlich

Date: 10:00:59 12/12/05

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On December 12, 2005 at 04:58:52, Chrilly Donninger wrote:

>I did not follow the CCC-discussion the last months/years. So please do not
>"kill" me if I am telling old stuff. I got questions about Rybka from the
>Hydra-sponsor so I read yesterday evening some of IM Vasik Rajlichs very
>interesting postings in the archive.
>Vasik mentions several time MTD(f) and his experience with it. But when playing
>with Rybka, it looks like a normal PVS-search. I looked therefore also in the
>Rybka-Code. What I have seen so far is typicall PVS-Code.
>From this first look I can say that Rybka is not at all a Fruit clone.

Yes, I dropped MTD (f) a long time ago - it just doesn't work. In the best case
you save a tiny handful of nodes, and for this you have to live without true
bounds in the search. Even very simple things like how to do a null move become
really complicated.


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