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Subject: Re: Crafty CCT6 notes

Author: Tord Romstad

Date: 10:16:46 02/02/04

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On February 02, 2004 at 11:00:08, Robert Hyatt wrote:

>On February 02, 2004 at 10:48:10, Tord Romstad wrote:
>
>>This raises the obvious question:  What do Shredder and Hiarcs do to
>>achieve the bus pushing effect without having a massive hardware advantage?
>>How are they able to outsearch strong and (NPS-wise) much faster programs
>>like Crafty?  They do forward pruning, of course, but I wish I had a better
>>idea of precisely what tricks they use.  One of the many reasons I look
>>forward to the Palm OS version of Hiarcs is that I will finally have the
>>chance to play with the engine myself and see if I can figure out some of
>>its secrets.
>
>I hope you manage.  :)  As to what they do, I don't know.  But I can certainly
>say with some authority that it works pretty well.  :)  But it is more than
>search alone.  IE Shredder seems to have a significant "feel" for a position as
>well.  IE in several Crafty games yesterday, someone would fire up shredder to
>see what it thought.  One such case was where Crafty had +1.0, and Fritz was
>saying "0.0".  Shredder weighed in with +1.0.  And this was all about a
>king-side pawn majority in the Crafty-Hiarcs game.  Hiarcs fits the same mold,
>IMHO.  IE it was at about -1.0 at that same point.  So doing a good evaluation
>_and_ having a good search, is impressive.

I think the two are often interrelated.  It is easier to do reasonably
safe forward pruning with a good evaluation function, IME.

>Perhaps one day someone will figure out their "tricks".  Or someone else will
>develop them again, and avoid the "go commercial" tendency and really produce
>some improvements in computer chess overall.

The probability that I ever (re)invent something really interesting and
effective is very small, but if it happens I will of course not go
commercial or keep my findings secret forever.  However, it could happen
that I will wait a month or two to report about my ideas if I find them
shortly before the next CCT.   :-)

Tord



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