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Subject: Re: Problem with extending to maxdepth

Author: Peter Fendrich

Date: 05:30:19 06/26/03

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On June 26, 2003 at 08:11:23, Albert Bertilsson wrote:

>Hi Everybody!
>
>Previously I've used check-extensions, and now I added single-reply extensions.
>This has given me some problems because it seems that the engine tries to extend
>to much now! Some positions are just searched to very few plies. I guess it has
>to do with one side only having one move to do (single-reply) and the other side
>constantly checking, and this makes the search go deep immediatly and not
>returning until searching to max depth or getting 3-fold repetition.
>
>I've solved this temporarily by only allowing to extend at most Depth plies, so
>when searching to ply 6 maximum search depth should be 12 plies. Anybody have a
>better idea?

One way to deal with it is to use "fractions of ply". Let's say you search to
depth=6 and calling search(depth-1,....) you would instead search to depth=600
(for instance) and doing search(depth-100,...)
Now you can extend for instance 90 and acter a while you can't go deeper.
With this method you can also get more reasonable values for less important
extensions.

/Peter

>Forgive me for interrupting the other threads with this computer chess related
>question. This is still the computer chess forum?

:-)

>/Regards Albert



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