Author: Albert Bertilsson
Date: 05:46:53 06/26/03
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On June 26, 2003 at 08:30:19, Peter Fendrich wrote: >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. Seems like a good solution, specially if I add more extensions later. Although I'd still like to figure out some clever way to figure out when to stop extending, to allow extending when it's leading to something good. > >/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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