Author: Uri Blass
Date: 06:55:40 06/26/03
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On June 26, 2003 at 09:43:34, Albert Bertilsson wrote: >On June 26, 2003 at 09:04:59, Uri Blass wrote: > >>On June 26, 2003 at 08:46:13, Martin Bauer wrote: >> >>>On June 26, 2003 at 08:11:23, Albert Bertilsson wrote: >>> >>>>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? >>> >>>I think the maximum number of extensions should be limited. I limit to an fix >>>number (7) independent of the depth, but your idea sound logical, too. >> >>I do not limit extensions in movei. >>I do not like that idea and I prefer to get bugger depth by adding pruning. >> >Do you avoid getting to deep by having pruning rules or do you have fractional >depth increases to limit the extending? I have both of them but I have no limit for the number of extensions based on the depth. I may extend more than one ply(but less than 2 plies) in part of the cases when the king is in check(dependent on the position and on the number of legal moves) Uri
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