Author: José Carlos
Date: 06:48:11 05/22/03
Go up one level in this thread
On May 22, 2003 at 09:06:24, Uri Blass wrote: >On May 22, 2003 at 08:41:56, Ulrich Tuerke wrote: > >>On May 22, 2003 at 06:08:47, José Carlos wrote: >> >>>On May 22, 2003 at 01:01:38, Robin Smith wrote: >>> >>>>Often programs will underpromote a pawn in situations where they think capturing >>>>the (under)promoted piece is still the best reply. Can anyone give an example >>>>from an actual game where this underspromotion cost the computer a 1/2 point? >>>> >>>>Robin >>> >>> I can't recall any game with this problem, but it's really easy to fix. I >>>simply order the promotions so that promoting to queen gets searched first. >> >>Isn't everybody doing this anyway ? >>Uli > >I do it and I strongly believe that shredder does it >but it is not enough to prevent the problem. > >Movei does not use hash tables for pruning and I >think that it may be interesting to read an explanation >for the behaviour of shredder or another program >that considers c1R as best. > > >I think that in order to prevent the problem a program >can ask itself if an underpromotion makes sense before >considering it and I plan to add it in the future > >I do not need hash tables and killer moves >are enough for it. > >I simply need to tell the program that if the killer move of >queen promotion is capturing it then it should not consider underpromotions. > >Uri You shouldn't consider captures as killers, because it's a waste, as you're most probably searching good captures before killers. Promotions should be considered as captures in this regard. José C.
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