Author: Stuart Cracraft
Date: 18:21:48 12/28/05
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On December 28, 2005 at 16:25:02, Uri Blass wrote: >On December 28, 2005 at 16:04:28, Tord Romstad wrote: > >>On December 28, 2005 at 15:31:55, Roman Hartmann wrote: >> >>>On December 28, 2005 at 15:27:34, Dann Corbit wrote: >>> >>>>How are you calculating mobility? >>>>A 10:1 loss in speed is very traumatic. >>>>Unless you are only counting wood in your evaluation, you should not see that >>>>traumatic of a degradation. >>> >>>Several problems: >>>-outdated board design 10x12 >> >>16x12 may be slightly more convenient, but 10x12 isn't outdated >>at all. There is no reason why mobility evaluation should be expensive >>on a 10x12 board. >> >>>-legal move generator instead of pseudo legal >> >>You shouldn't generate moves at all when evaluating mobility. This >>is almost certainly the main reason why you see such a big slowdown. >>When you generate moves, you do a lot of work which is not necessary >>when you just want to evaluate mobility. You don't need the moves >>at all, just the number of moves. Perhaps you can even omit some >>piece types. I don't evaluate pawn or king mobility at all (in my >>experience, there are better ways to evaluate king activity), and I >>have never seen any measurable difference in strength when I >>switch queen mobility on or off. >> >>Tord > >I also do not see a reason for slow down that is so big. > >being 1.3 times slower make sense but not being 10 times slower. > >Note that the idea of not calculating mobility for pawns or for the king is idea >that I learned from fruit that I also think to try. > >originally it was hard to do it because of the bad design of movei but I believe >that after the changes that I did it may be easier to do it later in Movei. > >Uri Trying to understand nps differences is a recipe for no happiness. I have changed my tune and advocate looking at play quality too. Don't slip back where I used to be too. Stuart
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