Author: Uri Blass
Date: 13:25:02 12/28/05
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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-outdated board design 10x12 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16x12 may be slightly more convenient, but 10x12 isn't outdated 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
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