Author: Vincent Diepeveen
Date: 10:19:33 12/30/02
Go up one level in this thread
On December 30, 2002 at 02:20:53, Uri Blass wrote: In this case test it before shouting about it. i assume you throw nullmove out of movei and then look whether you get 15% with it? >On December 28, 2002 at 19:03:33, Tony Werten wrote: > >>On December 28, 2002 at 16:03:46, Uri Blass wrote: >> >>>On December 28, 2002 at 15:39:08, Tony Werten wrote: >>> >>>>On December 28, 2002 at 14:17:17, Alessandro Damiani wrote: >>>> >>>>>[snip] >>>>> >>>>>> >>>>>>the problem of most 'reductions' is the hard fact that you lose a full ply >>>>>>near the root. >>>>> >>>>>That's why reductions are not done in every node, but under certain conditions. >>>>>The quality then depends on those conditions, of course. Therefore, reductions >>>>>are not bad per se. >>>> >>>>This was about recursive reductions as FHR. What happens is at a ply you decide >>>>to reduce depth, but 2 ply later, the conditions are still met and you reduce >>>>another ply etc. >>>> >>>>I dumped them because they cost to much tactical strenght. Ed's nonrecursive way >>>>seem to give me a 5% node reduction. Not bad for 2 minutes work. >>>> >>>>Tony >>> >>>The question is still if it does not cost too much tactical strength. >>> >>>It is not clear if being 5% faster in 95% of the cases and seeing tactics one >>>ply later in 5% of the cases is a good idea. >> >>I had no case where I saw tactics one ply later. But then again, I didn't have >>the 15% speedup Ed mentioned either. >> >>Personally, I think I prefer the "safe" 5%. > >I believe that more than 5% can be gained and the point is that if you get only >5% you need to check a lot of positions to verify that seeing tactics one ply >later is rare enough to justify pruning. > >I believe that better conditions can be used for reduction and the gain should >be more than 15%. > >I did not test it in movei because I already have different rules of pruning >based on evaluation. > >Uri
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