Author: Uri Blass
Date: 16:42:09 07/28/04
Go up one level in this thread
On July 28, 2004 at 18:48:05, Dann Corbit wrote: >On July 28, 2004 at 07:06:22, Uri Blass wrote: > >>On July 28, 2004 at 05:53:57, Tord Romstad wrote: >> >>>On July 28, 2004 at 00:36:12, Dann Corbit wrote: >>> >>>>Play with the granularity of the search. If a pawn is worth 64 centipawns you >>>>will do far less searches than 1000 centipawns. But then you lose resolution. >>>>So the trick is to find a happy medium, I would guess. >>> >>>I have actually used pawn=32 since quite a long time (if I recall correctly, >>>Gothmog 0.4.6 and later use pawn=32, older versions used pawn=64), and I haven't >>>seen any bad effects of the low resolution. The internal resolution in my >>>evaluation function is pawn=128, but I divide all scores by 4 before I return >>>them. >>> >>>Tord >> >>How much rating do you earn from dividing the evaluation by 4. >> >>I use pawn=100 and I do not divide my evaluation by 4 before returning them. >>Maybe it is a bad idea but I am not sure. >> >>Note that I am not sure if tactical tests will help to find it and I guess that >>the only way to know is games because it is possible that you pay the price not >>in tactical positions but in positions when you choose slightly inferior >>positional moves. > >You do not use MTD(f). If you use PVS, then a resolution of 20 significant >digits is the same as 3 digits for speed. I am not sure about it. I never tried so I do not know but intuitively small resolution can help also for pvs programs because you may avoid unimportant fail highs of 0.01 pawns and the program is going to change less it's mind so it is going to find tactical ideas faster. I may have 1.e4 0.00/10 1.d4 0.01/10 1.Nf3 0.02/10 All these changes because of small difference take time and it may be better to get deeper to depth 11 and keep the score as 0.00 and only fail high for difference of 0.03 pawns or more than it. if I fail high for difference of 0.01 I may not get deep enough to get more important fail high of 0.03 at depth 11. Uri
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.