Author: Uri Blass
Date: 13:09:54 09/05/04
Go up one level in this thread
On September 05, 2004 at 15:28:06, Ed Schröder wrote: >On September 05, 2004 at 11:16:31, Uri Blass wrote: > >>On September 05, 2004 at 11:02:17, Ed Schröder wrote: >> >>>On September 04, 2004 at 17:22:40, Uri Blass wrote: >>> >>>>On September 04, 2004 at 17:06:50, Chris Welty wrote: >>>> >>>>>On September 04, 2004 at 17:01:40, Uri Blass wrote: >>>>> >>>>>>Movei does not use hash for pruning. >>>>>> >>>>>>Uri >>>>> >>>>>Interesting. Why not? >>>> >>>>I believe that using hash for pruning limit my possibiloities for improvement >>>>with evaluation that is not dependent only on the leaf position and at this time >>>>there are more important things to do then using hash for pruning. >>> >>>Excuse my ignorance but what is hash pruning? >>> >>>My best, >>> >>>Ed > >>It is what almost every program is using. > >I am pretty sure you are one of the only. > > >>It is returning value based on hash tables because the position was already >>searched in the past with bigger or equal depth. >> >>Movei is not using it and it is using hash tables only for order of moves and I >>believe that it enable more possibilities for evaluation that is not based only >>on the leaf position(for example movei can detect a lot of perpetual checks >>without seeing the draw because it's evaluation suspect the draw after a lot of >>checks so it gets closer to 0 when other programs cannot do it. > >>Of course detecting perpetual check faster is not the only idea that it can be >>used for. > >Last time I checked hash-pruning is good for speedup factor of 2-3 in the >midgame and much much more in the endgame. I think you should reconsider. > >My best, > >Ed I do not think to reconsider(at least not in the near future). I believe that there are a lot of ways to improve movei that contradict using hash for pruning. Of course detecting perpetual checks is not a good reason by itself to justify not using hash for pruning. 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.