Author: Don Dailey
Date: 12:56:18 08/02/98
Go up one level in this thread
On August 02, 1998 at 14:38:28, Komputer Korner wrote: >On July 31, 1998 at 12:26:57, Amir Ban wrote: > >>On July 31, 1998 at 09:34:58, Komputer Korner wrote: >> >> >>> >>>I believe that Fritz 5 is a full width searcher with an excellent null move >>>algorithm. In fact the manual says it is a full width searcher. >>>-- >>>Komputer Korner >> >>Don't understand your meaning. It certainly uses some extensions, and it uses at >>least null-move for forward pruning, so it does both extensions and pruning like >>the rest of us. So what does the "full width" bit mean ? >> >>Amir > >The full width means that it does consider every move and doesn't prune these >out at an early ply. AS you know every selective searcher does full width to >some minimum ply depth, but full width searchers will still calculate every PV >at a deep ply level. BTW, what would you classify Junior as? >-- >Komputer Korner KK, I disagree with your definition of full width. Fritz is about as selective as any program I know. As soon as you do a null move you fail to be full width, since the resulting position is not a normal position. You are actually doing a test for selectivity to see if you will persue a given line of play. In effect, Fritz does not even do a full width 1 ply search since no quies is actually performed on some of the moves. The depth reduction of null move makes it seem as if you are really doing reduced depth full width searching, but the reality is that you are not, although the effect is quite similar. - Don
This page took 0.01 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.