Author: Robert Hyatt
Date: 08:15:25 11/21/02
Go up one level in this thread
On November 21, 2002 at 02:34:29, Gian-Carlo Pascutto wrote: >On November 20, 2002 at 22:05:29, Robert Hyatt wrote: > >>On November 20, 2002 at 16:55:41, Gian-Carlo Pascutto wrote: >> >>>Nullmove in Deep Sjeng uses an algorithm of my own, but I can >>>switch it back to other systems easily. I did so for running >>>a few tests. >>> >>>I made a version which uses Heinz Adaptive Nullmove Pruning >>>and a version which uses your verification nullmove. >> >>This would seem to be a bit harder than at first glance. They say that >>if the normal null-move search fails high, then do a D-1 regular search >>to verify that, but while in that verification search, no further >>verification searches are done, meaning that the normal null-move search >>fail-high is treated just like we do it today.. >> >>I'm going to experiment with this myself, just for fun, but it seems that you >>need to pass some sort of flag down thru the search calls indicating that >>you are either below a verification-search node or not so that recursive >>verification searches are not done... > >Uh, considering psuedocode is given, this is a pretty braindead thing >to implement. Yes, you need to pass a flag down, as is illustrated in >his code. > >The only tricky thing is the research on zugzwang, but I guess botching >that is not as critical if you run purely tactical tests? hard to say. Sometimes not moving is a good thing in the middle of a wild tactical blast... > >-- >GCP
This page took 0.05 seconds to execute
Last modified: Thu, 07 Jul 11 08:48:38 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.