Author: Robert Hyatt
Date: 18:50:20 06/21/98
Go up one level in this thread
On June 21, 1998 at 20:46:16, Vincent Diepeveen wrote: > >On June 21, 1998 at 15:59:33, Moritz Berger wrote: > >>On June 21, 1998 at 14:26:38, Ernst A. Heinz wrote: >> >>>On June 21, 1998 at 13:08:40, Vincent Diepeveen wrote: >>>> >>>>You can fill 300MB easily. >>>> >>>>Especially fritz. >>>> >>>>If you don't clean your hashtable (and fritz doesn't do this), then [...] >>> >>>Vincent, >>> >>>You are the first to claim that "Fritz" does *not* clear its hash tables >>>after each move. Up to version 4, "Fritz" definitely did it ... >>> >>>Where do you get your knowledge from? >>> >>>According to my own experiences when playing "Fritz 5" I guess that it >>>still clears its tables -- the first iterations just do not seem to fly >>>by as they should if the tables remained intact. >>> >>>=Ernst= >> >>I observed that Fritz doesn't neccessarily find its own move from a previously >>computed very deep PV (e.g. 15 ply or something) in the next move very soon. So >>not even move ordering at depth-2 ply seems to be used. I certainly don't know >>for sure, but would like to know Vincent's source of information. Maybe it's >>gonna be news even for Frans Morsch ... > >Indeed weird, where fritz3 seems to suffer from this, fritz5 seems to repeat >itself >over and over again. Weird. So fritz3 not cleaning and fritz5 does. > >So it has become even dumber, now relying on piece square tables. >That explains quite a number of things. >. >>Moritz also note that there are "levels" of clearing the hash. For example, I *never* go through and zap everything. I do, on occasion, go through and clear the scores only, if something changes seriously enough at the root that I change the eval. For example, once development is complete, at the root, I turn off EvaluateDevelopment() and I have to "scrub" scores from the hash table as they would then be wrong. But I leave the other stuff (move, threat flag, etc) alone...
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.