Author: Robert Hyatt
Date: 07:58:36 02/25/04
Go up one level in this thread
On February 25, 2004 at 09:13:43, martin fierz wrote: >On February 25, 2004 at 07:02:11, Dieter Buerssner wrote: > >>On February 25, 2004 at 05:56:16, martin fierz wrote: >> >>>it won't pop *my* eyes. i once reduced hash key sizes in my checkers program >>>beyond all sensible settings, because there was a discussion here about whether >>>you really need 64-bit keys. in my checkers program, i have 64 bit keys, but >>>effectively it's only using about 52 bits. i have about a 20 bit part which is >>>used for the hashindex with %, and of the remaining 44 bits i store only 32 as a >>>check. i reduced those 32 down to about 8 (!!) bits and in 100 test positions >>>only saw one different move played IIRC. ridiculous, i must have lots of >>>collisions there. unfortunately, i didn't count the collision number, or write >>>down the results - but i know what you're talking about! >> >>Almost the same experiment with my chess engine (inluding many details, like the >>effective number of bits used, and going down to 8 bits only): >>http://chessprogramming.org/cccsearch/ccc.php?art_id=190318 >> >>Regards, >>Dieter > >hi dieter, > >i had forgotten about your post on this, but now i remember it. very similar to >my observations, and if only we had written our observations up a bit more >seriously we could have written the paper that bob is publishing now ;-) > >cheers > martin Hey, I'm easy to get along with here. :) I have already asked one other person to do some similar testing. I'd be happy to tell you both what I have done, and have you run similar tests, and join me as authors on this paper. I am doing the test slightly different, as rather than a specific number of signature bits, I am forcing a particular error rate (ie one error every N nodes) with the idea being that I should be able to choose N in 1 error every N nodes such that the score never changes, or the score changes or not the best move, or the best move changes but it is not a bad change, or the best move changes and it probably changes the game outcome. If either/both are interested, email me and I can send you a draft, which explains how I am testing, and includes the test positions I am using. I have some endgame positions (ie like fine 70), some sharp tactical positions like the Ba3 Botvinnik-Capablanca move, and some plain middlegame positions from games Crafty played on ICC. Let me know if you are interested...
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.