Author: Wayne Lowrance
Date: 14:08:05 02/25/04
Go up one level in this thread
On February 25, 2004 at 10:58:36, Robert Hyatt wrote: >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... Very impressive ! My respect for Bob is very high, always has been. My only problem with Bob is his bickering> But Bob aint gonna take nothin from any one. :) Wayne
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