Author: Marc van Hal
Date: 10:31:06 04/07/01
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On April 06, 2001 at 23:59:55, Tina Long wrote: >Hi guys, >I've done all this before with Rebel Century, I worked for weeks, never formed a > conclusion, so I went to Japan for some months to forget it all. >What I say below about CM8k can also be roughly translated to Rebel Century. >Century has the added benefits (complications) of ONite search syle & the like. > > >Following brief discussion of CM8k personalities in >http://www.icdchess.com/forums/1/message.shtml?161873 >I tried a little research. > >I'm interested in CM8k playing at 1 hour and 12 hours per move (from the old >Komputer Korner days) on a P3 1ghz computer. > >I was using my Personality "CM128" default CM8k with 128m hash.(selectivity = 6) > >I then tried the same with selectivity = 12 >I then tried the same with selectivity = 2 > >At 12: Depths reached were 1/11, 2/14 & the like. >At 2: Depths reached were 7/9 10/12 & the like. > >2: for the same positions, looked MUCH deeper at "brute force" and only SLIGHTLY >shallower at selective depth than 12:. > >While most moves chosen were the same, when they differed I considered the 2: >were more sound (but then I'm just a dumb human) and more likely to agree with >Hiarcs732 & Tigger14. > >What is the opinion of CCC people on the strength of the decisions made, in very >long time period games or analysis: > >Is it better to have low selectivity and have a MUCH larger safer brute force >search? >Is it better to have high selectivity to have a SLIGHTLY deeper selective depth >search? >What's the benefit of that 1 or 2 extra ply compared to the risk of not checking >the full width beyond 1 or 2 plys? > >I feel the results will differ depending on the particular positions, & I'd be >inclined to have high selectivity in the Early & Middle Game & lower selectivity >in the Endgame. > >BUT I can quite easily see why just the opposite might be best. > >Your Opinions will be appreciated, > >See Ya >Tina Long Playing in tournaments this can give strange results because it will change it mind manny times but tuning the selectivety is a verry important thing for all programs But the right selectivety is diferent for all personeltys cq programs. I hope I wrote something of use Marc
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