Author: Robert Hyatt
Date: 13:24:41 11/28/03
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On November 28, 2003 at 16:17:22, Peter Berger wrote: >Subject: Junior - Crafty NPS Challenge - a user experiment > >-------------------------------------------------------------------------------- > >[ Post Followup (without quoting) ] [ Post Followup (with quoting) ] [ Computer >Chess Resource Center ] [ Message Listing ] > >-------------------------------------------------------------------------------- > >Posted by Peter Berger (Profile) on November 21, 2003 at 16:47:52: > > >Following recent heated discussions I'd love to do a little testmatch. There are >different versions of the challenge online - I chose one that I can kind of >simulate myself with slower hardware. > >Junior 8.0.0.2 will play on a P233MMX, 32 MB RAM. >Crafty 19.4 will play on a PIV2.0GHz notebook, 1GHz RAM. > >Time control will be game in 2 hours with 10 seconds increment/move. The match >will be done like older FIDE world championship matches - the first one to win 6 >games wins the match, draws won't count. That might explain the time usage. game/2 hours means you have to be careful. What Crafty does is to set the target time to remaining/35 + increment. IE if there is 35 minutes left in your time control, it will try for 70 seconds for the current move. 35 / 35 = 1, + 10 secs increment... That tends to prevent losses on time, but can be a bit conservative. I might look at that divisor at some point in the future... A more common time control might be 40/120, then sudden-death in 30 or something similar, which I have tested more. I have not played in a sudden-death game on the first time control, since maybe 1977 or so where I played in a "tornado" that was simply game in 60 minutes... > >Junior uses 16MB Hash, 3+4 men tablebases, 1MB cache, junior8.ctg. >Crafty uses 384MB Hash, 64MB hashp, 3+4 men tablebases, 32MB cache, own book, >aware of playing a computer. > >Compairing setups with Crafty bench (hash 12M, hashp 3M, cache 1M on the slower >one) suggests a speed difference factor of about 10.5 in raw nodes per seconds >and 11.0 in "SMP time to-ply-measurement" between the two computers. >As the Junior Mark doesn't work on the slower one and Junior chooses to search >different depths on both in the starting position, I can't really give a number. >The difference seems to be slightly lower for Junior though, sth like 9.0 maybe. > >Saying that the faster computer is about 10 times faster shouldn't be too wrong. > >That's also clearly an upper-bound for faster hardware Crafty could reasonably >come up to compete with against a single-CPU opponent in a current competition >on fast computers IMHO - the speedup demands 16 CPUs I guess, and I don't know >if Crafty can really scale that well. > >With this setup Crafty should be the clear favourite I suppose. > >Crafty won the toss and will have the white pieces in the first game. > >Peter
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