Author: Shane Booth
Date: 21:29:08 01/04/99
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On January 04, 1999 at 18:06:41, Robert Hyatt wrote: [lots snipped] >I'm not sure about depth... but I'd guess that in blitz games, the middlegame >depth is in the range of 9 plies, maybe 10 (of course in some wild positions it >might only be 8 or so as well). > >As far as what does a ply do for crafty? hard to quantify, but clearly every >ply is important. IE the p6 was about 2.5X the P5/133 I used and its >rating took a big jump. The quad p6 gave another factor of 3 and another >noticable jump, and now the quad xeon (which ramps out at about 2x the quad >p6, roughly) is another noticable jump. So far, I see *no* indication that >another ply won't produce a better search result... > >what we need is for someone to organize a crafty vs crafty tournament, no >pondering, and try one with sd=4 against sd=5,6,7,8,9,10 (at least). Then >do sd=5 vs 6,7,8,9,10, then sd=6 vs sd=7,8,9,10 and so forth. That would >give a good graph of what another ply (or more) is worth for crafty... I have been running a similar experiment recently, playing Crafty 15.20 against CM4000 using search depths of 1-10 for Crafty and 1-8 for CM4000. I've only played 300 games so far (so 30 games for each search depth for Crafty), so the statistical error in the results is still quite high. Anyway, here's what I have so far: (Fixing the rating of 1 ply Crafty arbitrarily to 600) Depth Crafty CM4000 1 600 655 2 793 1012 3 1072 1401 4 1365 1422 5 1575 1711 6 1677 1791 7 1697 2027 8 1940 2198 9 2076 10 2242 Crafty has learning turned off, and games between the same opponents are never played with the same opening. Regards, Shane
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