Author: Andrew Williams
Date: 12:29:16 08/08/01
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On August 08, 2001 at 15:16:17, Bruce Moreland wrote: >On August 08, 2001 at 14:59:04, Andrew Williams wrote: > >>On August 07, 2001 at 16:03:34, Bruce Moreland wrote: >> >>>I've often heard people state that null move with R=3 is better than with R=2, >>>but I have never ever ever gotten a test result that indicates this. >>> >>>I've tried everything. I've tried it throughout the tree, I've tried it near >>>the root, and I've tried it near the tips. >>> >>>My measurement standard is ECM positions solved, which *always* goes down. >>> >>>What are other people doing that I'm not doing, or are people testing in some >>>other way, if so is their way better or worse? >>> >>>I would test Crafty both ways (it's currently doing R=3 some places), but my >>>machines will be busy until after the WMCCC. >>> >>>bruce >> >>I do something similar to Ernst Heinz's approach with R=3 in some places and >>R=2 in others. At the time I implemented it, I ran some test-sets and found >>it marginally better, but nothing spectacular. >> >>I've just run a 200-game match between my standard version and an R=2 version. >>This test has 100 starting positions and the two versions plays white and black >>sides of each position. The result was: >> >> standard 101.5 nullR=2 99.5 > >That's 201, but either way it would have been hard to come up with results that >would differentiate between them less, but I'm sure you know that. > Oops. Yes it was 100.5 - 99.5 As you say, no discernible difference. >> >>The games were 2 1 with no pondering. Average depths (for what they're worth): >> >> standard 10.26, nullR=2 10.22 > >The Ernst paper claims a greater improvement with more depth than you could >achieve in a 2 1. There's probably a lot of endgame depth distorting these >numbers. He's talking about 12 middlegame plies. > >bruce Hmmm.. Not sure if I've got time for a decent match at that sort of TC. Cheers Andrew
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