Author: Tom King
Date: 13:41:50 08/08/01
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On August 08, 2001 at 16:33:33, Tom King 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 > >Hi Bruce, > >I'm "doing a DarkThought" with this - ie R=2 near the tips, R=3 near the root. >It made very little difference to test suites, IIRC, but didn't seem to make >things worse. > >I've been using the mixture of R=2 and R=3 for two years. I made the change just >after the WCCC at Paderborn, after a discussion with Bob on this forum. > >Looking back at my notes, the R=2/3 mix improved times on on 18 of the BT2450 >problems, and gave worse times on 6. For LCT-2, the R=2/3 mix improved times on >14 of the problems, and worsened times on 4 of the problems. The improvements >were pretty small, and this is a small sample. Self play showed no improvements >in strength, but I liked the extra bit of depth, so I kept it. > >So back then it was a slight win, at least for Francesca. However, since loading >up the eval with wacky stuff to create the M.A.D versions of Francesca, I >haven't revisited the R=2 vs R=3 stuff. Probably should do - if I had time! > >I suspect there are some other tricks to be found, which relate to this. Many >commercial programs seems to search through the plies at an extraordinary speed, >these days. And of course, they wallop poor Francesca, who has never been too >hot with tactics! > >** Good luck at the upcoming WMCCC. When is the date for it? ** > >Rgds, >Tom I'll try and R=2 vs R=2/3 match (probably blitz), and see what happens. Results will appear here. Actually, at blitz, my money is on R=2, but we'll see. Rgds, Tom
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