Author: Robert Hyatt
Date: 11:22:53 11/11/03
Go up one level in this thread
On November 11, 2003 at 13:31:21, Peter Kappler wrote: >On November 11, 2003 at 11:25:59, Robert Hyatt wrote: > >>On November 11, 2003 at 11:09:40, José Carlos wrote: >> >>>On November 11, 2003 at 10:52:20, Robert Hyatt wrote: >>> >>>>On November 11, 2003 at 10:42:10, José Carlos wrote: >>>> >>>>> So far, when I cutoff due to null move, I do BetaCutoffs++ but not >>>>>BetaCutoffsAtFirst++ so my 100 * BCAF / BC statistic gets lowered. Is there an >>>>>standard for this for I can compare with other people numbers? Should I count a >>>>>null move cutoff as a beta cutoff at first? Should I not do BetaCutoffs++? >>>>> >>>>> José C. >>>> >>>>Don't do anything in that case. You only care about the ratio of >>>>[cutoffs on first move] : [cutoffs on any but first move]. >>>> >>>>The higher that ratio the better. >>> >>> So you mean not to count null move cutoffs as cutoffs at all, right? >>> >>> José C. >> >> >>Right. or you might count null-move searches done, and null-move searches >>that failed high, if you want to know how effective null-move search is. But >>it is clearly independent of the idea of base move ordering where the first move >>should cause a cutoff if one is going to happen. > >This first-move-beta-cutoff metric is something that has always bothered me. In >previous discussions, people have reported an average of ~90%. For my program, >it's more like 80%, and I'd like to understand why. I don't use a SEE to >eliminate bad captures, and also don't use internal iterative deepening. >Perhaps that's enough to explain the difference? Very possibly. SEE makes sure you look at the "right" capture first each time a capture is the best move. Without SEE, you might have to try a couple before you find the good one. Breaking your fail-high-on-first-move count. > >If either of you have time to run a quick test with one or both of these >features disabled in your program, I'd be interested to hear how it affects the >FMBC %. > >-Peter
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.