Author: Peter Kappler
Date: 22:45:37 12/19/01
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On December 19, 2001 at 14:18:21, James Swafford wrote: > >I'm just now getting around to implementing a null move search in >the dinky little thing I've been playing around with lately. > >One of the move ordering stats I keep track of is the ratio of >fail highs on the first mv vs. the number of total fail highs. >Previously this number has been at 87% for the first 100 problems >of the Win at Chess suite. (My eval is so simple I don't bother >testing more than that yet. :) ) > >With a pretty kludgy null search with R=2, I'm getting a few more >problems right, and searching a little deeper on average. An >observation I made, though, is that the ratio mentioned above fell >to 78% - a delta of 9%. > >At first glance that makes sense to me, though I'll have to think >about it a little more later. It leads me to wonder, though, >if this is consistent with more sophisticated engines. > >For those out there that keep track of that ratio, have you measured >it without a null search? I'd be interested in hearing the numbers >with and without the null search, just to be sure I didn't break >something. > Hi James, Here are Grok's numbers (full-width search only, not quiescence): null move, futility pruning: 77% null move, NO futility pruning: 82% NO null move, NO futility pruning: 85% I guess I need to do some work on my move ordering. -Peter
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