Author: Pham Hong Nguyen
Date: 21:30:28 10/28/02
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On October 28, 2002 at 23:10:31, Russell Reagan wrote: >On October 28, 2002 at 20:28:43, Pham Hong Nguyen wrote: > >>Hi all, >> >>I read that someone suggests the margin between the evaluations and materials >>should not excess 1.5 of pawn. However, my margin is 1.5 of ... queen and I >>think that causes many problems for my program: difficult to apply razoring, >>lazy eval, cut off in qsearch... >> >>So my questions here are: >>- What is the margin of Crafty? >>- Could you share some experiences about your margin and its >>advances/disadvances? >> >>Many thanks for any answers. >>+PHN > >You can't set a static margin. If MATE is 32768 (or whatever) that's not going Russell, MATE is returned by searching, not by evaluation function. I mean here the max distance between values of static evaluation and materials, or in other words: what is the max bonuses+penalties in your evaluation function? Mine = 1.5 queen, quite large, thus I feel hard to apply razoring (and some cuts off in qsearch, eval) based on materials only. >to be within the 1.5 * pawn margin, or even 1.5 * queen. Maybe for the purposes >of doing something like lazy evaluation you can use a margin, but it's not >something you can use absolutely. > >I've only heard that all non-material evaluation is only worth about 0.5 to 1.5 >pawns. Maybe that's what you're talking about. > >Russell
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