Author: Robert Hyatt
Date: 08:28:10 10/29/02
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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? The scores in crafty can be +/-5.00, on positional stuff. On things like unstoppable passed pawns the scores can be far higher... >- Could you share some experiences about your margin and its >advances/disadvances? You have to use chess judgement in making those decisions. IE as your program plays games, you will reach positions where you might think "no way I would try to save that pawn because it wrecks my position here and here." Your eval then needs to have scores large enough for those flaws you found so that they outweigh the value of the pawn you might try to save. Ditto for exchange sacrifices. And so forth > >Many thanks for any answers. >+PHN
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