Author: Fernando Villegas
Date: 10:52:10 10/01/99
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Hi peter: Perhaps we can tweak a little bit your argument: at low depth range of the search, one extra ply is not better because gives room to more evaluation, but because let the program avoid significant, blunt tactical threats. As much knowledge programs -really knowledge one, not just slow programs- look less and so are more prone to tactical shortcomings, any extra ply they get from faster hardware makes more diference than for a fast searcher, which, anyway, is already in the region of, say, 14 to 18 plys, where extra plys are only marginally useful. But of course this is probably a case of limits -if I do not remember badly my maths- , where things behaviour change dramatically after surpassing certain values of the variable. Probably one or two more plys are only marginally better in the region of 15 to 18, but maybe that is not the case if by chance you get 4 or 6 extra plys. Or more... I tend to believe in the old theory that beyond certain limit tactics tend to fuse with the so called "strategie" . The reason, I suppose, is that what we call strategie is not more than thumbs rules we use because we do not have specific calculations of what is going on after some parctical reachable search. Extreme example: if you see a mate at 35 plys following certain compulsory line, you does not need evaluate moves according to positional more or less vague criteria. Cheers Frnando
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