Author: Uri Blass
Date: 06:35:11 02/12/04
Go up one level in this thread
On February 12, 2004 at 08:24:23, Daniel Clausen wrote: >On February 12, 2004 at 06:42:47, Uri Blass wrote: > >>On February 12, 2004 at 06:16:53, Daniel Clausen wrote: >> >>>On February 12, 2004 at 06:03:37, Uri Blass wrote: >>> >>>[snip] >>> >>>>The main point is that programs should not evaluate unclear position as winning. >>>> >>>>Black has a big advantage without capturing the pawn so there is no reason to >>>>capture h3 and get unclear pawn endgame. >>>> >>>>evaluating Rxh3 Rh2 as a win for white without search is a msitake but >>>>evaluating it as a win for black is also a mistake that cause Crafty to miss a >>>>simple win by not capturing the pawn. >>> >>>And again I'm reminded of the posts some months ago, in which someone suggested >>>to have some kind of an uncertainty-value together with a score. In this case, >>>the machine could decide that it's better to play a move with score +1 (5% >>>uncertainty) than a move with score +2 (70% uncertainty). >> >>No >> >>score should consider the uncertianty inside of it. >>The score is in pawns but can be also translated to an expected result. >> >>Uri > >You claim "my" suggestion doesn't work w/o really proving anything. Just because >everyone isn't doing it that way doesn't mean the idea doesn't have any merit. I >think the idea is worth it _for me_ to investigate and will do so in my engine. >I'm aware it doesn't fit in the current minimax principle that well, but that >doesn't mean it's useless either. (whether the implementation is (score, >uncertainty%) or something else is another thing) > >Btw: "score should consider the uncertainty inside of it" doesn't make a whole >lot of sense to me. When I say in statistics that the value is in the interval >[a, b] with a certainty of 95%, I also can't put this 95% in the interval - or I >end up with [-inf, +inf]. > >Sargon Score is about expected result. You need to compare between leaves. If you say +1 is better than +2 then the +1 and +2 are not final scores of the leaves and only numbers that help to compute the final scores. Uri
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