Author: Komputer Korner
Date: 21:21:29 05/13/05
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On May 12, 2005 at 22:56:06, Steve Maughan wrote: >Mr Korner, > >I do not own Bookup but I think you may possibly be being a little unfair on the >feature of Backsolving. As far as I know the backsolving feature does a >Mini-max resolution of the position i.e. as refutation are found they are backed >up the tree using mini-max. This would seem to have some value - and it's not >simply giving a parent node the score of some deep child note - which is what >you imply. > >Regards - and welcome back! > >Steve see my additional explanation in another reply to this thread. An additional comment is that you use the word refutation. refutation means a novelty that puts a lineout of business immediately. immediately means the next move or else a forcing line whereby there are no other playable choices. how can a move at move 30 be a refutation of a move at move 12? If it was a refutation, then that would mean that there wasn't any possibility of any novelty happening between those move numbers. Even in the unlikely event of that happening, what that means is that move 12 needs an evaluation. So you manually put in the corrected evaluation at move 12. Why do you need to add useless evaluations at move 13,14, 15, etc if you already have the evaluation at move 12? But, if you know that the moves between 12 and 30 will probably have future novelties, then why would you spend time waiting for backsolving to do its work when you already have the evaluation at move 12? You would just have to backsolve all over again. If both white players and black players are willing to play the line,obviously the evaluation at move 12 has to be less than .2 of pawn advantage for white or in laymen terms unclear,or +/=/=. Thus refutation or not backsolving just adds useless bytes to the tree. What you need in a repertoire is exhaustive analysis at thebeginning of the tree, NOT in the roots. Exhaustive analysis in the roots is only good for endgame tablebases that are working from the root up. Opening theory is from the top down. Backsolving is trying to do the impossible.
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