Author: Omid David Tabibi
Date: 09:51:23 07/17/03
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On July 17, 2003 at 04:14:53, Joachim Rang wrote: >I have an idea for another form of reductions and/or pruning. > >If a move sacrifices a piece for nothing or not more than a pawn reduce depth if >the following criteria are met: > >1. Your own king safety and mobility doesn't improve and the king safety and >mobility of the opponent doesn't get worse. > >2. You don't get a passed pawn and you don't remove a passed pawn of your >opponent. > >The idea is to distinguish between good (promising) and bad (stupid) sacrifices. >The assumption is that a good sacrifice does either change king safety or >mobility to your favor or does create or remove a passed pawn. > >One can consider to make a complete cutoff of this subtree, if these criteria >are met even after another two or four plies. > >To implement such a thing you need of course a good and detailed king safety and >mobility evaluation. > >What do you think of this idea? > >Is this already implemented in certain engines? Takes a look at Ed Schroder's description of Rebel's selective search: http://members.home.nl/matador/chess840.htm >Is this a bad idea because it is too dangerous? >Is this unpracticable because too complicated to program or too much calculation >is needed to do this? > >If you think that it is too dangerous please post some positions in which such a >reduction/cut-off could fail. > >Note: Sacrifices which either change king safety or mobility to your favor or >give you a passed pawn or remove a passed pawn from your opponent are not >reduced. Are there good sacrifices which improve your position in other >criteria? > >regards Joachim
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