Author: Vincent Diepeveen
Date: 08:32:08 12/30/02
Go up one level in this thread
On December 29, 2002 at 19:35:52, Martin Giepmans wrote: If you use nullmove don't use any of the reduction-2 stuff. Ed isn't using nullmove. It is very dangerous to use. I also concluded the red1 doesn't work too well for me. I get 1-5% speedup out of it. It basically only reduces the tree after for example from opening e4 h5 qxh5 rxh5 d4 <reduction-1> <nullmove> (some moves and cutoff) So my nullmove reduction factor becomes from R=3 to R=4 in such a case. If i want to use R=4 i'll let my program know it by myself, so i turned off reduction-1 for now. It's a feature however in diep people can turn on when they want to. >On December 29, 2002 at 19:05:51, Tony Werten wrote: > >>http://members.home.nl/matador/chess840.htm >> >>Tony > >The formula for reductions 2b and 2c look strange: >"alpha < score + threat + margin --> reduce depth ..." > >This would imply that a bigger threat gives more reductions ... >Should be score - threat - margin? > >Martin
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