Author: Steffen Jakob
Date: 05:47:20 02/19/99
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Hi Werner! On February 18, 1999 at 18:01:43, Inmann Werner wrote: >Hello! > >After looking at the results of the other programs and mine, I got really >disturbed. After ply 8, my program calculated 2.454.000 positions, and the >others do around 700.000! >I checked my extensions and put out my check extension, and suddenly my program >only needed around 600.000 nodes. >I think, i do something very very wrong! >I extend on any check that comes when there is only 2 or less distance till >quiet search. This seems to blow up the tree extensively. I do this extension >up to 5 times within one search, so sometimes in a 8 ply search , I search to >ply 13. >So my question is. >When should I extend on check? You have to make sure that you don't use extensions which are > 1 ply. Otherwise your tree will explode. Another thing which is useful is to reduce the extensions when you are searching very deep (e.g. if(ply > 2*root_depth) extension >>= 1). Greetings, Steffen.
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