Author: Ulrich Tuerke
Date: 04:55:51 07/31/02
Go up one level in this thread
On July 30, 2002 at 15:02:25, Tony Werten wrote: >On July 30, 2002 at 13:56:53, Thorsten Czub wrote: > >>in an old program i can set the null move margin on or off. >>what is the function doing ? any ideas or explanations from the programmers? > >I'll give it a guess. > >Normally when you do a nullmove and the score returned is > beta you get a >cutoff. The idea is that if doing nothing already gives bigger than beta, doing >something would give even more. You're probably right, Tony. This is an old idea, which had been already suggested by the nullmove "inventers" Goetsch and Campbell themselves a long time ago. I have played around with it several years ago. I came to the conclusion that it's not worthwhile trying it (microscopically smaller search tree but nevertheless a certain risk involved to damage the search). Uli > >You can go one step further with this idea. Since doing something would be >better than doing nothing, then doing nothing doesn't have to be > beta but only >> beta - margin since I expect that a move is worth at least "margin" > >Tony > >> >>what are the effects ? >> >>thank you. >> >>Thorsten Czub.
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