Author: Bas Hamstra
Date: 06:06:46 02/02/03
There are some succes stories about replacing nullmove with FH reductions. In fact what Ed Schroeder does is the same thing, in my opinion. I am interested in other experiences with this technique. So far I find it disappointing. The idea is to reduce the search whenever in the FW search the color to move's static evaluation (minus a static threat evaluation) is already above beta without having moved. Suppose you combine this with nullmove, and you do a nullmove first. If the nulmove fails high, you obviously won't profit from FHR. If the nullmove fails low, what on earth would you reduce the search for??? It can only be wrong... So to really profit from it, you would have to do FHR first. So if static-threat > beta, you would reduce the search one ply before doing the regular nullmove code. A couple of thoughts: in stead of static eval minus static threat, you might as well do a nullmove+qsearch, I would say. However neither will be really accurate and you end up using R=4 where you really shouldn't. Any thought on this? Best regards, Bas.
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