Author: Steve Maughan
Date: 10:34:59 10/06/99
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Bas > >First: are you sure you don't doublecount nodes? I'm not double counting. >If you put Nodes++ on top of ab and Qnodes++ on top of qsearch, then you >doublecount the depth = 0 nodes. Because you count em in the normal search *and* >the qsearch. Therefore, before you go into the qsearch do a qnodes--. > >Counted that way qnodes should be a smal fraction of total nodes. It depends >also on the position. And according to my experience the use of nullmove worsens >that rate, because normal nodes get pruned at the cost of extra qsearches. >Without null I see qrates of 10-20% and *with* nullmove it is more like 50%. I can't see how the ratio of QNodes:NormalNodes can go below 1:1 (eg 10-20%) as each NormalNode must give rise to at least one QNode. Where am I going wrong? >In any case 5:1 is certainly not what it should be, at least not if you do a >simple qsearch without checks etc. A way to improve that rate is skipping losing >captures. Also if there are serious errors in movesorting the qrate can go way >up. I'm only doing good captures in the QSearch - hmmm, I'll have another play around Thanks anyway!! > >Regards, >Bas Hamstra.
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