Author: blass uri
Date: 13:08:44 07/30/99
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On July 30, 1999 at 14:05:01, José de Jesús García Ruvalcaba wrote: > A few weeks ago somebody asked which selectivity levels were better for CM6000 >to analyze at very long time controls, suited for correspondence play. > The advice given was to use zero selectivity. I do not remember why I did not >answer at that time, but my advice is exactly the opposite: the longer the time >control the higher the selectiviyy level should be set, and not only for CM6000 >but for any program that allows you to change it. > The reason is that, due to the exponential nature of the search tree, the extra >time is almost worthless when using no selectivity or very low selectivity. >Jos It depends on the program. I know that previous version of Rebel were more selective and it cause a problem because Rebel prune some good moves with the selectivity. If you use high selectivity (do not analyze moves that you consider as illogical moves) then you can miss simple tactics because you prune some good sacrifices and do not analyze them and it may be a big problem at long time controls. Uri
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