Author: Robert Hyatt
Date: 15:19:09 08/30/01
Go up one level in this thread
On August 30, 2001 at 17:56:58, Alvaro Jose Povoa Cardoso wrote: >On August 30, 2001 at 17:30:22, Robert Hyatt wrote: > >>On August 30, 2001 at 16:41:27, Alvaro Jose Povoa Cardoso wrote: >> >>>Should we extend a PV move? If so, by how much? 1/4th of a ply, 1/3rd of a ply? >>>From my experiments it only helps in some positions and only detects mate >>>sooner, but "allways" with a tree size increase. >>>As a side question, how do I identify a PV move? >>>Using PVS I assume a PV move is when alpha <> beta-1. >>>Am I right? >>> >>>Thank you in advance, >>>Alvaro Cardoso >> >> >>Probably better is to save the original alpha/beta values at the root, >>and compare to those. If current alpha = root alpha, and current beta = >>root beta, you are definitely on a PV move search. > >That's what you do in Crafty in the 'Internal Iterative Deepening' part, isn't >it? Yes... that is the only place I allow IID to "trigger". >And about the extension of a PV move, have you ever tested it? >What is you opinion on this? I played with it a few years ago. I didn't like it. As I don't see any justification for searching the PV slightly deeper than the other moves at the root... > >Regards, >Alvaro Cardoso
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