Author: Robert Hyatt
Date: 18:57:46 07/29/03
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On July 29, 2003 at 21:11:23, Mathieu Pagé wrote: >Hi, > >I have this question about iterative deepening: > >When I have search a position at, let say, 8 ply and i had searched half of the >moves at ply 9 and none of those move return a better score than the best move >at 8 ply wich move should I choose ? The best at ply 8 or the best at ply 9 even >if I have not search all moves ? > >someone have an hint ? > >Thanks for your help. > >Mathieu Pagé You have two choices. 1. If you don't get a best score at depth=N, that means that the score is going to be _lower_ than at the previous (depth=N-1) iteration if you are using an aspiration window. (if you are not, this is impossible so I assume you are). 2. After the _first_ move fails low, you can relax the alpha value and search it immediately again, rather than trying to search all the moves first. I use approach 2 at the present, although I have used approach 1 many years ago (20+).
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