Author: Tord Romstad
Date: 09:30:33 05/26/04
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On May 26, 2004 at 12:13:03, Robert Hyatt wrote: >On May 26, 2004 at 10:53:16, Stefano Gemma wrote: > >>I've used an recursive-iterative deepening. I try to explain in my poor english. >>At any N plyes i've applyed iterative deepening as for the root. Suppose to >>start with 2 plies. The next iterations you should search 4 then 6 then 8 plies >>etc, form the root. But, when you're searching 8 plies depth, and you are at a >>position located at ply 2, why don't use iterative deepening starting from ply >>2, instead to do a full search of the remaining 6 plies? So i've tried to >>consider positions at ply 2 (and 4 and 6...) as they were at the root, and start >>a search to ply 4, then 6, then 8. Sometimes works better, sometimes worse... >> >>I have tried different schemas, in Raffaela. The best seems the schema 2-4. You >>increment the iterative deepening by 2 plies (one chess move by colour) and, for >>any ply, you make an iterative deepening with increment 4. In some position, 2-2 >>was better. >> >>I've abandoned this idea, for now, because i'm working on a new engine and i've >>little time for my hobby, but i think that could be interesting. >> >>Ciao!!! >> >>Stefano Gemma > > >That sounds like an interesting idea that is worth testing. IE at _any_ ply >where you want to do a depth=N search, you iterate and do a depth=1, 2, ..., N >to work your way up to that point. With luck the depth 1 to n-1 searches will >be cheap with hash information, if there is none, move ordering will probably be >broken anyway and this might improve things. This is exactly what I always thought was called "internal iterative deepening", but I have recently learned that others use this term to refer to something different. I use something similar to Stefano's technique (if I understood it correctly) at all internal nodes where the remaining depth is high (currently 5 plies or more) and I expect a fail high. Tord
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