Author: Robert Hyatt
Date: 18:30:58 02/04/01
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On February 04, 2001 at 12:00:23, Miguel A. Ballicora wrote: >On February 04, 2001 at 10:46:32, Robert Hyatt wrote: > >>On February 04, 2001 at 04:50:34, Alvaro Jose Povoa Cardoso wrote: > >[deleted] > >>>If I'm not mistaken you said _internal_iterative_deepening_ can be used to fill >>>the PV below this point. Can you explain the details, you see I'm a novice on >>>this things. >>> >>>Alvaro Cardoso >>> >>> >> >> >>I don't use it to fill in the PV. But if I reach a node where I am trying to >>find a PV (using PVS I detect this where beta != alpha+1 in the search) and I >>don't have a hash-table move to search, I do a short iterated search to find the >>best move so that I can try it first and not have horrible move ordering. >> >>All I do is say "(1) is this a PV node (beta != alpha+1) and (2) do I not have >>a hash move to search here?" If the answer to both is yes, I simply call >>search with the same position and ply, but depth-2. However, _that_ search >>will have the same problem so it too will again call search with depth-2-2, >>and so forth... > >I am curious, would depth-1 take much time? > >Miguel I tried 3 cases... depth-1, -2 and -3. -2 seemed to produce the best results back when I tested it. -1 was ok, just slower.
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