Author: Robert Hyatt
Date: 08:43:20 03/02/06
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On March 02, 2006 at 01:08:47, Dezhi Zhao wrote: >If you want to try adding another dimension to the history table, I think the >ply number is the best candidate. You just replace the side index with the ply >number. This will greatly localize the histroy table and probally make it more >useful. We can call it history killer table by doing so:) Huge table. becomes 4096 * 64 for my program. = 2^18 or 262K entries... I'll add this to my list of things to try however, although I suspect it will only be useful for the reduction test, since the point of global history counters is to emulate a sort of global killer move list... > >On March 01, 2006 at 16:05:06, Robert Hyatt wrote: > >>I am still using my old 12-bit history index <to><from> to index into these new >>values. I also still maintain one for white and one for black. I once tried a >>17 bit index <piece><to><from> but it offered no improvement to the basic >>history heuristic, but I have not tested that with this reduction stuff. >> >>Any ideas what others are doing here? I can think of several possibilities: >> >><piece><to> >> >><piece><from> >> >><to><from> (I am doing this now) >> >><piece><to><from> >> >>to name at least 4. First two seem too simplistic. Last one turns the history >>tables into pretty good sized arrays (2^17 for white, ditto for black). >> >>Note that I am essentially factoring in wtm already since I have two separate >>sets of history tables for black and white.
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