Author: Dezhi Zhao
Date: 09:15:05 03/02/06
Go up one level in this thread
On March 02, 2006 at 11:43:20, Robert Hyatt wrote: >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... > you may use [ply][piece][to], 64*12*64 = 48K entries. and only the very first quarter of the table is really active most of the time. So, this looks not that bad. >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... > Yes. I understand history table is in fact a set of global killers. However, [ply][piece][to] or [ply][from][to] obviously dominate your original [side][from][to]. If you still need the globalness, just add all the history values of a move from odd plys and even plys respectively. > >> >>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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