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Subject: Re: History Heuristic

Author: Sune Fischer

Date: 14:52:05 03/16/04

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On March 16, 2004 at 16:21:23, Robert Hyatt wrote:

>  The idea is that a move that is good at ply 15 might also be good at ply 3...
>
>And vice-versa...

However, local beats global in my tests :)

Just a single test position to depth 15:

no history:      329876472
global history:  208352670  (0 calibrations)
local history:   182337306  (29 calibrations)
local history:   162851239  (222 calibrations)
local history:   168449709  (648 calibrations)
local history:   212759140  (4249 calibrations)

Conclusion:
No calibration smears the table in the long run.
Very frequent calibration throws out too much information.
Optimal for this scheme seems to be somewhere in the middle.

-S.


>
>>-S.
>>>But in any case, I depend on killers for local cutoff moves, and I use history
>>>when all else has failed...



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