Author: Robert Hyatt
Date: 17:12:47 03/04/06
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On March 04, 2006 at 18:26:47, Chan Rasjid wrote: >This is for an earlier thread somewhere. > >It may be piece12-to may be better than from-to for history stuff. > >A side may attempt to retain a certain board configuration or a part if it >strong >especially near the palace. Then such spaces may be good or bad for certain >piece-type-color and the from sqaure has no relevance, only the type and color. > >Also in endgame, the significant pieces are pawns and kings and the above >analysis >may also apply. > >The above non-random goodness or badness of squares towards type-color will give >the history value a bias towards fh/fl and it is this non-random bias that makes >history useful. > >Rasjid I tried both and could not get piece-to to out-perform to-from. They were close, but to-from was always just a bit faster for me. I ran several test suites, including ecmgcp for testing, plus some non-tactical positions to make sure they didn't behave differently... This probably varies by engine, no doubt...
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