Author: Will Singleton
Date: 11:22:29 10/06/99
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On October 05, 1999 at 21:04:40, Peter Kappler wrote: >On October 05, 1999 at 16:36:59, William Bryant wrote: > >>When updating the history for a move that has generated a cutoff, >>what value to people use. >> >>Do you use ply or some function of ply which means that the closer you are to >>the leaves, the greater the value being used for updating? >>ie: History[from][to] += ply; >> >>Do you use depth or some function of depth which means the closer you are to the >>root, the greater the value being used for updating? >>ie: History[from][to] += ply; >> >>Or are there other values being used. >> >>Thank you in advance. >> >>William >>wbryant@ix.netcom.com > > >Hi William, > >I think moves that cause a cutoff near the root should get a higher bonus, as >they have been searched more deeply. In Grok, I increment the history score by >2^depth, which greatly favors moves that cause cutoffs near the root. I think I >got the exponential scoring idea from an ICCA article, but I can't recall the >author. > >--Pete Jonathan Schaeffer, ICCAJ Aug 1983, pp 16-19. There have been other articles since then, which expand on this and compare the effect of HH with other move-ordering techniques. I can't find the particular one I'm thinking of. Will
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