Author: Andrew Dados
Date: 11:16:51 07/22/00
Go up one level in this thread
On July 22, 2000 at 14:11:20, Ed Schröder wrote: >On July 22, 2000 at 13:28:28, blass uri wrote: > >>Deeper blue had a positive evaluation before trading queens. >> >>The evaluation of Deeper blue was based on Deeper blue's logfile >> >>9(6) 3 T=46 34...Qxf1 >>10(6) 2 T=130 34...Qxf1 >>11(6) 2 T=168 34...Qxf1 >> >>The evaluation when deeper blue started to ponder (hash guess Rxf1) was >> >>7 (4) -30 >>7 (6) -66 >>8 (6) -50 >>9 (6) -50 >>10 (6) -50 >>11 (6) -48 >> >>Deeper blue lost 0.5 pawn in the evaluation and the only reason that I can >>explain it is that it is a root processor. >> >>I guess that something like this cannot happen to Deep Junior because it is >>probably more knowledge based program. >> >>Uri > >The behavior you describe is quite normal. After a queen exchange in the >next move often other more accurate tables are used which may cause such >score differences. I do the same in Rebel. That doesn't make the program >a root processor. A root processor is a program that totally (or to a >great extend) relies on the evaluation on the root. If you read the IBM >pages it is said DB has something similar (a short investigation at the >root). That makes DB no root processor. > >Ed What you just said is pretty much confirmation of preprocessing to me: 'After a queen exchange in the next move often other more accurate tables are used []'... If it is done in the search - then no score differences should be seen; if it is done at root then it is clear preprocessing... -Andrew-
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