Author: blass uri
Date: 12:32:58 07/22/00
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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 I apologize if I used the wrong name but I know some top programs when there is no behaviour of change in the score after trading queens (with the only exception of change in the score because of deeper search) My experience with Junior(not Junior6 but I have no reason to believe that Junior6 is different) and with Hiarcs or Crafty tells me that they do not change their score after the expected move(I am not talking about a change in the score because of deeper search). I also do not remember significant change in the score in chessmaster after the expected move Uri
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