Author: blass uri
Date: 12:42:30 07/22/00
Go up one level in this thread
On July 22, 2000 at 15:32:26, Ed Schröder wrote: >On July 22, 2000 at 14:16:51, Andrew Dados wrote: > >>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- > >Yes such ticks are preprocessing. And it helps. But note that in Rebel >only a few things are done this way not more than being < 0.5% of the >total knowledge. That makes Rebel not a root processor and DB neither >which was my reply to header of the subject. > >Ed I guess that I should use the words:Deep blue does some preprocessing These are important news because the claim was that Deeper blue has more knowledge than other programs and if Deeper blue does not know some things that part of the other programs know(for example not to do preprocessing) then it proves that Deeper blue's evaluation was not so good like Hyatt believed. They could do everything they wanted in hardware about the evaluation is wrong because they could not avoid some preprocessing. Uri Uri
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