Author: Sven Reichard
Date: 11:46:41 05/04/01
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On May 04, 2001 at 09:25:21, Robert Hyatt wrote: > >I don't know where that comes from but DB was _not_ a "root processor" by >any definition of the word. The evaluation was 100% tip evaluation... that >was the purpose of the hardware in the first place.. I don't know if they changed it for the later machines, but Deep Thought fits the description of a "root processor" in the following way: The tip evaluation was basically based on piece/placement tables (actually, it is a bit more involved, in the sense that there were more tables than just one for each piece. All in all, A. Nowatzyk speaks of "nearly 40,000 programmable parameters"). These tables were loaded before each search based on (and that is the important thing here) features of the root position. This explains difficulties in evaluating transitions as described by Uri. Regards, Sven.
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