Author: Dan Newman
Date: 11:40:53 10/16/99
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On October 16, 1999 at 04:40:54, Ratko V Tomic wrote: >> The equation should be B=exp(ln(N)/D), which will likely give you >> values closer to 3. > >Thanks for correction. That is what I used to get B=4.5-4.7, but mistyped it in >the message, since I was also caluclating what depth it would reach in a fixed >time, assuming B=3 that Bob gave and N given as number of seconds times typical >Crafty's nps rate (which is 200kN/s on my machine). The formula for that was >D=ln(N)/ln(B) [that's what I mistyped earlier, with D and B interchanged]. After >that gave me depths which didn't ring true, I went and measured exact N for >fixed D (10, 11 and 12 plies) and obtained those figures for B (using the >formula yiou gave). I thought that might be the case after I did this calculation on my own program's results and got 5.1--I thought I'd introduced a bug or something at first. Then I decided it was blowing up due to excessive extensions. Anyway, that calculation was on a tactical possition which (elsewhere in this thread) Bob says will give larger nunbers. I know I've measured my program doing BF's of 3 or so, but on most of the test positions I've just tried I get about 4.6... Fine #70, however, gives me a BF of 1.78 by the 20 ply search, but that's due to the transposition table. -Dan.
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