Author: Robert Hyatt
Date: 09:09:17 08/14/00
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On August 14, 2000 at 09:33:00, Ed Schröder wrote: >On August 14, 2000 at 09:10:03, Robert Hyatt wrote: > >>On August 14, 2000 at 08:54:20, Robert Hyatt wrote: >> >>> >>>I believe mine is 1.5. for Crafty, 1.25 wasn't quite enough. And I agree, >>>I did it in Cray Blitz, I did it in Crafty. It is nice to not have to watch >>>and worry about that happening (of course, there is plenty else to go wrong.) >>> >>>:) >>> >>>Bob >>> >>> >> >> >>I was wrong, it is 1.75. I changed to this about 2 years ago if my notes >>are right. > >Hmmm... maybe I have to increase too. Difficult case. But to be sure, the >1.75 is without the captured pawn itself? Meaning to say Crafty penalizes >Bxa7 (h7) cases with 2.75 or 1.75? > >Ed It is actually .75... as black gets -1.75 for the bishop trapped at a2, but it did win a pawn. In this position, this doesn't mean much as a deep search sees the bishop getting captured anyway and the penalty goes away. So in effect, this is a -3/4 pawn penalty. IE with material even, if you do this: set up the position (with crafty) and type score, you get +.85 as the eval. After Bxa2, the static score is -.10 (it sees that b3 is playable in the eval, so it treats the position with b3 played and with pawns on b2.c3 as the same... Bob
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