Author: Robert Sherman
Date: 21:22:45 11/11/97
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On November 11, 1997 at 09:29:35, Robert Hyatt wrote: >On November 10, 1997 at 22:01:54, Robert Sherman wrote: >>> >>I am impressed that Crafty steers itself out of trouble. But a >>seven-point swing for a computer program based on positional safety of >>the king is incredible. It certainly makes that Deep Blue Be4 move >>totally normal because computer programs were only a point or two >>different. Your score is 7-8 points different from all the commercial >>programs that I have seen. > >I am re-running this and will post the results soon. A couple of >points, >however... > >1. I do *not* have king-safety terms that cause a +/- 7 pawn swing. :) > >2. I might have posted bogus analysis. I get hung up with position >learning >about once per month. While annotating, position learning is disabled, >but I >played around with this game before doing the annotate, and it is highly >likely >that Crafty "learned" something along the way that screwed the scores up >at >this point in the game. > >I will post a new annotated game in a few mins to see how it looks after >the >position.bin file has been deleted from my notebook... I look forward to seeing your new analysis. Regarding your first point, I thought so, I have never looked at your code thoroughly, but what I saw of it didn't seem to show any kingside safety heuristics that would produce such a result. So, I guess it will have to be related to your learning function. Still I am impressed with the "amateur" Crafty sidestepping an aggressive but unsound attack. I think the proper candidate moves in this position are f5, f 6 and d6, but o-o survives with the computer's nerves of steel. I am sure your analysis will show that. Robert Sherman
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