Author: Robert Hyatt
Date: 07:25:43 01/22/00
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On January 22, 2000 at 06:15:27, David Blackman wrote: >On January 21, 2000 at 15:08:16, Robert Hyatt wrote: > >>But they don't take the time to find out which pieces are attacking squares >>around the king "through" another piece. IE a bishop at b2 attacking g7, but >>only if the Nc3 moves. Or only if the pawn on d4 or e5 moves. That gets very >>expensive computationally. DB gets it for nothing. I think it would slow me >>down by a factor of 100 or more, depending on how far I wanted to take it... > >Actually, Desperado gets most of the interesting cases of this one, and it >doesn't take much time and there aren't any fancy data structures involved. >Desperado is not a particularly smart program. It's just lost three in a row >against Crafty. But NPS reported by the two programs were about the same. > >Of course, Desperado is certainly missing a lot of other factors that Deep Blue >had. Even the pawn structure code misses a lot of important stuff. > >I wonder if Diep might be a good approximation to Deep Blue done on normal PC >hardware? Vincent is probably a better chess player than anyone in the core Deep >Blue team, although he doesn't have the assistance of several GMs to help him >tune the eval. And from the vague suggestions from both camps it sounds like the >complexities of the two evals are more or less similar. Murray Campbell is a very strong chess player, with a master's rating before he stopped playing if I recall. But he definitely isn't weak or rusty, based on games I have played against him at ACM events when we are fooling around. > >From Diep's results it seems to be perhaps a bit weaker than the best PC >programs, but still very competitive. Sometimes the extra knowledge brings a >win, other times the reduced search depth brings a tactical loss. Maybe that is >how the Deep Blue program would go if rewritten for the PC. No real idea, other than it would not be "deep blue" on a PC. Maybe "shallow blue" might fit. :)
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