Author: Robert Hyatt
Date: 21:08:48 05/13/98
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On May 13, 1998 at 20:15:31, Don Dailey wrote: >On May 13, 1998 at 17:57:10, Bruce Moreland wrote: > >> >>On May 13, 1998 at 16:20:50, Don Dailey wrote: >> >>>From a pure software standpoint, is Crafty a better program than Blitz? >>>Please don't consider the engineering factors like cray assembler or >>>special highly hardware dependent things. >> >>I've been watching Bob's brain during the development of Crafty. He's >>learned so much that it has to be better. >> >>He's gotten like 50,000 games with Crafty, plus the help of a bunch of >>people who will point out mistakes. >> >>But I'll let him answer now, if he likes. >> >>bruce > > >I'm assuming it's stronger too, but I want to hear his analysis. For >instance I think Cray Blitz was full width but I'm not sure. I don't >think he could spend as much time with Blitz either but I'm not sure >about this either. > >- Don CB had three "pieces" of search: (1) full width to 10 plies; (2) selective stuff for 4-6 more plies; (3) quiescence search with checks, captures, out-of-check to detect mate, etc. Crafty has full-width to 12 plies, plus a capture-only quiescence search. So they are different... but similar. I used the same things like out of check extension, recapture, pawn push and one-legal-move, plus singular extensions that are not currently in crafty but which might show up real soon. CB's main fault was lack of test time. Of course, making the many friends I have on ICC has helped, Roman in particular... he is currently working on beating against crafty trying yermo's favorite openings to see how it will respond. I hardly ever got GM advice before... now I have about all I can stand. :) And never underestimate the advantage of playing 20-30 GM games per day, 7 days a week, 365 days per year... That is a *huge* plus for those of us that can do this...
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