Author: Chris Whittington
Date: 01:43:04 11/27/97
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On November 26, 1997 at 21:52:10, Robert Hyatt wrote: >On November 26, 1997 at 15:54:48, Tom Likens wrote: > >> >>How about "because Bob's a damn good programmer!!" :) >> >>Bob, you've gotta' love messages like this. So much more satisfying >>then >>why did Crafty X.XX lose to Mega-Chess 1E6 on such-and-such a date. >> >>To really address the question, from my perusal of Crafty's source code, >>it seems to do an excellent job of move ordering and intelligent move >>extensions. Both key components of a fast program. >> >>--Tom Likens > >while it's move ordering is not bad, it is not particularly exciting. >The >stuff I do here is the same stuff I did in Cray Blitz for many years. >That >part of the search is well-known... > >Part of the speed has been the direct result of bitmap development. >When I >started, I knew nothing about it. I made a promise to myself that I was >going >to stick with them for at *least* 3 years, to give myself a chance to >become >familiar with them, and get into the mode of "thinking bitmaps." It is >now >natural, thankfully, and they offer a lot. They *really* offer a lot >when it >comes to 64 bit architectures, because they are designed to work on such >machines efficiently... If I remember rightly, Crafty didn't get such a vast nps improvement on the alpha in Paris, certainly not as much as I'ld been expecting ..... What is Crafty nps on say a PP200, compared to an alpha 500 ? And could you factor out for us the nps change due to the architecture only ? (I know this is fraught with difficulties, but please take a shot at it). Chris Whittington > >but you are right, it is more fun talking about why it is fast, or why >it >does (or doesn't) find a particular move, rather than why it loses to or >beats program "X". IE I'd suspect someone is going to want to know how >Rebel 9 lost to Rebel 7 in this last tournament going on. The answer is >simply "stuff happens." One game is interesting, but not informative.
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