Author: Robert Hyatt
Date: 05:29:50 10/13/99
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On October 13, 1999 at 02:33:43, Dave Gomboc wrote: >On October 13, 1999 at 01:21:27, Robert Hyatt wrote: > >>Hsu's will be a great read. I proof-read it for him, and as my wife will tell >>you, I read it front-to-back without putting it down. Very interesting reading >>for all, when it comes out. >> >>BTW I agree about all the DB guys. I have known Murray almost forever, and >>could tell you how I became the first ever programmer to use PVS, albeit >>accidentally at an ACM event, at his urging. And I've known Hsu since 1988. >>I wouldn't call any of them 'close friends' but I definitely respect what they >>have done. > >Okay, let's hear the story. ;-) > >... and how does the book stack up vs. One Jump Ahead: Challenging Human >Supremacy in Checkers? (not to put you on the spot or anything <grin> :-) > >Dave The story goes like this. At an ACM event, Murray and I were talking during a game, and we were discussing the idea that later came to be called PVS (that of doing a null-window search everywhere but down the precise PV). I told him that the current version of 'blitz' would be easy to modify. We were running on some machine besides the machine I did the development on, and we logged in and made the changes. It was faster, for sure, but produced a lot of fail-highs at the root. We fiddled with it, decided it needed some more testing, and went to bed (these changes were made on our 'backup' machine remember. The next night, about 3/4 of the way thru the game, our primary machine went down, and we switched to our normal (backup) machine. And started getting fail highs all over the place. I thought we were winning at first, but discovered our score went from +.311 to +.315 or some such nonsense, before I remembered the test Murray and I were trying the night before. After the tournament, I switched to PVS and never looked back. As far as Hsu's book, it is in the same sort of style as the checkers book, but gives insight into a lot of the development history, in particular how close they 'cut it' getting ready for each of the Kasparov matches. :)
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