Author: Robert Hyatt
Date: 14:20:11 07/20/98
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On July 16, 1998 at 04:33:06, Amir Ban wrote: >On July 15, 1998 at 16:50:09, Robert Hyatt wrote: > >>On July 15, 1998 at 11:03:10, Danniel Corbit wrote: >> > >>I agree with you 100%. However, if you look at the Fredkin prize award >>information, DT was clearly playing "at GM strength, based on a >2550 >>rating for 25 consecutive games, computed using normal rating procedures." >> >>But, as you pointed out, it wasn't a "GM" in the FIDE list. It might well >>have been one in the USCF listing, there I don't know. There are multiple >>federations that award GM titles of course... Only FIDE awards the IGM >>title. > >Playing 25 games at performance of 2550 doesn't get you a 2550 rating. If you >started out at 2400, for example, you will advance to only about 2450. > >Amir I believe that I gave one wrong impression and one wrong piece of data, based on re-reading some old literature I have here. 1. The Fredkin prize required a >2500 performance rating over 25 consecutive games. 2. Deep Thought produced a performance rating over 2650 for 25 consecutive games. The rating was, (if my old email from Hans was/is still valid) computed as the usual sum(wins+400, draws, losses-400)/N.. Which means that you had to produce a performance rating of 2500+ and *maintain* it for 25 games so that you couldn't have a short "spike" and get over the hump easily. But it was a performance rating, which means it was only applied to any 25 consecutive games they played. I had overlooked the >2650 rating they produced however (this was deep thought 2 IIRC) which was far slower than DB or DB-2. But >2650 is still quite an accomplishment... regardless of how you look at it... and it couldn't be blamed on "computer shock" either as there were plenty of games circulating around for opponents to study.
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