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Subject: Re: Cray Blitz - Ratings of the past false? Or are Current ones false ??

Author: Robert Hyatt

Date: 21:15:54 07/26/99

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On July 26, 1999 at 19:23:01, John Wentworth wrote:

>After Cray Blitz won the 1983 World Computer Chess championship it's rating was
>2153. The Cray supercomputer from that time is still much faster than today's
>PC's ever dreamed of being yet Cray Blitz's rating was much lower than todays PC


In 1983, only _three_ programs were actively playing human chess.  Cray Blitz
had a USCF rating of 2250 or so, belle was 2208 and Nuchess was about 2000 or
so.

Forget that 2153 rating... that was a TPR for that tournament with no estimates
for most of the programs playing...  CB drew one game with nuchess in that 5-
round event...  it won the rest including defeating Belle in the final round
to win the tournament.

And in 1983 a micro was doing good to be 1800.  Todays crays are far faster.
In 1983 we were doing 20K nodes per second...  last time I ran on a T90 it
was doing 7M nodes per second roughly...


>programs. In another post here, Robert Hyatt mentioned that Cray Blitz would
>beat Crafty based on hardware. So I guess my conclusion here is that either the
>rating of 2153 back in 1983 for Cray Blitz was way off or the estimated rating
>of Crafty and other current PC's are way off. In my opinion, Cray Blitz running
>on a Cray Supercomputer would still blow away any of the current programs
>running on any PC today. I guess I have to think that the rating of 2153 was WAY
>off. Any other opinions?



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