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Subject: time handicap and ratings

Author: Kerry McDermott

Date: 08:01:54 01/09/99




In the early 90's I was receiving Computer Chess Reports and the conventional
wisdom then was that halving the time that a computer calculates would be
equivalent to halving the processor speed and that would mean a reduction of 75
rating points.  Is that still accepted?  I talked to some sales folks at ICD and
they were indicating that 100 rating pts. was the current standard estimate.
How is this question altered if the computer does not think on opponent's time?
Early 90's wisdom indicated that would decrease a program's strength by 25 pts.
Also still true?

Also, I have a variety of Mac chess programs including all Macchess versions as
well
as ChessMaster 300 and 4000.  I am running a Mac with a 603e 100Mhz.  I would
like to know the approximate ratings of any of these programs particularly at
G/30.  I would like to time handicap the programs so that I can play against an
opponent in the 1900-2000 USCF range so that I don't get thrashed all the time
and can train for tournaments.  I'm pretty convinced about the 75 rating point
reduction for halving the computer's time.  The question, of course, is how many
times should I divide the time?
 Any information on any of these questions would be greatly appreciated.

Thanx

Kerry



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