Mark Boon wrote:
I'm not so knowledgeable about the ELO system and had a few questions
about how it's used by the CGOS server.
Firstly, on the CGOS server page there's an explanation of how it
works with a table of expected winning percentages vs. difference in
ELO ratings:
http://cgos.boardspace.net/ (towards the bottom)
This table is rather different from another table I found on the
GoBase page about the ELO rating system:
http://gobase.org/studying/articles/elo/
Is there a reason why they are so different?
CGOS probably uses the usual logistic formula:
http://en.wikipedia.org/wiki/Elo_rating_system#Mathematical_details
Arpad Elo, in his book, used the cumulative distribution of a Gaussian
instead. It has a similar shape, but it is different. FIDE numbers are
based on that older Gaussian formula.
Rémi
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