(Dr. David Kirkby) wrote in message . com...
I recently played someone on ICC and beat them, much to my delight, as
they were a lot stronger than me. I wanted to know what their rating
was before they played me, but could find no way of determining this.
I knew their rating after the game was 1682 and mine 1334, since
that's in the PGN file.

I've written a small program that computes this data. Given the
ratings AFTER a game finished (what's recorded in the PGN file), and
the result, the program can compute the ICC ratings of both yourself
and your opponent BEFORE the game started. (It only works for
established players, not those with provisional ratings. It only works
on ICC. I doubt FICS or anywhere else uses the exact same formula as
ICC).

snip

Someone has kindly produced a Windoze executable, so now the zipfile
contains the C source, the executable and a README file (sorry,
there's .txt extension on the README, but open it in notpad or similar
on a Windoze machine).

http://www.g8wrb.org/chess/iccratings.zip

A faster algorithm has been suggeested. I will investigate this, but
for now at least neither the source code or executable use this faster
algorithm. If it does work, I will update the source code. Whether or
not the exe gets updated is up to others, as I can't create a
executable for windows myself.


david
dot
kirkby // note the two k's in kirkby
at
onetel
dot
net

Dr. David Kirkby.