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http://www.queenalice.com/game.php?id=218026
I lost the game and lost seven rating points; but my opponent only gained five. Yet the rating formulae given on the about page are symmetrical: assuming both players have established ratings, the total of their ratings should not change. Just before I resigned, my opponent was rated 223 points higher than me. So he should have gained
0.04 x (-223) + 16 = 7.08 points (not five)
and I should have gained
0.04 x 223 - 16 = -7.08 points (as happened)
Note that rounding errors cannot explain a difference of two points. It's also not the case that my rating was calculated first and then my opponents rating calculated with this new rating difference -- that would still give him 6.8 points.
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No, ratings grow slower if you are above 2100. That's one of the cases that fall under the "There are a few special cases and exceptions that are used when the ratings of the players meet certain conditions" statement. See the USChess page for more information.
Miguel
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Ok -- fair enough. Thanks for the prompt explanation!
Maybe the about page could mention that ``Ratings over 2100 change a little more slowly''? (I appreciate that the full details of this are too fiddly to bother putting on the About page.)
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Sorry to butt in, but can someone explain how you transfer from a provisional to an established rating?
Best wishes,
CTB
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Clive, by completing 25 games
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Thanks.
Oh well, that will take me quite a long time!
Never mind. 
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