Originally posted by kriscuypers
Last week i won a game against someone with +/- 1100 points.
My rating was 1363. Nevertheless i won that game i lost 3 points;
my rating is now 1360 points.
Is that possible?
Thanks to answer this question
Yes, if your provisional rating is 200 points or more higher than another provisional player, your rating will go down a little when you win (and a lot if you lose!)
The easiest way to work out what will happen to your provisional rating when you complete a game is as follows:
Subtract your rating from their rating (in your example, 1363 - 1112 = -251)
Add 200 if you win against someone with a provisional rating, 400 if they have a normal rating;
subtract the same amounts if you lose; leave the number alone for a draw (in your example, -263 + 200 = -51)
Divide the result by the number of games you will have completed, including this one (in your case, -51 / 19 = -2.68) Round the result to the nearest whole number and this is what happens to your rating.
In your case, this formula only applies one more time. New players have the added complication that all the "real" provisional rating is hidden until you have finished five games. Nonetheless, you can see how the formula behaves by looking at the first few bars of anyone's ratings graph who has finished between five and 300 games.