Originally posted by Aiko
Well, if you are rated twice as high as your opponent, the 0,13483 points you will earn are probably rounded to 0.
The rating change formula works on rating difference not a multiple basis.
Where the point at which a game will earn you nothing depends on the rounding the site carries out. Always round down? Round to closest?
If it's the first then a rating of 597 higher than your opponent will give zero points. If it's the second then it's 720. A quick shows a game with a difference of 706 losing a rating point (but not losing one as the winning opponent was Akizy and he has a different K value) for the lower rated player.
As for CrawlIce, by my calculation you will gain a rating point if you win your game against the p1200. Rating change is halved if playing a provisional player. Working through the formula I get +0.61598 rating points which will round up to 1.