Whats up with the new graph?

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http://yakartinka.ru/u/327/966/5a65ed4d3159.png
http://yakartinka.ru/u/818/643/e98c8b59Ae77.png

Where can I read about the scoring? I lost 10 points a piece in two games and then won 25 against the same player in a third game. I dong get it. Great site and thanks for the effort.

Here you can find the long explanation about the Elo Scoring System used here on Lichess.org

http://en.wikipedia.org/wiki/Elo_rating_system

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My own information (this is only an example not the actual numbers used).

Lets pretend Player1 is rated 1000.
Opponent A is rated 900
and Opponent B is rated 1300.

When Player1 defeats Opponent A he will get a few points.
When Player1 loses to Opponent A he will lose more points

When Player1 defeats Opponent B he will get a lot of points.
When Player1 loses to Opponent B he will lose very little.

When it comes to draws the points will only change slightly.
The higher rated player will lose a few points in a draw.
The lower rated player will gain a few points in a draw.