I played a total of 261 games against the Play Magnus app at different ages. My overall score is 144 wins, 99 losses and 16 draws. My last game was against the 10-year-old Magnus. Prior to the start of the game I was rated 1248. I won the game and my rating increased by an astonishing 133 points, so I was wondering what is the rating system used.
Most weird is that I sometimes draw against a far higher rated Magnus and lose rating points (I once drew 26-year-old Magnus and lost 18 rating points when I was rated only 1486). Is there any explanation for that, or is it a bug in the app?