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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?

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    This is a customer support question. – SmallChess Feb 9 '18 at 14:20
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This is a list of Magnus Carlsen’s ratings at each of his birthdays.

  • 9 years old: 900
    Norwegian rating.

  • 10 years old: 1645
    Still Norwegian rating.

  • 11 years old: 2127
    FIDE rating now.

  • 12 years old: 2250
    Magnus became an FM at age 11.

  • 13 years old: 2450
    Magnus became an IM at age 12.

  • 14 years old: 2581
    Magnus became a GM at age 13, the youngest in the world and the second youngest ever at the time.

  • 15 years old: 2570
    Magnus went through his only real slump that year.

  • 16 years old: 2698
    Magnus played in his first super tournaments right around this time.

  • 17 years old: 2714
    Magnus reached 2700 at 16 as the youngest ever, a record that has since been beaten by Wei Yi.

  • 18 years old: 2786
    Magnus was now number four in the world.

  • 19 years old: 2801
    Magnus reached 2800 at 18 as the youngest ever. The record still stands.

  • 20 years old: 2802
    Magnus became the highest rated player in the world at 19, as the youngest ever.

  • 21 years old: 2826
    Magnus solidified his top spot on the world rankings this year, and has held it since.

  • 22 years old: 2848
    Magnus was really closing in on Kasparov’s rating record now, and surpassed it shortly after his 22nd birthday.

  • 23 years old: 2870
    At this point there was a whopping 70 point difference between Magnus and the second rated player, Aronian.

  • 24 years old: 2863
    Magnus peaked at 2882 (unofficially 2889) that year, the highest rating ever.

  • 25 years old: 2850
    A minor dip in form.

  • 26 years old: 2853
    Still number one by a good margin.

About the app - of course there may be flaws, concerning its system there is no information. Although I don't see any reason why they would deviate from the ELO system (which is used in official FIDE games), whose formulas aren't secret and can be found even on Wikipedia.

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