Comment by somenameforme

I'm unfamiliar with Go ratings, but chess ratings are based on the Elo system which is a simple mathematical prediction system. Borrowing some figures from Wiki [1] we get:

  1.00 +800
  0.99 +677
  0.9 +366
  0.8 +240
  0.7 +149
  0.6 +72
  0.5 0
  0.4 −72
  0.3 −149
  0.2 −240
  0.1 −366
  0.01 −677
  0.00 −800

The second column is your rating minus your opponent's, and the left is your predicted result. So if you are rating 1849 and your opponent is rated 1700 then you'd be expected to score about 70%. To have a 1% expected score against Magnus, you'd need a rating of about 2150.

[1] - https://en.wikipedia.org/wiki/Elo_rating_system