What is an average player and what is an intermediate and master player ranked? How high and low does this system work?

# How does the rating system work?

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OGS uses glicko2 as rating system. https://en.m.wikipedia.org/wiki/Glicko_rating_system#Determination

Here an approximation of how the rating system works:

- Each player has a rating (500-3500) and a deviation (indicated by ±)
- After one of your games ends, we take the last 15 games to calculate, how your rating has to change to better predict the outcome of those games.
- The difference of you rating and your opponents rating gives an estimation for how probable it is for each player to win the game.
- For each game the win probability, the outcome (win/lose/draw) and your deviation determine how your rating changes.

Here the ranks of the OGS player base (copied from @S_Alexander’s thread)

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This isn’t quite accurate. We process in batches of 15 games (or 30 days, whichever comes first), but these aren’t rolling. Your 14th game of a batch will be based on the last 14 games, the 15th game will complete the batch, then the 16th game will be the 1st of a new batch, and only compare itself with the previous completed batch.

It’s worth noting that since this graph was generated

- 17 months ago, and
- before we implemented humble rating,

it is most likely out of date.

(and would be LOVELY if @S_Alexander were kind enough to remake it)

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