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There is a new system in LoL, Champion Mastery. (not to be confused with Masteries)

It shows to a player his own performance compared to other players playing the same champion in the same role.

The score you get depends on some metrics, but they aren't discussed in detail:

It’s based on the champion and role that you just played in a game. So, for example, we look at Annie mid differently to Annie support. We take a series of performance metrics and compare how you do to all other players in your region in your champion / position combination. It is percentile driven - so earning a high score means you performed in the top x% of players on that champ in that position. The grade itself governs the point gains.

Question:
Is "top x% of players" determined by comparing performance of all players irrelevant of their ELO? In other words, when a silver player scores S+ does that mean that he performed as well as a diamond player?

(If that is the case, my guess is that S+ in lower ELO should be rather rare excluding smurfs. Do you see this happening in low ELO?)

Or does a player get compared with roughly same ELO players when determining his score?

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Yes, that is correct.

Champion Mastery takes into account the position you've played and compares your Score (Overall Parameters, not just K/D/A, however details are unknown) with the score of other players playing the same champion in the same role.

It is incorrect however assuming that:

when a silver player scores S+ does that mean that he performed as well as a diamond player?

This is incorrect as even if the Diamond player can only play that champion with a B- rating, and you succeeded with S+ rating, despite you having a better performance, it doesn't necessarly mean that you are better than him (since he is facing stronger opponents after all), it means you perform better at your ELO than he does at his.

Short Awnser, yes, it is independent of MMR

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  • And also, don't forget that your grade doesn't give anything about the teamplay. You can have 10/1/15, if you get caught at the end and lose because of it, then you actually didn't do very well. So saying a S+ would be like playing like a diamand is just impossible. Because the most important difference between high and low elo is the positioning and the decision making. Which are impossible to grade with an algorithm.
    – dyesdyes
    Commented May 21, 2015 at 10:30
  • Yes, but stackexchange policy requires a factual awnser, and the algorithm is still unknown, hence why I didn't include that (at least, not in those words =) )
    – Oak
    Commented May 21, 2015 at 18:22
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when a silver player scores S+ does that mean that he performed as well as a diamond player?

No

(source: high-elo streams)

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