Range expanded from Master+ (top 0.1%) to Diamond 2+ (top 0.3%)

Our old MMR range of Master+ doesn’t give us enough data to assess power from win rates (too small of a data set). We revisited expanding the MMR range slightly to see if it was still a similar enough balance state. We see that the balance outliers are nearly the same after expanding the audience slightly, and it gives us the data we need to use winrates (expanding to just Diamond 1+ would have still given us too little data).

The new criteria:

Overpowered Old - greater than 45% ban rate

Overpowered New Greater than 50% ban rate or Greater than 54% win rate if below avg banrate, down to 52.5% win rate if >5x avg banrate

Underpowered Old - Less than 5% combined pick/ban rate

Underpowered New - Less than 7.5% combined pick/ban rate

These winrate thresholds are 0.5% higher than the skilled thresholds to factor in the reality that players of this extremely high MMR have slightly higher winrates overall because they can only be matched against players that are lower skill. In other words we don’t want to nerf champs in this tier unfairly because they are being played by the best players.