Maps and MMR question

[Kaawumba-1133]

@ȐĔƆƐĨPŦŜ-1436

We still have little or no evidence that competitive ladder is goverend by an elo/trueskill derived ratings system.

There are infinitely (quite literally) many-to-few scoring functions that map N parameters down into just two (sr, mmr). There could be some hidden map bias, streak magic, etc, along with a plethora of other factors, and we wouldn’t really know.

Every developer quote is consistent with a TrueSkill type system with tweaks.

@ȐĔƆƐĨPŦŜ-1436

Kaawumba:

Competitive MMR is completely described by a value and an uncertainty for each role.

A dev update/comment on the matter would be nice.

@ScottMercer

Role Queue allows us to track your skill with the three roles separately. So, when you play as a 2100 SR Tank we try to match you with 2100 SR Damage and Support players, both on your team and on the enemy team.

@ScottMercer

If you’re a new player, placements are straight forward. You start at a “new player baseline” SR and when you win games your SR goes up, and losing games lowers your SR. New players are also set at a higher variance level, so the amount of SR you gain and lose is multiplied higher. The matchmaker does this because as a new player it knows very little about your skill and wants to determine it as fast as possible. The increased variance slowly decreases as you play more and more games, and the matchmaker is more confident in identifying your skill.

Unfortunately, Scott has a bad habit of speaking in terms of SR, even though MMR is the real rating.

Here Jeff says that MMR is the real rating: https://www.youtube.com/watch?v=bn8-aWPvLwE&t=1h13m30s