Leaderboard/rating????

#8 - Oct. 14, 2014, 9:46 a.m.

The leaderboards are currently ranked by your Glicko2 matchmaking rating (MMR) which is hidden.

How much your ranking changes depends on a few things.

• Your current MMR deviation. Glicko2 tries to factor in how well it knows you. If it doesn’t know you, it will adjust your MMR more to try and find the best placement for you.
• The MMR of the team you last fought against. A win against a higher MMR team will raise you faster, while a loss against a lower MMR team will lower you faster.
• Decay. The leaderboard itself has a decay mechanism that will lower your ranking after periods of inactivity. However, since we don’t want to destroy your MMR because its valuable for matchmaking, this decay is only on the leaderboard itself, so when someone plays a match after a long-ish period of inactivity they will jump around faster.
• How much the other players around you are moving. The people near you are probably very close to you in MMR, so any small changes can mean a relatively big jump.

How does matchmaking work?
Right now the algorithm is incredibly simple. (Read: not intelligent)

• For solo arena we find 10 players near the same MMR and then shuffle those players into teams to make the teams as even as possible (MMR-wise).
• For team arena we find 5 players near the same MMR, no shuffling. We then find another team near the same MMR and put them together.
• The range of players you get paired with grows over time as you’re waiting to increase chances of finding a match. Which can lead to playing with people outside your skill range (usually lower).
• It doesn’t factor in PvP rank, profession, leaderboard rank, or anything else. It’s all about the MMR.

#12 - Oct. 14, 2014, 3:56 p.m.

uberkingkong.8041:

Like I said its the volatility of leaderboard decay for the vast majority while a small minority don’t see any.

Leaderboard decay works, put simply, by multiplying the player’s MMR by a configured percent by the power of how many hours they have been inactive (after the first). Since it works by percentage, and not a fixed amount, players at the top actually see a larger decay in terms of fixed amount.

LeaderboardRating = ActualRating * pow(DecayRate, HoursInactive)

This decay exists only on the leaderboard, and is not used for matchmaking. The decay will also be completely erased from the leaderboard the next time it updates after you play a game.

#15 - Oct. 14, 2014, 5:08 p.m.

Aitadis.8269:

Played 1 game in which I LOST and went from 52% to r13 in solo que lol

This is most likely because your decay was erased, not because your actual MMR was adjusted by a huge amount.

#21 - Oct. 14, 2014, 9:44 p.m.

Seiishizo.7162:

how would you explain this?
http://imgur.com/jjHRu8W

Worst case scenerio, assuming this is all solo players queued for team arena, this likely because team arena does not shuffle teams to make them even and you were put into best fitting team available at the time the team was formed.

Best case, this spread is caused more by the self selection of players forming their own rosters to play together.

The truth is probably somewhere in between.

However, there is a known (to us) flaw with team arena matchmaking. It will never try to reform a team (to try to find a better fit) once its been created. So you are stuck with the best team it could do at the time, and have to wait until it finds another team within range comes along. This is also why team arena queues can sometimes take longer, or why even a bad match can pop quickly.

Seiishizo.7162:

But if it’s based on MMR i would assume that the MMR of a #3 player would be way way higher than a 97% player.

That is an incorrect assumption. The MMR spread between a rank 3 and 97% can actually be very small. Your leaderboard rank (for the top players) is your position in a sorted list, and does not represent the distance between players other than to say one is lower than the other.

#29 - Oct. 17, 2014, 1:38 p.m.

skullfaerie.7203:

Out of curiosity, what about those random matches that pop seconds after hitting the queue button

If it isn’t you that had to wait then it was someone else.