Rating System FAQ


Ratings are based on theGlicko2 rating algorithm.

Why am I not on the PR?

You need a minimum of 4 sets in tournament/PR matches before you can be on the PR.

Do individual game wins/losses count?

Only the results of whole sets count -- if you won a game but lost the set 2-1 (in b.o.3), it only counts as a loss.

What are the rules for PR matches?

You can challenge other players to PR matches which contribute to ratings, just like tournament sets. Game rules such as length of sets, legal stages, etc., are as agreed upon between players. You may only be involved in up to 5 PR match sets during any one month period. No player is forced to accept a challenge; it is voluntary. The matches must be played to win - purposely losing to someone is not allowed.

Where can I report PR matches?

E-mail me (Zenja) atizenja@gmail.comor message me on Facebook.

How often do ratings update?

Once per week, usually on weekends. Any matches reported and added in between updates will not change ratings until the next update.

What does my rating mean? What's "rating uncertainty"? Why does my rating decrease slowly over time?

Your rating shown on this site is calculated based on two factors: a calculated estimate of your skill level,and your rating uncertainty. The skill estimate is the mean estimate of your "real" skill level, with equal chance that it is higher or lower, and it changes by winning or losing sets. However, that rating is not the default displayed rating in the rankings list. The displayed rating is instead a conservative estimate that minimizes the chance of overrating a player, and takes uncertainty into account. For example, if a newcomer plays only a few games but beats highly rated players, his skill estimate will be high, but the system lacks confidence in it compared to an established player because it may partially have been due to luck. That's where the rating uncertainty comes in: it represents how confident the system is in a rating. The uncertainty starts high for a new player and decreases as they play games. It slowly increases for everyone over time, causing more recent matches to have a bigger effect on rating than older ones.

Your displayed rating is your hidden rating minus your rating uncertainty. The result is that, statistically, there's a 95% chancethat your displayed rating is at least your "true" rating. This means that the more games you play, the more confident the system is in your rating and the closer (higher) your displayed rating will be to your hidden rating. It means that if two players are equally skilled, the more active one will have a slightly higher rating. It also means that you can gain rating after some inactivity even if your skill level estimate decreases after the tournament.

How does my rating change after a set?

The calculated skill estimate changes based on the difference in skill between you and your opponent, and also based on the uncertainty for both people.If you win against someone rated much lower than you, your score will barely change, and winning against someone rated higher than you will increase your score significantly. Likewise, losing to someone rated much higher than you makes you lose very little, but losing to someone rated lower than you makes you lose a significant amount. The uncertainty matters too: the higher your uncertainty is, the more your rating will change.

Your uncertainty decreases (i.e., the system gets more confident in your rating) regardless if you win or lose, but similar concepts apply as in thehidden rating change. For example, if you beat someone that's either rated much lower than you or their uncertainty is high, your uncertainty won't change much. This is because the set doesn't provide as much information -- if you were very likely to win based on rating, the win didn't really prove anything, and winning against someone whose score the system has confidence in proves more than winning against a newcomer.

How can I get my tournament results to be included?

Contact me (Zenja) as shown above. The tournament should ideally be run throughChallonge.You can then message me your Challonge API key so I can add it to the system and make it easy to pull in the tournament results. To find your API key, log into Challonge, go to your API page (http://api.challonge.com/v1), and click the link to get your API key.