Welcome!

Welcome to Ratings Central, home of the world’s most accurate rating system!


On June 1, 2019, we modified the temporal-update algorithm and reprocessed all events. Everyone’s rating changed. All historical ratings changed.

Previously, if the rating system had not seen a player for a year, the standard deviation of the player’s law increased by at most 70 points.

With the new algorithm, if the rating system has not seen a player for a year, the standard deviation of the player’s law will increase by at most 79.4 points and the mean will increase by 7 points. However, the increase in mean will not be credited until the player plays in an event. (The new temporal-update is the sum of a mean-zero normal random walk with a variance of 70² per year and a Poisson jump process with jumps of 200 points, a mean of 7 points per year, and a variance of 200 × 7 per year.)

With the new model, players sometimes get better in jumps, while before they only got better in steps.

When we reprocessed all events, the ratings of 99.99% of the players increased or stayed the same. The average gain was 42 points. Only 0.02% of players gained more than 300 points.

We were motivated to consider improvements to the algorithm by a major event director who felt that the ratings for their players were deflating. After a year of experimentation and investigation, we concluded that part of the deflation was due to their choice of priors. However, even after using better priors, there still appeared to be some deflation. A related problem is that sometimes the system can be slow to react when a player improves rapidly. We think the new temporal-update algorithm better models how player playing strengths actually change and produces more accurate ratings.


On May 26, 2019, we added new categories of examples to Examples of Point Changes.

For more information on Ratings Central, including how your club, league, or tournament can join, see Info. And, be sure to take a look at what people are saying about Ratings Central.

If you run tournaments, take a look at Zermelo. Zermelo can help you run your tournament and submit it to Ratings Central or USATT, or can be used without using Ratings Central.

Recent Events
DateNameClubState/ProvinceCountrySport
2019-09-19NTTC 2019 Spring Comp B Grade R4NTTCAUSTT
2019-09-192019 Divison 2 Club ChampionshipAWTTAAUSTT
2019-09-19ES&CTTA 2019 Spring A1 Rnd 4ES&CTTAVICAUSTT
2019-09-19TTACT 2019 Spring Pennant Div 4 Rnd 7TTACTACTAUSTT
2019-09-18BTTA Fixtures Tuesday (17/09/2019)BTTAQLDAUSTT
2019-09-18NTTC 2019 Spring Comp A Grade R4NTTCAUSTT
2019-09-182019 TTV Premier League Season3 Wed Round 2TTVVICAUSTT
2019-09-18Loops Season 6 Wednesday Night Division 1 R3HWATTVICAUSTT
2019-09-18TTACT 2019 Spring Pennant Div 1 Rnd 7TTACTAUSTT
2019-09-18BDTTA 2019 Winter Pennant A FinalsBDTTAVicAUSTT
2019-09-18Rochester, MN Wednesday LeagueRTTCMNUSATT
2019-09-18Bend TTC - September ’19 Round RobinBend TTCORUSATT
2019-09-18Sunshine & District TTA 2019 Wed S3 - Round 7SDTTAVICAUSTT
2019-09-182019 Winter Pennant B, C, D Grades Rnd 9SSTTNSWAUSTT
2019-09-18ES&CTTA 2019 Spring B Rnd 4ES&CTTAVICAUSTT
2019-09-172019 Divison 1 Club ChampionshipAWTTAAUSTT
2019-09-17Minnesota TC RRPTTMNUSATT
2019-09-17Loops Season 6 Tuesday Night Division 3 R0HWATTVICAUSTT
2019-09-172019 DVTTA Spring Section 3 + 4 Round 04DVTTAVICAUSTT
2019-09-17NTTC 2019 Spring Comp B/R Grade R4NTTCAUSTT
2019-09-17GVTTC Classic League ’19-’20 Tryouts Week 2GVTTCNYUSATT
2019-09-17BDTTA 2019 Winter Pennant B FinalsBDTTAVicAUSTT
2019-09-17DTTC September league 2019 (III)D TTCNYUSATT
2019-09-17TTACT 2019 Spring Pennant Div 3 Rnd 7TTACTACTAUSTT
2019-09-172019 Winter Premier & A graded Rnd 9SSTTNSWAUSTT

TT = Table Tennis. HTT = Hardbat Table Tennis. STT = Sandpaper Table Tennis.
Events: 32,871. Players: 92,327. Matches: 3,604,923.