Welcome!

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


On June 1, 2019, we will be modifying the temporal-update algorithm and will reprocess all events. Everyone’s rating will change. All historical ratings will change.

Currently, 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 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.)

When we reprocess all events, the ratings of 99.99% of the players will increase or stay the same. The average gain will be 42 points. Only 0.02% of players will gain more than 300 points.

We were motivated to consider changes 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 produces more accurate ratings.


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
2019-05-23CCTTA Competition 2 2019 - 2019-05-23CCTTAAUSTT
2019-05-23SDTTA 2019 Season 2 Pennant - Round 2SDTTAVICAUSTT
2019-05-23Minnesota TC RRPTTMNUSATT
2019-05-23TTACT 2019 Autumn Pennant Div 4 Rnd 12TTACTACTAUSTT
2019-05-22BTTA Fixtures Tuesday (21/05/2019)BTTAQLDAUSTT
2019-05-22NTTC 2019 Autumn Comp Semi FinalsNTTCAUSTT
2019-05-22TTACT 2019 Autumn Pennant Div 1 Rnd 12TTACTAUSTT
2019-05-22Loops Wednesday Night Division 1 2019 R16HWATTVICAUSTT
2019-05-22BDTTA 2019 Winter Pennant A R5BDTTAVictoriaAUSTT
2019-05-22Sunshine & District TTA 2019 Wed S2 - Round 3SDTTAVICAUSTT
2019-05-22Rochester, MN Wednesday LeagueRTTCMNUSATT
2019-05-22Novice LeaguePPCORUSATT
2019-05-21Port Mac TuesdaysPMTTCNSWAUSTT
2019-05-21Coburg TTC Summer Pennant 2019 | Grand FinalsCoburgVICAUSTT
2019-05-21Minnesota TC RRPTTMNUSATT
2019-05-21TTACT 2019 Autumn Pennant Div 3 Rnd 12TTACTACTAUSTT
2019-05-21AWTTA 2019 Winter Div 1 Rd 4AWTTAVICAUSTT
2019-05-21Loops Tuesday Night Division 5 2019 R0HWATTVICAUSTT
2019-05-21BDTTA 2019 Winter Pennant B R5BDTTAVictoriaAUSTT
2019-05-202019 SNDTTA Autumn - 2019-05-20SNDTTAAUSTT
2019-05-20Shepparton Winter Comp Wk 4STTAVICAUSTT
2019-05-20TTACT Autumn Div 2 Round 12TTACTACTAUSTT
2019-05-20BTTA Fixtures Monday (20/05/2019)BTTAQLDAUSTT
2019-05-20Monday Spring LeaguePPCORUSATT
2019-05-20Loops Monday Night Division 2 2019 R0HWATTVICAUSTT

TT = Table Tennis. HTT = Hardbat Table Tennis. STT = Sandpaper Table Tennis.
Events: 31,753. Players: 90,885. Matches: 3,525,643.