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
2019-11-21TTW Saturday SinglesWWTTNew South WalesAUSTT
2019-11-21Armidale Thurs NightArmidale TTCNew South WalesAUSTT
2019-11-20ES&CTTA 2019 Spring B Rnd GFES&CTTAVICAUSTT
2019-11-20BTTA Summer Mini Fixtures Tuesday (19/11/2019)BTTAQLDAUSTT
2019-11-20TTACT 2019 Spring Pennant Div 4 Semi FinalsTTACTAUSTT
2019-11-20BDTTA 2019/20 Summer Pennant A R7BDTTAVicAUSTT
2019-11-20NTTC 2019 Spring Comp Semi FinalsNTTCAUSTT
2019-11-20Loops Season 6 Wednesday Night Division 1 R12HWATTVICAUSTT
2019-11-20Wednesday Novice LeaguePPCORUSATT
2019-11-202019 TTV Premier League Season3 Wed Round 10TTVVICAUSTT
2019-11-202019 Coburg Pennant Wednesday Round 9CoburgVICAUSTT
2019-11-20Sunshine & District TTA 2019 WED Xmas - Round 2SDTTAVICAUSTT
2019-11-20Rochester, MN Wednesday LeagueRTTCMNUSATT
2019-11-19Port Mac TuesdaysPMTTCNSWAUSTT
2019-11-19Minnesota TC RRPTTMNUSATT
2019-11-19ES&CTTA 2019 Spring A Rnd GFES&CTTAVICAUSTT
2019-11-19BDTTA 2019/20 Summer Pennant B R7BDTTAVicAUSTT
2019-11-19Loops Season 6 Tuesday Night Division 3 R0HWATTVICAUSTT
2019-11-182019 SNDTTA Spring - 2019-11-18SNDTTAAUSTT
2019-11-18TTACT 2019 Spring Pennant Div 2 Semi FinalsTTACTAUSTT
2019-11-18Loops Season 6 Monday Night Division 2 R12HWATTVICAUSTT
2019-11-18Edinburgh & Lothians League: Nov 18 - Nov 24 2019SCOTT
2019-11-18Sunshine & District TTA 2019 Mon S3 - Grand FinalSDTTAVICAUSTT
2019-11-18BTTA Fixtures Monday ( 18/11/2019 )BTTAQLDAUSTT
2019-11-18ES&CTTA 2019 Spring C Rnd GFES&CTTAVICAUSTT

TT = Table Tennis. HTT = Hardbat Table Tennis. STT = Sandpaper Table Tennis.
Events: 33,630. Players: 93,470. Matches: 3,698,649.