Ratings Central: The World’s Most Accurate Rating System
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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
2019-11-14NTTC 2019 Spring Comp B Grade R10NTTCAUSTT
2019-11-13BTTA Fixtures Tuesday (12/11/2019)BTTAQLDAUSTT
2019-11-13Loops Season 6 Wednesday Night Division 1 R11HWATTVICAUSTT
2019-11-13BDTTA 2019/20 Summer Pennant A R6BDTTAVicAUSTT
2019-11-13NTTC 2019 Spring Comp A Grade R10NTTCAUSTT
2019-11-12Minnesota TC RRPTTMNUSATT
2019-11-12Loops Season 6 Tuesday Night Division 3 R0HWATTVICAUSTT
2019-11-12BDTTA 2019/20 Summer Pennant B R6BDTTAVicAUSTT
2019-11-12TTACT 2019 Spring Pennant Div 3 Rnd 14TTACTACTAUSTT
2019-11-12ES&CTTA 2019 Spring A Rnd SFES&CTTAVICAUSTT
2019-11-12NTTC 2019 Spring Comp B/R Grade R10NTTCAUSTT
2019-11-112019 SNDTTA Spring - 2019-11-11SNDTTAAUSTT
2019-11-11Loops Season 6 Monday Night Division 2 R11HWATTVICAUSTT
2019-11-11Edinburgh & Lothians League: Nov 11 - Nov 17 2019SCOTT
2019-11-11Sunshine & District TTA 2019 Mon S3 - Semi FinalSDTTAVICAUSTT
2019-11-11TTACT 2019 Spring Pennant Div 2 Rnd 14TTACTAUSTT
2019-11-11BTTA Fixtures Monday ( 11/11/2019 )BTTAQLDAUSTT
2019-11-11Pure Pong Monday LeaguePPitPORUSATT
2019-11-11ES&CTTA 2019 Spring C Rnd SFES&CTTAVICAUSTT
2019-11-11NTTC 2019 Spring Comp A/R Grade R10NTTCAUSTT
2019-11-10OÖTTV Meisterschaft 2019/20 (Spiele KW 45/2019)OÖTTVAUTTT
2019-11-10Super Sunday LeaguePPCORUSATT
2019-11-10BTTV-Meisterschaft (Spiele KW 45/2019)BTTVAUTTT
2019-11-10KTTV Meisterschaft (Spiele KW 45/2019)KTTVAUTTT
2019-11-10NÖTTV Meisterschaft und Cup (Spiele KW 45/2019)NÖTTVAUTTT

TT = Table Tennis. HTT = Hardbat Table Tennis. STT = Sandpaper Table Tennis.
Events: 33,534. Players: 93,414. Matches: 3,692,612.