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
2019-08-182019 SNDTTA Spring - 2019-08-18SNDTTAAUSTT
2019-08-18Super Sunday LeaguePPCORUSATT
2019-08-17CCTTA Competition 3 2019 - 2019-08-17CCTTAAUSTT
2019-08-17MSA Gewo Siri 4 / 2019 - Division 3 (Spoon)MSASelangorMASTT
2019-08-17NWTTC Saturday RR MatchNWTTCMNUSATT
2019-08-17Minnesota Saturday OpenMNUSATT
2019-08-172019 Anaheim Table Tennis Tournament - AugASTTCCAUSATT
2019-08-17TTW Saturday SinglesWWTTNew South WalesAUSTT
2019-08-17Mastiff TTC LeagueMastiff TTCMAUSATT
2019-08-16VTTA Winter Round 10 2019VTTAVICAUSTT
2019-08-15BTTA Fixtures Tuesday 13/8/19BTTAQLDAUSTT
2019-08-15Minnesota TC RRPTTMNUSATT
2019-08-15ES&CTTA 2019 Winter A1 Rnd GFES&CTTAVICAUSTT
2019-08-15TTACT 2019 Spring Pennant Div 4 Rnd 2TTACTACTAUSTT
2019-08-15SDTTA 2019 Season 2 Pennant - GrandFinalSDTTAVICAUSTT
2019-08-14TTACT 2019 Spring Pennant Div 1 Rnd 2TTACTAUSTT
2019-08-14GVTTC Summer Open League ’19 Week03GVTTCNYUSATT
2019-08-14Loops Loops Vs Malaysia R0HWATTVICAUSTT
2019-08-142019 TTV Premier League Season2 Wed Rd SFTTVVICAUSTT
2019-08-14Rochester, MN Wednesday LeagueRTTCMNUSATT
2019-08-14Sunshine & District TTA 2019 Wed S3 - Round 2SDTTAVICAUSTT
2019-08-142019 TTG Winter Comp Week 5TTGNSWAUSTT
2019-08-14Wednesday Novice LeaguePPCORUSATT
2019-08-13Port Mac TuesdaysPMTTCNSWAUSTT
2019-08-13Minnesota TC RRPTTMNUSATT

TT = Table Tennis. HTT = Hardbat Table Tennis. STT = Sandpaper Table Tennis.
Events: 32,540. Players: 91,767. Matches: 3,580,737.