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
2019-10-17NTTC 2019 Spring Comp B Grade R6NTTCAUSTT
2019-10-17Manningham 2019 Spring Pennant FinaleMannVICAUSTT
2019-10-17SDTTA 2019 Season 3 Pennant - Round 5SDTTAVICAUSTT
2019-10-17Minnesota TC RRPTTMNUSATT
2019-10-16BTTA Fixtures Tuesday (15/10/2019)BTTAQLDAUSTT
2019-10-16Loops Season 6 Wednesday Night Division 1 R7HWATTVICAUSTT
2019-10-16BDTTA 2019/20 Summer Pennant A R2BDTTAVicAUSTT
2019-10-16NTTC 2019 Spring Comp A Grade R6NTTCAUSTT
2019-10-16Wednesday Novice LeaguePPCORUSATT
2019-10-16GVTTC 2019 Wed Fall League Week 4GVTTCNYUSATT
2019-10-16Rochester, MN Wednesday LeagueRTTCMNUSATT
2019-10-16ES&CTTA 2019 Spring B Rnd 7ES&CTTAVICAUSTT
2019-10-15Port Mac TuesdaysPMTTCNSWAUSTT
2019-10-15Minnesota TC RRPTTMNUSATT
2019-10-15Loops Season 6 Tuesday Night Division 3 R0HWATTVICAUSTT
2019-10-15BDTTA 2019/20 Summer Pennant B R2BDTTAVicAUSTT
2019-10-15GVTTC Classic League ’19-’20 Week 3GVTTCNYUSATT
2019-10-152019 DVTTA Spring Section 3 + 4 Round 08DVTTAVICAUSTT
2019-10-15ES&CTTA 2019 Spring A Rnd 8ES&CTTAVICAUSTT
2019-10-15NTTC 2019 Spring Comp B/R Grade R6NTTCAUSTT
2019-10-15MPTTA 2019 Spring Week 4MPTTAAUSTT
2019-10-142019 SNDTTA Spring - 2019-10-14SNDTTAAUSTT
2019-10-14CCTTA Competition 3 2019 - 2019-10-14CCTTAAUSTT
2019-10-14Loops Season 6 Monday Night Division 2 R7HWATTVICAUSTT
2019-10-14Sunshine & District TTA 2019 Mon S3 - Round 7SDTTAVICAUSTT

TT = Table Tennis. HTT = Hardbat Table Tennis. STT = Sandpaper Table Tennis.
Events: 33,173. Players: 92,957. Matches: 3,645,457.