This web site is intended to provide some background in the theory and practice of rating competitors in games and sports.
Two rating systems I have invented:
- The Glicko rating system, which is in the public domain (document revised Sept 10, 2016, to clarify various aspects of the algorithm)
- The Glicko-2 rating system,
an improvement on the original Glicko system.
This document has been revised on November 30, 2013, to provide some advice
on choosing the system parameter tau when the application of the
rating system could involve large collections of extremely improbable
Publicly available Glicko system code/programs:
(Note: I have not tested any of these implementations, so please use at your own discretion)
- Chess Ranking Assistant, an add-in for Microsoft Excel
- PlayerRatings, an R package implementation of Glicko, as well as a few other rating systems
- pyglicko2, a Python implemenation of Glicko-2
- PHP Glicko2 Lib, a PHP implementation of Glicko-2 (on Github)
I applied the Glicko Boost algorithm, which I developed in 2010, to the game outcomes data in the Deloitte/FIDE Chess Rating Challenge.
Coming soon (when I find the time!):
- History of common rating systems
- Rating tutorial
- Online rating calculators (including calculators for Glicko and Glicko-2)
- ... and much more!