Rating Systems

Rating Systems attempt to assign a numeric measure to a player's strength based upon the player's results in games against other players. There are a number of rating systems in use across the globe. Some ratings systems are limited to particular countries or organizations others span either a continent or the entire globe via Internet play.

Rating Systems

• BayesElo
• Belgian
• Canadian
• Danish
• Elo
• EloStat
• French Ladder which is essentially GoR with parameters retuned
• Glicko Rating
• GoR used by the European Go Federation (EGF)
• Ingo
• Korean Professional
• Sonas by Jeff Sonas? of ChessMetrics
• TruSkill: A Bayesian skill rating system
• Whole History Rating a modern rating system claiming to have the highest accuracy for rating players whose playing strength changes over time.
• Russian (text in Russian)

National Professional Organization Ratings

• Chinese Pro Ratings
• Hankuk Kiwon Pro Ratings
• ^[1]

National and Regional Amateur Ratings

• American Go Association
• European Go Database
• Japanese Points Rating System

Go Server Rating Systems

• CyberOro
• Dragon Go Server
• KGS

Comparisons

• Rating Histogram Comparisons – Graphs and some theory, comparing AGA, EGD, KGS and, for reference USCF (chess)
• Rank Worldwide Comparison – Tables of equivalent strengths in 5 amateur and 7 go server rating systems
  • /DataCollection Our data on which these tables are based
• Historical Ratings of Japanese and International Players - Japan: 1951-current World: 1990-current

Other

• Discussion pages:
  • FIDE titles and EGF Go ratings – Comparisons between chess and Go ratings (initiator: tderz)
• Personal musings (with some discussion)
  • Holigor's Rating Of Go Players – Ratings by HolIgor and some ideas (not updated between 2004 and 2022-01-01)
  • Migeru's musings on go ratings – Comments by Migeru on weaknesses in ELO-based rating systems such as the EGD
  • Internet Ratings Database – A proposal by Stormer for a unified ratings database for information exchange between Go servers
  • How to align rating systems – A proposal by Reflame for how to harmonise the various rating systems
• Point ranking schemes, used to set handicap and komi in clubs or small groups
  • Point Ranking Scheme at Tokyo Go Clubs – How several clubs in Tokyo do it
  • Simple point ranking scheme – A proposal by axd
• Other resources:
  • https://www.goratings.org/en/ – Up-to-date ELO ratings for professional players globally, maintained by Rémi Coulom
  • ^[1] – A Japanese rating page which no-one has described in any detail here (as of 2022-01-01)
  • EGF Rating per Rank – Brief notes on conversions between EGD ratings and tradtional ranks, with some statistics
  • Rating Theory Homepage – As of 2022-01-01 this seems to have been hijacked by blockchain spammers (perhaps it is archived)

[1] http://kashi.dip.jp/~kashi/rating/rating.pdf seems to comprise interesting content w.r.t. ELO (I guess, tderz). As it is written in Japanese (which I cannot read beyond some Igo-terminology) s.o. else might comment more on it.
Some figures resemble derivative pricing model graphs near expiration, where volatility goes up and normal Black & Scholes do not hold anymore.
With Go that would be slightly different: near same strengths encounters give very predictable results,
high strength difference encounters bear high uncertainty/volatility/deviation.