Please visit: raceform.co.za/statistics/the-power-of-ratings
Ratings used here are Ability Ratings (AR) representing career-best performances of horses, from races in South Africa only. Ability Ratings (AR) have been in use for South African racecourse performances since 1985. They are produced by the publishers of Sires 2018, and are routinely used in the daily races published in Sporting Post.
The methodology and scale of Ability Ratings (AR) are directly comparable to those published in the UK by Timeform (TFR) and Racing Post (RPR). The AR, like TFR and RPR, is expressed in pounds, rather than half kilos as is the norm with the official MR ratings published in South Africa by the NHA (formerly known as the Jockey Club). More on the subject can be found at www.sportingpost.co.za/racings-secrets-revealed