The ratings are produced in an Access database. One of my databases automatically imports all the UK form.
I determined standard times for every track and distance combination. I manually set a going allowance for every single open race. I devised an equation to calculate a rating for each calculated time. One click of a button in one of my databases calculates ratings for all Greyhounds runs from the last year in less than a minute. The rating shown represents the best run within ca. 15% of today's distance from their last four runs. Four points on the ratings equals one length over all distances. I consider a proper open race rating to be 100 upwards. A rating over 115 is top class.