I make a speed rating for the final time and another one for the fastest comparative section, multiply each by the number of furlongs they involved, add them together then divide the sum by the total number of furlongs of the full and sectional sections. This has proven to produce very reliable ratings, much more reliable than straightforward assessments of final time.

I normally compare a slow run race with the fastest on the card. When I did this with the Prix de Sandringham I came up with a rating of 42 for the winner Fintry.