Horses in Photo Finish™ Live are graded based on their genetics.
The Grades are:
D is the lowest grade and SSS is the highest. Each grade is subdivided as such: S-, S, S+.
A horse’s attributes (Start, Speed, Stamina, Finish, Heart, and Temper) are all graded as well (though these can’t be seen till retirement).
Each of these grades shows the strength of the horse in that specific trait. A horse’s Grade is the average of its attribute grades.
Grades are a range. An S grade is not a single number, but a range of numbers. Two horses with S grade Start will have very similar Start, but may not have the exact same value.