You can look at each show tell how many points they get for each class and each show. Example, we place 1-6. If there was 6 horses placed in the class:
1st= 6 point
2nd=5 points
3rd= 4 points
4th= 3 points
5th= 2 points
6th= 1 point
If there are less than 6 horses placed, then the first place would be what the total of horses placed and down