Thanks but the problem is that there are bands.
Take the below table which is in various websites:
- Class 1 Listed Handicaps for horses rated 96-110+.
- Class 2 This includes the Heritage Handicaps. The rating bands for this class are 86-100, 91-105 and 96-110.
- Class 3 The ratings band for this class are 76-90 and 81-95
- Class 4 For horses rated 66-80 and 71-85
- Class 5 For horses rated 56-70 and 61-75
- Class 6 For horses rated 46-60 and 51-65.
- Class 7 Generally these are classified stakes races for horses rated 0-45.
As you can see a rating of less than 90 could be a class 2,3,4,5,6 or 7.
Any given Official rating could be in at least two different classes, so unless I am reading this wrong, ratings are not an accurate way to narrow down races into classes.