Section 2: Slope Rating
Excerpt from USGA Handicap Manual
A “Slope Rating” is the USGA’s mark that indicates the measurement of the relative difficulty of a course for players who are not scratch golfers compared to the USGA Course Rating (e.g., compared to the difficulty of a course for scratch golfers). A Slope Rating is computed from the difference between the Bogey Rating and the USGA Course Rating. The lowest Slope Rating is 55 and the highest is 155. A golf course of standard playing difficulty has a Slope Rating of 113.