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Handicap Differential. First, you determine the handicap differential for each round of golf you played, up to the last 20 rounds. Subtract the USGA course rating from your score. Take the difference and multiply it by the standard USGA slope rating, which is 113.Then divide that number by the course's slope rating.andicap Index. To calculate your handicap index, you average a certain number of your best handicap differential scores, depending on how many scores you have accumulated. Ideally, you want 20 scores, so you can use the lowest 10 of the last 20.
The Handicap Rules for Match Play. Golf's handicap system allows players to compete equitably in a match-play competition, whether two or four players are involved. Digital Vision./Photodisc/Getty Images.he other player gets his handicap strokes by subtracting the other player's handicap from his. For example, your handicap for this course is 15 and your opponent's is a 6. Subtract 6 from 15; your handicap is 9 and your opponent plays scratch.