Posting your golf scores is a vital part of the United States Golf Association’s handicap system. A player’s USGA handicap index is based on the best 10 of his previous 20 rounds and is updated throughout each golf season. Players must report every 9- or 18-hole score, provided it’s achieved on a course with a USGA slope and course rating, which includes the great majority of courses in the U.S. Posting each score keeps a player’s handicap index “accurate and up to date,” says the USGA.