A Cha-Cha-Cha, also known as a 1-2-3 Best-Ball, is a form of Best-Ball competition for 3 or more competitors, in which the number of balls to be scored begins with one ball on the first hole (hole no. 1), two balls on the second hole, three balls on the third hole, then repeats for the remainder of the round:
Similarly, a Cha-Cha alternates between one ball on the first hole, two balls on the second hole, then repeating:
Handicap allowances for a Cha-Cha-Cha are typically calculated like a 2 Best-Balls of Four competition, using a handicap allowance of 90% of Course Handicap for men and 95% of Course Handicap for women.
In other circumstances, it may be preferable to calculate handicap allowances for a Cha-Cha-Cha as a 1 Best-Ball of Four competition – 80% of Course Handicap for men and 90% of Course Handicap for women.
In four-ball play the USGA recommends reducing the Course Handicaps of higher-handicapped partners to a limit of 8 strokes greater than the lower-handicapped teammate, or reducing the Course Handicaps of all the teammates by 10% on teams with handicap disparities greater than 8 strokes. This adjustment makes for fairer play, but is not required.