text: In April 2010 GA adopted the USGA calculation method using the average of the best 10 differentials of the player's past 20 total rounds, multiplied by 0.96. In September 2011 this was altered to the best 8 out of 20 rounds, multiplied by 0.93. The reasons for these changes were cited to restore equity between high and low handicaps. An ‘anchor' so that handicaps could not increase by more than 5 in a rolling 12-month period, slope ratings, and a more sophisticated version of CCR called the Daily Scratch Rating (DSR) were implemented on January 23, 2014.
  GA Handicap System overview
  The GA Handicap System is based on the Stableford scoring system, and uses slope and course rating (called "Scratch Rating"). For handicapping purposes, the scratch rating is adjusted to reflect scoring conditions ("Daily Scratch Rating"), and all scores are converted into Stableford points, called the Stableford Handicap Adjustment (SHA) and inherently applying net double bogey adjustments, regardless of the scoring system being used while playing.
  Handicaps are calculated from the best 8 adjusted differentials, called "sloped played to" results, from the most recent 20 scores. Should there be 3 or more but fewer than 20 scores available, a specified number of "sloped played to" results are used, per the table below.