I maybe wrong, but I think you mean 'equitable stroke control' whereby unusually high individual hole scores are reduced in calculation of a player's handicap to be more indicative of that player's ability. I believe the system calculates your handicap with that consideration. Of course, your handicap isn't 'official' unless you post your scores with a USGA affiliated club, or are a member otherwise. There are some differences with the various bodies in terms of minimum rounds needed to obtain a handicap. Then it's just a matter of the averages of the indexes of those best rounds, and then x .96.