haiderbaig

Hi everyone and thank you for any replies in advance. We run a golf league out of Pakistan and recently there has been confusion on specifically what is the definition of a Differential. In calculating your handicap the rules state you must average "the best 8 Score Differentials™ out of your most recent 20 scores." My question is that we have a lot of members who only play 9 holes. So would they have to play 40 9-hole rounds to be considered as 20 18-hole rounds for differential calculations?