It’s that time of year that many clubs are hosting their annual Member-Guest tournament usually consisting of a round robin. How do you combine those scores to post?

The USGA recommends that the following method be used to combine nine-hole scores in a Round Robin format or in other events when the format requires 27 holes or multiple individual nines. The first two nines played on any day are combined to form an 18-hole score. The third nine is posted as a nine-hole score and becomes a part of the scoring record when combined with another nine-hole score.

An exception would occur if, for example, a player plays 27 holes in one day, and the first nine is a practice round. If this were the case, the nine-hole practice round would be posted as a nine-hole score, and the subsequent two nine-hole rounds would be combined to form an 18-hole score.

Both the first two nines and subsequent two nine-hole rounds referenced in this answer are eligible to be posted and designated as an 18-hole tournament score. (REVISED)