Section 5: Rules of Play

Rule 5.1: A round consists of playing the holes of the course in the correct order, unless the Committee allows or requires another order. A round consists of 18 holes unless a shorter number is set by the Committee.

Source: Rule 5, Rule 5.1, Rule 5.2, Rule 6, Rule 6.1, Rule 6.3, Rule 6.4, Rule 7, Rule 7.1, Rule 7.4, Rule 18.2, Rule 8.1, Rule 13.1, Rule 9.2, Rule 14.2, Rule 10.1, Rule 14, Rule 14.1, Rule 14.3, Rule 18.1

Send this to your friend — argument over.