The stroke index on a golf scorecard indicates the difficulty that the committee assigned to a hole based on the scoring by club members. Holes are marked between 1 and 18, or 1 to 9 on a 9-hole course. Every hole is assigned a number indicating the difficulty of the hole. Stroke 1 is the most difficult hole on the course and stroke 18 is the easiest hole on the course. Courses number one loop (9 holes) with even numbers and the other loop with odd numbers.