OK. so, the green on the reverse will be the complement to the number 18 for the hole being played.
For example, the 2nd will play to the 16th.
And the 9th will play to the 9th
And the 13th will play to the 5th.
And the 18th will play to the, gosh, 18th
For the teeing area, the tee will be the complement to the number 20 for the hole being played (well, sort of).
For example, the 2nd will play from (near) the 18th tee.
The 10th will play from the 10th tee,
The 13th will play from the 7th tee.
And the 18th will play from the, gosh, 2nd tee.
Obviously, we start at the first tee - the exception proves the rule
Now I am less confused.
James B