Making the course come back to the clubhouse at the 9th hole eliminates 80-90% of potential routings. Sometimes it works out as the best solution, other times you are forcing it.
If you make it come back to the clubhouse somewhere, but it doesn't have to be the 9th, then you only eliminate some of the options. [The exact % depends on the shape of the property and whether the clubhouse can be somewhere central.]
Dr. MacKenzie wrote in 1920 that the course should be arranged, if possible, in two loops of nine holes. When he went back and revised his thoughts in The Spirit of St. Andrews, in 1931-32, he said that he wished he had never made that observation, because so many committees insisted on it even where it didn't work well.
It's a long time since I have thought about what % of my courses return at the 9th. Both courses at Stonewall return at the 8th . . . the first one because I'd modified the original Fazio routing, and for the second that's just how it was working out, and I knew they could live with it.
Courses that do return at the 9th: High Pointe, Legends, Barnbougle, Ballyneal, Tara Iti, Cape Kidnappers [Mr. Robertson insisted, on the grounds that Shinnecock Hills returned at the 9th]
Courses that return, but not at the 9th: Stonewall [8th, x2], Pacific Dunes [7th], Rock Creek [15th]
Courses that don't return until the end: The Loop, Old Macdonald, Stone Eagle, St. Andrews Beach
Courses that don't return at all
[size=78%]: [/size][/size]Black Forest, Dismal River[size=78%][/size]Of my new ones: Memorial Park and St. Patrick's return at the 9th. The new ones in NZ and Wisconsin do not. It's really easier to figure them out when you don't care one way or the other!![size=78%]