Anthony:
Copied below are the quotes David Moriarity compiled in another thread that describe the inspiration for the Biarritz template (
http://www.golfclubatlas.com/forum/index.php/topic,21926.0.html). In short, there was a hole at Biarritz, a not very good par 4, that had a hogsback (raised area) in front of the green with the land after the hogsback dropping back down in front of a (raised) plateau green. CBM adapted these features from the Par 4 onto a long Par 3. Over the years, the hogsback in front of the green has become what we know think of today of the front portion of a Biarritz green.
CBM mentioned what became known as his Biarritz concept shortly thereafter in a letter printed in a June 20, 1906 NY Sun article about his recent trip abroad:
"The best holes have not been found on the five British championship links alone. . . . The idea for one hole comes from Biarritz. The hole in question is not a good one, but it revealed a fine and original principle that will be incorporated into my selection."
CBM expanded on the description later that year in his article on ideal holes in Outing Magazine where he provided a sample listing of 18 holes:
"15. 210 yards. Suggested by 12th Biarritz making sharp hog back in the middle of the course. Stopping thirty yards from the hole bunkered to the right of the green and good low ground to the left of the plateau green."
H.J. Whigham repeated this early understanding in 1913 when describing the inspiration for Piping Rock's Biarritz:
"There is a Biarritz hole of about 220 yards which is new to this country and is one of the best one-shot holes in existence. There is a hog's back extending to within thirty yards of the green and a dip between the hog's back and the green."
I'd suggest reading that thread in its entirety. It is conclusive that the inspiration for the Biarritz template came from the 12th hole at Biarritz. The only thing that isn't conclusive is exactly which hole was the 12th at Biarritz when CBM saw the course. But we do know that it wasn't the Chasm Hole.
Sven