Tom Doak writes in the Confidential Guide:
"While there are many holes to choose from, one deserves special mention because it was Tillinghast's own personal favorite of his productive career, and is a favorite of mine also. The par-3 7th is known as the "Duel hole" because the canyon in which the green lies was the scene of the last duel in American history near the turn of the century; the short hole which resides there now is perhaps the best "drop-shot" par-3 in all of golf. The long, kidney-shaped green is divided in two by a humpbacked ridge which plays a great part in the strategy, because a shot lighting on its reverse slope can be sent careening into one of the nasty bunkers which guard the back of the green, when the pin is set not far behind the ridge, one must carefully weigh the risk of playing to the back half versus laying up safely on the front projection of the green and putting over the ridge."
One of the very few holes he gave !!! to.