This is what Ran wrote in his course profile........
Fourth hole, 350 yards; Originally, Dunn laid out an ordinary straight-ish short par four. Then one day, inspired by the Principal's Nose at the sixteenth hole on The Old Course at St. Andrews and without consulting with the Board, Paton placed two bunkers smack in the left middle of the fairway right where drives liked to go. The golfer now had the option to play safe on his tee shot, going left of this bunker complex. However, he then faced a ticklish approach over the left greenside bunker. Conversely, he could elect to drive aggressively between the bunkers and the out of bounds train line and leave himself a straightforward pitch. Paton's bunkers created quite a furor in their day. Tom Simpson, on a stormy day, went out and studied the fourth hole for nearly the entire day, so engrossed was he by the hole's strategic merit. The golf world owes much to that day as Simpson became inspired enough to become a first rate architect in his own right. He left many outstanding designs behind, including Ballybunion, Cruden Bay and Morfontaine. Although Paton's fairway bunkers garner the attention at this most famous of inland holes, note needs to be paid to what he did greenside. His front left bunker combined with the green that runs from front left to back right are essential compliments to the Principal's Nose as without them, the hole wouldn't possess near the same strategic merit.