What I saw during practice rounds on Bethpage seemed pretty consistent - easy being, for example, front on 1, 8 and 18, middle on 4, 7 and 13, and back right on 15, and hard being back right on 8, front left on 15, and tucked away on the right of such holes as 4, 7, 13 and 18. Since there only seem to be two pin placements on most or all of the holes, medium must be a random combination of easy and hard.