a separate second green on a hole, perhaps used for maintenance reasons or just to provide a "different" hole on each hole of a 9-hole course, so it can seem like an 18-hole course E [..]

A second putting green for one hole, which offers the golfer another option, is called alternate green. So in fact at holes with an alternate green the player can decide which one he likes better for his game. The two greens always differ themselves in some details. The opportunity of an alternate green is often used for 9-hole courses, because gol [..]