9 extra holes or if you like half a round at about 4,200 yards. Double that up and assume same scores in the back nine then Jacquelin scored 4 under on a 8,400 yard course and Keiffer 2 under. Kind of proves just adding length isn't the answer.
BTW watching Jaquelin play his approach shots to the 18th was fantastic, watching him putt not so fantastic.
Niall