Geoff,
I thought I would copy the info I posted about #13 from the other thread:
As one who was there two years ago when this change was discussed, I can certainly verify that more than usual consideration was given to adding the new tee.
At the time the idea was for a tee that would make the hole play in the 630-660 range depending on how far back the tee box might be put.
The reason for doing this is because of the distance gains due to equipment improvements then and since. Actually this brings in more strategy and choices.
Consider, even at 660, the biggest hitters can give the green a run intwo, especially because the cross-bunker is some 40 yards short of the green.
For those that aren't the longest, or those whose drives will find the rough, the bunker on the left side of the fairway will now definitely be in play as it is about the 480-510 mark from the tee. Also, the choice of where to lay-up on the second shot becomes far more strategic as the fairway between the left bunker and the cross-bunker will be fairly narrow and take a well-struck shot to land there, yet a slightly strong or mis-placed shot will find the cross-bunker, a more likely result of the new tee box.
All of this makes the tee shot on this hole far more critical.
The irony in all of this is that not a single eagle was recorded on 13 or 4 during the 2002 Open by anyone reaching either green in two. The handful of eagles came from a 3rd shot pitch-in.
Joe, there may be one ore two more changes coming, though these will be more subtle and hopefully bring more strategy into play as well.