Doug, While the sites search engine is much maligned there are a few tricks to getting into the heart. Such as expanding time frames and words to search for. Then there's the tried and true method of actually going into the bowels of the pages and just searching yourself. Yuck!
In short, the redan is like many golf terms in that when meticulously disecting the resultant hole apparently shows it has different meanings to different people. I'm no expert, but i think the first Redan is somewhere like North Berwick(sp?). It's supposedly inspired by a military entrenchment. Difficult to penetrate, without a perfect plan. Notoriously most redan holes are one shotters, with a green that angles and slopes from front right to back left. The 17th at SH, the seventh at Shinecock are all classified as Redans but to me the one at the fourth at Lawsonia is more in keeping with the real deal. Uphill and long.
Lesson two. Guess what a Nader is?