Click to enlarge photos. The guide book describes the two routes in the following way. The Y (the cleft to the left is often green) and Z (the slightly less-green crack is overhung at it its base).
I suspect most people avoid these routes as they tend to look horrible and there are classics close by. I am pleased to stay that Rick had no such qualms and sent me up the Y crack and led the Z crack himself. I am annoyed to find that my guide book suggests that the Y crack is graded at HS 4b. It felt a lot harder to me than that and a lot better than it looks.