PA's 50 CLASSIC BOULDERS - note this reads boulders, not boulder problems.

A 50 classic boulder is something I'd like to have in my back yard.

Stiff Upper Lip boulder - three ultra classics: Stiff upper lip, Cats in heat, and Ambrosia tackle the overhanging face and involve throws to the very technical lip. The left end of the boulder is shorter and looks easy but the routes there are actually quite stiff as well.