This classic S 4b follows an inside corner/hand crack in the April Crack wall. Starting on a steep undercling flake, power your way diagonally up and right to a small ledge. Continue up the crack utilizing excellent hand jams until another ledge is reached. Protect well and jam your way through the crux bulge (tricky footwork). Top out easily through a chimney groove or just left on the face (recommended).
Just left of Rusty Wall and the obvious dihedral of Green Crack, but right of Christmas Crack. Small, V-shaped corner with a hand crack in it.
Good nuts (too good, ate one of mine!) or hand-sized cams.