Route 20 is an excellent route to help develop solid jamming skills.
Start in a dihedral split by a nice wide-hands crack. The crack is an tough size to jam for most, but this section is made much easier with help of other, more friendly, features and good feet. Awkwardly clamber over the huge wedged block to gain a excellent rest. The next section, a steep, left-leaning hand crack with poor feet, presents the crux. Follow this strenuous crack to the top.
Right of Route 19, which is just north/east (i.e. climber's right) of the downclimb.
Route 20 climbs the cracks below a huge, imposing block. Above the block is a platform with a wide crack on the right, and a left-leaning hand crack on the left. The route finishes with the hand crack.
Well protected. Bring a standard rack of nuts and cams to a #3 camalot. Doubles on hand-sized pieces (e.g. #1 and #2 camalot) would not go unused. You will need to build a gear anchor at the top.