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L to R R to L Alpha
A pretty good route if you climb it so as to avoid some lichen and loose rock, but not quite as direct that way.
Arrive at the Upper South face of the 3rd Flatiron in the vicinity of the S.W. Chimney and S. Chimney. Just downhill from the SW chimney, perhaps 50 meters and just 15 meters right of the pocketed dihedral that is the start of the South Chimney, there is a shallow, blocky, left-facing dihedral starting at the ground and rising up over a lower angle section to a right-facing steep corner. This is the start of Inner Sanctum. Just right of this is the offset overhanging seam and flake start to "Thin Crack."
A standard light rack to 3"