Note: older instructions tell 1c to turn once LH on 23-24; the current (revised) instructions leave that unspecified.
Note on [27-28]: originally 2 PdB. modified by Drewry to SkCh. O. Otto says best variant is corners in PdB, 1c in SkCh
note: on bar 12 M face M, W face W
Note: Cosh explicitly tells 1c to pass Lsh in [9-24]; however the Rsh pass is quite common, and nicknamed »Mairi's Divorce«.