On 2nd chord 3c+4c change sides to 1,2,3x,4x. Centro-symmetrical dance.
Note: This crib follows the current way of dancing. In the original instructions, the promenade [25-32] is cclw. Bill Hamilton said in 'hindsight' this promenade should be clw, but preferred not to change the official instructions. Bill disapproved of another variant, where the circle [121-128] is continued to the R only.
Note: Cosh explicitly tells 1c to pass Lsh in [9-24]; however the Rsh pass is quite common, and nicknamed »Mairi's Divorce«.