Since EM1 affects FD, there will be one edge in U and one in D that cannot be settled by EM1. Solve them simultaneously as follows Your browser doesnt understand the tag. Move the edge required at FD to UF (using some form of EM1B), and the edge required at UF to BR using Mn; then EM1BR will capture BR into UF, while at the same time moving UF to FD. This assumes that at least one of the two required pieces is in the M slice. It does not work if FD and UF are occupying each others location. In that case, we consider it as an edge exchange (FD,FU) and settle them later.