cuBerBruce
Member
I note that all except for 2 of the 4-flip OLL cases can be solved optimally (face-turn metric) by that type of alg: 5-move setup, 1 turn, 5-move undo setup. For example, (R B2 R2 U2 R) B (R' U2 R2 B2 R'). The all corners oriented case is 12f*, so it is obviously one of the 2 exceptions. The other exception is OLL 19 in the Wiki.Looking back on the solution, [B' U' D B D' F D B' D' U B] is interesting, 5 moves setup + F + inverse 5 moves.