M’ U (R’ U’ R U’ R’ U2′ R) U M (vertical lightning shape & a block on R-face)
M U’ (R’ U’ R U’ R’ U2′ R) U’ M’ (vertical lightning shape & a block on L-face)
These algorithms are similar to the OLL11. They use Back Sune instead of Sune.
It is easy to avoid confusion which to use, M U’ or M’ U, Sune or Back Sune when you encounter OLL11 or OLL12. Just enough to memorize the following tip.
1) which direction to turn first, M U’ or M’ U? -> toward the colored edge of Lightning.
2) which Sune pattern? -> if Lightning is striking to the right side, use Sune, if at the contrary, use Back Sune.
Exciting Rubik’s cube 