M U (R U R’ U’) M’ (R’ F R F’) (triangle figure on the far side of U-face)
M’ U’ (R’ U’ R U) M (R B’ R’ B) (triangle figure on the near side of U-face)
The second one is the upper and lower symmetry of the first one. The backside
Sledgehammer (R B’ R’ B) may be a little tricky at first, especially the last “B” turn, but not so difficult after some practice.
You can make it, putting your right index finger on UR edge piece to avoid S-slice move and turning B-face by your left middle, ring and pinky fingers. The tip is to move the B-face by pinky finger, pushing the left side of it.
Exciting Rubik’s cube 