3x3 · EO 4a
3x3 EO 4a Bottom 2 algorithm
3x3 EO 4a Bottom 2 algorithm: 7 turns, opening with M' U' M'. Case recognition, the complete sequence, and practical execution notes.
Orient the remaining edges in the Roux last-six-edges stage after solving the blocks and corners.
Recognize this starting position
In the inverse-derived training position, the upper-face color points upward at these corner positions: none. Upper edges with that color facing up: UL, UB.
Execute the algorithm
M' U' M' U M U' M'
The opening is M' U' M'; the final segment is M U' M'. This version contains 7 face, wide, or slice turns and no whole-puzzle rotations.