3x3 CMLL U X algorithm

Solve the four upper corners in Roux after building both side blocks; the remaining edges are solved later.

U X belongs to the U group in CMLL.

Recognize this starting position

In the inverse-derived training position, the upper-face color points upward at these corner positions: UFR, UFL. Upper edges with that color facing up: UF, UL. Reading each side’s upper corner stickers left to right when facing that side gives F: R L; R: F B; B: U U; L: B F. The letters identify colors by their reference faces.

Execute the algorithm

U2 Rw U' Rw' U Rw' D' Rw U' Rw' D Rw

The opening is U2 Rw U'; the final segment is Rw' D Rw. This version contains 12 face, wide, or slice turns and no whole-puzzle rotations.