2x2 CLL U 4 algorithm

Solve the final four corners of the 2x2 after completing the first layer.

CLL U 4 belongs to the U group in CLL.

Recognize this starting position

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

Execute the algorithm

y' F R' F' R U' R U' R' U2 R U' R'

The opening is y' F R'; the final segment is R U' R'. This version contains 12 face, wide, or slice turns and 1 whole-puzzle rotation.