2x2 CLL Pi 2 algorithm

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

CLL Pi 2 belongs to the Pi group in CLL.

Recognize this starting position

In the inverse-derived training position, the upper-face color points upward at these corner positions: none. Reading each side’s upper corner stickers left to right when facing that side gives F: R U; R: F L; B: U F; L: U U. The letters identify colors by their reference faces.

Execute the algorithm

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

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