2x2 CLL Pi 1 algorithm

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

CLL Pi 1 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: B U; R: L B; B: U R; L: U U. The letters identify colors by their reference faces.

Execute the algorithm

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

The opening is y F R'; the final segment is R U2 R'. This version contains 12 face, wide, or slice turns and 1 whole-puzzle rotation.