2x2 EG1 Pi 4 algorithm

Solve the remaining 2x2 corners when the completed first face has an adjacent swap in its layer.

EG1 Pi 4 belongs to the Pi group in EG 1.

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: F U; R: B B; B: U F; L: U U. The letters identify colors by their reference faces.

Execute the algorithm

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

The opening is y' R U'; the final segment is R U' R'. This version contains 11 face, wide, or slice turns and 1 whole-puzzle rotation.