3x3 · ZBLL
3x3 ZBLL Pi 4 algorithm
3x3 ZBLL Pi 4 algorithm: 15 turns, opening with y2 R U. Case recognition, the complete sequence, and practical execution notes.
Solve the entire last layer in one sequence when its edges are already oriented.
ZBLL Pi 4 belongs to the Pi 1 group in ZBLL.
Recognize this starting position
In the inverse-derived training position, the upper-face color points upward at these corner positions: none. Upper edges with that color facing up: UF, UL, UB, UR. Reading each side’s top row left to right when facing that side gives F: B F U; R: F L F; B: U R B; L: U B U. The letters identify colors by their reference faces.
Execute the algorithm
y2 R U R D R' U' R D' R U' R U' R' U2 R
The opening is y2 R U; the final segment is R' U2 R. This version contains 15 face, wide, or slice turns and 1 whole-puzzle rotation.