3x3 · ZBLL
3x3 ZBLL H 40 algorithm
3x3 ZBLL H 40 algorithm: 21 turns, opening with R U R'. Case recognition, the complete sequence, and practical execution notes.
Solve the entire last layer in one sequence when its edges are already oriented.
ZBLL H 40 belongs to the H4 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: R B L; R: U L U; B: L F R; L: U R U. The letters identify colors by their reference faces.
Execute the algorithm
R U R' U R U' R' U R U' R' U R' U' R2 U' R' U R' U R
The opening is R U R'; the final segment is R' U R. This version contains 21 face, wide, or slice turns and no whole-puzzle rotations.