3x3 · OLL
3x3 OLL 21 algorithm
3x3 OLL 21 algorithm: 11 turns, opening with R U R'. Case recognition, the complete sequence, and practical execution notes.
Orient the last layer after completing F2L; permutation is handled in the next stage.
OLL 21 belongs to the OCLL group in OLL.
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.
Execute the algorithm
R U R' U R U' R' U R U2 R'
The opening is R U R'; the final segment is R U2 R'. This version contains 11 face, wide, or slice turns and no whole-puzzle rotations.