3x3 · PLL
3x3 PLL Na algorithm
3x3 PLL Na algorithm: 21 turns, opening with R U R'. Case recognition, the complete sequence, and practical execution notes.
Permute the last-layer pieces while preserving their orientation and the first two layers.
Na belongs to the Opp Swap group in PLL.
Recognize this starting position
In the inverse-derived training position, the upper-face color points upward at these corner positions: UFR, UFL, UBL, UBR. 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 F; R: R L L; B: F B B; L: L R R. The letters identify colors by their reference faces. Piece locations (position ← home piece): UFL ← UBR, UBR ← UFL, UL ← UR, UR ← UL.
Execute the algorithm
R U R' U R U R' F' R U R' U' R' F R2 U' R' U2 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.