3x3 · PLL
3x3 PLL Ub algorithm
3x3 PLL Ub algorithm: 7 turns, opening with y2 M2 U'. Case recognition, the complete sequence, and practical execution notes.
Permute the last-layer pieces while preserving their orientation and the first two layers.
Ub belongs to the EPLL 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: F F F; R: R L R; B: B R B; L: L B L. The letters identify colors by their reference faces. Piece locations (position ← home piece): UL ← UB, UB ← UR, UR ← UL.
Execute the algorithm
y2 M2 U' M U2 M' U' M2
The opening is y2 M2 U'; the final segment is M' U' M2. This version contains 7 face, wide, or slice turns and 1 whole-puzzle rotation.