PLL Parity (4×4): Both last-layer edge pairs on one axis are swapped with the pair opposite them. The corners look shuffled here — that is a free U2, and the algorithm ignores it.

PLL Parity (4×4)

Both last-layer edge pairs on one axis are swapped with the pair opposite them. The corners look shuffled here — that is a free U2, and the algorithm ignores it.

4×4 parity4×4

Algorithm

2R2 U2 2R2 Uw2 2R2 Uw2

PLL Parity (4×4) case diagram — The replay starts at the case and solves it — step through it, or drag to rotate.