(looks like an impossible PLL): This is a center misalignment issue – rotate the center 90° using the above algorithm and re-solve the last layer edges.
Remember that the "edges" of a 3x3 are the "centers" of a Fisher Cube. If you'd like, I can: Create a step-by-step visual guide for the parity cases. Provide a printable PDF format version of these algorithms. Explain how to fix the side centers specifically. fisher cube algorithms pdf
The Fisher Cube is a 3×3 shape-mod. are on edges, edges are like corners, and corners are like edges. Use standard 3×3 algorithms but watch for parity and orientation issues . (looks like an impossible PLL): This is a
(When typesetting to PDF, list algorithms in a table with columns: Name, Algorithm, Effect, Setup/Notes.) edges are like corners