Solve the corners using move 4, which flips 3 corners but leaves the top-left-front
corner alone. Itīs the key to setting up the move, so letīs call it the NC (no change) corner.
There are three cases.
- If no corners are solved (fig. A), start move 4 with the top color on the left face of
the NC corner. To remember, think "none left".
- If 1 corner is solved (fig. B), start the move with the solved corner in the NC position. Logical, no?
- If 2 corners are solved, put a bad corner in the NC corner with the top color towards the front (fig. C). Think "too forward."