Four cases with two neighboring edges flipped: flip only, or two pairs swap.
Goal
The first two layers and the four top corners are done. Two neighboring edges are flipped, and the edges are all home or swap in two pairs. One algorithm solves the cube.
How to recognize it
Words used here:
- : a top edge whose yellow sticker faces a side. Its color is the sticker facing up.
- : the edge has the color of the center of the side it sits on. A flipped edge can still be home.
- : the center on the far side of the cube (front and back, left and right).
Count the flipped edges and see where they are. Then find the edges that are home. If only one edge stays put, see which center's color the back or right edge has.
How to hold the cube
White on the bottom, with the top corners lined up with the centers. Every case is seen from this grip; the recognition text names positions as the cube starts.
The main idea
Flip only is the easiest to miss: every side matches, only two yellow stickers face out.
Final check
The whole cube is solved. Turn U once more if the top is still offset.
Next lesson
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