Swap one piece
Step 1 / 4
R': Right face: turn 90°, front face goes down
The front has a red piece in its top right spot. The right has a blue piece in its top left spot.
Yellow on top, the red piece in the top right spot of the front. The algorithm swaps the two pieces through the lower slices.
Step 1 of 4: R'. Right face: turn 90°, front face goes down