Right center off
Step 1 / 3
Rw: Everything except the left corner: turns counterclockwise (looking at the left corner)
The top and back centers are right; the right corner's center is turned.
Rw brings the right center to the top, the top center to the back and the back center to the right. U turns the right center while it is on top. Rw' brings all three back, now all correct.
Step 1 of 3: Rw. Everything except the left corner: turns counterclockwise (looking at the left corner)