Pons Asinorum pattern: moves for a 3x3 cube
The top and bottom stay solved. Each side face has its own center inside a ring of the color of the face opposite it.
Also known as Four centers swap.
Moves
F2 B2 U D' R2 L2 U D'
8 moves, starting from a solved 3x3 cube.
Source: www.cubelelo.com