Ab permutation algorithm
PLL (permute the last layer). Group: Corners only.
Ab permutation: the top face is yellow all over. The algorithm moves the front-left corner piece to the front-right corner, and moves the back-left corner piece to the front-left corner, and moves the front-right corner piece to the back-left corner.
The diagram shows the cube from above with the front at the bottom and yellow on top.
Algorithm
R' D R U2 R' D' R U R' D R U R' D' R
15 moves.
Other algorithms
R' B' R U' R D R' U R D' R2 B Rx R2 D2 R U R' D2 R U' R x'y x' R U' R D2 R' U R D2 R2 x
Source: www.speedsolving.com