only like the best oll ever....it is most used for rotating 3 corners in the same direction. since it just uses 2 layers it preserves corner permutation, and also cycles edges. (R U R' U, R U2 R').....I use it forward, backwards, upside down and mirrored, whatever is most convenient at the time because it is so simple. Also through in a R' U' R U after the comma to make it a double sune.