Is it a good way to scramble the cube, or something I don't get ?(Rr)' U R U
[(Rr)' U2] * 3
(Rr)2 U R' U' (Rr)2
U' R' U (Rr)'
This alg is awesome. Finally I have an excuse to use Petrus for speedsolving the 4x4x4.
EDIT: OK, say no more, I get it. But how the hell did you find this alg ?