When solving a 4x4 cube you have specific notation to inner and outer lines, like
R = Clockwise outer right and
r = Clockwise inner right. If you want to turn both, the two letter must be combined like
(Rr)2. To solve OLL parity I could use the following algorithm:
Image linked from speedcubing.com
r2 B2 U2 l U2 r' U2 r U2 F2 r F2 l' B2 r2
r2 means "turn inner right 2 times clockwise", why some sites uses
- Open Alg Cubing
- Select 4x4 cube
- Inside the Moves field, type
- Play. It will turn both right columns.
- This site uses the notation
rto define "both layers(outer and inner)".
- However, this site uses the notation
Rrto define "both layers"
My question: What is the official notation to 4x4 movements(if any exists)?