OLL 21 · H
The algorithm, how to recognise it and how to practise it without cheating.
Probability1/108
Moves11
TypeOCLL
Inverse and mirror—
Recommended algorithm
R U2 R' U' R U R' U' R U' R'11 moves · R and U only
Alternatives
(U) R U R' U R U' R' U R U2 R'11 moves · R and U only
How to recognise it
No corner shows yellow on top, and there are two pairs of headlights. Hold them front and back.
Practise 21 · H now
Random-state scrambles, a timer and spaced review. Free, on the web and on your phone.