OLL 55
The algorithm, how to recognise it and how to practise it without cheating.
Probability1/108
Moves15
TypeLines
Inverse and mirror—
Recommended algorithm
R' F R U R U' R2 F' R2 U' R' U R U R'15 moves
Alternatives
(U) R U2 R2 U' R U' R' U2 F R F'11 moves
How to recognise it
Only the left and right edges are yellow on top, with full bars on the front and back sides.
Its inverse is another case
Do the 55 algorithm backwards, R U' R' U' R U R2 F R2 U R' U' R' F' R, and you are solving 54.
That's why CubeDojo never scrambles 55 that way: it builds a random state with the case fixed, so you practise 55 and not 54.
Practise 55 now
Random-state scrambles, a timer and spaced review. Free, on the web and on your phone.