OLL 19
The algorithm, how to recognise it and how to practise it without cheating.
Probability1/54
Moves13
TypeDot
Inverse and mirror—
Recommended algorithm
r' R U R U R' U' M' R' F R F'13 moves
Alternatives
M U R U R' U' M' R' F R F'13 moves
How to recognise it
A dot with two adjacent corners yellow on top. Hold them at the back: the front corners' yellow faces left and right.
Its inverse is another case
Do the 19 algorithm backwards, F R' F' R M U R U' R' U' R' r, and you are solving 17.
That's why CubeDojo never scrambles 19 that way: it builds a random state with the case fixed, so you practise 19 and not 17.
Practise 19 now
Random-state scrambles, a timer and spaced review. Free, on the web and on your phone.