F2L 20
The algorithm, how to recognise it and how to practise it without cheating.
Recommended algorithm
U' F' U2 F2 R' F' R7 moves
Alternatives
U' F' U2 F U' F' U F8 movesU' F' U2 F U2 F' U2 F8 moves
How to recognise it
White on top, corner above the slot; the edge is on the left, its top colour matching the corner's front sticker.
Its inverse is another case
Do the 20 algorithm backwards, R' F R F2 U2 F U, and you are solving 2.
That's why CubeDojo never scrambles 20 that way: it builds a random state with the case fixed, so you practise 20 and not 2.
Practise 20 now
Random-state scrambles, a timer and spaced review. Free, on the web and on your phone.
Other cases: Separated on top
5
U' R U R' U2 R U' R'Separated on top · 1/386R' U' R F R' F' U RSeparated on top · 1/387U' R U2 R' U2 R U' R'Separated on top · 1/388R2 U2 F R2 F' U2 R2Separated on top · 1/389U' R U' R' U F' U' FSeparated on top · 1/3810U' R U R' U R U R'Separated on top · 1/3819U R U2 R' U R U' R'Separated on top · 1/3821R U' R' U2 R U R'Separated on top · 1/3822U2 R U R' F' U' FSeparated on top · 1/38