F2L 7
The algorithm, how to recognise it and how to practise it without cheating.
Recommended algorithm
U' R U2 R' U2 R U' R'8 moves · R and U only
Alternatives
U' R U2 R' U' R U2 R'8 moves · R and U onlyF2 U2 R' F2 R U2 F27 moves
How to recognise it
Corner above the slot with white facing you; the edge is on the left, its top colour matching the corner's top.
Its inverse is another case
Do the 7 algorithm backwards, R U R' U2 R U2 R' U, and you are solving 21.
That's why CubeDojo never scrambles 7 that way: it builds a random state with the case fixed, so you practise 7 and not 21.
Practise 7 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 · 1/388R2 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 · 1/3820U' F' U2 F2 R' F' RSeparated 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