F2L 28
The algorithm, how to recognise it and how to practise it without cheating.
Recommended algorithm
R U2 R' F' U2 F6 moves
Alternatives
F' U F2 R' F' R6 movesR U R' U F' U2 F7 movesR U R' U2 F' U F7 moves
How to recognise it
Corner in the slot with white facing right; the edge is at the front of the top layer, its front sticker matching the front centre.
Its inverse is another case
Do the 28 algorithm backwards, F' U2 F R U2 R', and you are solving 27.
That's why CubeDojo never scrambles 28 that way: it builds a random state with the case fixed, so you practise 28 and not 27.
Practise 28 now
Random-state scrambles, a timer and spaced review. Free, on the web and on your phone.