F2L 12
The algorithm, how to recognise it and how to practise it without cheating.
Recommended algorithm
R' U2 R2 U R2 U R7 moves · R and U only
Alternatives
U F' U2 F U' R U R'8 moves
How to recognise it
Corner above the slot with white facing right; the edge is beside it in front but not paired: its top colour is that of the corner's front sticker.
Its inverse is another case
Do the 12 algorithm backwards, R' U' R2 U' R2 U2 R, and you are solving 1.
That's why CubeDojo never scrambles 12 that way: it builds a random state with the case fixed, so you practise 12 and not 1.
Practise 12 now
Random-state scrambles, a timer and spaced review. Free, on the web and on your phone.
Other cases: Connected on top
11
U' R U2 R' U F' U' FConnected on top · 1/3813R U R2 F R F2 U' FConnected on top · 1/3814U' R U' R' U R U R'Connected on top · 1/3815F' U F U2 R U R'Connected on top · 1/3816R U' R' U2 F' U' FConnected on top · 1/3817R U2 R' U' R U R'Connected on top · 1/3818F' U2 F U F' U' FConnected on top · 1/3823U2 R2 U2 R' U' R U' R2Connected on top · 1/3824F U R U' R' F' R U' R'Connected on top · 1/38