F2L · Connected on top

F2L 15

F'
U
F
U2
R
U
R'
How to recognise it
Corner above the slot with white facing you; the edge is beside it in front and their top colours match.
Algorithms
Relations
Mirror
F2L 16
Your algorithm backwards
R U' R' U2 F' U' F
solves F2L 16
That's why your scrambles are never the inverse of the algorithm: you'd be practising F2L 16 without knowing it. CubeDojo builds a random state with this case and checks it comes out.
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