F2L · Separated on top

F2L 20

U'
F'
U2
F2
R'
F'
R
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.
Algorithms
Relations
Mirror
F2L 19
Your algorithm backwards
R' F R F2 U2 F U
solves F2L 2
That's why your scrambles are never the inverse of the algorithm: you'd be practising F2L 2 without knowing it. CubeDojo builds a random state with this case and checks it comes out.
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