OLL · Fish

OLL 9

R
U
R'
U'
R'
F
R2
U
R'
U'
F'
How to recognise it
A fish: the back and left edges with the front-right corner. The front-left corner's yellow faces you.
Algorithms
Relations
Mirror
OLL 10
Your algorithm backwards
F U R U' R2 F' R U R U' R'
solves OLL 13
That's why your scrambles are never the inverse of the algorithm: you'd be practising OLL 13 without knowing it. CubeDojo builds a random state with this case and checks it comes out.
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