OLL · P shapes

OLL 31

R'
U'
F
U
R
U'
R'
F'
R
How to recognise it
A P shape: the right column and the back edge. The left side shows yellow only on its edge.
Algorithms
Built from
R' U' + OLL 44 + R
Loose moves
R' U'
Case
OLL 44
F U R U' R' F'
Loose moves
R
Relations
Mirror
OLL 32
Your algorithm backwards
R' F R U R' U' F' U R
solves OLL 40
That's why your scrambles are never the inverse of the algorithm: you'd be practising OLL 40 without knowing it. CubeDojo builds a random state with this case and checks it comes out.
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