Algorithms › OLL

OLL 20

The algorithm, how to recognise it and how to practise it without cheating.

Probability1/216

Moves13

TypeDot

Inverse and mirror—

Recommended algorithm

r U R' U' M2 U R U' R' U' M'

13 moves

How to recognise it

Only the centre and the four corners are yellow on top, an X with no edges. Any angle works.

Practise 20 now

Random-state scrambles, a timer and spaced review. Free, on the web and on your phone.

Other cases: Dot

1R U2 R2 F R F' U2 R' F R F'Dot · 1/108 2F R U R' U' F' f R U R' U' f'Dot · 1/54 3f R U R' U' f' U' F R U R' U' F'Dot · 1/54 4f R U R' U' f' U F R U R' U' F'Dot · 1/54 17R U R' U R' F R F' U2 R' F R F'Dot · 1/54 18r U R' U R U2 r2 U' R U' R' U2 rDot · 1/54 19r' R U R U R' U' M' R' F R F'Dot · 1/54