Daily F2L Discussion - Case 11

Case 11

Setup: R U R2 U R2 U2 R' y

Most important solution: y' R U2 R2 U' R2 U' R'

Angles: Easy from FL + BR. Harder from FR + BL.

Mirror: Case 12

Discussion of Case 11:

This is a good example of an F2L case that many perform inefficiently. The natural tendency is to use an algorithm such as U' R U2 R' U y L' U' L. Intuitively, U' R hides the corner, U2 repositions the edge, and R' unhides the corner. You're now left with case 3, which can be solved with U y L' U' L.

Although this solution isn't bad, it isn't ideal, as it utilizes a cube rotation in the middle of the algorithm. If you were to get this case from the FL, for instance, then your solution would involve a total of 2 cube rotations. As mentioned in previous F2L discussion threads, you should never have to do 2 cube rotations to solve a single F2L case.

A much better solution is y' R U2 R2 U' R2 U' R'. The first move (y') places the empty slot in the BR, which is ideal for this case. R hides the corner, and U2 repositions the edge. R2 U' R inserts the pair into the back. Note, however, that we've accidentally broken up the pair in the FR. Luckily for us, it can be easily reinserted using R U' R'. In the final algorithm, the two "R" moves combine to form R2. At worst, this case can be solved with a 7 move rotationless algorithm.

Of course, if you don't have a solved pair in the FR position, then the last 2 moves are unnecessary. In this case, you can simply use y' R U2 R2 U' R.

This case is equally well-behaved from the BR. For the other two angles, it's best to do a single cube rotation (y or y') in the beginning of the algorithm and solve it into the FL or BR positions.

Algorithms

[Front Right (FR)](http://cube.crider.co.uk/visualcube.php?fmt=png&size=200&stage=f2l&case=U' R U2 R' U F' U' F.png)

y' + {BR}

y + {FL}

[Back Left (BL)](http://cube.crider.co.uk/visualcube.php?fmt=png&size=200&stage=f2l&case=y2U' R U2 R' U F' U' F.png)

y + {BR}

y' + {FL}

[Front Left (FL)](http://cube.crider.co.uk/visualcube.php?fmt=png&size=200&stage=f2l&case=y'U' R U2 R' U F' U' F.png)

L U2 L2 U' L2 U' L'

L U2 L2 U' L (Empty BL slot)

L' U L U' L' U L U2 L' U L

[Back right (BR)](http://cube.crider.co.uk/visualcube.php?fmt=png&size=200&stage=f2l&case=yU' R U2 R' U F' U' F.png)

R U2 R2 U' R2 U' R'

R U2 R2 U' R (empty FR slot)

R' U R U' R' U R U2 R' U R

Please feel free to add the discussion by posting your personal tips, tricks, or algorithms that have not been documented. If you spot an error, please let me know ASAP so it can be corrected for the benefit of the subreddit.

Contributors

oyoat

jimvibe

Previous Daily F2L Discussions

1 2 3 [4] (https://www.reddit.com/r/Cubers/comments/42esto/daily_f2l_discussion_case_4/) 5 6 [7] (https://www.reddit.com/r/Cubers/comments/43fpd6/daily_f2l_discussion_case_7/) 8 9 10 11