Switching Adjacent Cross Edges

[Lucas Garron]

It happens to Fridrich F2L solvers too often. We solve our cross, put it on the bottom, and not until the final pairs dowe notice that some cross edges are out of place.

Normally, it's only two edges. Four is a bit bad, but I it's hard to miss, and the same edges are still opposite, not TOO hard to switch.

Opposite is easy: M2' U2 M2'

I've been wondering if there is a good, intuitive alg for two adjacent edges (say, based on U-perm + opp-switch).

Anyhow, I just found:
R' U2 r2 U R U R2 U2 r2' R
(Not intuitive, but kinda nice.)

Does anyone have any better ideas?

 

[LarsN]

Intuitive but not that nice: M' U2 M U R2 U M' U2 M U R2

I've never had adjant edges happen to me, but opposite happens a lot.

 

[hr.mohr]

Rw2 B2 (z-perm) B2 Rw2

 

[fanwuq]

Rw2 R perm Rw2
UR2U'M2UR2U'M2U2M'U2M
edit: that's the same idea as LarsN's (M2 BLD) just inversed without cancellation.

 

[watermelon]

To swap DF and DL, I usually use M' y' M' U M y U2 M. It's 100% intuitive and fairly fast as well.

To swap DF and DR, you could either do a rotation first then use the algorithm above, or use the mirror, M' y M' U' M y' U2 M.

 

[brunson]

That's really fun to do, Mitchell. I'm trying to finger trick it with DU', D'U' instead of y', y. (I think I got that right).

 

[Werner]

z' R U R' U' R U R' z

Kinda long but really fast.

 

[watermelon]

Werner, this topic is about swapping adjacent cross edges without disturbing the already-solved F2L pairs.

For swapping adjacent cross edges right after making the cross, I'd suggest a slightly shorter alternative: z' U' R U R' U' z.

 

[Truncator]

M' U M U' y M' U' M y' M' U'

Something like that. Intuitive, but slow.