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One-Answer 4x4 Question Thread

caters

Member
Joined
Nov 8, 2013
Messages
48
So, I have gotten to the point where I am almost done with the 4x4 solve. But, there are 2 edges that need switching. And they aren't the front and back edge switch that I easily find algorithms for, these are diagonal edges. I looked up diagonal edge switch algorithms and immediately got one for 3x3, so, since I am using the reduction method(reducing 4x4 to equivalent 3x3), I thought I would try it and, it messed up the corners. I had one edge in the front and one edge on the left just like in the 3x3 case, but the corners got all messed up when I fixed the edges. And then, when I went back to do the corners again, I still had the diagonal edges. I did the 3x3 diagonal edge switch algorithm 3 times now and have gotten nowhere. This is the 3x3 algorithm I'm talking about:

R U R' U R U2 R' U

That switches front and left edges on a 3x3, so I figured it should work for a 4x4 with the same edges needing swapped. But, I did this algorithm 3 times and it always messes up the corners and then when I correct the corners, I still end up with 2 edges needing to be swapped diagonally. Here is a picture of my cube(which by the way uses the Japanese coloring scheme, so blue is opposite white):

1220191409.jpg
Is there a way to switch diagonal edges on a 4x4 without messing the corners up?
 

icarneiro

Member
Joined
Jul 25, 2019
Messages
140
Location
Brazil
So, I have gotten to the point where I am almost done with the 4x4 solve. But, there are 2 edges that need switching. And they aren't the front and back edge switch that I easily find algorithms for, these are diagonal edges. I looked up diagonal edge switch algorithms and immediately got one for 3x3, so, since I am using the reduction method(reducing 4x4 to equivalent 3x3), I thought I would try it and, it messed up the corners. I had one edge in the front and one edge on the left just like in the 3x3 case, but the corners got all messed up when I fixed the edges. And then, when I went back to do the corners again, I still had the diagonal edges. I did the 3x3 diagonal edge switch algorithm 3 times now and have gotten nowhere. This is the 3x3 algorithm I'm talking about:

R U R' U R U2 R' U

That switches front and left edges on a 3x3, so I figured it should work for a 4x4 with the same edges needing swapped. But, I did this algorithm 3 times and it always messes up the corners and then when I correct the corners, I still end up with 2 edges needing to be swapped diagonally. Here is a picture of my cube(which by the way uses the Japanese coloring scheme, so blue is opposite white):

View attachment 11130
Is there a way to switch diagonal edges on a 4x4 without messing the corners up?
(R U R' U') r2 U2 r2 Uw2 r2 Uw2 (U' R U' R')

(R U R' U') = Sexy move
r2 U2 r2 Uw2 r2 Uw2 = PLL parity
(U' R U' R') = Insert the last pair
 

ThatGuy

Member
Joined
Apr 6, 2009
Messages
625
WCA
2010GUSH01
So, I have gotten to the point where I am almost done with the 4x4 solve. But, there are 2 edges that need switching. And they aren't the front and back edge switch that I easily find algorithms for, these are diagonal edges. I looked up diagonal edge switch algorithms and immediately got one for 3x3, so, since I am using the reduction method(reducing 4x4 to equivalent 3x3), I thought I would try it and, it messed up the corners. I had one edge in the front and one edge on the left just like in the 3x3 case, but the corners got all messed up when I fixed the edges. And then, when I went back to do the corners again, I still had the diagonal edges. I did the 3x3 diagonal edge switch algorithm 3 times now and have gotten nowhere. This is the 3x3 algorithm I'm talking about:

R U R' U R U2 R' U

That switches front and left edges on a 3x3, so I figured it should work for a 4x4 with the same edges needing swapped. But, I did this algorithm 3 times and it always messes up the corners and then when I correct the corners, I still end up with 2 edges needing to be swapped diagonally. Here is a picture of my cube(which by the way uses the Japanese coloring scheme, so blue is opposite white):

View attachment 11130
Is there a way to switch diagonal edges on a 4x4 without messing the corners up?
Basically, you setup your case into the 'front to back' case, do the algorithm (r2 U2 r2 Uw2 r2 Uw2 that icarneiro gave), and then undo the setup you did. Note that you can also just apply the front to back algorithm on your case to get a 3-cycle, which you can just solve with a 3x3 U-perm. Less efficient, but more straightforward.
 

cubeshepherd

Member
Joined
Feb 18, 2018
Messages
2,220
WCA
2016STEE01
That is a condition called centers in the wrong position, however it is curable. All you have to do is either swap the Blue and Green centers or the Red and Orange centers after that fix the F2L pairs and your cube it back to healthy.

If you look at a 3x3 and hold it as you have in the picture you will notice the difference.
 

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