3x3 across edge switch

[robosariobo777]

On a 3x3, sometimes if pieces are flipped/ switched before a scramble, when the cube is supposed to be solved, two edges that are across from each other are in the wrong spots..I have searched the wiki, but havent found an algorithm that can switch them

 

[riffz]

Two edges can be flipped in place but you can't just swap 2 edges. I suggest you take your cube apart and put it back together properly.

 

[robosariobo777]

yes. thats what i usually do, but yet i have heard there is some long algorithm that will do it

 

[jiggy]

That's because there isn't one. On a normal 3x3 it's impossible to permute only 2 edges. You will only come across this if someone has taken an edge out and replaced it in the incorrect orientation, or something similar.

If you're interested in cube laws and cube theory, I suggest you check out Ryan Heise's site.

EDIT: To make things really easy for you, read this:
http://www.ryanheise.com/cube/cube_laws.html

 

[gibbleking]

what made you ask...?

 

[robosariobo777]

cuz if i have a pop, then i come across this..

 

[riffz]

cuz if i have a pop, then i come across this..

Just means you put it back together wrong.

 

[radmin]

Could it happen on a voidcube? Just wondering, I don't have one.

 

[cuber952]

Could it happen on a voidcube? Just wondering, I don't have one.

Yes it could happen on a void cube. It would be parity

 

[CubesOfTheWorld]

You must have 3x3 and 4x4 mixed up. On 3x3, you cannot swap 2 edges. On 4x4, there are two types of parity: One edge flipped and two edges switched. It takes a long algorithm to flip one edge. That is what you are getting mixed up here. There is a long algorithm to fix the other parity on 4x4. You cannot switch two edges on a 3x3 unless you take pieces out and put them in different places.

I hope I wasn't too confusing

EDIT: You can swap two edges on a 3x3, but it has to be a void cube.

 

[riffz]

I'm pretty sure he doesn't have 3x3 and 4x4 confused.

 

[VP7]

It takes a long algorithm to flip one edge.

You can not flip one edge. The number of edges has to be even numbered.

3x3: M U' M U' M U2 M' U' M' U' M' U2
4x4 and higher: r2 B2 U2 l U2 r’ U2 r U2 F2 r F2 l’ B2 r2

 

[Ranzha]

It takes a long algorithm to flip one edge.

You can not flip one edge. The number of edges has to be even numbered.

However, on 4x4, two paired wing edges becomes a dedge, which for 3x3 stage becomes one unit, and thusly an edge.

 

[VP7]

There is one other possibility. If this persons cube has 2 adjacent
faces the same color. Then that edge would have two stickers of the
same color, thus if this edge and one other is flipped it would appear
as only one edge is flipped.

 

[cincyaviation]

It takes a long algorithm to flip one edge.

You can not flip one edge. The number of edges has to be even numbered.

3x3: M U' M U' M U2 M' U' M' U' M' U2
4x4 and higher: r2 B2 U2 l U2 r’ U2 r U2 F2 r F2 l’ B2 r2

he is talking about a dedge on 4x4...
Stop taking everything into technicalities.
As for your non quoted post above mine, he isn't tlking about flipped edges, just switched.

 

[irontwig]

4x4 and higher: r2 B2 U2 l U2 r’ U2 r U2 F2 r F2 l’ B2 r2

You can't flip edges on even cubes, just permute.

 

[Chapuunka]

4x4 and higher: r2 B2 U2 l U2 r’ U2 r U2 F2 r F2 l’ B2 r2

You can't flip edges on even cubes, just permute.

Technically you're permuting them, but in the process they have to also be flipped over.

 

[shelley]

Could it happen on a voidcube? Just wondering, I don't have one.

Yes it could happen on a void cube. It would be parity

To clarify: the position is a legal state on a void cube and can be resolved without taking the cube apart. This is not the case on the normal 3x3.

 

[jiggy]

Could it happen on a voidcube? Just wondering, I don't have one.

Yes it could happen on a void cube. It would be parity

To clarify: the position is a legal state on a void cube and can be resolved without taking the cube apart. This is not the case on the normal 3x3.

Yes indeed, it would look something like this on a 3x3:

Spoiler

Linkey

EDIT: (Ooo! 200 posts.)