Swapped Centers

[4Chan]

When I'm doing 4x4, and I'm done with reduction and i go on to solve 3x3, andsometimes i find that i have misplaced 2 centers such as putting red to the right of yellow, but with green on the bottom.
The way that i do centers is like this: first 2 opposite centers, next 2 opposite, last 2 opposite. Usually in the order of green/blue, red/orange, then yellow/white.

Does anyone know the Alg to switch 2 centers that are across from eachother?

 

[blah]

First of all, you shouldn't do 'next 2 opposite, last 2 opposite' at all! Unless you were 'forced' into it, meaning you got lucky/unlucky and the opposite center got solved when you were solving the third center (technically, you skipped a step, but is that really lucky?) .

You should be doing 'first 2 opposite, next 2 adjacent, last 2 adjacent', primary reason being it's not fun to tilt such a big (?) cube back and forth just to see which pieces need to be swapped, and I don't even know if there's a secondary reason (probably because quarter-turns are *slightly* faster than half-turns?) There is an algorithm that switches 2 opposite centers (and it doesn't even affect the paired-ness of the edges at all, so you can still do it even if you realized you had the centers wrong after edge-pairing! ), and it's very intuitive: r2 U2 D2 r2'.

Edit: Actually, personally, I use Pochmann centers (which is about 10 secs faster than 'traditional' center solving, for me), but I think I've read enough material on 'traditional' center solving to know that the last 2 centers should be adjacent and not opposite. P/S: I've read so much material, but just didn't get faster so I switched to Pochmann and instantly got a sub-25 average for centers on my first try Try it.

 

[4Chan]

Ah, thanks, ill keep that in mind!

 

[Kenneth]

Rr2 uu2 Rr2 (double layer turns) swaps U/D centres ... Eh, forget that, dunno why I wrote those turns

Do Uu2 M2 Uu2 instead =)

Rr U2 Rr' Ll' U2 Ll swaps U/F centres

 

[PatrickJameson]

I do r2 U2 D2 r2 which switches the U/D centers. It also preserves the cross if you put the cross on the F face.

 

[masterofthebass]

I do r2 U2 D2 r2 which switches the U/D centers. It also preserves the cross if you put the cross on the F face.

And who showed you that alg

 

[Derrick Eide17]

I do r2 U2 D2 r2 which switches the U/D centers. It also preserves the cross if you put the cross on the F face.

And who showed you that alg

Um..... santa?

 

[rjohnson_8ball]

r2 (ud)2 r2 (ud)2 swaps two opposite faces and keeps all edges in place.

Even though swapping the 2 centers after solving double edges is not too hard, I prefer to get them correct beforehand. I confirm that Red-White-Blue cycle in the clockwise direction when I look at the corner where they meet. If they cycle counter-clockwise, I swap a pair of opposite centers using r2 U2 D2 r2 as suggested earlier. (Side trivia: proper dice should cycle 1-2-3 when you look at the corresponding corner.)

 

[PatrickJameson]

I do r2 U2 D2 r2 which switches the U/D centers. It also preserves the cross if you put the cross on the F face.

And who showed you that alg

thanks again