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 Post subject: 4x4 parodyPosted: Mon Dec 19, 2011 5:20 pm

Joined: Sun Dec 18, 2011 3:01 pm
I keep getting a weird parody on the 4x4 that I have no idea how to fix: http://www.youtube.com/watch?v=vfiTVg5oFKE

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 Post subject: Re: 4x4 parodyPosted: Mon Dec 19, 2011 5:26 pm

Joined: Tue Mar 10, 2009 7:06 pm
Location: Nowhere in particular.
Do you know how to fix parity with two opposite edges swapped?

If you do, then you can fix parity using that and use 3x3 algorithms to solve the remainder of the puzzle. If you want a "pure" algorithm, put one of those pairs in front and the other on the left. Then do R U R' U', followed by the algorithm, followed by U R U' R' (The inverse of R U R' U').

Also, the word is "parity." Some people mix the two up.

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 Post subject: Re: 4x4 parodyPosted: Mon Dec 19, 2011 5:30 pm

Joined: Thu Dec 31, 2009 8:54 pm
Location: Bay Area, California
You have a parity in the edge-groups due to the edges being formed in an odd permutation even though the edge wings themselves are in an even permutation.

You can solve it with two 3-cycles:

/* First 3-cycle with setups */
[R2&4, B'2], [R&2, B', R, B, R'&2, B', R', B'], [R'2&4],
/* Second 3-cyle with setups */
[B&2, L', B'], [R&4, B', R, B, R'&4, B', R', B'2], [L, B'&2]

I suspect most people just use a "parity fix" which for that situation is mostly a chain of half-turns involving a combination of the U and U&2 slice and R&2 slice.

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Last edited by Brandon Enright on Mon Dec 19, 2011 5:37 pm, edited 1 time in total.

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 Post subject: Re: 4x4 parodyPosted: Mon Dec 19, 2011 5:33 pm

Joined: Tue Jan 13, 2009 8:23 pm

My mega parity vid for 4x4 and 5x5 main cases. It covers your case.

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 Post subject: Re: 4x4 parodyPosted: Mon Dec 19, 2011 5:36 pm

Joined: Thu Sep 24, 2009 12:21 pm
Location: Chichester, England
Hold the swapped edges in the UF and UR position and perform this: R2 D' Rw2 R2 U2 F2 Rw2 R2 F2 U2 Rw2 R2 D R2.

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 Post subject: Re: 4x4 parodyPosted: Mon Dec 19, 2011 7:08 pm

Joined: Sun Dec 18, 2011 3:01 pm
Thanks guys. This really helped me. Thanks for the algs.

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 Post subject: Re: 4x4 parodyPosted: Tue Dec 20, 2011 12:39 am

Joined: Tue Feb 08, 2011 3:17 am
Location: Australia
There's a few out there, while we're making a list this is the one I use, it's pretty easy to remember:
Uu2 R2 F2 u2 F2 R2 Uu2
It swaps the FL block for the FR block.
A setup like U2 B' R2 will fix an adjacent switch (like what has been discussed).
Cheers,
Burgo

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