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Please help! Need a 4x4 commutator that does the following...

cuber786

Member
Joined
Oct 24, 2008
Messages
4
Please help me, I really need a commutator that does the following on the 4x4:

switches DFr->UBr->DFr.

I need it because during 4x4 bld, if I have parity for edges, only DFr and Ubr need to be switched with each other thats why I am asking.

Thanks in advance.
 

shelley

chang
Joined
Apr 23, 2006
Messages
1,686
WCA
2004CHAN04
hmm...idk because I cant really make commutators myself.
Thanks. That was really helpful.

You could always set it up as the 4x4 "OLL parity" which switches two edges (e.g. l' D2 l and then do the OLL parity to "flip" the UB edge. Just be aware that the alg changes U centers around). Or try this alg Lucas gave me that I never bothered to learn: r' U2 r2 U2 r U2 r U2 l r2' U2 r' U2 r U2 l' U2
 
Last edited:

cmhardw

Premium Member
Joined
Apr 5, 2006
Messages
4,106
Location
Atlanta, Georgia
WCA
2003HARD01
switches DFr->UBr->DFr.
It's impossible to have a commutator do this, because it is an odd cycle. However, I would use this alg if you are allowed to rotate the U center 180 degrees.

D R F' l' U2 l' U2 F2 l' F2 r U2 r' U2 l2 F R' D'

Chris

--edit--
sorry Shelley, I skimmed this thread too quickly, beaten to the punch ;-) Shelley's alg is shorter and more execution friendly than mine, so I recommend to use hers instead.
 

shelley

chang
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Apr 23, 2006
Messages
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2004CHAN04
Maybe I learned it once, then forgot it. I emailed it to myself so it's in my Gmail archives if I ever need to pull it out.
 

Kenneth

Not Alot
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Aug 10, 2007
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Kauparve, Hejde, Gotland, Sweden
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2005GUST01
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Kubbuth
OK, then I got a tricky but short one (alg, not commutator) that I just made up:

F2 r (y) M2 (y) U2 l' U2 l U2 r' U2 r (x') U2 r D2 r' U2 (x')

Looks long because of all orientations but it is "only" 16 turns. Remove first and last move, that are setup + restore, and it swaps two diagonal LL edges.
 
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