4x4 pure double parity?

[kidrock2007]

I want know alg of case parity 4x4 (conmutator)
thank :d
EX:

 

[JianhanC]

Please put a question mark behind your title next time.

Rw2 x' U2 x Rw' U2 r' U2 x' U2 r' U2 r U2 r' U2 Rw2 R' U2 R2 Syuhei parity. From esquimalt1's video.

 

[Kirjava]

You can't solve this case with a commutator unless you do a single quarter inner slice turn first.

 

[Bapao]

I learned how to solve a 4x4x4 yesterday. I was wondering, is there a shorter alg for up face parity than:

Rr2 B2 U2 Li U2 Rr' U2 Rr U2 F2 Rr F2 Li' B2 Rr2

? I've already learnt it now, but a shorter alg suggestion would be appreciated.

Regards,

H

 

[Kenneth]

I learned how to solve a 4x4x4 yesterday. I was wondering, is there a shorter alg for up face parity than:

Rr2 B2 U2 Li U2 Rr' U2 Rr U2 F2 Rr F2 Li' B2 Rr2

? I've already learnt it now, but a shorter alg suggestion would be appreciated.

Regards,

H

Why do you think the alg you learnt is 15 moves?

Spoiler

There are no shorter alternatives =)

--------
My DP alg : r U2 r' E2 (F2 l F2 l' F2 r F2 r') D2 l

the parentesis is a 3-cycle blocks using a com.

 

[Bapao]

Why do you think the alg you learnt is 15 moves?

Spoiler

There are no shorter alternatives =)

--------
My DP alg : r U2 r' E2 (F2 l F2 l' F2 r F2 r') D2 l

the parentesis is a 3-cycle blocks using a com.

Thanks
I've found shorter versions of algs that I had previously learnt before, so that's why I asked. Sorry for the dim-witted question
Maybe you know of a different alg that is a few steps longer that might be easier to remember? Not that this one is mega hard to remember or anything, I just like to keep things simple where I can.

 

[Christopher Mowla]

Maybe you know of a different alg that is a few steps longer that might be easier to remember? Not that this one is mega hard to remember or anything, I just like to keep things simple where I can.

I am not sure what type of algorithm is easier for you to remember, but here is an algorithm 4 btm longer than the optimal path (which is 14 btm) that:
1) Uses all U2 face turns
2) Has two full commutators inside (with all moves canceled)
r2 U2 r' l U2 r' U2 r U2 l' U2 r U2 r U2 r' U2 r = r2 U2 r' [l U2 r', U2] r [U2, r] U2 r (18 btm)

(The extra quarter turn is merged with a conjugate quarter turn move in the r2 move.)

 

[Sa967St]

Chester put together a bunch of nice O parity and double parity algs:

http://www.speedsolving.com/forum/showthread.php?11311-4x4x4-OP-DP-algorithms-(more-finger-friendly)

 

[Bapao]

Brilliant, thanks for the information to the both of you