The "Request an Alg" Thread

[Gordon]

Any way to swap the two wrong cross pieces without destroying the rest of the F2L?

Spoiler

 

[Username]

Any way to swap the two wrong cross pieces without destroying the rest of the F2L?

Spoiler

Use MU gen moves

 

[Lid]

Here are some short ones CubeX found:
M' U2 S' U S M (6f*)
M' S' U' S U2 M (6f*)
S' U2 M' U' M S (6f*)
S' M' U M U2 S (6f*)
R' F' R F D' R' F R D F' (10f*)
R' D F R F' D' R F R' F' (10f*)
F R F' R' D F R' F' D' R (10f*)
F D' R' F' R D F' R' F R (10f*)

edit:

Did CubeX label the first 4 algorithms as being 6f? They are also 10f.

Yes, I just copy & pasted.

 

[Christopher Mowla]

Here are some short ones CubeX found:
M' U2 S' U S M (6f*)
M' S' U' S U2 M (6f*)
S' U2 M' U' M S (6f*)
S' M' U M U2 S (6f*)
R' F' R F D' R' F R D F' (10f*)
R' D F R F' D' R F R' F' (10f*)
F R F' R' D F R' F' D' R (10f*)
F D' R' F' R D F' R' F R (10f*)

Did CubeX label the first 4 algorithms as being 6f? They are also 10f.

Heya guys, can I have a good alg for 4x4 PLL parity for vertical and diagonal last corners swap and edges swap? all PLL, thanks!

I am not sure exactly what cases you are referring to, despite that I have an idea of what you possibly want. Regardless, read from this point on in the 4x4x4 parity algorithms wiki page. If none of the cases you wanted were in the PLL parity section, they are probably here:
http://www.math.leidenuniv.nl/~mfung/speedcubing/algs/4x4x4/

 

[YddEd]

Are there any good OH T and Y perms?

 

[Kattenvriendin]

I am looking for a 5x5 flip wing edges algorithm, but I can only use U, Uw, and R and Rw.

I can do a surrogate F on one or two layers, but not sure how well it would work with the wingflip.

(bandaged 5x5 1x3x5 block is bandaged)

 

[ottozing]

Are there any good OH T and Y perms?

Standard T perm is fine for OH imo

For Y perm - R2 U' R' U R U' x' U' z' U' R U' R' U' z U R

 

[Cubemaestro]

i need a easy and fast to execute algo for the headlights oll. i currently use R2 D R' U2 R D' R' U2 R' which takes me about 5 seconds.( my average is 19 seconds)

 

[Username]

i need a easy and fast to execute algo for the headlights oll. i currently use R2 D R' U2 R D' R' U2 R' which takes me about 5 seconds.( my average is 19 seconds)

Headlights in the back: R2 D' R U2 R' D R U2 R
Headlights to the left: R U R' U' (R U' R' U2)(R U' R' U2) R U R'

 

[Cubemaestro]

thanks man using a rubiks brand its 5 seconds, using my zhanchi it certainly would be better. my avg is gonna get better cuz it comes up a lot for me

 

[Christopher Mowla]

I am looking for a 5x5 flip wing edges algorithm, but I can only use U, Uw, and R and Rw.

I can do a surrogate F on one or two layers, but not sure how well it would work with the wingflip.

(bandaged 5x5 1x3x5 block is bandaged)

When you asked for a "wingflip", I wasn't sure if you wanted an odd number of 2-cycle swaps or an even number. I also assume that you want "pure" flips, and not something like this (the following is an OLL parity algorithm):
Rw' U R' U2 R U' Rw' U2 Rw' U2 Rw' U' R U2 R' U Rw'
or any of these
Rw U' R U2 R' U2 R' U' Rw U2 Rw R U2 Rw U' R' U2 R' U2 R U' Rw
Rw U' R U2 R' U2 R' U' Rw U2 Rw R U2 Rw U' Rw' U2 R' U2 Rw U' Rw
Rw U' Rw U2 R' U2 Rw' U' Rw U2 Rw R U2 Rw U' Rw' U2 R' U2 Rw U' Rw

Also, given the moveset <U, Rw, R>, and based off of the 1x3x5 block bandage, I assume that the move r is acceptable since Rw R' = r.

Therefore,

(1) If you wanted an even number of flips, here are some 2 flips:
[U Rw' U2 r2 U2 Rw U', R]
[U Rw' U2 r2 U2 Rw U', R2]
[U Rw' U2 r2 U2 Rw U', R']
You may invert all turns to get the mirrors, and, if you need one of the edges flipped to be in UF, just conjugate with U turns.
For example, U' [U Rw' U2 r2 U2 Rw U', R] U.

(2) If you wanted an odd number of flips, the four optimal <U,r> solutions for the single flip are:
r U2 r' U2 r U2 r U r U r U2 r2 U2 r U2 r U r' U' r2 U2
r U2 r' U2 r U2 r U' r U' r U2 r2 U2 r U2 r U' r' U r2 U2
r2 U r' U' r U2 r U2 r2 U2 r U' r U' r U2 r U2 r' U2 r U2
r2 U' r' U r U2 r U2 r2 U2 r U r U r U2 r U2 r' U2 r U2
and you may invert all turns to get a y2 cube rotation.

 

[whauk]

Are there any good OH T and Y perms?

i use this T-perm: R U R' U' z' U2 R U' z U' R' U' R U R2 D R
if you feel comfortable doing U2s you can also do this one: z U2 r' U2 r U2 x U2 r U2 r' U2

and Y-perm: R2 U' R' U R U' x' U' z' U' R U' R' U' z U R
or R2 U' R' U R U' x' U' z' U' R U' R' U' r B with this fingertrick: http://youtu.be/xzSFeDEQeL0?t=2m37s

 

[Lid]

I use the same Y & T as whauk, but I do some rotations differntly +I'm a righty, another variant of the other Tperm: z U2 R' U2 R U2 x U2 R U2 r' U2 r

 

[Kattenvriendin]

snip

r U2 r' U2 r U2 r U r U r U2 r2 U2 r U2 r U r' U' r2 U2

this one did the trick.. thank you SO much.

How on earth do you know all this?? I searched till I saw blue in the face and decided to ask here in the end.. thanks again!!

 

[Christopher Mowla]

r U2 r' U2 r U2 r U r U r U2 r2 U2 r U2 r U r' U' r2 U2

this one did the trick.. thank you SO much.

How on earth do you know all this?? I searched till I saw blue in the face and decided to ask here in the end.. thanks again!!

Well, I didn't come up with those optimal <U,r> solutions. Kåre Krig found them using his k-solve program and cuBerBruce found them using k-solve as well.

I did find my own intuitive <U,r> algorithm, but it's about twice as long!
r U2 r2 U r' U2 r' U2 r U2 r U2 r2 U2 r2 U2 r2 U r2 U' r' U2 r' U2 r U2 r U2 r2 U2 r2 U2 r2 U r U2 r2 U2 r'

I would have shown you my
3r U2 3r U' 3r U2 3r U2 3r' U2 3r' U' 2R' U 3r U2 3r U2 3r' U2 3r' U' 2R2 U2 3r' U2 3r'
, which only uses two inner layer half turn slices but it also includes the central slice in the Rw turns on odd cubes, which I believe to be out of the question for the restrictions you gave.

But just about all of the parity algorithms I show people in this thread recently (and probably from now on) I just grab from the 4x4x4 parity algorithms page. In fact, I grabbed those four optimal <U,r> solutions from that page today.

Many of the algorithms on that page can be translated to cube sizes larger than the 4x4x4 directly (as these <U,r> solutions were), but some translations are not very obvious and some translations, although they might be straight forward, have a different affect on larger cubes.

Of course, I have made more than half of all of the algorithms on that page by hand, so if you want an algorithm that is not on that page or hasn't been made before, don't be shy to ask...I just doubt that there are that many good algorithms left to find for the cases on that page that are not already on that page.

 

[Kattenvriendin]

The 3r would have worked in my case, as I was holding the cube with 4 free layers on the right, and 2 on the top layer, which was the most ideal position to solve it in.. also because that way I can do that surrogate F move (4r U 4r') which is some cases is handy to have

Thanks again for looking it up.

 

[TDM]

Is there a short alg to superflip edges, but leaves the corners in any way? I'm just interested in edge orientation for now, and don't need corners.

 

[Lid]

Shortest is 14htm: U R U D' F' U' D B R D F R L F (from cubex) for example.

 

[Cubo largo]

Is there an algo with only M and U to solve the M2s M layer pieces?

 

[Username]

Is there an algo with only M and U to solve the M2s M layer pieces?

There is for FU and DB, but not for BU, FU or BD

Check out Noah's tutorial on Cubing World if you want to learn M2