The "Request an Alg" Thread

[obelisk477]

I have watched videos and have figured out how to commute every other center pieces than these ones. I already used this algorithm and it doesn't move the edge pieces in the 3x3 center of the 7x7 cube. Picture included.View attachment 5006

It's the same principle: 3R U 4R U' 3R' U 4R' U'

I'll say it again since you apparently haven't done this since last time, don't solve your centers like this, except for the last two which should be adjacent. Use standard reduction instead

 

[Lid]

I assume you want something like [r U r', e'] or [r' e r, U']

 

[EvanCahill]

Thank you, I solved the cube.

 

[FJT97]

Shortest zz compatible alg for the f2l case in which the rfd and rbd corners are interchanged?

 

[Praetorian]

you can watch RedKB's video on commutators

 

[biscuit]

I am new to commutators and I did try to come up with my own before asking but mine didn't work. So here it is. I am trying to work out a 3-cycle for 4x4 centers that does not affect the edges. The closest I have gotten is l' U2 r U2 l r' but this affects the edges too. If any one has or could come up with a good alg I would be vary appreciative! thanks!

 

[TDM]

I am new to commutators and I did try to come up with my own before asking but mine didn't work. So here it is. I am trying to work out a 3-cycle for 4x4 centers that does not affect the edges. The closest I have gotten is l' U2 r U2 l r' but this affects the edges too. If any one has or could come up with a good alg I would be vary appreciative! thanks!

[r U/U'/U2 r', u/u'/u2]

can you see how this works?

 

[biscuit]

[r U/U'/U2 r', u/u'/u2]

can you see how this works?

I don't understand what the slashes mean... Can you explain?

 

[martinss]

I don't understand what the slashes mean... Can you explain?

i think U/U'/U2 means you could try U or U' or U2...

I am new to commutators and I did try to come up with my own before asking but mine didn't work. So here it is. I am trying to work out a 3-cycle for 4x4 centers that does not affect the edges. The closest I have gotten is l' U2 r U2 l r' but this affects the edges too. If any one has or could come up with a good alg I would be vary appreciative! thanks!

l' U2 r U2 l r' = [l' U2 , r] = [A,B]
A = l' U2 . It affects the "l layer" and the "U layer".
B = r . It affects the "r layer".
("l layer" and the "U layer") ∩ ("r layer") = the four "Ur cubies"
A brought the four "Fl cubies" into ("l layer" and the "U layer") ∩ ("r layer").
B brought the four "Fr cubies" into ("l layer" and the "U layer") ∩ ("r layer").

So pieces affected by the commutator are the four "Ur cubies" + the four "Fl cubies" + the four "Fr cubies"


You should try something like this [l' , U r U'] = l' U r U' l U r' U'
A = l' . It affects the "l layer".
B = U r U' . It affects the "r layer" except the 4 "Ur cubies" but the 4 "Ub cubies"
(the "l layer") ∩ (the "r layer" except the 4 "Ur cubies" but the 4 "Ub cubies") = the "UBL X center (on U)"
A brought the "FRU X center (on F)" into (the "l layer") ∩ (the "r layer" except the 4 "Ur cubies" but the 4 "Ub cubies").
B brought the "FUL X center (on F)" into (the "l layer") ∩ (the "r layer" except the 4 "Ur cubies" but the 4 "Ub cubies").

So pieces affected by the commutator are the "UBL X center (on U)" + the "FRU X center (on F)" + the "FUL X center (on F)"

 

[biscuit]

Sorry I messed up my post what I should have said is I am looking for a 3-cycle for center bars. The commutator I gave works for the center bars but scrambles the edges

 

[martinss]

Sorry I messed up my post what I should have said is I am looking for a 3-cycle for center bars. The commutator I gave works for the center bars but scrambles the edges

You should try something like this [l' , U r U'] = l' U r U' l U r' U'

message too short

 

[biscuit]

unless I am doing the alg wrong that alg just swaps two pieces not bars

 

[TDM]

unless I am doing the alg wrong that alg just swaps two pieces not bars

It swaps 3, but you can't see one of them.

If you want to swap bars, try something like:
[E, r U2 r']

 

[martinss]

unless I am doing the alg wrong that alg just swaps two pieces not bars

OK I didn't get what did you mean by "bars"...

Well this is not a pure commutator but [l' , U r U'] [l' , U' r U]

 

[Christopher Mowla]

OK I didn't get what did you mean by "bars"...

Well this is not a pure commutator but [l' , U r U'] [l' , U' r U]

Here's an easy commutator to understand which swaps bars: [M U 2L2 2R U' M', B2], and here is a simpler one which swaps them in a different direction: [M 2U M' 2U', F2]. While I'm at it, also [M 2U M' 2U', U2].

 

[Animorpher13]

I know people keep asking this, but what is a good place to find G-perms and N-perms? I've looked at some the web but they all seem pretty hard, both to memorize and to recognize (which is why i saved them as my last 6 PLL's to learn). Can I get some help?

 

[biscuit]

OK I didn't get what did you mean by "bars"...

Well this is not a pure commutator but [l' , U r U'] [l' , U' r U]

yep that's exactly what I needed.

I know people keep asking this, but what is a good place to find G-perms and N-perms? I've looked at some the web but they all seem pretty hard, both to memorize and to recognize (which is why i saved them as my last 6 PLL's to learn). Can I get some help?

N perms are actully really easy. Do this alg while watching it figuring out how to do it. I think this is a but not sure

[L U' R U2 L' U R']2 U (do the moves in the brackets twice)

and here is b (I think it's it b. It really doesn't matter)
[R' U L' U2 R U' L]2 U

for G perms you just have to buckle down and memorize one. Use the speedsolving wiki to find one you like

 

[TDM]

I know people keep asking this, but what is a good place to find G-perms and N-perms? I've looked at some the web but they all seem pretty hard, both to memorize and to recognize (which is why i saved them as my last 6 PLL's to learn). Can I get some help?

G perms are the most common PLLs, so definitely learn them as soon as possible.

The best place to find algs is algdb.net.

Recognition for the G perms isn't as hard as it looks, but try to look at images of a cube rather than diagrams with arrows. I found it helpful to have quite different algs for each case (one began with R2 u R'..., one with F' U' F R2..., one with R2 F2 R U2... and one with R2 F' R U R U'...). I didn't ever get confused between cases and I didn't need to worry about which rrururYruryrRUr alg was which. If it helps try learning them slowly; learn one, and then when you start being able to recognise and execute it comfortably in solves, move on to the next one.

 

[Roman]

Hello fellows. Can someone help me to find convinient algs for those edges cases (and their inverses):
UF->BR->UB
UF->RB->UB
UF->FR->UB
UF->RF->UB

Also, I could do it using cube explorer but I can't find where to download it now. Can you help me there as well? Please

 

[Randomno]

Hello fellows. Can someone help me to find convinient algs for those edges cases (and their inverses):
UF->BR->UB
UF->RB->UB
UF->FR->UB
UF->RF->UB

Also, I could do it using cube explorer but I can't find where to download it now. Can you help me there as well? Please

I think there's R U F B' R2 F' B U R' and R U R U R2 U' R' U' R' U2 for the first one.