The One-Answer Question Thread [closed]

[danthecuber]

Is there an efficient way to tell if a rubik's cube state is 2-gen?

If there is a 2x2x3 block anywhere on a 3x3x3 cube, then I believe it can be solved in 2-gen.

 

[RyanReese09]

If there is a 2x2x3 block anywhere on a 3x3x3 cube, then I believe it can be solved in 2-gen.

Sorta, not really though.

Check if CP is correct. And all edges must be oriented. Check if by only doing the 2gen moves, that all the unsolved pieces can be moved into their correct spot (aka any pieces untouched by the 2gen moves must be solved)

 

[Walter Souza]

If there is a 2x2x3 block anywhere on a 3x3x3 cube, then I believe it can be solved in 2-gen.

It's not enough. All edges must be oriented and there is some permutation constraint I don't understand.

 

[JonnyWhoopes]

If there is a 2x2x3 block anywhere on a 3x3x3 cube, then I believe it can be solved in 2-gen.

First, I don't think he meant 2gen as in <RU>. <RUF', L2> is also 2gen, as are many other things (iirc).

Secondly, perform FRUR'U'F'R2U on a solved cube. Very clearly a 2x2x3 block, and NOT solveable via <RU>.

 

[vcuber13]

If there is a 2x2x3 block anywhere on a 3x3x3 cube, then I believe it can be solved in 2-gen.

do an a perm and see if it works

 

[RyanReese09]

do an a perm and see if it works

2gen Aperms exist FYI. So your example is still solvable 2gen.

 

[Walter Souza]

Prisma's 2-gen scramblers are broken. I'm looking for a way to generate true random 2-gen states.

Sorta, not really though.

Check if CP is correct. And all edges must be oriented. Check if by only doing the 2gen moves, that all the unsolved pieces can be moved into their correct spot (aka any pieces untouched by the 2gen moves must be solved)

Is there an efficient way (ie. without actually solving the cube) to do this?

 

[RyanReese09]

Well, if EO is solved, and your 2gen moves are just RU, make sure that the left block (as done in Roux) is solved. It's just...you should be able to know what moves won't affect certain parts of the cube. Common sense.

 

[uberCuber]

Walter Souza, define what you want to mean by 2-gen. <R,U> is 2-gen. <M,U> is 2-gen. <RUR'LDF,L2B> is 2-gen. If you mean 2-gen in the broadest sense, I don't think there really is an efficient way to check.

 

[Walter Souza]

Walter Souza, define what you want to mean by 2-gen. <R,U> is 2-gen. <M,U> is 2-gen. <RUR'LDF,L2B> is 2-gen. If you mean 2-gen in the broadest sense, I don't think there really is an efficient way to check.

Sorry. <L, U> and <R, U>.

 

[Ickenicke]

How big is the chance to get a LL skip at a 2x2 cube?

 

[conor]

is the lubix guhong ultiamte better than the general Dayan Guhong, also is lubixcube.com safe and reliable?

 

[sauso]

brought 2 cubes from them now. perfectly safe.

 

[conor]

is lubixcube.com safe and reliable, also how good is the shipping?

 

[StachuK1992]

Donovan's a pretty cool guy, the lube is great, and I've heard good things.
No idea about the shipping.

 

[wontolla]

is lubixcube.com safe and reliable, also how good is the shipping?

Yes, reliable. The shipping depends on which country you live. To UK it takes 2 or 3 weeks approx.

 

[chrissyD]

Yes, reliable. The shipping depends on which country you live. To UK it takes 2 or 3 weeks approx.

took 8 days for me

 

[Cool Frog]

2gen Aperms exist FYI. So your example is still solvable 2gen.

whut?

in roux method, for the F4 case, I got an alg:
U²
B’[RUR’]
B (RU’)
BR’

and I couldn't figure out a way to go into the 2nd B turn without regripping, can anyone help me with this?

I find this is a really fast alg until that 2nd B turn

I prefer its inverse for a different case... and R' D R U' R U' R' U R' D' R

 

[StachuK1992]

2-gen Aperm:
<R' D' R, U>

A B A' B A B2 A'
looks like
R U R' U R U2 R' to me.

 

[Muesli]

Is the Shenshou stocked at icubemart a VIII?