The One-Answer Question Thread [closed]

[clincr]

MaeLSTRoM, no. Although some say that the V-Cube 7 white is different from the black.

Question: in official WCA competitions, how many moves are used to scramble a 3x3?

 

[uberCuber]

This has been asked before, and its COLL-ELL.

No, its CLL-ELL. Take a look at these:
http://www.speedsolving.com/wiki/index.php/CFCE
http://www.speedsolving.com/wiki/index.php/CLL_algorithms_(3x3x3)
Certainly doing COLL-ELL is possible, though for certain cases, the COLL algs are not as good as the corresponding CLL alg would be, because COLL has to maintain the edge orientation while CLL does not have to.

Odd layered cubes can have no parity. I think you are talking about last two edges algs.

I originally thought they were parity as well, until it happened on my gigaminx and I asked how to solve the parity, and people told me it wasn't a parity.

You are mixed up about this. Remember, just because you can solve a gigaminx the same way as a 5x5 does not make them the same. Parity can occur on a 5x5, but not on a gigaminx.
When pairing the last 2 tredges on a 5x5, you can get cases where, if you use the common d R F' U R' F d' alg once or twice to do the pairing, one of the tredges will be solved, and the other will have the two wings swapped (the appearance of being flipped). Then a parity alg is necessary. This page lists each last-2 edges case according to whether or not it is a parity case.
This cannot happen on a gigaminx for the same reason that you cannot do a 2-corner-and-2-edge swap on a megaminx. This odd permutation parity of corners and edges can happen on a cube because when you do a single quarter turn, it does a 4-cycle of corners and a 4-cycle of edges (which right there is odd permutation). But on a dodecahedron a single turn does a 5-cycle of each kind of piece, which is even permutation, making parity impossible.
EDIT: Try it out for yourself. Take a megaminx, do the common T-perm alg on it, and notice that it does 2 3-cycles instead of 2 2-cycles like it does on a cube.

 

[MaeLSTRoM]

clincr: 3x3x3 scrambles are "Random Position" but i think that means 20 (optimal moves) + 1 or 2 extra moves to ensure randomness.

 

[uberCuber]

clincr: 3x3x3 scrambles are "Random Position" but i think that means 20 (optimal moves) + 1 or 2 extra moves to ensure randomness.

Random Position means they generate a random position with Cube Explorer, and Cube Explorer gives the moves to solve that position. (I am unsure whether or not they use the optimal setting in Cube Explorer, but if they do, that would mean that 20 moves would be the maximum number of moves for the scramble, not the minimum. Some scrambles would be 16, 17, 18, etc. but never more than 20.)

 

[Rpotts]

No they don't use optimal setting in CE when generating a scramble as it would take the computer too long to quickly generate a scramble. It searches other depths first, as the number of moves is irrelevant, just the position is needed.

 

[ben1996123]

It's not confusing at all. The of the all corners oriented OLLs there are 7 unique cases (8 including OLL skip). You can have adj in FR, BR, BL and FL meaning there are 4 ways to get OLL 28

Since there are 4 ways to get it, we can infer a 4/216 probability, which reduces to 1/57.

For the two opposite edges case, OLL 57

there are only two ways it can appear, FB and LR, because a y2/U2 will give you the exact same case, unlike the adjacent edges case. 2/216 = 1/108

For the no edges all corners case, OLL 20

there is only one was for this case to appear, as doing a y,y' or y2 doesn't change arrangement of oriented/misoriented stickers. 1/216

AKA. Rotational symmetry. OLL's with rotational symmetry 1 (looks different from every angle) have a 1/54 chance, OLL's with rotational symmetry 2 (looks the same from 2 different angles, and different from the other 2) have a 1/108 chance, and OLL's with rotational symmetry 4 (looks the same from every angle) have a 1/216 chance (4 edge flip/OLL skip).

 

[ilikecubing]

Whats the best 4x4 K4 method tutorial on youtube?

 

[HavoCentral]

If you have worn/old stickers, are you required to replace them before a comp? or just for BLD.
I have vinyl ones, and when the peel slightly, I shaved off the peeled area, so the stickers are still good, but not uniform.

 

[EricReese]

If you can tell the stickers apart by their feel, you may not use them in BLD. Otherwise just make sure that you can clearly tell the difference between the stickers.

 

[d521yts]

does a OLL/PLL/LL skip happen more frequently in Petrus than CFOP?

 

[EricReese]

Yes, because the edges are oriented (unless im mistaken, I probably am about the petrus method) which increases the chance.

 

[Samania]

I want to try Rubik's Cube art, but is there some kind of program that generates the photo with all the individual pixelated colors?

 

[uberCuber]

Yes, because the edges are oriented (unless im mistaken, I probably am about the petrus method) which increases the chance.

Yep, you are correct. In petrus the edges are always oriented, whereas in fridrich they are not always oriented, making less total cases in petrus and a higher chance of a skip.

 

[EVH]

Yes, because the edges are oriented (unless im mistaken, I probably am about the petrus method) which increases the chance.

You are correct, PLL skips are also more common because the corners are permuted before orientation.

 

[uberCuber]

You are correct, PLL skips are also more common because the corners are permuted before orientation.

not everybody (as in, not even Petrus himself) actually solves the last layer the way his site has it laid out, doing Niklas or whatever to permute corners before orienting them. Lars Petrus, and many speedsolvers, use some kind of combination of OLL/PLL and COLL/EPLL for the last layer

 

[johnstan]

Is this the same core as in a Alpha 3-f ??
http://www.cubedepotusa.com/apps/webstore/products/show/1426645

 

[baseball-chicago]

what does sup mean? in like sup 100 or sup 10

 

[Vinny]

I feel as if all of the G perms are extremely awkward to perform. It's literally faster for me to just do the A then U perm... what are your favorite G perms?

 

[Cool Frog]

what does sup mean? in like sup 100 or sup 10

I don't know the acronym or anything but I am pretty sure it means "Over", opposite of Sub.

 

[AvidCuber]

what does sup mean? in like sup 100 or sup 10

If you mean sub, it means that you're below a certain time. For example, if you're sub-20 on 3x3x3 that means that an average solve for you is below 20 seconds.

If you mean sup (because that's what you wrote) then it means you're above a certain time. For example, if an average was almost sup-20 it means it was almost above 20 seconds.

EDIT:

I don't know the acronym or anything but I am pretty sure it means "Over", opposite of Sub.

Yes it does, and I don't think it's an acronym. Just the prefix. Like, a submarine goes below the water.