Blindfolded M2 Help and Discussion thread

[mark49152]

I need help when all my edges I need to solve are in the m slice and I end up with a progression like "C W A" (using speffz)
Am I doing something wrong or is there something specific I need to do, I'm pretty sure I'm using the right algorithms.

You have to remember to swap cases (C-W or I-S) for even swaps, and that means you often end up executing a case twice. So for example, if your cycle is BD CW you would execute as BD CC. If your cycle is BC WD you would execute as BW WD. Etc.

 

[Christmas]

You have to remember to swap cases (C-W or I-S) for even swaps, and that means you often end up executing a case twice. So for example, if your cycle is BD CW you would execute as BD CC. If your cycle is BC WD you would execute as BW WD. Etc.

Thanks man
I'll try this

 

[RicardoRix]

Out of interest, when you come to a flipped buffer edge ((K) or FD), and you just start a new cycle. How does this piece end up flipped the right way? At what point does this happen?

 

[Christmas]

Out of interest, when you come to a flipped buffer edge ((K) or FD), and you just start a new cycle. How does this piece end up flipped the right way? At what point does this happen?

To start a new cycle, let's say you put you're buffer at L then you should end at F and That puts the butter in the right orientation

 

[Sergeant Baboon]

Out of interest, when you come to a flipped buffer edge ((K) or FD), and you just start a new cycle. How does this piece end up flipped the right way? At what point does this happen?

You can't have two edges flipped on a cube so if you've solved all 11 other edges then your buffer will necessarily have the right orientation. Basically, through the magic of mathematics, when you end your last cycle you'll be shooting to the buffer sticker on the buffer piece every time.

 

[oneshot]

I need serious help

So, I'm not stupid, but I'm not grasping M2 edges, and putting it all together. I've watched every tutorial I can find. I'm going to blame it on my kids who won't give me more than 5 seconds without bothering me...

My orientation is: yellow on top, blue in front, red on the right
I use Speffz (I use Y, not X)

I made up a scramble and was wondering if anyone could check what I'm doing

Scramble: R2 D L U R' F' L U2 F2 L D' U

So here's what I think I'm supposed to do:

Memo for corners: VG BT SI J (So since there is a single letter at the end I have parity, right?)

Memo for Edges: (TU - do I do anything for U?) new cycle? (BQ) (FP) (IS - but since S is at an even number, do I do "I" again?) (YR) (OM)

So I would solve edges first, then since there is parity, I would do the parity fix: D' L2 D M2 D' L2 D

*But I just noticed that if there's parity for corners, shouldn't there be parity for edges? My edge memo doesn't have an extra letter, unless I was supposed to leave out the "U" and memo would have been: TB QF PI SY RO M

Then I would do corners.

Does that seem right?

So I start with "T" It goes where it's supposed to, but it brings the buffer piece to where it should be. Then I do "B" and it seems screwed up already.

Help?

Brian

 

[mark49152]

You got it already - you leave out U. Once you hit your buffer piece, when you solve T, your cycle is done and you immediately move on to the next, which you are doing correctly with B. That first B just moves the piece into your buffer, so its not screwed up, and from Q onwards you will see those pieces getting solved.

Also correct that the even S is executed as I.

 

[oneshot]

I don't know, it still doesn't work...

I just don't get it.

 

[Kit Clement]

Yep, you should leave out your buffer as a target. You might find this tool useful for practicing BLD and checking your memo:

http://csclub.uwaterloo.ca/~krmatthe/BLD-Memo-Tools.cgi

 

[mark49152]

I don't know, it still doesn't work...

I just don't get it.

Your corrected edge memo TB QF PI SY RO M works for me. Notice that it's now I that's on the even target so you would execute as PS SY.

 

[oneshot]

I've done it like 20 times making sure I'm doing the right turns, still doesn't work. It has to be something in my execution because I'm looking at the memo.
I'm doing TB QF PS SY RO M.

But last night I randomly scrambled the cube, and got all of them right (first time ever). Maybe one of my algs is copied wrong?

 

[willtri4]

I've done it like 20 times making sure I'm doing the right turns, still doesn't work. It has to be something in my execution because I'm looking at the memo.
I'm doing TB QF PS SY RO M.

But last night I randomly scrambled the cube, and got all of them right (first time ever). Maybe one of my algs is copied wrong?

Do some sighted M2 solves to make sure you're shooting to all your targets correctly.

 

[adimare]

If you have doubts with execution you can use scrambld.cubing.net. You input a scramble and it produces the letter pairs needed to solve it plus an actual solution. The only caveat is that to solve parity it swaps UB with UL during memo, so the proposed solution might not match yours. Your scramble: http://scrambld.cubing.net/?scramble=R2_D_L_U_R-_F-_L_U2_F2_L_D-_U

 

[mark49152]

Yeah just do it one at a time time sighted and tell us which one you're screwing up.

 

[oneshot]

T goes where it should, and it brings the buffer piece to the buffer position.
I did B, and the buffer piece (that was in the buffer position) goes to where B should be. The Q/A piece is now in the buffer position.
I did Q, and it went to the right place. F works.
P goes where it's supposed to.
I did S, and the I piece went to the correct place.
After the second S, it seems like everything is in the right place but off by M2
Y seems like it worked.
R seems to work too.
O worked.
M went to where it should be, but it's off by M2. This has to be the point I'm messing up. When I finish M, the edges should all be solved, right? Or since there was a letter by itself at the end, do I need to do another M2? But even if I do, the buffer piece and target piece are switched.

And I noticed that the D/E edge is flipped. Did I just miss that in memo?

ETA: I did D then E, which I hadn't seen that I should before. Now everything is in the right place, just the buffer piece and the target piece are switched.

Edited again: Oh, so I guessed that the buffer piece and the target piece switched is what happens in parity? So I tried and continue. I did the parity fix and the corners and everything worked! The only thing is that I finished M2 off. Will that happen everytime there's parity? Or something else, meaning how do I know if it will be off by M2?

 

[mark49152]

If there's an odd number of edge targets, you do the parity fix D' L2 D M2 D' L2 D, after edges and before doing OP corners. That should leave the M2 layer in the right place, and all edges solved except UL and UB will be swapped.

If the UL piece is flipped, you will of course have to fix that before parity, since parity fix will move it to the UB position. Or you could fix it at UB, or at the end of the solve. Or fix it by shooting UB and UL to their opposite positions.

I would post a complete solution, but I don't have my PC with me and it's too fiddly from a phone.

 

[Nam Dank the Tank]

How do you solve edges if the UB piece is flipped at the start? When everything is solved the buffer and UB are swapped. In OP it was easy, just 2 J perms and setups. Is the only way to do it F2 M'U'*4 MU*4?

 

[sqAree]

I do (U' M')*3 (U' M) (U' M')*3 (U' M) after having solved the other edges.

 

[Daniel Lin]

How do you solve edges if the UB piece is flipped at the start? When everything is solved the buffer and UB are swapped. In OP it was easy, just 2 J perms and setups. Is the only way to do it F2 M'U'*4 MU*4?

You can just shoot to UB and then to BU.
(M2) (B' U R' B U' M2 U B' R U' B)

Or just F2 to setup to M' U M' U M' U2 M U M U M U2

 

[mark49152]

How do you solve edges if the UB piece is flipped at the start? When everything is solved the buffer and UB are swapped.

See other replies for algs, but also take care if you do the UB/UL parity swap into OP corners. If you do your flips after parity, your flipped UB edge will now be in UL. That pitfall has caused me many a DNF