[Help Thread] FMC Discussion

[Mirek]

Hmm? I cannot understand what to do exactly...
I know the LL alg, but should I solve it in another way?

Spoiler

Scramble: L2 D' R B2 R' D L U2 L

Turn pre-scramble R' for better understanding.

Pseudo F2L: R
LL: F' (U B' Dw2 B U' B' Dw2 B) F
Correct pseudoness: R'

No, this is not the right solution. It must be a linear solve. No pre-moves allowed.

 

[okayama]

No, this is not the right solution. It must be a linear solve. No pre-moves allowed.

Actually it was a linear solve... premove was not needed.

I still don't understand what you intended and what purpose would that serve. :confused:
So I will wait your solution, it may answer my question.

 

[Cubenovice]

I still don't understand what you intended and what purpose would that serve. :confused:
So I will wait your solution, it may answer my question.

If I understand correctly the challenge is to leave a PLL in less than an 8 moves.

 

[Rpotts]

This used to be in Faz's signature, titled "4 move OLL" or something, linking to alg.garron, it's pretty cool.

 

[Mirek]

Actually it was a linear solve... premove was not needed.

I still don't understand what you intended and what purpose would that serve. :confused:
So I will wait your solution, it may answer my question.

Cubenovice understands it correctly. You can also peek into kinch2002's correct solution if you want.

 

[okayama]

If I understand correctly the challenge is to leave a PLL in less than an 8 moves.

Spoiler

For example,

Scramble: R B' R Uw2 R' B R Uw2 R2 B

can be solved as follows:

Pseudo OLL: L R'
T-perm: (UF <-> UB, UFR <->ULF)
Correct pseudoness: L' R

in the same way as my previous post.
According to Mirek, such a solution is not allowed, but L R' actually orients cubies and the rest is solved by PLL.
I couldn't understand the profit by banning such a solution...

 

[Sebastien]

Got another 27 today at Danish Open, 5th official 27, 11th official sub30

Scramble: R2 D' B2 D' B2 U L2 R2 B2 U' R B L B R B' R F2 U'

after <10 minute I found this awesome start on the normal scramble: D U2 B' R' D' U' * L F2 D' F2 D'

This is what I did with that (and I'd really be interested if anyone of you can find a better ending):

(1) L F' R' F L' F D R' D' R (3 corners in 21 moves)

* = D2 L' U2 L D2 L' U2 L (2 move cancelation)

makes 27 moves

(2) apply R' to finish Triple X-Cross and switch to inverse: F R F2 D' F' D F D R' D' F2

So 23 moves to 3-cycle: D U2 B' R' D' U' L F2 D' F2 D' R' F2 . D R D' F' D' F : D F2 R' F'

. = F2 D B D' F2 D B' D' or
: = F' D' B' D F D' B D

gives 4 moves cancellation and gives 27 moves solution.

 

[Mirek]

Spoiler

For example,

Scramble: R B' R Uw2 R' B R Uw2 R2 B

can be solved as follows:

Pseudo OLL: L R'
T-perm: (UF <-> UB, UFR <->ULF)
Correct pseudoness: L' R

in the same way as my previous post.
According to Mirek, such a solution is not allowed, but L R' actually orients cubies and the rest is solved by PLL.
I couldn't understand the profit by banning such a solution...

You have to have f2l, not just a pseudo f2l. Your scramble also have such a solution within 7 moves.

 

[Julian]

You have to have f2l, not just a pseudo f2l. Your scramble also have such a solution within 7 moves.

Solution for F2L + OLL?

Spoiler

L R' U2 L' R

Or did you mean a full solution?

 

[Mirek]

Solution for F2L + OLL?

Spoiler

L R' U2 L' R

Or did you mean a full solution?

You got it. This one is too obvious.

 

[Kenneth]

... This one is too obvious.

Don't say that, I failed :/

 

[Mirek]

One more LL puzzler

I decided not to wait a week and post a second one.
Generate the following position:
F' U2 F L' F' L U2 L' F L
Starting from there, orient the cubies in less than 8 moves and finish with permutation J.
A pseudo f2l is not allowed here.

 

[Lid]

Spoiler

x y R2 U R2 U R2 U2 R2 or U2 F U2 F U2 F2 U2 without rotations...

 

[Pyjam]

Scramble = B2 L' F2 L2 B2 R D2 R2 B2 U2 F D B F2 L F' U L' B2 F2

I found this incredible start :

Pre-scramble : U F' (2)
Start : L' U' D L' (6)

This build a 2x2x3 block and 3 pairs. Too bad, it doesn't prepare the coffee too.

After this, I switched to the reverse scramble.

Pre-scramble : L D' U L (4)
F @ U' : (6) 2x2x3 block + 3 pairs
L' D L2 B L' D2 : (12) F2L -1 slot
x' U B U' B' R' U' R U2 : (20) All but 3 corners.

At @ insert (R2 U' L U R2 U' L' U) : (25) 3 moves cancelled.

Solution for reverse scramble:
F R2 U' L U R2 U' L2 D L2 B L' D2 B D B' D' R' B' R B2 L D' U L

I wonder if there is a better continuation after the first 6 moves.
Waiting for your analysis. Thanks.

 

[Kenneth]

F' U2 F L' F' L U2 L' F L

Spoiler

Orient : (xy) R2 U R2 U R2 U2 (R2)
J-perm : R' L U2 R' U' R U2 L' U R'

One cancled move

If I did not know the solution for the previous round this would have been much harder to figure.

 

[Sebastien]

This is what I did with that (and I'd really be interested if anyone of you can find a better ending):

Did noone try it?

 

[Pyjam]

I found nothing better, and I'm hoping myself for an answer.

 

[Mirek]

Did noone try it?

I tried shortly and no luck.

 

[okayama]

Scramble = B2 L' F2 L2 B2 R D2 R2 B2 U2 F D B F2 L F' U L' B2 F2

I found this incredible start :

Pre-scramble : U F' (2)
Start : L' U' D L' (6)

This build a 2x2x3 block and 3 pairs. Too bad, it doesn't prepare the coffee too.

After this, I switched to the reverse scramble.

Pre-scramble : L D' U L (4)
F @ U' : (6) 2x2x3 block + 3 pairs
L' D L2 B L' D2 : (12) F2L -1 slot
x' U B U' B' R' U' R U2 : (20) All but 3 corners.

At @ insert (R2 U' L U R2 U' L' U) : (25) 3 moves cancelled.

Solution for reverse scramble:
F R2 U' L U R2 U' L2 D L2 B L' D2 B D B' D' R' B' R B2 L D' U L

I wonder if there is a better continuation after the first 6 moves.
Waiting for your analysis. Thanks.

Pre-scramble: L B' U F'

Pseudo 2x2x3 block: L' U' D L' (your start)
F2L minus 1 slot: B2 D2 L B' L2
All but 3 corners: D2 B' D B
Correction: L B' U F'

Too lazy to find an insertion.

 

[Pyjam]

Pre-scramble: L B' U F'

Pseudo 2x2x3 block: L' U' D L' (your start)
F2L minus 1 slot: B2 D2 L B' L2
All but 3 corners: D2 B' D B
Correction: L B' U F'

Too lazy to find an insertion.

Great news. A fantastic insertion can be done in the premove. Let's see:

Your solution : L' U' D L' B2 D2 L B' L2 D2 B' D B L @ B' U F'
At @ insert : (B U F' U' B2 U F' U' B) : +9 moves but 6 moves cancelled in the end !

So, this is the 20-move solution for reverse scramble :
L' D U' L' B2 D2 L B' L2 D2 B' D B L B U F' U' B2 U

Awesome ! Many thanks.