[Help Thread] FMC Discussion

[Cubenovice]

FMC-Scramble from SH Open 2013 (today): R' D2 F2 L' U2 R U2 F2 U F D2 B F2 U2 F' L R2 F' R'

Nice start: F L' B' U2 B' D2

I found the easy L5C in 14 moves.

Silly alternative:
your start - 6
L' U' L2 U2 L U B' - 13 leaves a corner cycle plus 2C2E

 

[uesyuu]

FMC-Scramble from SH Open 2013 (today): R' D2 F2 L' U2 R U2 F2 U F D2 B F2 U2 F' L R2 F' R'

Nice start: F L' B' U2 B' D2

Premove: B'
L U L2 U L' U2 L' B L B' L U' L' // L3C

So long...

 

[CubeRoots]

FMC-Scramble from SH Open 2013 (today): R' D2 F2 L' U2 R U2 F2 U F D2 B F2 U2 F' L R2 F' R'

Nice start: F L' B' U2 B' D2

Can someone find a really good finish? It reminds me a lot of Okayama's start on his WR Solve.

My finish:

Spoiler

F2L: L U L2 U L' U2 L U' L' B'
ZBLL: B2 D F' L2 F D' B' U2 B' U2

Solution: F L' B' U2 B' D2 L U L2 U L' U2 L U' L' B D F' L2 F D' B' U2 B' U2

25 moves.

F L' B' U2 B' D2 L U L2 U2 L' U B' U' gives L5C in 14 but doesn't cancel much (26 is optimal).

F' U2 B2 R F2 B' L' U D L2 D' L R' U2 R' F R F' R gives L3C in 19 but this does also result in 25 moves...

after spamming many ways to do f2l-1+eo i found this after your start: L B' U B L2 U2 F' L F L2 U2 B' U2 which leaves 3 corners. which is OK depending on cancellations. Turns out this doesn't cancel much either I could only cancel 1 move though IF says you can cancel 2 to get a 25 move solution.

 

[sneze2r]

FM from Grudziądz Open, 2-nd scramble:
R B2 R F2 R2 B' R2 U' B D' R D2 B U2 B L2 F2 L2 F2 U2

I found short 2x2x3 in 5 minutes:
y B' R F R2 F D'(6)

then i tried to do a xxx-cross by y R' F' R F, but then i couldn't finish LL nicely, so i decided to do

xxxcross+EOLL:
y U2 F' U' F' U F2(6/12)
F2l:
U' R U2 R' U R U' R'(8/20)
OLL+AUF:
L U L' U L U2 L' U'(8/28)

little bit lucky, but i don' care

 

[Meneghetti]

FM from Grudziądz Open, 2-nd scramble:
R B2 R F2 R2 B' R2 U' B D' R D2 B U2 B L2 F2 L2 F2 U2

I found short 2x2x3 in 5 minutes:
y B' R F R2 F D'(6)

then i tried to do a xxx-cross by y R' F' R F, but then i couldn't finish LL nicely

congrats on your solve!
I found an interesting continuation for your R' F' R F xxx-cross thing, which gives L4C in 18 moves, resulting in a total of 26 moves, using the optimal insertions

L' B R B2 R D' // your 2x2x3
L' B' L B // your xxx-cross
B' U B L U L' U L U' L' // AB4C

 

[okayama]

FMC-Scramble from SH Open 2013 (today): R' D2 F2 L' U2 R U2 F2 U F D2 B F2 U2 F' L R2 F' R'

Nice start: F L' B' U2 B' D2

Can someone find a really good finish? It reminds me a lot of Okayama's start on his WR Solve.

My finish:

Spoiler

F2L: L U L2 U L' U2 L U' L' B'
ZBLL: B2 D F' L2 F D' B' U2 B' U2

Solution: F L' B' U2 B' D2 L U L2 U L' U2 L U' L' B D F' L2 F D' B' U2 B' U2

25 moves.

F L' B' U2 B' D2 L U L2 U2 L' U B' U' gives L5C in 14 but doesn't cancel much (26 is optimal).

F' U2 B2 R F2 B' L' U D L2 D' L R' U2 R' F R F' R gives L3C in 19 but this does also result in 25 moves...

I got exactly the same solution as yours (25-move).
This was the best I could do in 1-hour.


Another attempt after 1-hour:

(Inverse)
Pre-scramble: L' F

1st square: U L' D2
2nd square: R' U B
3rd square: L'
F2L minus 1 slot: U2 L' B *
All but 5 corners: D2 L' D2 L
Correction: L' F
Corner 3-cycle: F' D F U F' D' F U'

Insert at *: L U L' D2 L U' L' D2

24 moves in total.


Yet another attempt:

(Normal)
Pre-scramble: L

2x2x1 block: F' U2
2x2x2 block: B2 * R F2
More square: L2 [@1] B'
More square: U2 L' B2
All but 4 corners: R' U' R
Correction: L

Insert at the beginning: D F' U' F D' F' U F
Insert at *: F L2 F' R F L2 F' R'

which also results in 24 moves. But IF says the optimal insertion is:

Insert at @1: L B' D R2 D' B L' B' D R2 D' B = [L, B' D R2 D' B]

which results in 23 moves.

 

[kinch2002]

D' B2 U L2 B2 L2 U2 L2 D' L2 D' L D' R' D' L' R U
^^It's a nice scramble
Here are 4 solves. I think it's all mine apart from Rob Yau's ZBLL

Anyone care to do better?

Normal scramble with premove L'
2x2x3: D L U' L2 U' R D2 (7+1)
Leave 4 corners: L U' L' U' L U' L' (14)
Double insertion gives 23 moves

Normal scramble with premove L'
2x2x3: D L U' L2 U' R D2 (7+1)
Leave 3 corners: U2 L U L' U L U L' U2 (17)
Insertion gives 24 moves

Inverse scramble with premoves L' D2 R' U L2 U L' D'
F2L: L U2 L (11)
ZBLL: R2 D R' U R D' R2' U R U2 R' U (24)
24 moves

Inverse scramble with premoves L' D2 R' U L2 U L' D'
F2L leaving 4 corners: L2 U L' U L U (14)
Double insertion gives 23 moves

 

[elrog]

I wasn't sure whether I should post this here or in the BLD section, but I wanted to know if anyone has ever done a FMC BLD solve. In other words, you come up with a solution in the fewest moves that you can without doing any turns on the cube.

 

[AndersB]

B D2 B' D2 L2 F' L' D F L U2 B2 D2 B U2 D2 L2 F R2

z2 R U2 L U2 L2 // 2x2
R U F2 U F R' B U' B' U F2 // XXX-Cross
U' F U F' U2 F R U' R' F2 // F2L + Forced OLL-skip
U B' U2 F U' F' U2 F B U' // PLL

36 HTM

Interesting scramble, I did this at the Swedish championship. Can you find a better continuation to that start?

 

[kinch2002]

You could have cancelled F2L into optimal L perm: F2 L' U' L F2 R' D R' D' R2

 

[Iggy]

FMC from this week's Weekly Comp (still running)

Spoiler

Scramble: L2 U F2 L2 D2 F2 L2 D R2 B2 D B' D' B2 D F2 R' U2 B2 F2

2x2x2: L' D2 F @1 L2 D L' U L
F2L-1: U' R2 B U' B U B' L' B' L
All edges: F' U' F U R U2 R' @2 U'

@1 = F' D2 F U2 F' D2 F U2
@2 = R U' L' U R' U' L

Final solution: L' F U2 F' D2 F U2 L2 D L' U L U' R2 B U' B U B' L' B' L F' U' F U R U L' U R' U' L U' (34)

Good for me. Tips?

 

[Sebastien]

Thanks to everyone who looked into the scrmable from SH Open 2013. I'm happy I didn't miss any obvious great solution.

A new challenge:

1st scramble from this week's German forum competition: U' L B L' U' L B U' R L2 F2 D' R2 U' F2 B2 R2 F2 D

EO+1x2x2 on inverse: F R2 F'

I absolutely failed to find a decent continuation, always ended up having parity. Is anyone willing to look into this?

 

[Brest]

R' B2 F R2 F' // premoves (2x2x2)
U' L B L' U' L B U' R L2 F2 D' R2 U' F2 B2 R2 F2 D // scramble

F' U' L D' L' U // 2x2x3
L' F' L // EO & 2 pairs

end:
F D' F' D' F2 D F' // leaves 2 twist (IF gives 28)
or
F D2 F2 U F' D F U' F' // leaves 2e2c (insert?)
or
F D2 F D2 F D' F D F2 D2 F2 D F D' F D F // SuneLL (32 moves lol)

 

[okayama]

D' B2 U L2 B2 L2 U2 L2 D' L2 D' L D' R' D' L' R U
^^It's a nice scramble
Here are 4 solves. I think it's all mine apart from Rob Yau's ZBLL

Anyone care to do better?

Normal scramble with premove L'
2x2x3: D L U' L2 U' R D2 (7+1)
Leave 4 corners: L U' L' U' L U' L' (14)
Double insertion gives 23 moves

Normal scramble with premove L'
2x2x3: D L U' L2 U' R D2 (7+1)
Leave 3 corners: U2 L U L' U L U L' U2 (17)
Insertion gives 24 moves

Inverse scramble with premoves L' D2 R' U L2 U L' D'
F2L: L U2 L (11)
ZBLL: R2 D R' U R D' R2' U R U2 R' U (24)
24 moves

Inverse scramble with premoves L' D2 R' U L2 U L' D'
F2L leaving 4 corners: L2 U L' U L U (14)
Double insertion gives 23 moves

My 1-hour solve:

[1] U' R2 U B2 D2 B2 U' L' U L B2 D L2 D' L' D L' D' U' L2 U L2 D F2 (24 moves)

Spoiler

Pre-scramble: U' L2 U L2 D F2

2x2x2 block: U' R2 U
2x2x3 block: B2
F2L minus 1 slot: D2
Finish F2L: B2 U' L' U L B2
LL: D L2 D' L' D L' D'
Correction: U' L2 U L2 D F2

[2] U' R2 U B2 L' U' L D2 L' U L B2 U' L' U L B2 U' D L' U L F2 (23 moves)

Spoiler

Pre-scramble: U' L' U L D F2

2x2x2 block: U' R2 U
2x2x3 block: B2 +
F2L minus 1 slot: D2
All but 2 twisted corners: B2 U' L' U L B2
Correction: U' L' U L D * F2

Insert at *: D' L' U' L D L' U L (free insertion!)
Insert at +: L' U' L D2 L' U L D2

After 1-hour:

[3] B2 D2 L D L U2 F2 L' D' L U2 L' D L R U' L2 U R' U' F2 U (22 moves)

Spoiler

Pre-scramble: F2 U

2x2x2 block: B2 D'
More square: D' L D L
More square: U2
All but 5 corners: F2 U L2
Corner 3-cycle: L2 U * R U' L2 U R' U'
Correction: F2 U

Insert at *: U2 L' D' L U2 L' D L

 

[Robert-Y]

I'm not sure if this is significant but I've noticed that your solutions preserve EO with every move.

 

[Cubenovice]

I'm not sure if this is significant but I've noticed that your solutions preserve EO with every move.

For a scramble with all edges oriented this seems a logical approach for getting a short solution

 

[coldsun0630]

My 1-hour solve:
[/spoiler]

Wow...
How do you find these pre-scrambles?
I want to learn how to do the premoves...

 

[okayama]

My 1-hour solve:

Wow...
How do you find these pre-scrambles?
I want to learn how to do the premoves...

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

I found those premoves basically with NISS.
Firstly, I found the following start on the normal scramble:

Pseudo 2x2x2 block: U' R2 U
Pseudo 2x2x3 block: B2 D2

Using the start, I considered the inverse scramble as follows:

(Inverse)
Pre-scramble: D2 B2 U' R2 U

2x2x2 block: F2
2x2x3 block: D'

Then I found two continuations:

[1] F2L minus 1 slot: L2 U' L2 U
[2] F2L minus 1 slot: L' U' L U

These gave me two options for premoves on the normal scramble:

[1] Pre-scramble: U' L2 U L2 D F2
[2] Pre-scramble: U' L' U L D F2

Using those premoves, I found the submitted two solutions.

 

[coldsun0630]

Using those premoves, I found the submitted two solutions.

Using many pseudo blocks were impressive!
...and may I ask you how to find the 'good start' with premoves?
like the 3rd solution or FMC R465.

 

[okayama]

Using those premoves, I found the submitted two solutions.

Using many pseudo blocks were impressive!
...and may I ask you how to find the 'good start' with premoves?
like the 3rd solution or FMC R464.

Trial & error with the help of NISS (and my experience, which is quite hard to explain).
For example, on FMC 465/classic (your URL points not 464, but 465), U makes two c/e
pairs on the normal scramble, which gave me a big hint of the premoves used in the
submitted solution.