[Help Thread] FMC Discussion

[AJ Blair]

My 27 move solution from this week's competition:

Spoiler

Scramble: D2 F2 U' R' D2 L' B' U' L2 F R B R' U' B' D2 U' L' U L'

Premove: L'
R F' U' F' //2x2x1 (4/4)
D2 U2 R' D F U //2x2x3 (6/10)
L2 //F2L-1 (1/11)
D' F' D' F D' L D L' //F2L (8-1/18)
L' F L2 B' L2 F' L2 B L' //PLL Skip (9-1/26)
L' //Undo Setup move (1/27)

The PLL skip was really lucky of course, as I found a solution with less than 10 minutes remaining. I didn't have the time to really search for anything better.

A 12 move F2L-1 is really nice though. So I was wondering if anyone else could try to find anything else off if it?

 

[TheDubDubJr]

If your skeleton is to two twisted corners, cancellations like this are somewhat common. In that case, it just means that you didn't see a different skeleton.

Have you got any examples of this? >8 moves, not 8 moves. I can see how 8 movers can be missed during the skeleton, although I think they're all quite possible to find still.

An Official example of one Kit was talking about. (only cancels 8-moves though) http://www.speedsolving.com/forum/showthread.php?13599-The-FMC-thread&p=1010875&viewfull=1#post1010875

The first insertion was at the start of the (inverse) skeleton so I don't think anyone would have seen that.
I think it really only gets stupid when the insertion that cancels a lot of moves is at the end of the skeleton.

 

[Prakhar]

I got a 9 move psuedo F2L-1 (10 with premove) and the final pair made on inverse. But no other edges oriented. I found a 27 mover.

Should I continue on it or find something else?

 

[Prakhar]

I do think Okayama has done a 8+ move cancellation once.

Edit, found it: http://www.speedsolving.com/forum/s...eekly-competition-2010-21&p=385945#post385945

Thanks. That was what I was talking about. This proves that insertions can sometimes make the solution shorter than the scramble.

 

[kinch2002]

Interesting! 9 move cancellation (it says 11 but 2 are nothing to do with the insertion). The reason you can't see this while forming the skeleton is due to the NISS, so that's something I didn't think of. But you should still see the final solution if you go through the linear skeleton, and look to finish the cube instead of just leave 3 corners

 

[guysensei1]

Where's the inserted commutator?

Oh dang, I thought it was just about most moves cancelled.

 

[Prakhar]

Scramble- R' F' U B2 U2 D' L U2 D B' U B2 U2 D F2 R2 D' B2 L2 U D2
Solution- L' U2 L' B2 U2 B F2 R F' U F U' F U' F U F L F' L' F2 U' F2 L' F' L U L' F L R2 U (32 HTM)

Spoiler

On Normal
L' U2 L' B2 U2 B //2x2x2 [6/6]

On Inverse
Pre scramble : B' U2 B2 L U2 L
U' R2 //Psuedo 2x2x3 [2/8]

On Normal
Pre Scramble: R2 U

F2 R F' U F' U' //F2L-1 [6/14]
F U' F U F L F' L' F2 U' F2 U //3 Blocks Left [12/26]
U' L' F' L U L' F L //Finish [8-2/32]
Correction: R2 U

Did this within 1 hour. Tips please.

 

[G2013]

With your scramble and your start I found a 31 moves solve in less than 5 minutes:
Scramble- R' F' U B2 U2 D' L U2 D B' U B2 U2 D F2 R2 D' B2 L2 U D2
On Normal
L' U2 L' B2 U2 B //2x2x2 [6/6]

On Inverse
Pre scramble : B' U2 B2 L U2 L
U' R2 //Psuedo 2x2x3 [2/8]
F R' F2 R F' R' //F2L-1
L F2 L' F L F L' //Last pair
x y R' U' F U R U' R' F' R /OLL
U' //PLL skip

Final solve: U' R2 F R' F2 R F' R' L F2 L' F L F L' x y R' U' F U R U' R' F' R U' y' x' B' U2 B2 L U2 L, so
U' R2 F R' F2 R F' R' L F2 L' F L F L' U' F' R F U F' U' R' U F' B' U2 B2 L U2 L,
but we need to invert it, so
L' U2 L' B2 U2 B F U' R U F U' F' R' F U L F' L' F' L F2 L' R F R' F2 R F' R2 U (31 HTM)

I can't give tips because I need tips... I'm working on improving my endings, and sometimes I find skips like the one above this sentence.

 

[okayama]

Scramble: D2 F2 U' R' D2 L' B' U' L2 F R B R' U' B' D2 U' L' U L' (Weekly FMC scramble 40)
Solution: B' U' D' R D' B2 D2 R D' R2 D2 R' D R' D' R2 B U B' D B U2 B' D' R2 U (26 moves)

Spoiler

Not special, but couldn't find within 1-hour.

(Inverse)
Pre-scramble: U B

2x2x1 block: U' R2
2x2x2 block: B U
Orient edges: B'

(Normal)
Pre-scramble: B U' B' R2 U

2x2x2 block: B' U'
2x2x3 block: D' R D' B2
Pseudo F2L minus 1 slot: D2 R D'
All but 3 corners: R2 D2 R' D R' D' R2
Correction: B U' * B' R2 U

Insert at *: U2 B' D B U2 B' D' B

 

[moralsh]

I'll update cubecomps tomorrow, but we've had a 27 average by Javier Cabezuelo today at Spanish championship, 26, 27 & 28. 5th in the world!

 

[Prakhar]

My PB solution to Weekly FMC scramble 40.
Scramble- D2 F2 U' R' D2 L' B' U' L2 F R B R' U' B' D2 U' L' U L'
Solution- R' B2 R B R B' R' B' R' B2 R2 U' B2 U B' F2 L B2 D' L D2 U' F2 (23 HTM)

Spoiler

On Inverse
F2 U D2 L' D B2 L' F2 //2x2x3 [8/8]
B U' B2 U //F2L-1 [4/12]
R2 B R B'+ R //L3E [5/17]

Insert at + - B R' B R B R B R' B' R' B2

Another start-
On inverse
Premove- B'
F2 U D2 L' B2 D L' F2 B2// F2L-1

First, I found a psuedo F2L-1 in 9 moves(10 including premove). But it left 0 edges oriented. So I continued to this. F2L-1 to L3E was pure luck. I did not use the optimal U perm or 6 move edge 3 cycle because there was no such case. Btw, insertions are optimal.

It is my PB. Previous was 27 HTM. Tips please.

 

[guysensei1]

My PB solution to Weekly FMC scramble 40.
Scramble- D2 F2 U' R' D2 L' B' U' L2 F R B R' U' B' D2 U' L' U L'
Solution- R' B2 R B R B' R' B' R' B2 R2 U' B2 U B' F2 L B2 D' L D2 U' F2 (23 HTM)

On Inverse
F2 U D2 L' D B2 L' F2 //2x2x3 [8/8]
B U' B2 U //F2L-1 [4/12]
R2 B R B'+ R //L3E [5/17]

Insert at + - B R' B R B R B R' B' R' B2

Another start-
On inverse
Premove- B'
F2 U D2 L' B2 D L' F2 B2// F2L-1

First, I found a psuedo F2L-1 in 9 moves(10 including premove). But it left 0 edges oriented. So I continued to this. F2L-1 to L3E was pure luck. I did not use the optimal U perm or 6 move edge 3 cycle because there was no such case. Btw, insertions are optimal.

It is my PB. Previous was 27 HTM. Tips please.

please spoiler the solution. Some people might not want to see other's solutions before trying the scramble!

 

[Kit Clement]

please spoiler the solution. Some people might not want to see other's solutions before trying the scramble!

I don't think it should matter much for last week's scramble.

 

[Coolster01]

FMC PB's!

29.000 Single.
32.000 Mean of 3. (29, 31, 36)
32.667 Average of 5. (35, 31, 34, 31, 33)
34.000 Average of 12. (29, 31, 36, 42, 34, 36, 30, 37, 36, 35, 31, 34)

I almost have an avg50, just need 8 more

 

[Prakhar]

please spoiler the solution. Some people might not want to see other's solutions before trying the scramble!

It does not matter much as many of them must have tried the scramble. But still, respecting you, I will spoiler it.

 

[G2013]

Week's challenge

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

Spoiler: Warning, too many letters

On brackets means on inverse
Solve:
F R2 F2 B2 //2x2x1+B2
(F U2) //2x2
(R D L R' B2) //2x2x3, Premove B2
(B D B' F L F') //EO
(L2 D L D L2 D) //Blocks
(D' L' D L' D' L2 D) //Sune

Skeleton: F R2 F2 B2 D' L2 D L D' L' D' L' D' L2 F L' F' B D' B R L' D' R' U2 F' (26 HTM)
Final solve: F R2 F2 B2 D' L2 D L D' L' D' L' D' L2 F L' F' B L2 D' R' D L2 D' R B R L' D' R' U2 F' (32 HTM, 2 cancellations)

Insertion finding:

Found insertions:
F R2 F2 (F U F' D2 F U' F' D2) B2 D' L2 D L D' L' D' L' D' L2 F L' F' B D' B R L' D' R' U2 F'
F R2 F2 B2 D' L2 D L D' L' D' L' D' L2 F L' F' B D' (D L2 D' R' D L2 D' R) B R L' D' R' U2 F'
F R2 F2 B2 D' L2 D L D' L' D' L' D' L2 F L' F' B D' B R L' D' (F L2 F' R' F L2 F' R) R' U2 F'
F R2 F2 B2 D' L2 D L D' L' D' L' D' L2 F L' F' B D' B R L' D' R' U2 (D B D' F D B' D' F') F'

Final solves:
F R2 F' U F' D2 F U' F' D2 B2 D' L2 D L D' L' D' L' D' L2 F L' F' B D' B R L' D' R' U2 F' (33)
F R2 F2 B2 D' L2 D L D' L' D' L' D' L2 F L' F' B L2 D' R' D L2 D' R B R L' D' R' U2 F' (32) --> The chosen
F R2 F2 B2 D' L2 D L D' L' D' L' D' L2 F L' F' B D' B R L' D' F L2 F' R' F L2 F' U2 F' (32)
F R2 F2 B2 D' L2 D L D' L' D' L' D' L2 F L' F' B D' B R L' D' R' U2 D B D' F D B' D' F2 (33)

 

[guysensei1]

How far do you think one can go with standard OLL/PLL for last layer?

Let's say that he can influence LL heavily and know multiple algs for each case to get cancellations, better cases and whatnot.

 

[Attila]

I'll update cubecomps tomorrow, but we've had a 27 average by Javier Cabezuelo today at Spanish championship, 26, 27 & 28. 5th in the world!

Congratz to Javier
Anyone can share these solves?

 

[guysensei1]

Just a decent (for my level) CFOP FMC solve. Was bored.
Scramble: U2 L2 B2 L2 U R2 U' F2 D' F2 D2 B' D L' U' L2 F2 L R F R'

U R F' B2//cross (4)
D R' D R D' R D R'//f2l pair (8)
L D' R' D' R//f2l pair (5)
L' D2 L D L'//f2l pair (5)
D B' L B L' B D2 B'//OLS (8)
B2 U R' D R' D' R U' B2 L' D L//PLL
Total: 41 moves CFOP. Lol

 

[dbax0999]

This has been brought to my attention a few times over the last two months so I thought I'd make a post in case other people are experiencing issues.

If you try to submit to the Weekly FMC and it says 'You have already submitted, please wait for next week's scramble', but you haven't submitted yet, then feel free to drop me a PM here or email me at dadams [at] berkeley [dot] edu with your Solution, Comments, and Username and I'll manually enter your submission.

Also to the person submitting CubeExplorer solutions every week, it's obviously not working and not going to work in the future.

- David