[Help Thread] FMC Discussion

[okayama]

D' B D F L2 D' R' B R B' D2 F2 U2 L2 F2 L' D2 B2 R

D F2 R F2 B' L F'
D' B' D2 B2 D2 B' D' B2

Anybody have a nice finish?

Couldn't find any good finish for your start but I found a great start to that scramble

Premove F2

2x2x3 - D F

Pre-scramble: U F2

2x2x3 block: D F
Finish F2L: U2 L' B' L2 U2 L' B' U'
All but 3 edges: B' U B U' B U [@1] B2 U'
Correction: U F2

Insert at @1: E' F R F' E F R' F' (or E' F' R F E F' R' F) gives 25-move (according to IF).

Not so good for 3-move 2x2x3 block though...

 

[dbax0999]

Hey guys!

I built a site for a new weekly FMC competition. You can check it out here. I know there's the weekly competition on the German forums but maybe this could be something a bit more accessible that we could use while waiting for fmc.mustcube.net to come back up.

http://www.ocf.berkeley.edu/~dadams/fmc/

It's still in beta, so any suggestions are welcome! Feel free to leave a comment, pm me here, or submit an issue on Github.

Cheers,

David

 

[irontwig]

A picture of the scramble would be nice, and a place for comments is absolutely needed.

 

[dbax0999]

A picture of the scramble would be nice, and a place for comments is absolutely needed.

Submissions now have a place for comments. As far as a picture of the scramble, I'm not sure the best method for automatically generating a photo of a cube given a scramble. For now there's a link to alg.cubing.net on the submit page that has a link to the scramble.

 

[uesyuu]

Is there any Web sites to explain L4C or L5C Insertion?
It's hard for me to find almost optimal insertion efficiently.

 

[irontwig]

Is there any Web sites to explain L4C or L5C Insertion?
It's hard for me to find almost optimal insertion efficiently.

Just do (one of) the insertions that cancels the most moves and leaves three corners first and then just do what you would do for L3C. Optimal/almost optimal most of the time.

 

[TheDubDubJr]

Walker Welch NAR Mean 33.67

Walker Welch NAR Mean 33.67
[34 , 36 , 31]
I was happy with the single and I am glad I got a mean that represented what I averaged.

Spoiler: Attempt #1

Scramble - R2 U B2 L2 D R2 D F' L' R' B R2 U2 B R D' F2 L
(inverse - L' F2 D R' B' U2 R2 B' R L F D' R2 D' L2 B2 U' R2)

On normal:
U L' D // 2x2x2

Move to inverse:
(D' L U')premove (3)
F R2 F' L // 2x2x3 (7)
U F2 U' F' // F2L-3 (11)
R U R' F' U F U' R // -5 corners (19)

Skeleton on normal:
U L' D R' [@1] U F' U' F [@2] R U' R' F U F2 U' L' F R2 F'

@1 - U' F D F' U F D' F'
@2 - D' L2 D R2 D' L2 D R2
1 cancellation for 34 -_-

Final Solution - U L' D R' U' F D F' U F D' F' U F' U' F D' L2 D R2 D' L2 D R' U' R' F U F2 U' L' F R2 F' (34)

I had about 5min to find and write down these 2 insertions so I took whatever I could find.
I looked on IF and optimal insertions were a 27
I am guessing with more time I would have gotten about a 31

Spoiler: Attempt #2

Scramble - U' F2 D' L U R U R2 F L2 B U' B2 U2 D F2 R2 U2 F2 B2
(inverse - B2 F2 U2 R2 F2 D' U2 B2 U B' L2 F' R2 U' R' U' L' D F2 U)

On normal:
F R B' L F U' B L' B D2 // 2x2x3

Move to inverse:
(D2 B' L B' U F' L' B R' F')premove (10)
U L U' L' F' L2 F' L' F // F2L-3 (19)
D' L2 D L F L' F' L D' L2 D L2 // -3 corners (31)

Skeleton on normal:
F [@1] R B' L F U' B L' B D2 L2 D' L2 D L' F L F' L' D' L2 D F' L F L2 F L U L' U'

@1 - F L' F' R F L F' R'
3 cancellations for 36

Final Solution - F2 L' F' R F L F' B' L F U' B L' B D2 L2 D' L2 D L' F L F' L' D' L2 D F' L F L2 F L U L' U' (36)
the pizza helped with this attempt
I couldn't find a good ending with this start. I found this skeleton with about 5min left.
I again took whatever insertion I could get but was happy with the 3 cancellations.
IF says this is optimal for this skeleton
Steve Cho got a nice show of me speed-finishing my solution on the final paper with about half a second left.

Spoiler: Attempt #3

Scramble - F' R D' F L U' D L B' R' U2 F2 R2 F2 U' R2 L2 U' R2 U'
(inverse - U R2 U L2 R2 U F2 R2 F2 U2 R B L' D' U L' F' D R' F)

All on normal:
(U2)premove (1)
U2 F' D' B R2 D' // 2x2x2 (7)
F' U L2 F L // 2x2x3 + extra 2x2x1 (12)
R' F R U F L F L' // F2L (20)
R F R' F R F L' F R' F' L // COLL + EPLL skip (31)

Final Solution - U2 F' D' B R2 D' F' U L2 F L R' F R U F L F L' R F R' F R F L' F R' F' L U2 (31)

I found a 36 backup in the first 10min and found this 31 about 20min after.
I had a lot of options with that extra 2x2x1 after the 2x2x3 but I couldn't find anything better than a 31
#31club

#YearoftheWalker2014

 

[okayama]

Scrambles and my (bad) solves from Cherry Blossom Viewing 2014.

1st scramble: D2 U2 F2 D2 F2 L2 U2 B D2 F2 L D' B' U2 L R D2 U F2 R2
1st solution: U2 L B L' B2 D' R U F R F' R U' R' B' U F' U' B U F R U' R2 U' B' L U F D' (30 moves)

Spoiler

Using NISS, firstly I found the following short F2L (13 moves)

(Inverse)
Pre-scramble: D B2 L B' L' U2

F2L: D F' U' L' B2 U B'

but I couldn't find any good finish. Here is 25 min backup solution.

(Normal)
Pre-scramble: U' B' L U F D'

F2L minus 1 slot: U2 L B L' B2 D'
More square: R U
All but 3 corners: F R F' R U' R' * U R U' R2
Correction: U' B' L U F D'

Insert at *: B' U F' U' B U F U'

No better solution was found...

2nd scramble: B2 U R2 F2 R2 U' L2 D' L2 F2 D' R U' L' D' F D2 B' U2 R' D'
2nd solution: L U' F' D F U B2 R' B' R D' R' B2 L B' L' B2 R D' B D B U' B2 R B' R' U (DNF)

Spoiler

Stuck on the start for inverse scramble:

(Inverse)
2x2x2 block: U' R B R' B2 U

Simple continuation may be B2 L', but I couldn't find further continuation.

In the final 10 min., I decided to write some solution for normal scramble.

(Normal)
Pre-scramble: U' B2 R B' R' U

2x2x3 block: L U' F' D F U
F2L minus 1 slot: B2 R' B' R D'
All but 3 corners: R' B2 L B' L' B2 R D' B D B
Correction: U' B2 R B' R' U

but time was up here.

3rd scramble: B2 D2 B' L2 R2 B2 L B2 U R' F D2 L' B D U' B' R'
3rd solution: U F L F2 D' R' F2 R F' D2 B' L2 D L' D Bw2 D' L D Bw2 D2 B' L' B2 L' U' L' U B U2 F D (DNF)

Spoiler

Pre-scramble: U2 F D

1st square: (ready)
2nd square: U F L F2
3rd square: D' R' F2 R
Complete 2x2x3 block: F' D2
More square: B' L * B' L'
All but 2c2e: B2 L' U' L' U B
Correction: U2 F D

Insert at *: L (D L' D Bw2 D' L D Bw2 D2 L) L'

I wrote down this solution in the final few minutes to submit a backup solution, but it remained 2 twisted corners...

I believe the 1st scramble is nice, but 2nd and 3rd scrambles are hard.
Congrats to the winners, who could manage to find proper solutions!

 

[irontwig]

My second place average of 28 34 31= 31:

Spoiler

D' L' B L2 R U R' F B R U D R' U2 R D' R' U' B' U' R' U2 R U R' U R (28)
Premoves are R2 D':

D' L' B L2 [2x2x2+pairs]
R U R' F B R U R'.U B' [F2L]
U' R' U2 R U R' U R [Leaving three corners]

.=R D R' U2 R D' R' U2

20 minute solution, so a nice stress free start

Spoiler

F U' L' R' F2 D' B D' U R2 F' U' F U2 F' D' B2 D' F U F' D2 F U' D' B2 L' U L D2 L' U' L D2 (34)

F U' L' R' [EO]
F2 D' B D' U R2 F' U' F U2 D'.*[Leaving seven corners]

.=D F' D' B2 D:F D' B2
:=D2 F U F' D2 F U' F'
*=L'U L D2 L' U' L D2

I had pleny of time left (~30 minutes) when I found the skeleton, but I was really nervous (shaking) and kept on making silly mistakes, so the insertions are very far from optimal.

Spoiler

R' B U' B' R U L U' R' U L' F R' F2 R U F U2 F U L' B' U F' U' B' U F R F D (31)

On the inverse:
D' F' R' U' B2 L [2x2x2+pairs]

Switch to the normal scramble:
R' B U' B' [2x2x3]
U:F [Some random dancing around]
R' F2 R [EO]
U F U2 F U [Leaving four corners]
L' B2 U.R F D [Premoves]

.=U' B U F' U' B' U F
:=U' R U L U' R U L'

With two minutes left I saw I had a apostrophe missing (got a 2E2E+2C2C swap when I checked my solution), but managed to find the place and double check literally last-minute. Turns out I missed a better insertion at the dot; F L2 F' R F L2 F' R' would cancel four instead of three moves and result in a better second insertion for a 29 move total, gotta look more carefully for cancellations from the back.

Lesson learnt: Mean of 3 is really stressful (for me at least)

 

[porkynator]

My solves at BP Cube Day (27 26 32 = 28.33)

Scramble #1: L' D2 R U2 R2 B2 L2 F2 R2 B R B2 U L2 D2 L2 U L2 R2

Spoiler

Solution: F2 R' B' R F2 R' B R2 B2 R' L F' D L2 D' F2 L F L' F L2 B L' F' L B' L (27 HTM)

* R B2 R' //2x2x2 (3/3)
L F' D L2 D' //2x2x3 + 2x2x1 + 2x1x1 (5/8)
F2 L F //Tripod (3/11)
L' F L2 B L' F' L B' L //All but 3 corners (9/20)
* = F2 R' B' R F2 R' B R //3c (7/27)

Easy scramble; I've found this solution in 15 minutes I think. I found 2 other 27 moves solutons, one of which had all but 3 edges and 3 corners in 11 or 12 (I don't remember exacty) but terrible cancelations.

Scramble #2: B' L2 U2 R U D' R' U2 D' R2 B2 U2 B2 L2 F' D2 F L2 F' U2

Spoiler

Solution: D2 F R2 B' U' L U R2 U' L' U R' D2 F2 D' U L U' L' U L2 U' L F2 U B (26 HTM)

Using my notation for NISS (briefly explained: moves between brackets are done on inverse scramble)
D2 //2x1x1 (1/1)
(B' U') //2x2x1 (2/3)
F R2 B' * R D //2x2x3 + 2x1x1 (5/8)
D F2 D' //Pseudo F2L-1 (2/10)
(F2) //F2L-1 (1/11)
U L U' L' U L2 U' L //All but 3 corners (8/19)
* = U' L U R2 U' L' U R2 //3c (7/26)

I'm really surprised, the start wasn't so good.

Scramble #3: F2 R2 D F2 L2 D2 F2 D' R' B' D2 B' L B2 R2 U2 B' F L

Spoiler

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

Using my notation for NISS (briefly explained: moves between brackets are done on inverse scramble)
L R2 U2 //Pseudo 3x2x1 (3/3)
(R2 L2) //3x2x1 (2/5)
(F L F2 R' F B') //Pseudo 2x2x3 + 3 ce pairs (6/11)
F //Adjust pseudoness (1/12)
R' B' R D2
B2 D' B' D R D R' //All but 2c2e (11/23)
J-perm to finish (R B2...) (9/32)

Not a nice scramble in my opinion, so I'm happy with my 32 moves solution

Second in the world

 

[irontwig]

Nice job!

 

[porkynator]

Nice job!

Thanks
I've also rolled my avg100 to 29.74

 

[EMI]

Here is my second place 28 moves solution from yesterday.

Spoiler

Scramble (inverse solution):
R U F R' B R F' R' B D' B D' B' D2 B2 D B D2 R' B R2 D' R' F2 U' B' U2 R

(R U R') //1x2x2 (3/3)
R' U2 B U F2 // 2x2x3 (5/8)
R D R2 B' R // EO (5/13)
D2 B' // F2L-1 (2/15)
D' B2 D2 B D B' D B2 // F2L, 3C left (8/23)
Skeleton: R' U2 B U F2 R D R2 B' R D2 B' D' B2 D2 B D B' D B2 * R U' R'
* = [B, R F R']

 

[cubeaddicted]

Can we bring specific pieces, like just corner pieces, to a competition?

 

[TDM]

Can we bring specific pieces, like just corner pieces, to a competition?

You can bring 3 cubes, and it says nothing in the rules against disassembling them. I don't think you'd be able to take just a few pieces though, unless you have less than 3 cubes.

 

[Mikel]

Five Official 69 Move FMC Attempts

This video shows animations of 5/7 of my official FMC attempts. A version without audio is found here.

 

[TeddyKGB]

I couldn't take it, I had to mute my computer to watch this.

 

[Mikel]

I couldn't take it, I had to mute my computer to watch this.

A version without audio is found here.

Muting works too.

 

[pinser]

How can I decrease my LL move count?
My F2L takes ~20-30 moves, but then my LL of ~10-20 moves really kills my move count...

 

[Bindedsa]

How can I decrease my LL move count?
My F2L takes ~20-30 moves, but then my LL of ~10-20 moves really kills my move count...

20 moves is Gods number for LL. FMC with full LL isn't easy, try doing things during your F2L to influence your LL.