[Help Thread] FMC Discussion

[Username]

What exactly is FMC. It seems interesting. What is it? Can you get good at it? And do you practice it?
-IQubic

No it's impossible to get good at it

Spoiler: To mods

Delete this if you think it's rude

 

[IQubic]

Username, I meant what does the acronym of FMC stand for???

 

[Username]

Username, I meant what does the acronym of FMC stand for???

Fewest Moves Challenge

 

[IQubic]

I see, is that where you take a given scramble and try to get it solved in the least amount of moves?

 

[Username]

I see, is that where you take a given scramble and try to get it solved in the least amount of moves?

Yes

 

[ben1996123]

I see, is that where you take a given scramble and try to get it solved in the least amount of moves?

[wiki]FMC[/wiki]

 

[PM 1729]

3x3 FMC at Indian Cube Championship: DNF

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

Explanation:
2x2x3: U2 D' L' F D B U B' R B2 (10)

Switch to inverse with premoves: B2 R' B U' B' D' F' L D U2
On inverse: F2L-1: U' R2 U R2 (4/14)

Back to scramble with pre: R2 U' R2 U (4)
On scramble: F2L-1: U2 D' L' F D B U B' R B2 (10/14)
Leave 3 corners: B U2 B' U R' U' R2 U R' U R U2 R' U2 (14-1=13/27)

So skeleton is : U2 D' L' F D B U B' R B' U2 B' U R' U' R2 U R' U R U2 R' U2 R2 U' R2 U .
At . insert : U2 L' D L U2 L' D' L (8-1=7/34)

Spoiler

The circled move should be a U'.
:fp

 

[Brest]

Nice solution! Transcription DNFs are frustrating indeed.

I found a slightly better insertion:

U2 D' L' F D
B U B' R B'
U2 B' U R' U'
R2 U R' U R U2
R' (1) U2 R2 U' R2 U

(1) [R, B L' B']

All those <R,U> moves at the end make me suspect that there is a shorter solution. One of the many pros that frequent this thread might be able to find it!

 

[PM 1729]

Thanks! I ran it on IF and got a 33 optimal. So you found an optimal insertion. That being said, I too thought that the R Us will give more cancellations.

 

[kinch2002]

As Brest said the <R,U> part might have a better solution, I tried using the same start and found this:
Same start prior to the <R,U> part: U2 D' L' F D B U B' R B' U2 B'
Square: R' U R U R2
Another Square: U2 R U R' U'
Fix blocks to leave 3 corners: R2 U2
Cuts 3 moves off the skeleton. No time to insert - leaving for Vegas!

 

[MarcelP]

Does anyone know if a 2X2X3 block has a gods number? I alwayst try to find 2X2X3 BLOCK because it gives you multiple sides to continue on. But most of the times it takes me too much moves so that it looses all purpose. What move count for a 2x2x3 block should be OK for the solution to continue on?

 

[Goater]

Does anyone know if a 2X2X3 block has a gods number? I alwayst try to find 2X2X3 BLOCK because it gives you multiple sides to continue on. But most of the times it takes me too much moves so that it looses all purpose. What move count for a 2x2x3 block should be OK for the solution to continue on?

Check out this topic: http://www.speedsolving.com/forum/showthread.php?13578-Optimal-2x2x3-Humanly-possible
But still IMO, there shouldn't be any "always" in fewest moves methods... except for "always try to use various methods".

Guys, do you have FMC scrambles from Vegas?

 

[Jakube]

Follow the link. Here they claim that god's number for a 2x2x3 block is 11.
http://www.speedsolving.com/forum/s...parity-challenge&p=57721&viewfull=1#post57721

 

[MarcelP]

Check out this topic: http://www.speedsolving.com/forum/showthread.php?13578-Optimal-2x2x3-Humanly-possible
But still IMO, there shouldn't be any "always" in fewest moves methods... except for "always try to use various methods".

Thanks for the link. Yeah I know, with always I mean, I always start with finding a 2X2X3 block. And I almost never succeed

Follow the link. Here they claim that god's number for a 2x2x3 block is 11.
http://www.speedsolving.com/forum/s...parity-challenge&p=57721&viewfull=1#post57721

Ok, thanks!

 

[JackJ]

37 from Worlds (first attempt)

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

2x2x3: F2 U' F2 B' L2 R U R2 F2
pseudo F2L + OLL: R' B' R B R' U R U R2 F R F' R U2 R'
PLL: U B2 Uw B' U B' U' B Uw' B2 R' U R'

Found in ~30 minutes.

 

[Julian]

My two attempts at Worlds

Spoiler: 32

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

F2 U' F2 B' L2 // 2x2x2
R U R2 F U' F // 2x2x3 + pair
U R B' R' B R' // F2L-1
B U2 B' U B U B' // F2L
L' B' R B' R' B2 L U // LL

Spoiler: 33

(premoves D' B D') D' L2 R2 F2 D R2 D2 R D B2 F U' L B R F2 R2 D' U

F2 U2 B D' R // 2x2x2 + 2 pairs
L U D' B2 U' L2 D L2 B D' B' // F2L
U' . L' F' L F U L // L3C

Insert [F', L B L'] at . to cancel 1 move.

 

[Sebastien]

Eventually I got some time to post my 26 move solution placing second at WC2013, including the most exiting finishing moment I've ever had in my whole FMC career.

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

As already in WC2013's first attempt I had lots of bad luck with insertions for this scramble even though having some decent skeletons. Time passed by and at around 55:30 I decided to give the last shot on the following skeleton I had found on the inverse:

Some Blocks + some orientation: B R U' D F
6C3E: D B2 D' U2 R' U * L2
* = L B' D B L' B' D' B to get L4C

Skeleton: B R U' D F D B2 # D' U2 R' U L B' D B L' + B' D' B L2

Around 57:00 I found # = B2 D F' D' B2 D F D'
After restickering for pass 2 I found + = L B' R2 B L' B' R2 B at around 59:10.

Then I just rushed writing down the solution, inverting and taking into account the insertions and hoping for not messing this up. The call to put down the pens came within a second after I had written down the last move. I was absolutely shaking and exited while trying what I had written down right afterwards. I guess that you can imagine the relief that came over me when it worked.

 

[ottozing]

My 31 tied OcR from WC13

Spoiler: Solution

(Premoves L2 B) D' L2 R2 F2 D R2 D2 R D B2 F U' L B R F2 R2 D' U
F2 U2 B D' R (2x2x2)
L U B2 U' (2x2x3)
D B D B2 L2 B (EO+XXXcross)
L' D L (Finish F2L)
F D2 F' L' D F D F' D' L D2 (ZBLL)
L2 B (Undo Premoves)

A little bit lucky but still an OcR :3

 

[ben1996123]

okso ive started doing fmc abit but i still such at it

premove R2
L2 B R2 B' F2 U2 F' U2 R2 U2 L2 D' R' D L' R' D2 F L2 R2 F'
F B L' D R B
z2 U F L' U L
???
L2

notsure what to do next

halp ?

oarso found this which is kindof cool but disgusting

L2 B R2 B' F2 U2 F' U2 R2 U2 L2 D' R' D L' R' D2 F L2 R2 F'

F B L' D R B
z2 U F L' U L
R U' R' U2 R U' R' U2 R' F R F2 L2

 

[CubeRoots]

okso ive started doing fmc abit but i still such at it

premove R2
L2 B R2 B' F2 U2 F' U2 R2 U2 L2 D' R' D L' R' D2 F L2 R2 F'
F B L' D R B
z2 U F L' U L
???
L2

notsure what to do next

halp ?

oarso found this which is kindof cool but disgusting

L2 B R2 B' F2 U2 F' U2 R2 U2 L2 D' R' D L' R' D2 F L2 R2 F'

F B L' D R B
z2 U F L' U L
R U' R' U2 R U' R' U2 R' F R F2 L2

first one you could do F' L' B' U' B U2 L U to leave 5 corners, but sadly 1 is twisted... so not much use

F' U2 L' U2 B' U B L U' follows the same idea only it leaves 4 corners, 1 twist. so you could do a double insertion to finish.