New FMC-ER at BW Open 2013

[mycube]

Moritz Karl solved the cube in 21 Moves at the BW Open 2013. NR, ER and secound person in FMC in the world!

 

[kunparekh18]

Amazing!

Sent from my A75 using Tapatalk 2

 

[Username]

Nice! Congrats!

 

[applemobile]

Reconstruction?

 

[JianhanC]

Jimmy Coll's record finally broken, congrats!

 

[Cubenovice]

Whauk!

Congratulations!

Looking forward to the solution!

 

[Iggy]

Congrats!

 

[antoineccantin]

lolwat

I didn't know Whauk was good at FMC... Was it really lucky?

 

[Cubenovice]

I didn't know Whauk was good at FMC... Was it really lucky?

I know from the weekly FMC comp in the German forum that he knows NISS, Insertions and some ZBLL. He has multiple sub 30 solutions there.
Looking forward to the solution, I hope there are some "real" FMC techniques in it.

 

[cxinlee]

Wow! This may get me interested in FMC.

 

[mycube]

And here his solution: kind of lucky but not really undeserved, too.
Scramble: F' U2 L' D L F' L' B D2 B2 R F2 L' B2 R' L2 D2 R' U2

Start on Normal:
Double X-Cross: R2 U' B D2 B' D' L' B D'
Switch to inverse:
F2L-1: F R F' D' R2 D
Finish/LL-Skip: R' U' B U' B' U2

Solution: R2 U' B D2 B' D' L' B D' U2 B U B' U R D' R2 D F R' F' - 21 Moves

 

[Username]

How do you switch to inverse?

 

[JasonK]

How do you switch to inverse?

Perform the inverse of your solution thus far, then perform the inverse scramble.

So in that example you would do (on a solved cube): D B' L D B D2 B' U R2, then the inverse scramble.

 

[antoineccantin]

Perform the inverse of your solution thus far, then perform the inverse scramble.

So in that example you would do (on a solved cube): D B' L D B D2 B' U R2, then the inverse scramble.

I thought the solution were not supposed to have anything to do with the scramble?

 

[Cubenovice]

Nice scramble!

Clearly some effort was put into it (not staying with the 2x2x2 and the switch)

here's what I got straight of the 2x2x3 on the normal scramble:
R D' R2 D - F2L-1
F' U F U' - edge play
R2 U' R' U R2 - leaves 3 corners in 22 moves
too lazy for insertions

 

[JasonK]

I thought the solution were not supposed to have anything to do with the scramble?

That's correct. How does it?

 

[antoineccantin]

That's correct. How does it?

If you perform the inverse of the scramble...

 

[JasonK]

If you perform the inverse of the scramble...

...you get an extra place to work from in finding a solution. Solution still isn't related to the scramble.

 

[Renslay]

I thought the solution were not supposed to have anything to do with the scramble?

It doesn't. The scramble is just a "black box", it does a permutation on the cubies. But every permutation has a direct inverse (see the so called "cube group" in group theory), and you can clearly build up a solution for the inverse just as well.

With other words: if I change the given scramle to another one, which contains 200 moves, but does the same on the cube, it would not effected the solution and the way it has been found.

EDIT: for example, let's say in the competition they give just the scrabled cube - but not the scrabling itself. You search for a longer solution (for example, naive CFOP with 50-60 moves), write it down, and use it as your new scrambling algorithm. Of course you can still use its inverse. And again, the winner would came up with the same solution as above, with 21 moves. And the original scrabling would not even known - but that just not change anything.

The reason why they don't do this actually in a competition, and give you a relatively short scrambling, is because it would take more time to figure out a scrabling for yourself, or using your way too long (50-60 moves) scrambling. Unnecessarily. A competitor usually do many scrambling during that one hour.

Again: 20 moves of scrable = 21 moves of solution. 200 moves of scramble = 21 moves of solution. Unknown scramble = 21 moves of solution. The only difference is how much time would it take to find that solution.

 

[Forte]

With other words: if I change the given scramle to another one, which contains 200 moves, but does the same on the cube, it would not effected the solution and the way it has been found.

Oh snap, this is an awesome way of explaining it

Also nice ER Whauk!