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The FMC thread

Joined
Apr 2, 2017
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Pacifica, CA
There's now an instrumented cube available retail! This is a big deal for FMC and ease of use.

The Giiker Cube, a Bluetooth instrumented cube with an app that can follow it, is available as of August 2018 at speedcubeshop.com and thecubicle.us for $42 or so.

I've always been interested in variants of FMC, and of combined FMC and speedsolving. Instead of a written scramble and an hour, you could get a scrambled cube and five minutes to do a fewest-moves solve. Or, you could have a speedsolving competition where you're penalized N seconds per move, for various N, providing a smooth spectrum between FMC and speedsolving.

With a bit of straightforward software work (Lucas Garron has already connected the Giiker Cube with Chrome, see https://bluetooth.cubing.net/ ) we'll be able to try out FMC variants like this, with fairly easy logistics and no custom hardware. Sweet!
 

AvGalen

Premium Member
Joined
Jul 6, 2006
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Rotterdam (actually Capelle aan den IJssel), the N
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2006GALE01
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arnaudvg
There's now an instrumented cube available retail! This is a big deal for FMC and ease of use.

The Giiker Cube, a Bluetooth instrumented cube with an app that can follow it, is available as of August 2018 at speedcubeshop.com and thecubicle.us for $42 or so.

I've always been interested in variants of FMC, and of combined FMC and speedsolving. Instead of a written scramble and an hour, you could get a scrambled cube and five minutes to do a fewest-moves solve. Or, you could have a speedsolving competition where you're penalized N seconds per move, for various N, providing a smooth spectrum between FMC and speedsolving.

With a bit of straightforward software work (Lucas Garron has already connected the Giiker Cube with Chrome, see https://bluetooth.cubing.net/ ) we'll be able to try out FMC variants like this, with fairly easy logistics and no custom hardware. Sweet!
Lucas Garron showed me the Giiker Cube during Euro 2018 and we discussed a few ideas in very quick bursts. We both agree that theoretically this can revolutionize FMC, but for now I don't have any practical idea that could work. Cheating is an obvious issue (either by having a solver on your receiving device, or by sending the data to another person with the receiver). At the moment the only real use I could find for the Giiker Cube would be to have:
* (Unofficial) Online competitions that could be verified
* Great for statistics, gathering practice information
* Guaranteed correct scrambling
 
Joined
Feb 15, 2016
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2014MAUR06
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The Physicist Cuber
Weird 28 I got yesterday:

scramble: R' U' F B D2 L' D' L2 F' L2 B R' L2 U' B2 U D2 L2 F2 D2 B2 D2 B2 R' U' F

solution: R' L2 B U2 B L U F2 L' D2 L D2 R D' L' D R' L F R' D' R D F' D' F U2 B'

explanation:

R' L2 //1x1x3
B U2 B //"inner" 1x1x3
L //1x2x3 (so far 7 moves)

switch (the fun begins :) )

B U2 //pseudo-2x2x3 (premove=U') (basically 2x2x3 done in 9 moves)

now here it kinda looks terrible, so I tried randomly picking edges and corners to pair and got this:

F' D F //pair

now watch what happens when I do EO while preserving the pair I just made:

D' R' D R F' //EO+PSEUDO-F2L (premove=F2) (dafuq was that?!)

now we have solved F2L in 18 moves. Guess what case I got for LL?

L' R D' L D R' D2 L' D2 L //LL in 10 moves (which is actually just the COLL xD)

yeah, that was a really weird solve. PB is 27.
 
Joined
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2011TRON02
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PorkyDays
Today I did a solve worth sharing, in my opinion. What I like the most about it is that I have found a nice 24 in 10 minutes, but then I kept trying and I managed to improve it to a 22 first, and then to a 21.

Spoiler alert: German forum weekly competition, first scramble.


Scramble: R' U' F L2 B2 R2 B2 R2 D2 B' F' U' L D F R B' R' F R' D U' B2 R' U' F
Solution: B U2 R F L' R2 D' L' D L' F2 B2 R B2 U' F2 U B2 U' F2 L' (21)

I have found this start very quickly (2 minutes):

B * U2 R F //EO (4/4)
L' F2 B2 //Blocks (3/7)
L2 U' R' L' + //3c3e (4/11)

And I went for insertions right away:

* = B D B' U2 D2 F D' F' U2 D2 (7)
+ = R U2 R' D' R U2 R' D (6)

Then I tried other stuff, but I didn't find anything as good. An interesting "all but 8 corners" in 9 moves, but with 4 corner comms needed.
Then I went through my skeleton again to see if I could find something better, and I did:

B U2 R F //EO as before (4/4)
L' R D' R' //Different stuff (4/8)
F2 B2 //Blocks (2/10)
L U L U' R' L' //3c (6/16)

At this point I noticed something. My two skeletons shared not only the start, but also the last 3 moves (U' R' L'). So I decided to use them as premoves:

Premoves: U' R' L' (3/3)
B U2 R F //Same start (4/7)
L' R2 //All but 3 corners, 4 edges and 4 centers (2/2)

Edges and centers can be solved with setup + S2, which is actually what I did before. However, now I see that there is a better spot to do this and save one move:

B U2 R F L' R2 // (6/6)
D' L' R' //Premoves (pseudo centers change U to D) (3/9)
R D L' F2 B2 R * U' L' // = [R D L': S2], solves edges and centers, 2 moves cancel (6/15)

* = B2 U' F2 U B2 U' F2 U //Corner comm (6/21)
 
Joined
Sep 22, 2013
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UK
WCA
2013COPP01
tl;dr: what is parity in FMC?

I've sometimes seen people use the term "parity" in an FMC solve to refer to a skeleton (I think) where they end up with 2 edges unsolved (and some number of corners, presumably).

I'm wondering two things:

1. Is this an accepted definition?
2. Do we understand much about how this kind of parity works? The reason I'm asking is that I sometimes find I get to a point in a solve where things look very promising, but no matter what I do I always end up with 2 edges and some (>2) number of corners left to solve. Is this a real phenomenon, or am I just dreaming it...? For more background, I think this happens after an EO start.
 
Joined
Dec 24, 2015
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tl;dr: what is parity in FMC?

I've sometimes seen people use the term "parity" in an FMC solve to refer to a skeleton (I think) where they end up with 2 edges unsolved (and some number of corners, presumably).

I'm wondering two things:

1. Is this an accepted definition?
2. Do we understand much about how this kind of parity works? The reason I'm asking is that I sometimes find I get to a point in a solve where things look very promising, but no matter what I do I always end up with 2 edges and some (>2) number of corners left to solve. Is this a real phenomenon, or am I just dreaming it...? For more background, I think this happens after an EO start.
1. I mean, if everyone understands it, that's as "accepted" as it can be… (Also, two edges swapped, not merely unsolved. Cases with two edges flipped shouldn't be considered "parity", although they're just about as bad.)

2. If you do EO but not at the very beginning, you can usually do it in many different ways and end up with different edge permutations, some of which will have nice continuations and some of which don't. Conversely, if EO is done right at the start and you preserve it throughout, that limits the kinds of moves you can make and it's harder to influence EP. That said, I don't think this is a huge effect (if it's real at all), so it's probably all in your mind.
 
Joined
Aug 23, 2018
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Location
Surrey, England
WCA
2013SKEL01
I have found a fairly interesting skeleton from the weekly FMC scramble which uses keyhole, but unfortunately I couldn't get a solution out in time (always do a back-up solution!) so I want to post it here:

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

F' B2 R' // EO [3/3]
U B' F2 U' L2 // 2x2x2 + F2L edges -1 [5/8]
U D2 B' U' B // Keyhole [5/13]
D2 B' U2 B // AB4C [4/17]

IF gives 28 moves.

Also, is there any well known way to get faster at finding insertions?
 
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