The reconstruction thread

Discussion in 'General Speedcubing Discussion' started by qqwref, May 4, 2011.

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  1. qqwref

    qqwref Member

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    I figured it would be useful to have a megathread for this. We can post requests for reconstructions (of WR solves and the like), cool reconstructions we've done, techniques, and so on.

    A few useful links to start off with:
    - Lucas Garron's reconstruction index
    - Cube Explorer to track stickers when you don't have a scramble
    - alg.garron.us to make sure your sequence solves the puzzle
     
  2. Kirjava

    Kirjava Colourful

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    Do 22.95 already, I've been bugging lucas to do it forever.

    We have the scramble and a higher quality video ***.
     
  3. qqwref

    qqwref Member

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  4. Kirjava

    Kirjava Colourful

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    U L2 D' B2 U' R2 B2 F2 D' F2 L2 R2 F R2 D L2 R2 B' L' D' R F' for the scramble, I'll pm you the vid for bandwidth purposes
     
  5. qqwref

    qqwref Member

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    It took an lot of work and trial/error (even the high quality video was pretty grainy/blurry on the cube section, and there were reflections on the stickers, and fingers and subtitles in the way), but:

    scramble: U L2 D' B2 U' R2 B2 F2 D' F2 L2 R2 F R2 D L2 R2 B' L' D' R F'

    inspection: x2 y
    FL corners + 1 edge: D' R u D R' y' D' R D R'
    FL center + 2nd edge: y D r' E' L
    CLL: z2 U y l D R' z' R' x z' r' R2 U2 z D R2 D2
    FL 3rd edge: R' l' z M D2 M'
    LL 1st edge: z2 y R z' M z R'
    LL 2nd edge: z' r' L' z D R' E R
    LL 3rd edge: U' u' R E' R'
    LSE hax: u R' E' R E2 R E R'
    centers: R2 E E' r2 E M2 E'

    52ish slice moves = 2.26 tps

    http://alg.garron.us/?alg=x2_y D-_R..._B2_F2_D-_F2_L2_R2_F_R2_D_L2_R2_B-_L-_D-_R_F-
     
    Luke8 likes this.
  6. antoineccantin

    antoineccantin Member

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    What method did he use?
     
  7. qqwref

    qqwref Member

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    As far as I can tell the method is roughly:
    - first layer corners and then center, try to add in an edge if you see it
    - last layer corners in one step
    - insert first layer edges until 3 are done
    - use the keyhole in the first layer to insert 3 last layer edges
    - solve the last 6 edges and centers (not sure what his strategy here is)
     
  8. DavidWoner

    DavidWoner The Punchmaster

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    I would guess he was just trying to solve the two remaining edges in each layer, and he just got an easy E-slice case.
     
  9. Kirjava

    Kirjava Colourful

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    This is awesome, thanks a lot for doing it.

    Equivalent to F U R U' R' F' y R2 U2 R U2 R2

    pretty damn cool

    I agree. The 'LSE hax' is a Roux trick for solving UL/UR edges and orientation in one, but I think it's unlikely he used the orient -> permute technique and he probably just did UL/UR then midges.

    You could always reconstruct his other solves for more info :p
     
  10. qqwref

    qqwref Member

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    Feliks's 2.12 WR average on 2x2:

    1. 2.38 U2 F' U2 F U2 R' F R' U'
    inspection: x' z2
    FL: R' U R U' R' U
    CLL: R U2 R' U' R U' R'

    2. 1.77 U' F' U2 F2 U' F R' F2 U
    inspection: y'
    FF: R' U' R2 U'
    EG2: R U' L' U R' U' R' U2 R2

    3. (1.75) U2 R' F' R U2 R F2 R2
    inspection: y x
    FL: R' U R2 U R2'
    CLL: F R U R' U' R U R' U' F' U

    4. 2.21 U' F' U R F2 U' F R2 F'
    inspection: x y
    FL: U' L' U R U' R' L' U L
    CLL: U2' R U R' U R U' R' R U' R'

    5. (2.46) R2 U R U F2 U2 R2 F'
    inspection: y'
    FL: R U2 R' U R U' R' U
    CLL: U' R U' R' U2 R L U' R' U L' U'

    Yeahhhhh no thanks.
     
    Last edited: May 5, 2011
  11. JLarsen

    JLarsen Premium Member

    Damn that's impressive. Nice work. How do you go about doing this? My best guess would be;

    1. Track solution from video (ouch)

    2. Reverse solution to find scramble

    3. Generate optimal scramble for that position

    4. Profit?
     
  12. qqwref

    qqwref Member

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    More or less that. I use Cube Explorer and fill in stickers on an empty cube until I know enough. I always try to find as much of the initial scramble as possible, but sometimes I can't get it all from the start. In that case I'll play along with a real cube and see if any previously unknown stickers come into view as the solution is executed. Once I have the starting state (and, if it's 2x2 or 3x3, a scramble to go with it), I can watch what's going on and do moves on my own cube to try to match what I can see at any given time. It's not always possible to figure out what moves are being done just by watching the hands and cube twist.
     
  13. JLarsen

    JLarsen Premium Member

    Jesus that sounds tedious. How long did it take you to do that 4x4 reconstruction??
     
  14. qqwref

    qqwref Member

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    Didn't time it, unfortunately. Maybe an hour? It definitely went faster than the Minh Thai one.
     
  15. DavidWoner

    DavidWoner The Punchmaster

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    Reconstruction of Giovanni's 7.75 fullstep NR

    I'd like to see a reconstruction of Piti's 7.68.
     
  16. qqwref

    qqwref Member

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    Got Piti's solve. Neither of the vids had a good enough view of the scrambled cube, so it took a few tries to get the right scramble.

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

    inspection: y' x'
    cross: r' F' D
    F2L1: U' R' U' R2 U R'
    F2L2: U R' U2 R U R' U2 R
    F2L3: y' U y' U R' U' R y U' L' U L
    F2L4: U' R U2 R' U2 R U' R'
    OLL: R' U' F U R U' R' F' R
    PLL: U' R2 U R U R' U' R' U' R' U R' U

    54 moves (canceled) / 7.68 = 7.03 tps
     
  17. qqwref

    qqwref Member

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    I'd like to request a reconstruction of Bingliang's 8.65 solve. I tried but didn't have much success.
     
  18. DavidWoner

    DavidWoner The Punchmaster

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    I'll give it a shot on sunday when I have more time.
     
  19. y235

    y235 Member

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    Can someone please give me a reconstruction of Simon's Megaminx WR?
     
  20. hr.mohr

    hr.mohr Member

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    A megaminx reconstruction will be quite hard to do. In this case we have the scramble, but who can really say if it was scrambled correctly. The notation will also be a b*tch to do.

    The scramble was either:
    or

    As I can't remember which group Simon was in in the final.
     
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