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Invertible PBL Algs

Discussion in 'How-to's, Guides, etc.' started by emcowlbeck, Jul 11, 2018.

  1. emcowlbeck

    emcowlbeck Member

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    Mar 26, 2015
    WCA:
    2014COWL01
    Hi! So I use the Ortega method, and when I solve my first side, I orient my bar (assuming there is one) in the back). The worst case is when the top layer gets a skip and I have to do the following gross algorithm:

    D R’ U’ R’ F’ R U R’ U’ R’ F R2 U’ R’ U’ R2 U’

    You guys have any better solutions?
     
  2. mark49152

    mark49152 Super Moderator Staff Member

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    Oct 29, 2012
    UK
    WCA:
    2015RIVE05
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    mark49152
  3. emcowlbeck

    emcowlbeck Member

    3
    0
    Mar 26, 2015
    WCA:
    2014COWL01
    Thanks, but the case I’m talking about it a permuted top layer with a t perm on the bottom. I’ll already averaging about 4.5 seconds on 2x2, but when this case comes up, I either have to do cube rotations or a really slow alg.
     
  4. DGCubes

    DGCubes Member

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    1,120
    Feb 14, 2014
    Over there
    WCA:
    2013GOOD01
    YouTube:
    DGCubes
    You can do R2 T-perm R2 with the unsolved pieces on the right.
     
  5. emcowlbeck

    emcowlbeck Member

    3
    0
    Mar 26, 2015
    WCA:
    2014COWL01
    The algorithm I’m using now is a J-Perm with the R2 and R canceling out to an R’. The case is in the front though so the D-move is really annoying.
     
  6. Solvador Cubi

    Solvador Cubi Member

    106
    24
    May 4, 2016
    USA
    Are you talking about the case that would be solved with this alg?

    F2 (R U' L U2 R' U R U2 R' L') U F2

    this moves the 2 D corners to swap to U, then J-Perm, then back to D.
    12 moves instead of 17.


    -= Solvador Cubi
     
  7. This is just a bad case.

    You could try predicting when the top layer is going to skip, and orienting the bar differently so that you have a better PBL. You could also learn alternate algs for the top OLL to force not-skips.
     

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