LSE

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LSE
Roux method.gif
Information
Proposer(s): Gilles Roux
Proposed: 2003
Alt Names: Last Six Edges, L6E
Variants: ELL, L5E, L7E
Subgroup: <M,U>
No. Algs: 0 (intuitive)
Avg Moves: 11.1 STM (optimal)
Purpose(s):
Previous state: 6 Edges missing UM cube state
Next state: Solved cube state

6 Edges missing UM cube state -> LSE step -> Solved cube state


The LSE step is the step between the 6 Edges missing UM cube state and the Solved cube state.

LSE, also called L6E, short for Last Six Edges, is a possible last step in 3x3 speedsolving that solves the M-slice centers and edges (UF, UB, DF, DB) together with UL and UR edges. It is the last step of the Roux Method and the Ortega Method.

Possible approaches

LSE can be solved in various ways; Gilles Roux himself, the inventer of the Roux Method, advocates a flexible/semi-intuitive approach to LSE without a strict division into substeps. The optimal approach is likely a combination of the approaches below.

Layers-based approach

  • 1. centers, BD, and FD
  • 2. ELL

This layer-based approach seems out of place in any method ending with LSE.

Original Roux

  • 1. Orient centers and edges
  • 2. Permute UR and UL edges
  • 3. Permute the M slice

The following two approaches are commonly used in Corners first methods.

Corners First approach 1

  • 1. Solve UL or UR
  • 2. Insert UL/UR while orienting the M slice
  • 3. Permute the M slice

Corners First approach 2

  • 1. Solve both UL and UR
  • 2. Orient and permute the M slice

Reduction to L5E has been proposed as an experimental approach.

L5E

  • 1. Centers and BD
  • 2. L5E

Orientation+Permutation

  • 1. Orient all edges
  • 2. Permute all edges with L6EP

L6EP

L6EP
L6EP.png
Information
Proposer(s):
Proposed:
Alt Names: LSEP, Last Six Edge Permutation
Variants: EPLL, L5EP, LSE, WaterZZ L6EP
Subgroup:
No. Algs:
Avg Moves:
Purpose(s):
Previous state: unknown
Next state: Solved cube state

Previous cube state -> L6EP step -> Solved cube state


The L6EP step is the step between the Previous cube state and the Solved cube state.

L6EP or LSEP is a subset of LSE that permutes the last six edges, usually UF, UR, UB, UL, DF and DB, finishing the solve. Like LSE, it can be solved 2-gen with only M and U moves. It is used in Corners First methods and Roux. For the latter, however, EOLR + 4c is more widespread than EO + L6EP.

A variation of it called "WaterZZ L6EP", where instead of the DB edge, the FR edge is permuted, is used in the WaterZZ method.

Possible approaches

Layers-based approach

  1. Solve the two D layer edges
  2. Finish the solve with EPLL

While this is easiest for solvers coming from CFOP, it is not very efficient.

Roux L6EP

  1. Permute UR and UL edges (Roux 4b)
  2. Permute the M slice (Roux 4c)

This approach is the most common as it is fully intuitive, very known due to the popularity of Roux and also pretty efficient.

One look L6EP

  1. Permute all six edges using one algorithm

While this is definitely the best approach in terms of ergonomics and movecount, it is rarely used due to the high amount of cases. However, since most cases are semi-intuitive, learning can be done in a similar fashion to EOLR or intuitive F2L.

External links

External links