ZBRoux

2019-02-19T09:51:00Z

MRHK 57:

{{Method Infobox
|name=LLOB
|image=[[[[File:File:LLOB.jpg]]|200px|thumb|center|LLOB Method]]
|proposers=[[CriticalCubing]], [[John Li (teoidus)]]
|year=2017
|anames=ZB-Roux
|variants
|steps=4
|algs=539 (493 ZBLL, 46 EOFB or EODFDB)
|moves=41-45
|purpose= [[Speedsolving]]
}}

The '''LLOB Method''', short for '''Last Layer Optimized Blockbuilding''', is a 3x3 speedsolving method proposed by [[CriticalCubing]] and [[Teoidus]] in 2017. LLOB uses [[Roux]]'s [[F2B]] as its base and provides an alternative way to finish [[L10P]] that allows for higher max [[TPS]] and lower movecount in exchange for a large [[alg]] count. LLOB provides very good prediction during second block(SB) for [[ZBLL]]. It is fairly easy to track DF and DB edges + D center, so there should be no pause between SB and EODFDB. During EODFDB, it is very easy to recognize [[CP]] (because corners are just being [[AUF]]ed back and forth), making it possible to predict the position of two edges; hence, there should be no pause between [[EO]]+DF+DB and ZBLL. Currently, the main bottleneck of a [[Roux]] solve is the often frustratingly long pause to recognize [[CMLL]] (the rest the solve is pretty much pauseless). By performing this recognition during the execution of EO+DF+DB, we can eliminate this pause, leading to even more fluid solves.

==The Steps==

1. First Block(FB): Build a 1x2x3 block anywhere on the cube.

2. Second Block(SB): Build a second 1x2x3 block opposite of the first 1x2x3 block, without disrupting the first 1x2x3 block. After this step, there should be two 1x2x3 blocks: one on the lower left side, and one lower right side, leaving the U layer and M slice free to move.

3. EODFDB: Simultaneously solve EO (Edge Orientation) and insert the DF and DB edges to its correct place. 46 or more algs

4. ZBLL: Since you have EO done and DFDB inserted, you solve the rest using ZBLL. 493 algs

==Pros==

*Low move count. F2B+EODFDB average movecount is as efficient as ZZ-a ZZF2L (if not more).
*First 2 Blocks + EODFDB is intuitive and requires fewer algorithms.
*After the first block is built the rest of the cube can be solved mostly with R, r, M and U moves thus eliminating rotations. You will only rotate, if your ZBLL alg has rotations in it.
*Higher TPS than CMLL/LSE as CMLL is 10 drilled algorithmic face turns while LSE is 13 moves MU spam. EODFDB is 8 moves MU spam and 15 drilled algorithmic face turns.
*Good prediction for ZBLL during EODFDB allowing for more fluid pauseless solves and seamless transition.
*The blockbuilding and intuitive nature of the method allows for rapid improvements in lookahead and inspection

==Cons==
*Large algorithm count due to using ZBLL.
*Block building can be difficult for a beginner to get used to. The reliance on r and M moves and its intuitive nature nature will be tough for beginners to get used to.
* Block building style and slice moves can be a problem on big cubes.
==Forum links==
* [https://www.speedsolving.com/forum/threads/last-layer-optimized-blockbuilding-llob-method.65223/ LLOB discussion thread]

== External links ==
* [https://docs.google.com/document/d/1gs3THtRU5UCckKcM_5zjjm5RkJmGxHAJUnv6ta4lJhw/edit LLOB Word Document highlighting more information]

[[Category:3x3x3 methods]]
[[Category:3x3x3 speedsolving methods]]

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