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Improved 2-Sided PLL Recognition System

Lucas Garron

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I've seen a few 2-sided PLL recognition systems, but a lot of them require you to recognize different PLLs in different ways.

The best I ever ran into was Andy Klise's system, but his PDF has a lot of "Non-Unique Cases". However, I discovered that there are only two kinds of non-unique cases, and you can use One Weird Trick for each one.

I've taken Andy's work and reorganized it to emphasize the similar structure of a lot of the cases. For example, I took his numbered cases and gave them syllables based on the patterns that a speedcuber might already know intuitively. All the "annoying" non-unique cases have been combined into one simple rule (which I called the "danger zone" in the video).

I don't know how much time I'll have to spend on this, but I've made a video describing what I have so far. (Be warned that I don't explain every single detail.)
If you like the idea, feel free to update Andy's diagrams, make a pretty flowchart, or try to improve it further.

 
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Lucas Garron

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For those following along at home:



Code:
  AUF:             __    U'    U2    U         Alg Hint

         S      SO    SO    SO    SO    SO     :-)

         T      LA no MI no RA    MO    LA     R U
  - no   Ga     RA    MI no RI    MA no RA     R2 u
         Gc     LI no MI    LA no MA    LI     R2 u'

  /- no  Aa     LO    LI no MA da RA    LO     cw: l' U
  \+ da  Ab     MA no RI    RO    LA da MA     ccw: l U'

         Ra     LA da MI    LI da MA    LA     R U R' F'
  + da   Rb     MA da RI    MI da RA    MA     R' U2
         F      LI da MI da RI    SO    LI     R' U' F'

         Gd     RI    LO    RI    MO    RI     R U R'
         Gb     LI    RO    LI    MO    LI     R' U' R

         L      LA    LO    LA    SO    LA     R' U2
         J      RA    RO    RA    SO    RA     R U R'

         V      LO    MI 2  MI    RO    LO     2-col: R' U R'
  MIMI   E      MI cc MI cw MI cc MI cw MI     3-ccw: l U' / 3-cw: U l U'
         Y      LO    RO    MI 4  MI    LO     4-col: F R

         Ub     MA cc MA    SO    MO    MA     3-cw: R2 U
  MAMA   Ua     MA    MO    SO    MA cw MA     3-ccw: R U'
         Z      MA 2  MA 4  MA 2  MA 4  MA     2-col: U R' / 4-col: R'

         H      MO    MO    MO    MO    MO     M2
         Na     RO    RO    RO    RO    RO     R U'
         Nb     LO    LO    LO    LO    LO     R' U
Compact version:

Code:
AUF:  _  U' U2 U    Alg Hint
S   So So So So So  :-)
T   La-Mi-Ra Mo La  R U
Ga  Ra Mi-Ri Ma-Ra  R2 u
Gc  Li-Mi La-Ma Li  R2 u'
Aa  Lo Li-Ma+Ra Lo  cw: l' U
Ab  Ma-Ri Ro La+Ma  ccw: l U'
Ra  La+Mi Li+Ma La  R U R' F'
Rb  Ma+Ri Mi+Ra Ma  R' U2
F   Li+Mi+Ri So Li  R' U' F'
Gd  Ri Lo Ri Mo Ri  R U R'
Gb  Li Ro Li Mo Li  R' U' R
L   La Lo La So La  R' U2
J   Ra Ro Ra So Ra  R U R'
V   Lo Mi Mi Ro Lo  2: R' U R'
E   Mi Mi Mi Mi Mi  3:(U) l U'
Y   Lo Ro Mi Mi Lo  4: F R
Ub  Ma Ma So Mo Ma  3cw: R2 U
Ua  Ma Mo So Ma Ma  3ccw: R U'
Z   Ma Ma Ma Ma Ma  2:U / 4:R'
H   Mo Mo Mo Mo Mo  M2
Na  Ro Ro Ro Ro Ro  R U'
Nb  Lo Lo Lo Lo Lo  R' U
 
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jeff081692

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Is 'learning' 2 side pll recognition even necessary? I can do 2 side recognition but I never actually tried to learn it, it's just easy now after doing enough solves.
For me it is. I've been cubing for years and there is a very small percentage of cases that I can recognize from 2 sides. I'm sure if I kept doing solves eventually it would come to me but I might as well spend an hour analyzing the differences now so I can practice it in solves immediately instead of waiting for me to naturally acquire that skill. For example yesterday I learned to recognize U perms from 2 sides when the 3x1 block is not visible and I don't know how long it would take me to recognize them from two sides if I kept doing solves the way I do.
 

Lucas Garron

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Is 'learning' 2 side pll recognition even necessary? I can do 2 side recognition but I never actually tried to learn it, it's just easy now after doing enough solves.
PLL Recognition Party!


It's certainly not impossible, but I'd be impressed if someone can figure the PLL (including AUF) for all of these without studying them a bit.

I knew some tricks for specific cases, but like jeff081692 I wanted to fill in all the gaps.

(Some of the tricks:
)
 
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TDM

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Without studying them:

1. U' R' F R' B2 R F' R' B2 R2
2. U' L U2 L' U2 L F' L' U' L U L F L2 [AUF?] (E: after looking closely, no AUF)
3. U' y2 R2' F' R U R U' R' F' R U2' R' U2 R' F2 R2
4. U R' F R' B2 R F' R' B2 R2
5. y2 R' U L' U2 R U' R' U2 R L
6. y' R' U R' U' R D' R' D R' [U D'] R2 U' R2' D R2
7. (E2: is it a U2 from the same G perm as 8? Again, had to look harder for this one)
8. y' L2 F2 L' U2 L' U2 L F' L' U' L U L F' L2 U2

I don't practise 2-sided PLL nor have I ever learned it, but like ben I find as I do more and more solves PLL recog becomes easier. If you learn 2-sided recog, you have to look and think more carefully to decide which case it is. I sometimes find myself half way through an alg before I realise what case it is.
 
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Rubiks560

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Seems overly complex. I've known two sided PLL recog just from solving. Never tried to learn it. There's a few cases (I think only G perms) that I have to sometimes check more than 2 sides.
 

Lucas Garron

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Without studying them:

1. U' R' F R' B2 R F' R' B2 R2
2. U' L U2 L' U2 L F' L' U' L U L F L2 [AUF?] (E: after looking closely, no AUF)
3. U' y2 R2' F' R U R U' R' F' R U2' R' U2 R' F2 R2
4. U R' F R' B2 R F' R' B2 R2
5. y2 R' U L' U2 R U' R' U2 R L
6. y' R' U R' U' R D' R' D R' [U D'] R2 U' R2' D R2
7. (E2: is it a U2 from the same G perm as 8? Again, had to look harder for this one)
8. y' L2 F2 L' U2 L' U2 L F' L' U' L U L F' L2 U2

I don't practise 2-sided PLL nor have I ever learned it, but like ben I find as I do more and more solves PLL recog becomes easier. If you learn 2-sided recog, you have to look and think more carefully to decide which case it is. I sometimes find myself half way through an alg before I realise what case it is.
I just tried the first and last of those, and they're both wrong. ;-)
 

jeff081692

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If you learn 2-sided recog, you have to look and think more carefully to decide which case it is. I sometimes find myself half way through an alg before I realise what case it is.
Like anything in the beginning it is slower to recognize than looking at more than 2 sides but it's the end goal that matters and getting to the point where you don't have to think is when you have mastered it.
 

Escher

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Those all seem easy to me, excuse me if I get the names wrong, doing them from memory, but the class should be correct.

Ga, Ra, Gb, A, Ja, V, F, Ga
(Edit - am dumb that V is a Y)

I've never specifically learned 2-sided PLL but I can see it as a good way of quickly doing what you end up knowing intuitively after a while.
 
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Nilsibert

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I don't practise 2-sided PLL nor have I ever learned it, but like ben I find as I do more and more solves PLL recog becomes easier. If you learn 2-sided recog, you have to look and think more carefully to decide which case it is. I sometimes find myself half way through an alg before I realise what case it is.
I basically read trough Sarah strongs guide and picked up some hints. After that, I used PLL or LL scrambles and just tried to recognise any PLL from 2 sides. I've been doing this for a few days and started practising it in every untimed solve. It helped a lot.

I think it's best to just get an idea of certain groups of cases(outer or inner bars, headlights and so on) and with time it will become easier and easier.
At first you will have to think and look a lot as you said, but that will go away with time I'd say. Many cases that had me pause a lot have started to just appear as a distinct pattern that I instantly recognize.
 
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TDM

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I basically read trough Sarah strongs guide and picked up some hints. After that, I used PLL or LL scrambles and just tried to recognise any PLL from 2 sides. I've been doing this for a few days and started practising it in every untimed solve. It helped a lot.

I think it's best to just get an idea of certain groups of cases(outer or inner bars, headlights and so on) and with time it will become easier and easier.
At first you will have to think and look a lot as you said, but that will go away with time I'd say. Many cases that had me pause a lot have started to just appear as a distinct pattern that I instantly recognize.
Personally, except for recognising V/Y perms and which AUF to do E perms, I've had no problem with my way. I guess either can work, just like intuitive and algorithmic F2L. However, I think that if you don't know full 2-sided recog, as if you were halfway through what you're learning, you have the disadvantage of having to check to see if it's a case you know first, and then if you don't know it having to then do 'normal' recognition, slowing you down. But yes, once you've fully learned either method I can't see why one method should have the advantage.
 

sneaklyfox

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Wow, I can do all of those 2-sided PLL recognition cases. I checked which one I thought it was and I got it. Never actually practiced it. I guess I sometimes check more sides just to be sure and anyway I usually have to start the alg from a different angle anyway so I would have to do U/U'.
 
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