How to recognize G perms?

Vulosity

Vulosity

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I really have trouble recognizing the 4 different types of the G-Perm. I know the algs but, I always take about 3-5 seconds trying to decide which G-perm it is.

Any help?
 
There are two basic "schools" of recognizing the Gs. The video referenced above is used by many people, including the famous Mackie, and a good friend of mine. That being said, I think it's overly complicated and hard to grasp. If you get it, use it. But if you're like me and you don't get that one, use Bob Burton's method. It's as easy as it gets.

In a nutshell:

1. Solve the 1x1x2 block that all Gs have. I.E. match the 1x1x2 block with the second layer.
2. All G perms share a common trait: Look at the edges of the upper layer. On one of the four edges you will find two corners with the same color. Rotate the cube to put that edge on the left side.
3. Now look at the 1x1x2 block. It will be in one of four positions. I call those positions down, back, front, and up. Call them whatever you like, just learn to recognize them.
4. Based upon the position recognized in the previous step, simply execute the proper algorithm. I literally think of the G perms as "up, down, back, and front" in my mind and have an algorithm tied to those words and images.

If my rapidly typed explanation doesn't blow up your skirt, read it from the man himself, Bob Burton, here: (scroll down to cases 14 - 17)

http://www.cubewhiz.com/pll.html

Don't be discouraged if it doesn't come to you quickly. I learned the 4 algs in a day, but they were far from ingrained, and recognizing them was slow. It took a long time before I really "got" the Gs, and I still occasionally make mistakes.

Hope that helps.

Brian.
 
KYLE ALLAIRE DROPS BOMBS! said:
to be honest, that video explanation is horrible. it made me laugh.
Click to expand...

agreed, except it made me angry. its just him rambling for 3 and a half minutes. also, he says "i" instead of prime. it hurts my ears when people do that. especially when he said "y-i".

i will make one that is not stupid tommorow night if i am not too tired when i get home from work.
 
I just put the face with 2 similar colored corner stickers on the left and look for the 2x1x1 block. Where that block is relative to the face-with-2-similar-colored-corner-stickers is tells me what G perm to use.

I never really had any trouble recognizing any perm, mostly because I've always been recognizing them by their 2x1x1 blocks rather than arrows.
 
I do not use PLL exept in those cases I got a corner orientation skip after VHF2L, else I go COLL. So my recognition for G's are horrible, takes forever because I'm out of practice. In that time I can do a J-PLL instead to solve the corners and then I fill in a U-PLL for the edges, it's faster for me :p
 
AUF so that the 1x1x2 block is in place, then put the two same colored corner stickers to your left. Then determine the algorithm according to where the 1x1x2 block is.
 
Hmmm, nobody has mentioned the method i use.

I place the 2x2x1 block so that it's on it's face. Does that make sense? i.e. if it's orange, i put it on the orange face.

Now, it can be either on the right or the left. Once i've placed it, i just look at the colour of the other cubie next to the 2x2x1 block. It will other be the opposite colour of the 2x2x1 block or it wont. By opposite, i mean if the 2x2x1 is orange, the last cubie is red. So depending on what i see there, i know what G perm to do.

I do this for the A perms and V perm as well.
 
DAE_JA_VOO said:
Hmmm, nobody has mentioned the method i use.

I place the 2x2x1 block so that it's on it's face. Does that make sense? i.e. if it's orange, i put it on the orange face.

Now, it can be either on the right or the left. Once i've placed it, i just look at the colour of the other cubie next to the 2x2x1 block. It will other be the opposite colour of the 2x2x1 block or it wont. By opposite, i mean if the 2x2x1 is orange, the last cubie is red. So depending on what i see there, i know what G perm to do.

I do this for the A perms and V perm as well.
Click to expand...
That method has already been mentioned in another thread. I will search for it...
Here we go: http://www.speedsolving.com/forum/showpost.php?p=70172&postcount=4
And the thread: http://www.speedsolving.com/forum/showthread.php?t=5401&highlight=recognizing

By the way how do you differentiate a G permutation and an R permutation from that method? It seems like you're only looking at one face.

Vault312 said:
KYLE ALLAIRE DROPS BOMBS! said:
to be honest, that video explanation is horrible. it made me laugh.
Click to expand...

agreed, except it made me angry. its just him rambling for 3 and a half minutes. also, he says "i" instead of prime. it hurts my ears when people do that. especially when he said "y-i".

i will make one that is not stupid tommorow night if i am not too tired when i get home from work.
Click to expand...
Hmmm... It's not great but I understood everything. That's how I first learned how to recognize G permutations...
 
Last edited:
Rubik's Cube Fan said:
By the way how do you differentiate a G permutation and an R permutation from that method? It seems like you're only looking at one face.
Click to expand...

You can always see 3 faces of the cube. The U face and then two side faces. While i look at the 3x3x1 set to determine which G-Perm to use, i notice whether or not there's a consistency on the OTHER set. The R perms leave the other set with the corner pieces the same and the edge piece different. If i see that, i know to do an R perm.

I've realised that i don't do that consciously though. My brain seems to do that bit for me. It's like the only time i notice the other pieces is when there's a consistency and when an R perm is to be done.

It's hard to explain :P
 
G permutations - Recog. + Memo...?

I'm learning the LAST 4 ALGS OF PLL (yay me!!!) (but I barely understand V and N(b), but I know enough to survive... :D (and probably take like 7 secodns to execute. ;P)), which are obviously the G permutations (a through d, respectively).

Ellis (hey Ellis!) told me a way to recognize them by grouping them into "UF" and "UR" edges paired with the FRU edge (which helped, but I'm still not understanding the alg...).

Badmephisto's PLL video taught me to see the "headlights" configuration in relation to the pairs (which really is the same as the other one, but I just look at the L face for Ellis's PLLs)... and all of the cubing sites I've visited only give you the direct algorithm and not really a way to recognize it... >_<

Can anybody help me with this?

Note: I just need help with the memorization of these 4 algorithms, since yes, they're distinct, but really similar and I don't want to mix them up. ><

The way I understand it now (will be edited as I start to "understand" this more):

Group 1: FRU with UF edge

Same corners (colours) on L face:
(R2 u R' U R' U' R u' R2) (y' R' U R y)

Different corner colours on L face:
(y' R' U' R y) (R2 u R' U R U' R u' R2)


Group 2: FRU with UR edge:

Same corner colours on L face:
(R U R' y') (R2 u' R U' R' U R' u R2) y

NOT same corner colours on L face:
(y' R2 u' R U' R U R' u R2) (y R U R')
 
I know i'm gonna win the Golden Frying Pan for this but i think it might help. The way i'm learning to recognize G perms is to do a particular perm 2 times (countering any cube rotations that were in the alg inbetween) and look at the pattern, and where the 'headlights' and 1x1x2 block are on the cube. It's kinda more visual and particularly helpful if someone learns easier by seeing. :) I just got 2 G's in 5 minutes doing this, so yeah ^^ let's just say it's my practical approach ^^'
 
I actually found it pretty easy :P

Places the headlights to the left and and look for the 1x2x2 block. 3 of the 4th are visible. If you can't see it, it's the 4th.
Just be careful not to mix them up with R perms from the wrong angle at first.
 
Take a list with the algs (and a cube, obviously), sit your lazy ass down and study the patters on the LL stickers until you figured out what unique features each of the G perms have, and how they relate to each other. Then, solve about 100,000 cubes, and your recognition will improve with time.
 
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