Fridrich expansions

[JustinJ]

?
Do R U' R'.
There are separate algorithms for cases where the pair is like that and when there's an F2L pair made. So the set up is making a pair so that you can insert in 3 moves normally. And the cases are pretty intuitive if you know a bit about edge orientation in F2L.

My bad, I thought VHF2L was when you had a pair already made and everything else was ZBF2L.

"Also, people have been saying 1LLL, but is it really a 1LLL if you have to recognize that you got a skip? If you can see the edges being solved at COLL then it would be, but otherwise?"

Sorry, I don't understand what you're saying here.

I always thought the amount of looks referred to the amount of times you had to recognize a case, not the amount of algs used. I think I got that from this page on Lucas Garron's site, http://cube.garron.us/algs/compOLL/,

It turns OLL into a 1-look, 2-alg process.

but after looking around I've found different definitions, so I'm not sure which is the right one.

 

[Lord Voldemort]

No, VHF2L is quite a bit simpler
Only edge orientation with only two states possible for the last F2L pair.

I see what you're saying there.
I suppose you have to recognize two cases, VHF2L and COLL.
But it's a lot simplified with partial edge control for the first 3 pairxs.

 

[JustinJ]

No, VHF2L is quite a bit simpler
Only edge orientation with only two states possible for the last F2L pair.

I see what you're saying there.
I suppose you have to recognize two cases, VHF2L and COLL.
But it's a lot simplified with partial edge control for the first 3 pairxs.

What I was trying to get at was that you'd still have to recognize that you got a PLL skip, which is another look but I fail at explaining things.

Is partial edge control for the first three pairs just something like choosing between U R U' R' and R' F R F'? VHF2L is starting to sound interesting to try I might learn a couple cases and see what my times are like.

 

[Lord Voldemort]

Yeah.
I'll try to get a good example on an edit.
I'm no expert, so this will be less than perfect.

VHF2L itself is a set of algorithms, but it uses the same principles as edge control.

Scramble: F D U2 L2 B2 L2 R2 U2 L2 B L B' R D F' L' B R' F R2 F' D F' B U

Cross color on D.

Cross: R' B' R U' L F2
Pair 1: L U2 L2 U' L
This isn't what I would do in speed yet, but in slow solves:
L U2 L' U, then do a y or y' and enjoy edge orientation.
Pair 2: y (right is new front) R U' R' U' L' U' L
This isn't a good example though...

 

[Lord Voldemort]

Another example:
Cross color on U

Scramble: R D' L R D R2 D2 U R2 L2 D2 F2 B' R' F U D' R' U D' L F B R2 U

Cross: x2 F L D2 L U2 L' U L2
LB and UR aren't oriented. Note that that there is a 3 move pair and a formed F2L pair, so we clear those first.
Pair 1: U' R' U' R
Wow, multislot
Pair 2: U2 L U' L'
Pair 3: U' L' U L
Ok, here's where it come in.
The easiest solution here is
d R' U R U' R' U' R, but that leaves two bad edges

So we do:
R U2 R', putting the bad edge in the slot so it can be flipped with a cube rotation and also separating the corner and the edge. Now you can form the pair after doing a y or y' (also a d or d' sometimes) and have edge orientation. Not that this isn't quite VH because the pair wasn't formed when we oriented the edges.

Overall, I don't suggest learning VH until you understand edge control, because you'll know how the algorithms work and you'll be able to apply the tricks without doing a full algorithm.

 

[JustinJ]

Another example:
Cross color on U

Scramble: R D' L R D R2 D2 U R2 L2 D2 F2 B' R' F U D' R' U D' L F B R2 U

Cross: x2 F L D2 L U2 L' U L2
LB and UR aren't oriented. Note that that there is a 3 move pair and a formed F2L pair, so we clear those first.
Pair 1: U' R' U' R
Wow, multislot
Pair 2: U2 L U' L'
Pair 3: U' L' U L
Ok, here's where it come in.
The easiest solution here is
d R' U R U' R' U' R, but that leaves two bad edges

So we do:
R U2 R', putting the bad edge in the slot so it can be flipped with a cube rotation and also separating the corner and the edge. Now you can form the pair after doing a y or y' (also a d or d' sometimes) and have edge orientation. Not that this isn't quite VH because the pair wasn't formed when we oriented the edges.

Overall, I don't suggest learning VH until you understand edge control, because you'll know how the algorithms work and you'll be able to apply the tricks without doing a full algorithm.

Hmm, that was very interesting, although I don't think it would speed me up very much at all to have the edges oriented unless I knew the COLL case. Thanks for typing that up, I appreciate it. Crazy easy F2L

 

[Lord Voldemort]

If it's only a 3-4 move thing (like it was in the above examples) and you can do it on the fly, then orienting edges will still help because of 2 gen OLL. I'll look for other examples too.

Ahh, here's a good one.
Scramble: D R U2 F D R U R2 U R2 F2 U' L' F' B2 U' B' F2 D2 F' D' U' B2 U L
Cross on D

Cross: U2 R' F B' D B D
Pair 1: R U2 R' B' R B R'
The B moves are avoided with a slight cube rotation on x. Notice how we flipped the edge that was in RB and inserting the F2L pair without a y rotation, which is slower than an x rotation (for me at least).
Pair 2: D' U' F U' F' D
Notice how there are two bad edges left before this pair. This rearranges the bad edges do that you can fix them easier, and also sets up a multislot.
Finish F2L: U F U F' U' L U2 L2 U L

Usually, I don't come up with this epic multislots (it was an accident this time ), but you can see how you rearrange the edges and wait for the right time to fix them. It's best if you can do a R' F R F' insertion instead of a R U' R', but sometime you have to take a few extra move.

EDIT: I think you were asking about VH and then I started explaining edge control, my bad. But hopefully this got you some understanding as to how it works.