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MarkA64

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How do you know which F2L pairs to solve first for maximum efficiency?

I usually focus on the front right slot first always and rotate if needed, but some people have recommended working with the pieces that end up in the top layer after cross.
 
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Llewelys

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@Mischiiii
It's explained here, between 1:00 and 4:00

@MarkA64
Are you talking about which pair to plan during inspection / to track during cross ?
If so:
- If you want to focus on one specific pair regardless on where it'll end up after cross, I would suggest focusing on the pair going to the back left slot rather than the front right slot.
- If not, you can either choose the pair where the pieces won't move much during cross (works really well for 2 gen crosses), or indeed choose one where the pieces end up on the top layer.
 

Fredrick

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So I was going through some example solves and noticed that every so often instead of rotating a person would do a wide d move. Which should I do more often? Rotations or Wide D moves.
 

Mischiiii

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Nov 12, 2019
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@Mischiiii
It's explained here, between 1:00 and 4:00

@MarkA64
Are you talking about which pair to plan during inspection / to track during cross ?
If so:
- If you want to focus on one specific pair regardless on where it'll end up after cross, I would suggest focusing on the pair going to the back left slot rather than the front right slot.
- If not, you can either choose the pair where the pieces won't move much during cross (works really well for 2 gen crosses), or indeed choose one where the pieces end up on the top layer.
I guess i wasn’t specific enough. I can solve all of the cases easily but i just sometimes Come across pairs that can be solved both ways. Also i try to be move efficient. This video (which i already saw when learning f2l) is very basic. But sometimes the difference between a R U R‘ insert (best insert) and a case 2 insert is having to do a F or B move. And those always suck.
 

MarkA64

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@Mischiiii
It's explained here, between 1:00 and 4:00

@MarkA64
Are you talking about which pair to plan during inspection / to track during cross ?
If so:
- If you want to focus on one specific pair regardless on where it'll end up after cross, I would suggest focusing on the pair going to the back left slot rather than the front right slot.
- If not, you can either choose the pair where the pieces won't move much during cross (works really well for 2 gen crosses), or indeed choose one where the pieces end up on the top layer.
Just curious as to why you supported focusing on the back left slot. Thanks, btw!

Edit: I suppose it's quite wise to take a peek at that back slot.
 
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Llewelys

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So I was going through some example solves and noticed that every so often instead of rotating a person would do a wide d move. Which should I do more often? Rotations or Wide D moves.
Rotations and d moves both require to regrip both hands but there's a bigger risk of locking up during a d move, so I would favour rotations.
But the difference is minor so I guess it all comes down to personal preference.
I've never used d moves, maybe someone with more experience than me can give their hindsight?

I guess i wasn’t specific enough. I can solve all of the cases easily but i just sometimes Come across pairs that can be solved both ways. Also i try to be move efficient. This video (which i already saw when learning f2l) is very basic. But sometimes the difference between a R U R‘ insert (best insert) and a case 2 insert is having to do a F or B move. And those always suck.
Could you provide an example? I'm not sure I understand what you mean.
You also asked about how to know if you need to rotate or not: well you said it yourself, if the side color of the edge matches either the left or right colors then you don't need to rotate.

Just curious as to why you supported focusing on the back left slot.
It's generally a good idea to fill back slots sooner rather than later for look ahead reasons: you can't see as well what going on there. That's especially true for the BL slot, since when you solve your cube is slightly tilted and that's the slot you see the least. (Unless you're a left hand dominant solver, then the BR slot is the one you should fill first)
 
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Atomix

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I really hope J perm adds a cross and F2l trainer to his website. It will help many cubers such as myself to improve
Highly doubt that since he himself said that even teaching cross is diffcult. What you can do is while practicing solves , you can comment on the scrambles that have a hard cross. You can then rescramble the cube and see the no. of ways you can come up to solve efficient cross.
For F2L , learn efficient ways to solve cases, not as algorithms, but as methods.
 
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MarkA64

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Can you provide examples?
Yes: if you would solve a pair in the top layer (especially when they are ready to be inserted) and you know for sure you're going to rotate afterwards, d moves provide both sight and speed.

I would say it definitely takes recognition to use d moves in f2l, but there are certain things d moves do for you that cube rotations don't - since they technically turn a layer while rotating.
 
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MarkA64

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How would you solve this orange blue pair in the back left slot from this angle (Front face) without rotating?



Edit: found a solutuon
U2 l U' L' U L U l'
 
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MarkA64

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Hey guys, felt like sharing an algorithm I learned today. It's not really listed anywhere, it's just a combination of moves, but the latter part is something everyone should know.


You basically bring the edge from the back left out (without unsolving anything) and then do r U' R' U R U r'.

Rotationless and fast.

Here's another algorithim to solve this case from the back without rotating.


L F R U' R' F' L'
 

Tom Joad

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Jun 29, 2016
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Hey guys, felt like sharing an algorithm I learned today. It's not really listed anywhere, it's just a combination of moves, but the latter part is something everyone should know.


You basically bring the edge from the back left out (without unsolving anything) and then do r U' R' U R U r'.

Rotationless and fast.
Cool!
I’m trying to learn f2l from all angles for super efficiency and execution. So many more cases than you might imagine!

For the case above I want my alg to be B’RUR’B

But I still need to practice recognition and execution.

I tend to do a U first then recognise then do a U’, need to stare at the case for an hour or two haha
 
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