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Nilsibert
I've picked up cubing again and decided to improve my f2l. I found some great solutions for bad cases with flipped edges or pieces in wrong slot (or both) etc that can be solved with some neat algs. My problem now is, should I even bother solving cases where for example an edge is in the wrong slot, provided its like the first or second pair? Or is it generally better to look for easier pairs which will end up taking out that edge anyway when solving? Then again what if I don't see an easy case?
It seems to me that using algs makes most sense with the last pair. How would you go about this? Or will my decision making improve anyway as my look ahead gets better?
Which brings me to my second problem: look ahead with certain algs. Take this for example; Rw' F U' R U M'
Cool case and all, but I have a hard time looking ahead when doing it. And if it's the first pair, should I even bother or is it better to look for an easier one? That edge will end up being taken out of that slot anyway.

tl;dr: how to decide when to use advanced solutions for weird cases and how to look ahead when doing so?
 
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Jul 2, 2019
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Hey guys,

I've been cubing for a while and I'm a bit stuck at a point. My times are hitting 30s now for 3x3x3, but I'm a bit confused at how I should be progressing at F2L.

I learnt a lot of the F2L cases and it really helped, but of course the F2L algs are always oriented assuming you are inserting into the front right slot. Because of this, I always identify my next pair, turn the cube to the target slot, and then execute the alg (or intuitevly solve it).

Of course, everyone says the same thing, "To improve your F2L times you have to get comfortable inserting into the back slots", and, "you shouldn't be turning the cube". So here is where I'm confused. If the F2L cases are assuming front right target slot, then how am I supposed to apply them and insert into the back slots (or even the front left slot) without turning the cube?

In addition, making B moves when pearing up is terribly slow, and I've seen some example solves where they say to turn the cube instead of making B moves.

So, what should I be doing?

Sorry, I'm pretty confused!

Thanks!
 
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There is a little bit of misconception about back slots of f2l. What you should be capable of doing is executing all your f2l algs from both front and back left and right sides(as in the alg and its mirror) . What you should do for your first pair if you can execute and pair it in the front or back without cube rotating then do so, however if you have to rotate to perform your alg then rotate to have it in the back therefore your front slots will be empty. Your goal is to simply keep as many front slots empty as possible while not ever having to do a y2 in your f2l the only allowed cube rotations for f2l are y and y' as long as you can't do your pair from your current spot(if you can do it from your position front or back then don't rotate). In doing say the 3rd pair and you find yourself in need of a rotation, turn the cube so that the forth pair's location is on the front even if that means making the 3rd pair on the front too.

I hope this helped you better understand how to do f2l pairs in the back.
 

Aerma

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There is a little bit of misconception about back slots of f2l. What you should be capable of doing is executing all your f2l algs from both front and back left and right sides(as in the alg and its mirror) . What you should do for your first pair if you can execute and pair it in the front or back without cube rotating then do so, however if you have to rotate to perform your alg then rotate to have it in the back therefore your front slots will be empty. Your goal is to simply keep as many front slots empty as possible while not ever having to do a y2 in your f2l the only allowed cube rotations for f2l are y and y' as long as you can't do your pair from your current spot(if you can do it from your position front or back then don't rotate). In doing say the 3rd pair and you find yourself in need of a rotation, turn the cube so that the forth pair's location is on the front even if that means making the 3rd pair on the front too.

I hope this helped you better understand how to do f2l pairs in the back.
This is good. Also, don't use algs for everything - only the especially difficult cases that can't really be efficient without algs.
 
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PRACTICE. while practice really is the most important thing, it is also very useful to find efficient ways to pair things up, and implement them into your solves. Lazermonkey has a pretty good video on all of the f2l cases. One thing that can really help, is doing slow solves and trying to pair things up in a different way.At first I would avoid learning algs, but once you get to about sub 20, I would start finding f2l algs to prevent rotations. Hopefully that helps, and tell me if you need help with anything else.
 
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How should I approach each f2l pair?
Im trying to figure out how to speed up my time, which is currently in around 1 minute :(.
I spend a lot of time on f2l and I want to find how the next step for getting a better time.

1. How should I choose which pair to insert each step? Should I be looking for a random corner piece and then trying to find its match? Looking for an edge piece and trying to match it's corner? Looking for anything white? Looking for the pair matching my current position? Etc.

2. When I find a pair, what is the first thing I should be doing/thinking of?

Obviously I can't do anything too advanced yet, looking for anything that would make me pause less
 
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1. How should I choose which pair to insert each step?
anything that would make me pause less
Since you are a 1 minute solver, let's be honest....... Don't choose!!!!. Do the first exact pair that you see! When you pause for choosing, time is lost via that.

(Following content may seems ridiculous to sub-30 people but I think is useful to you.)

Which pair you may ask? Well, after you finished the cross, look for any corner/edge piece that come into your eyes first and than find another piece that pairs up with it by holding your finger on the first piece to keep track of it than rotate the entire cube to find another. Than, do the solution you like. Even a bad, intuitive solution can get you in the 40s.

2. When I find a pair, what is the first thing I should be doing/thinking of?
The first thing you should think of now is which case that actually is. Do something like U or U' moves to find out if you can't see it right away.

Feel free to ask any questions if I am not clear.
 
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Here's a tip if any corner has White facing up (since it will stand out pretty well)

Find it's corresponding edge:
if it's already in the E-layer, do some U turns to put it on top of the edge
if the edge is oriented correctly, it's a pair! pull out the pair and insert it wherever
if they don't pair up, do 2.5 sexy moves in a row to pair them on U. Then insert it.

If the edge is on U and not next to the corner do a quarter turn on it so U turns can place the corner on top of it correctly.
then reverse the quarter turn... voila, a pair on U!

whew, that's wordy :( Cube videos are better at providing instruction than I can describe.
See if anything in this F2L tutorial helps you:


-= Solvador Cubi
 
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I'm learning F2L at the moment and my times are very inconsistent, ranging from 50 seconds to 30 seconds. A few questions:
Should I keep practicing with only F2L or practice LBL as well?
I've only done 5 solves but those times were very inconsistent based on how easy the pairs were. Is this a problem?
I average 45 sec so F2L isn't really changing my times except to make them very inconsistent. This is most likely because I haven't been doing F2l for long but still this seems a problem as well.
Also any videos on intuitive F2L will be appreciated, albeit the jperm one.
 
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Whenever you learn new cubing techniques theymake you slower at first becuase you haven't practiced them enough, however if you practice F2L more and get used to it, your times will improve.
 
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I have not been practicing Fridrich F2L more than a few weeks.

I wrote these personal notes for helping myself out getting better.
if you have any thoughts feel free to post them.

my biggest problem is to spot the two pieces (looking ahead). putting them together is really intuitiv when you get the hang of it. the challenge here is to know the fastest way to do it. pairing up can be done in many ways. some ways can just be done in less moves than others.

I found that once you can cathegorize the sitations in your head it becomes easy to "find" the solution to it.

I cathegorize as follows:

1. pieces already next to each other
2. seperate pieces

pairs can either already be solved correctly or you have to take them apart and bring them back together correctly.

seperate pieces "just" have to be put together corectly.

when you work the pieces around the top layer remember to use an unsolved slot.

most of the time you have to bring one of the two pieces into the f2l keeping one piece in the top layer. from there you can position it so when the other piece is taken back they are in either a pair or a potenstional set.

moves from here is found in the very basic solution.


also, please correct me if you find errors :)

-Sigurd
look up f2l algorithms to find the most efficient way to solve each case
 
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I use CFOP with 2LLL. I used to be sub-90 when I used LBL, Now I'm sub-60. And, I spend too much time on F2L, like, 30 seconds. How do I improve? And I'm also reluctant to learn 1LLL because I really can't remember that many algs.
 
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F2L is doing me in too. I just can't recognize the pairs although I am getting a bit better.

I would recommend this video on intuitive F2L pairing. It's well worth the time spent watching it.

 
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