6522Working on learning a 3-look LL
- Sep 5, 2003What a very detailed reply Ryan!
Here's where I'm up to at the moment... I've learnt several LL edge
algs -- ones that mess with the corners (which doesn't matter if LL
edges are oriented first). I already knew several LL edge algs that
preserve the corners -- I guess these are useful if the corners are
already done when you get to the LL.
I already know the Sune and its mirror (can't imagine there'd be any
cuber who doesn't know this alg?!). I've learnt the algs for the
three LL corner orientation positions where 2 are corrent and 2
require twisting. Still need to learn the 2 algs for when all 4
I'm aiming to learn the 13 PLL if my enthusiasm lasts that long. In
case it doesn't, I planned the order that I would learn the algs.
First I revised the algs that just move the edges since. I knew U and
H, but for some reason was a bit iffy with Z. After that, I just
ranked them by 'probability of occurrence'. So, of the remaining 10,
I've memorised the algs with a frequency of 1/9 or greater (A, R, J,
G). So, 7 down, 6 more to go.
I think I need to take a break from new algs and spend some time
getting the newly memorised algs firmly planted in my head. I'm
finding that I can remember them without a problem, but I'm still
taking a bit of time recognising the patterns. I'm not concerned
though because I know that practise will fix this!
--- In email@example.com, Ryan Heise
> On Mon, Sep 01, 2003 at 11:48:01AM -0000, jasmine_ellen wrote:a
> > I remembered that DanK had something like this on his site about
> > beginner method, an intermediate method and an advanced method.This
> > is actually what I was after. Who else has something like this onused.
> > their site?
> I'll describe the beginner and intermediate methods that I once
> They are simplications of the Fridrich last layer system. You needto
> first understand how that system works:because
> This general strategy, orienting first, then permuting, is good
> it is very easy to recognise the positions quickly. But instead ofand
> orienting all the pieces at once, you just orient the edges first,
> the corners second.patterns,
> BEGINNER METHOD
> First, orient the 4 edges (ie. make a cross). There are only 4
> and one algorithm to solve them all! To view this, you need to use atake you
> fixed width font:
> --- --- -x- -x-
> -x- xxx xx- xxx
> --- --- --- -x-
> For each pattern, apply the algorithm "R'U'F'U F R" and it will
> to the next pattern. Eventually you will end up with a cross.applying the
> Improvement: notice that if you apply the algorithm when you already
> have the cross, you will end up with a line. That means that you can
> jump immediately from the 2nd pattern to the 4th pattern by
> algorithm backwards! So, this step should take an average of 6moves.
> Next, orient the corners. There are only 6 patterns apart from
> Look through this complete list, and find all the patterns (andSune TM
> algorithms) that have a cross already formed:
> For the case when 3 corners need to be twisted, I recommend the
> algorithm from Petrus. See the applet at the top/right of his page:bottom
> I think it's useful to learn to twist them forwards and backwards:
> - R U R'U R U2 R'
> - R'U'R U'R'U2 R
> To see that done fast, have a look at the quicktime movies at the
> of this page:cases
> I recommend this algorithm because one of the other orientation
> can be solved by just applying this algorithm twice. To know whichcase
> I'm talking about, apply this to a solved cube: RU2R'U'RUR'U'RU'R'.do:
> Now, apply the sune (RUR'URU2R') twice:
> RUR'URU2R' + RUR'URU2R'
> Notice that the moves in the middle cancel out? So you can actually
> which is an "optimal" solution.
> Next, permute the corners (yes, before the edges). Most of the time
> there will be a 3 cycle of corners. In this case, look at the 4
> the last layer. On one of the sides, the two last layer cornerswill be
> matching in colour. Hold those two corners on the back side and do:that
> R'FR' B2 RF'R' B2 R2
> Now the corners should be solved. If you don't find any two corners
> match, apply the above algorithm and that should result in aposition
> where two corners match. Don't worry, this case rarely happens. Ifyou
> want, you can learn a special algorithm for that case by picking thean
> most attractive one from:
> The "Y" pattern on that page has the desired corner effect.
> Next, permute the edges. Again, most of the time, there will be a 3
> cycle of edges. You need to learn to cycle the edges forwards and
> - R2U FB'R2F'BU R2
> - R2U'FB'R2F'BU'R2
> Sometimes, all 4 edges need to be swapped in opposite pairs. That's
> easy case, so why not learn it:learning.
> RLU2R'L' [U] R'L'U2RL
> The [U] means rotate the whole cube from the up side, 90 degrees.
> There's also a rare case where all 4 edges need to be swapped in
> adjacent pairs. The algorithm's difficult so it's not worth
> INTERMEDIATE METHOD
> First, orient everything like the beginner method. Then permute
> everything like the full blown Fridrich method.
> How can you learn all the permutations? See my previous email:
> There, I list which algorithms to learn first, and which algorithms
> learn last.last
> ADVANCED METHOD
> You already know enough! It is not necessary to learn 40 orientation
> algorithms. 6 is enough. Gilles Roux proved that it is possible to
> achieve sub-20 times with just these 6 orientation algorithms and 13
> permutation algorithms. He used the petrus method for the first two
> layers which gives you a cross automatically when you get to the
> layer. Using that strategy, those extra orientation algorithms arenot
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