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[Help Thread] Big Cube Discussion (5x5 / 6x6 / 7x7 / etc)

Pooker08

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Oct 2, 2020
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hey I'm not a beginner i average around 20 secs on 3x3 and just got a 7x7 does anyone know how many parity's there are on a 7x7? And if so what are there algorithims.
 

xyzzy

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Dec 24, 2015
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when should I learn l2c and l2e algs I avg 1:50 on 5x5
Any time you want to.

Treat L2C like F2L (or F2B, since you're a Rouxer): look at the algs to make sure you know what the efficient solutions are, but learn them by looking at how the pieces split apart and join together.

Priority for L2E algs should be (from highest to lowest):
1. all basic slice-flip-slice cases (including the double midge flip)
2. r U2 r U2 F2 r F2 l' U2 l U2 r2 (execute as r U2 r U2 x U2 r U2 3r' U2 3r B2 r2)
3. r2 F2 U2 r2 U2 F2 r2 (looks like PLL parity)
4. (F U' R U') (r2 F2 U2 r2 U2 F2 r2) (this case is missing from many alg sheets, including Speed Cube DB at the time of writing (!))
5. r U2 r2 U2 r' U2 r U2 r' U2 r2 U2 r and the inverse (diag checkerboards; this is the only L2E case where the best alg happens to be rU 2-gen)
6. all of the rest
 

Kaneki Uchiha

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Mar 22, 2020
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Any time you want to.

Treat L2C like F2L (or F2B, since you're a Rouxer): look at the algs to make sure you know what the efficient solutions are, but learn them by looking at how the pieces split apart and join together.

Priority for L2E algs should be (from highest to lowest):
1. all basic slice-flip-slice cases (including the double midge flip)
2. r U2 r U2 F2 r F2 l' U2 l U2 r2 (execute as r U2 r U2 x U2 r U2 3r' U2 3r B2 r2)
3. r2 F2 U2 r2 U2 F2 r2 (looks like PLL parity)
4. (F U' R U') (r2 F2 U2 r2 U2 F2 r2) (this case is missing from many alg sheets, including Speed Cube DB at the time of writing (!))
5. r U2 r2 U2 r' U2 r U2 r' U2 r2 U2 r and the inverse (diag checkerboards; this is the only L2E case where the best alg happens to be rU 2-gen)
6. all of the rest
I use yau and some of those algs distrupt the cross is there a sheet for l2e with cross?
 

Queenofkings

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Joined
Dec 30, 2020
Messages
3
I used to solve the 5x5 by doing the 4x4 first (ignoring the middle slice) then solving the 3x3 (big corners) to get the edges. That would bring me to the attached photo where I had a technique to swap the center edges until they were complete, finally solving the 3x3 with big centers to finish. That was years ago and I’ve forgotten what technique I used - muscle memory is giving me: u M u’ M’ after rotating the outer slices to get the configuration I want but of course that algorithm messes with all the centers so even if I get one right the others are screwed up. Does anyone have a suggestion? All of the center fixes I can find are for before the edges are done.
 

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BenChristman1

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I used to solve the 5x5 by doing the 4x4 first (ignoring the middle slice) then solving the 3x3 (big corners) to get the edges. That would bring me to the attached photo where I had a technique to swap the center edges until they were complete, finally solving the 3x3 with big centers to finish. That was years ago and I’ve forgotten what technique I used - muscle memory is giving me: u M u’ M’ after rotating the outer slices to get the configuration I want but of course that algorithm messes with all the centers so even if I get one right the others are screwed up. Does anyone have a suggestion? All of the center fixes I can find are for before the edges are done.
Go to 5:10 in the video. He uses a 6x6 for his example, but it works for any big cube.

 

Nmile7300

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Thanks for the suggestion, but that disrupts the edges. I’m looking for a way to move the center pieces without having to redo the edges.
It is much better and faster to solve the centers before the edges on big cubes. The only real exception is the Yau method and even then, that's just a few edges, not all of them.
 

xyzzy

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Joined
Dec 24, 2015
Messages
2,124
I used to solve the 5x5 by doing the 4x4 first (ignoring the middle slice) then solving the 3x3 (big corners) to get the edges. That would bring me to the attached photo where I had a technique to swap the center edges until they were complete, finally solving the 3x3 with big centers to finish. That was years ago and I’ve forgotten what technique I used - muscle memory is giving me: u M u’ M’ after rotating the outer slices to get the configuration I want but of course that algorithm messes with all the centers so even if I get one right the others are screwed up. Does anyone have a suggestion? All of the center fixes I can find are for before the edges are done.
Commutators. Some examples:
3R U 3R' 2U 3R U' 3R' 2U'
3R U 2R U' 3R' U 2R' U'
 

Queenofkings

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Dec 30, 2020
Messages
3
It is much better and faster to solve the centers before the edges on big cubes. The only real exception is the Yau method and even then, that's just a few edges, not all of them.
[/QUOT
It is much better and faster to solve the centers before the edges on big cubes. The only real exception is the Yau method and even then, that's just a few edges, not all of them.
Yeah that’s how I do it now, I used to use the 4x4 method I described when I taught other people how to do it it b/c it was easier for them sometimes.
 

ABCubeTutor

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Dec 17, 2020
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I used to solve the 5x5 by doing the 4x4 first (ignoring the middle slice) then solving the 3x3 (big corners) to get the edges. That would bring me to the attached photo where I had a technique to swap the center edges until they were complete, finally solving the 3x3 with big centers to finish. That was years ago and I’ve forgotten what technique I used - muscle memory is giving me: u M u’ M’ after rotating the outer slices to get the configuration I want but of course that algorithm messes with all the centers so even if I get one right the others are screwed up. Does anyone have a suggestion? All of the center fixes I can find are for before the edges are done.

my new method solves this, and also offers a new way to solve the 5x5x5. https://www.speedsolving.com/wiki/index.php/ABCube_Method

not to pat my own back, but there is a new method for solving big cubes, and it undoes parity and eliminates memorizing algorithms. it is https://www.speedsolving.com/wiki/index.php/ABCube_Method it is not great for speedcubing, but excels at large cubes, it does the centers last because the parities can be erased by a simple center slice turn,
 
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