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 Post subject: anyone have an algorithm for this? (3x3x3 solving)
PostPosted: Tue Feb 27, 2007 7:07 am 
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So I've been playing around with a few different methods and a friend of mine from here told me about Roux. I like it and all, and am starting to get a hang of it, but... If I'm not careful about the orientation of the centers as I'm fixing the "bad edges" then the edges that look "good" may end up being "bad". Now, I know how to do this and can conciously avoid it by taking a few extra steps if things don't go as planned but...

I was wondering if anyone had an algorithm to fix it at the end. Sometimes it can go SUPER SUPER fast if I forget the placement of the centers until the end but... if the centers aren't correct using Roux when fixing the "bad edges", then I end up with a situation where...

all 4 edges on the middle slice are flipped. So, assume you're looking at a cube that is solved with the exception of white/green, white/blue, yellow/green, and yellow/blue. Those edges are all flipped.

I've got a few optimal cube solvers running a few different positions right now but... Those are going to take awhile. Does anyone have any algs to fix that, or am I going to have to take the extra time to prevent the problem during my solve?


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PostPosted: Tue Feb 27, 2007 7:33 am 
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I don't know of any fast algorithms, but I know this will work:

(D R2) (M U)x4 (M' U)x4 R2 D'


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PostPosted: Tue Feb 27, 2007 9:40 am 
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I came up with a nice conjugate a while ago:
http://cube.garron.us/algorithms.htm#snap7

U'RUR'M'U'M'U'M'U'M'U'RU'R'U (16 moves [SQTM])

(U'RUR') (M'U')x4 (RU'R'U)

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PostPosted: Tue Feb 27, 2007 3:03 pm 
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Thanks guys. Those algs look ugly long and I think it would be advantageous to me to ensure that I have my centers placed correctly. I'm gonna learn these anyways.

Actually, just tried Lucas' alg and it wasn't so bad. Thanks guys!


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 Post subject:
PostPosted: Tue Feb 27, 2007 3:27 pm 
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All 4 in M slice, as in UF UB DB DF?

Why not do: U M U M' U M' U M' U M U M U M U M U M2 U'

The last few turns can be optimised a little but I am just rushing here.

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 Post subject:
PostPosted: Wed Feb 28, 2007 1:15 am 
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Quote:
Actually, just tried Lucas' alg and it wasn't so bad.

Ooh! Thanks!

One less setup move:
(F R F') (M'U'M'U'M'U'M'U') (F R' F')
=(F R F') (M'U')x4 (F R' F')

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 Post subject:
PostPosted: Wed Feb 28, 2007 6:51 am 
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Pembo wrote:
All 4 in M slice, as in UF UB DB DF?

Why not do: U M U M' U M' U M' U M U M U M U M U M2 U'

The last few turns can be optimised a little but I am just rushing here.


Interesting algorithm. Thanks. Once my black DIY comes in, I'll see which ones of these I can do faster. ^_^


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PostPosted: Wed Feb 28, 2007 12:16 pm 
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That's just a basic BLD algorithm.

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 Post subject:
PostPosted: Thu Mar 01, 2007 12:44 pm 
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Pembo wrote:
All 4 in M slice, as in UF UB DB DF?

Why not do: U M U M' U M' U M' U M U M U M U M U M2 U'

The last few turns can be optimised a little but I am just rushing here.


And why not: U' M' U M2 (M' U)*4 M2 U' M U ?

(= U' M' U M U (M' U)*3 M2 U' M U )

Have fun!!

-Per

PS! U M' U M2 (M' U)*4 M2 U' M U' will also do :D

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 Post subject:
PostPosted: Thu Mar 01, 2007 2:34 pm 
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I don't get it. Guys, do you really think your algs are better than the one Lucas had already posted?

I'm btw using the same idea, just a little different and it's better for me:
(U L U' L') (M' U)*4 (L U L' U')

And I just noticed I can combine the first L' and M':
(U L U' l' U) (M' U)*3 (L U L' U')


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 Post subject:
PostPosted: Fri Mar 02, 2007 10:51 am 
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Stefan wrote:
I don't get it. Guys, do you really think your algs are better than the one Lucas had already posted?

I'm btw using the same idea, just a little different and it's better for me:
(U L U' L') (M' U)*4 (L U L' U')

And I just noticed I can combine the first L' and M':
(U L U' l' U) (M' U)*3 (L U L' U')


Hi :) I posted mine just to show a shorter alg solely with U and M turns. Nothing wrong about Lucas' algorithm! Thought some might prefer U,M only algs for various reasons: fingertrick friendly, and it's in the spirit of Roux-solving :-D

Btw, here is another nice one:
U M2 [M2 F2 M' F2,U] M2 U' which due to cancellation becomes
U F2 M' F2 U F2 M F2 M2 U' M2 U' - (12 stm, 16 ftm) This is probably not the fastest one but a very nice one, commutator-based.

All the ones given so far mess with centers :?

-Per

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 Post subject:
PostPosted: Fri Mar 02, 2007 10:55 am 
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as in rotate them you mean?

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 Post subject:
PostPosted: Fri Mar 02, 2007 12:59 pm 
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Pembo wrote:
as in rotate them you mean?


Yes. They rotate 2 or 4 centers as a "side effect" :roll:

-Per

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