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Hurray Ray!!! That shows some serious dedication! Any idea of how many
hours it took this time?
So you'll be starting university at age 17? That's young too. Given how
well you battled and beat this beast, my guess is that you'll find
university to be a piece of cake though that may depend upon your choice
of major.
I don't think that scrambling or rotation moves should affect twist
counts, so clearly you've cracked the 20K twist barrier, which is also
extremely impressive, and possibly even a first. You may even be the
first person to solve this puzzle more than once which is something I
never expected to see.
Good luck with the other 4D puzzles. Since you are clearly not easily
frightened by big challenges, I also suggest that you consider the 24-cell.
Congratulations on your very impressive achievement, Ray!
-Melinda
On 9/4/2014 3:03 PM, Ray Zhao thermostatico@gmail.com [4D_Cubing] wrote:
>
>
> Hi all,
>
> I got pretty bored one day so I decided to retry solving the 120-cell
> for the heck of it. My previous attempts got me to layer 4, but I
> decided to start from scratch again because my 4D CFOP, 120-cell
> edition, improved a little since then (2011). =P Method's here (for
> 3^4), though I might edit it in the next few days or weeks.
> http://wiki.superliminal.com/wiki/3%5E4#Sheerin-Zhao_Method_.28Hybrid.29_V1
>
>
> It was finally solved on Aug 30, 2014. Started Aug 13, 2014. Including
> the 1k move scramble, it's just over 20k moves.
>
> Of course, the fact that I didn't solve it a long time ago meant that
> I couldn't break the age record of 15 since I'm 16 now, but at least I
> got to beat the shortest. I also beat myself; by the time I was on
> layer 4, the solution seemed to have become almost 40% more efficient
> than the 2011 attempt though I probably have to check that number.
> Half of the reason for the efficiency was the use of RKT, or limiting
> moves to only two cells, pretending one of them is a megaminx (a bit
> hard to explain. the wiki link mentions it as
> half would be because I strived to learn how the 3c and 4c turns work,
> and pressed undo many times just to find the smoothest insert of an
> f2l pair.
>
> Because CFOP uses pretty intuitive F2L, what's macros? Roice's program
> works nicely, and I have to admit it probably has the easiest and most
> comfortable controls, but that's probably because I used it for weeks
> straight. Its similar colours have got me into trouble multiple times,
> though, but how do you pick an arrangement with 120 contrasting
> colours so that you don't get a case with a 3c grey-grey-grey piece?
> (I hated that) Perhaps even a variation of 4-colour rule would work
> here. ^_~
>
> As for dur ing the solve, the beginning was pretty frustrating since
> pieces would seem to be everywhere; most of the time was spent finding
> the piece since I'd rotate the puzzle, turn on the layer, and forget
> the exact position that the piece was in.
>
> By the time layer 4 was half-solved, things felt extremely restricting
> since some turns would have the same effect as exposing a solved slot
> on the 3^3. In fact, I screwed up multiple times and had to refix
> multiple pairs because I had taken them out by accident. That by
> itself probably added around 2k moves.
>
> The worst part was the very end, when there seemed to be only one
> flipped edge; the other one was actually wedged between two greys in
> layer 5. @_@ At the same time, it was kind of exciting to be able to
> find a solution to that case; filled up a little piece of scrap paper
> with the steps and all. =P
>
> So that's pretty much all about the solve. .-. Roice encouraged me to
> post so yeah. Not sure what puzzles I'll go for next (aka improve on),
> considering that Uni registration is this year (w00t) though duoprisms
> and penteracts sound nice. :)
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">
Hurray Ray!!! That shows some serious dedication! Any idea of how
many hours it took this time?
So you'll be starting university at age 17? That's young too. Given
how well you battled and beat this beast, my guess is that you'll
find university to be a piece of cake though that may depend upon
your choice of major.
I don't think that scrambling or rotation moves should affect twist
counts, so clearly you've cracked the 20K twist barrier, which is
also extremely impressive, and possibly even a first. You may even
be the first person to solve this puzzle more than once which is
something I never expected to see.
Good luck with the other 4D puzzles. Since you are clearly not
easily frightened by big challenges, I also suggest that you
consider the 24-cell.
Congratulations on your very impressive achievement, Ray!
-Melinda
ail.com"
type=3D"cite">
I got pretty bored one day so I decided to retry solving the
120-cell for the heck of it. My previous attempts got me to
layer 4, but I decided to start from scratch again because
my 4D CFOP, 120-cell edition, improved a little since then
(2011). =3DP Method's here (for 3^4), though I might edit it
in the next few days or weeks. href=3D"http://wiki.superliminal.com/wiki/3%5E4#Sheerin-Zhao_Method_.28Hybr=
id.29_V1">http://wiki.superliminal.com/wiki/3%5E4#Sheerin-Zhao_Method_.28Hy=
brid.29_V1
2014. Including the 1k move scramble, it's just over 20k
moves.
Of course, the fact that I didn't solve it a long time ago
meant that I couldn't break the age record of 15 since I'm 16
now, but at least I got to beat the shortest. I also beat
myself; by the time I was on layer 4, the solution seemed to
have become almost 40% more efficient than the 2011 attempt
though I probably have to check that number. Half of the
reason for the efficiency was the use of RKT, or limiting
moves to only two cells, pretending one of them is a megaminx
(a bit hard to explain. the wiki link mentions it as <RK,
A->). The other half would be because I strived to learn
how the 3c and 4c turns work, and pressed undo many times just
to find the smoothest insert of an f2l pair.
Because CFOP uses pretty intuitive F2L, what's macros? Roice's
program works nicely, and I have to admit it probably has the
easiest and most comfortable controls, but that's probably
because I used it for weeks straight. Its similar colours have
got me into trouble multiple times, though, but how do you
pick an arrangement with 120 contrasting colours so that you
don't get a case with a 3c grey-grey-grey piece? (I hated
that) Perhaps even a variation of 4-colour rule would work
here. ^_~
frustrating since pieces would seem to be everywhere; most of
the time was spent finding the piece since I'd rotate the
puzzle, turn on the layer, and forget the exact position that
the piece was in.
restricting since some turns would have the same effect as
exposing a solved slot on the 3^3. In fact, I screwed up
multiple times and had to refix multiple pairs because I had
taken them out by accident. That by itself probably added
around 2k moves.
only one flipped edge; the other one was actually wedged
between two greys in layer 5. @_@ At the same time, it was
kind of exciting to be able to find a solution to that case;
filled up a little piece of scrap paper with the steps and
all. =3DP
encouraged me to post so yeah. Not sure what puzzles I'll go
for next (aka improve on), considering that Uni registration
is this year (w00t) though duoprisms and penteracts sound
nice. :)
=C2=A0
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Hi Allen,
I think what you are asking for is impossible because of parity
restrictions. 4C corner positions can not have odd parity because a 90
degree twist results in two 4-cycles of corner positions (even parity). An
algorithm that produced a single 2-cycle would produce odd parity.
On the 3D cube, you can swap just two corners, but only if you also swap
two edges! In 4D, you can do something similar with 2C and 3C pieces, but
you are out of luck with 4C corners. It should be possible to make a
sequence that swaps two sets of two corner pieces though. To dig deeper, I
recommend the 2009 thread on this group titled "Parity on MC m^n".
https://groups.yahoo.com/neo/groups/4D_Cubing/conversations/messages/624
Also related, but not exactly what you want... You can twirl (in place)
two corners connected by an edge. See the sequence at the bottom of this
page.
http://www.superliminal.com/cube/solution/pages/series_hints.htm
Cheers,
Roice
On Sun, Sep 7, 2014 at 8:56 PM, ohara_allen@yahoo.com [4D_Cubing] <
4D_Cubing@yahoogroups.com> wrote:
>
>
> Does any one have an algorithm for swapping two corners pieces on the 4d
> cube that are connected by an edge? I don't need it to preserve the edges
> or faces. It doesn't matter what the orientations of the corners are, so
> long as those two corner pieces are the only corner pieces that swap.
>
>
> Has anyone encountered this situation before? It should be possible, I
> just can't seem to deduce such an algorithm.
>
>
>=20
>
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order-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"=
>
=20=20=20=20=20=20=20=20Does any one have an algorithm for swapping two corners pieces on =
the 4d cube that are connected by an edge? I don't need it to preserve =
the edges or faces. It doesn't matter what the orientations of the corn=
ers are, so long as those two corner pieces are the only corner pieces that=
swap.
Has anyone encountered th=
is situation before? It should be possible, I just can't seem to deduce=
such an algorithm.