# Message #1588

From: Andrey <andreyastrelin@yahoo.com>

Subject: Re: MagicTile Hexa 9 colors length 5 solved

Date: Wed, 23 Mar 2011 22:44:50 -0000

Nan, you are right. It’s really usual situation for 5^3 if you solve it by reduction to 3^3. When one combines edges using commutators it may happen that he has to swap two cubies (1,1,2) (second cubies of the edge, don’t know how you call them) and for that he makes single twist of some 2nd layer to restore parity (and continue with commutators).

I haven’t remembered this fact because I use different algorithms for the reduction: for 5^3 I combine edges before centers, and for {n,3} start with centers, then combine edges.

Andrey

— In 4D_Cubing@yahoogroups.com, "schuma" <mananself@…> wrote:

>

> Hi Andrey,

>

> Can you describe the parity issue? If it can appear in all {2n,3} 5 layers, then it should be in 5x5x5, which means it’s not that unusual. Thanks.

>

> Nan

>

> — In 4D_Cubing@yahoogroups.com, "Andrey" <andreyastrelin@> wrote:

> >

> > My result is 1464 twists. Log is here: http://games.groups.yahoo.com/group/4D_Cubing/files/MC7D/andrey_9col_5.log

> > There was unusual parity problem on the "edge recombination" stage. I don’t remember it from earlier solves, but it looks like it can appear on any "{2n,3}, 5 layers" puzzle.

> >

> > Andrey

> >

> > — In 4D_Cubing@yahoogroups.com, "Eduard" <baumann@> wrote:

> > >

> > > I used 3101 twists. I will comment later.

> > >

> >

>