Message #1926

From: schuma <mananself@gmail.com>
Subject: Re: 24-cell solved
Date: Wed, 16 Nov 2011 01:09:00 -0000

Congratulations!

I pull out my notes, and find my order different. My order is: 2C faces, 3C edges, 6C corners, and then 1C inner corners, and the last step is 2C side-face pieces.

Before solving, I prepared a long macro for fixing the parity issue you mentioned, so that even if it occurs I’m not upset.

I’m wondering what is the "optimization" about the number of twists?

Nan

— In 4D_Cubing@yahoogroups.com, "Andrey" <andreyastrelin@…> wrote:
>
> Finally I’ve got some time to work on 24-cell. Solve was easy enough until the last step (6C pieces) where I discovered that my ideas of moving them don’t work: I can’t find easy operations that move 6C and don’t move sub-corners. But it happened that my operations for moving sub-corners don’t move corners! So I returned to the start of sub-corner positioning step and started to work on 6C instead.
> Total twist count (after optimization) is 21137. Half of them (10606) was spent on first 4 steps, and second half - on last two. The longest operation (3-cycle of 6C) was 139 twists long.
> And I was lucky that I didn’t meet parity problem at the end of 3C pieces stage: elementary twist of the cell gives even permutation of central 2C, but odd permutations of 3C and 6C. So it’s possible that you’ll need to re-solve eight 2C pieces when you think that you’ve done with them long time ago :)
>
> Andrey
>