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Date: Fri, 4 Dec 1998 11:26:10 -0700
To: Jacob_Davenport@scudder.com (Jacob Davenport)
From: Steve LoBasso
Subject: Re: (5x5x5) edge parity corrections
Cc: Cube-Lovers@ai.mit.edu
This should solve the edge parity problem by swapping the
edge F-Ru and edge F-Rd pieces.
R2 d L2 d L2 d' R2 u' F2 u2 F2 u' F2 L2 F l' F' L2 F l F
This move swaps only these two pieces and some centrals, but only within
their face. A variant of this move should be scalable to solve parity
issues in any NxNxN cube.
The only way I can think of to not have the parity problem, or at least not
require such a long series, is to solve centrals last. Another other idea
would be to spot the parity problem much earlier by counting edge flips.
Not very easy for a person to do, but I have seen it done in software for
normal 3x3x3 cubes. If it were were known very early in either the centers
first or layered solution, it would be trivial to fix.
>I don't like the edge parity correction move that I use in my solution, and
>I'm hoping that someone can give me a better one.
>
>The parity problem is found in 5x5x5 cubes (and 4x4x4 cubes, I understand)
>when two of the edges right next to the corners (which I call "wings") are
>switched. Some fairly simple moves can get all three edges in line with
>each other, but half the time two wings need to be switched. By the time I
>figure this out when doing a 5x5x5 cube, I've solved most of it, and my
>parity fixing move messes up many of the edges I've been working on.
>
>How do other people fix this problem?
>
>-Jacob
--
Steve LoBasso
Digital Technology International mailto:slobasso@dtint.com
500 West 1200 South or mailto:slobasso@hotmail.com
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