From cube-lovers-errors@mc.lcs.mit.edu Fri Dec 4 16:49:43 1998 Return-Path: Received: from sun28.aic.nrl.navy.mil (sun28.aic.nrl.navy.mil [132.250.84.38]) by mc.lcs.mit.edu (8.9.1a/8.9.1-mod) with SMTP id QAA06282 for ; Fri, 4 Dec 1998 16:49:43 -0500 (EST) Precedence: bulk Errors-To: cube-lovers-errors@mc.lcs.mit.edu Message-Id: In-Reply-To: <872566D0.000F48EF.00@notes.dtint.com> 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 Orem, UT 84058 http://members.tripod.com/~slobasso (801)226-6142 ext.265 FAX (801)221-9254