From cube-lovers-errors@mc.lcs.mit.edu  Tue Sep 21 20:52:44 1999
Return-Path: <cube-lovers-errors@mc.lcs.mit.edu>
by mc.lcs.mit.edu (8.9.1a/8.9.1-mod) with SMTP id UAA28450
for <cube-lovers-outbound@mc.lcs.mit.edu>; Tue, 21 Sep 1999 20:52:43 -0400 (EDT)
Precedence: bulk
Errors-To: cube-lovers-errors@mc.lcs.mit.edu
Date: Thu, 2 Sep 1999 12:57:37 -0700 (PDT)
From: Tim Browne <ue451@victoria.tc.ca>
To: Noel Dillabough <noel@mud.ca>
Cc: "Cube Lovers List (E-mail)" <cube-lovers@ai.mit.edu>, arensb@cfar.umd.edu
Subject: Re: Square One Parity fix
Message-Id: <Pine.GSO.3.95.iB1.0.990902124509.4819A-100000@vtn1>

On Fri, 20 Aug 1999, Noel Dillabough wrote:

> I have just finished modelling the Square One puzzle in Puzzler and in
> testing found a flaw in my solution.  In order to correct a parity problem
> (where you have to swap only 2 pieces rather than 4) I do the following
> move:
>
> (in Arensburger notation:)
>
> R,t3,b3,R,t1,b2,R,t2,b2,R,t6,R,b-2,t-2,R,b-2,t-1,R,b-3,t-3,R
>
> This scrambles the cube up a bit but makes it solvable using standard moves.
>
> There must be a better move than this!  If anyone knows a better way to swap
> two pieces, let me know.

For starters, you'd be amazed what a B6 added to the beginning or end of
this pattern will do. :-) Alternatively, you could skip over that and
simply add two dual edge swaps by appending something like
t1,R,t-1,b-1,R,t6,R,t1,b1,R,t3,b3,R,t-1,b-1,R,t6,R,t1,b1,R,t-4,b-3
to the beginning or end of your pattern. L8r.

--
Cubic Puzzles - The SIMPLEST Solutions          |       HIT Jedi
http://www.victoria.tc.ca/~ue451/solves.html       | Use the Force, Mike!
--------------------------------------------------------+-----------------------
"No thanks. I'm trying to cut down." - Michael Garibaldi

From cube-lovers-errors@mc.lcs.mit.edu  Tue Sep 21 22:01:15 1999