From ncramer@bbn.com Sun May 12 17:18:48 1991 Return-Path: Received: from LABS-N.BBN.COM by life.ai.mit.edu (4.1/AI-4.10) id AA19875; Sun, 12 May 91 17:18:48 EDT Message-Id: <9105122118.AA19875@life.ai.mit.edu> Date: Sun, 12 May 91 17:12:57 EDT From: Nichael Cramer To: "Dale I. Newfield" Cc: Cube-Lovers@life.ai.mit.edu Subject: Re: 5by cubes >Date: Sat, 11 May 91 03:47:40 -0400 (EDT) >From: "Dale I. Newfield" >To: Cube-Lovers@life.ai.mit.edu >Subject: Re: 5by cubes >Cc: Cube-Lovers@life.ai.mit.edu > >(Don't read if you don't want!) Ditto! ;) >I am only having one problem with the 5x5x5 cube, though: > >X|O|X|X|X >X|X|X|X|X >X|X|X|X|X >X|X|X|X|X >X|X|X|O|X ^ ^ 1 2 >looking at the bottom of my cube, the 2 pieces marked O are swaped >sometimes, so that the face is still a solid color, but the sides are >swapped. [ ... ] I can't figure out what causes the swapping. Dale, What is wrong is that *one* of the inner planes [marked 1 & 2 above] are a quarter turn [i.e. 90dgs] out of phase. 1] The way I solve this is to turn one of the planes a quarter turn, [to get, for example the following]: >X|O|X|o|X <--(Where "o" is the other face of the "O" above.) >X|X|X|Y|X >X|X|X|Y|X >X|X|X|Y|X >X|X|X|Y|X ^ ^ 1 2 2] Then, to keep things straight in my head, I then "mark" the new position by replacing the center cubies in the turned plane to their correct positions (being careful not to mess with anything else --particularly the edge pieces): >X|O|X|o|X >X|X|X|X|X >X|X|X|X|X >X|X|X|X|X >X|X|X|Y|X ^ ^ 1 2 There's a relatively simple operator to do this, which I leave as an exercise for the reader. ;) (It's probably better to do this to all affected four faces, but you can save this until you have solved the edges.) 3] This leaves you five inner, non-central edges to solve. But it should be straightforward, so long as you be careful not to mess up anything else. Nichael