From ncramer@bbn.com Sun May 12 18:05:24 1991 Return-Path: Received: from LABS-N.BBN.COM by life.ai.mit.edu (4.1/AI-4.10) id AA20500; Sun, 12 May 91 18:05:24 EDT Message-Id: <9105122205.AA20500@life.ai.mit.edu> Date: Sun, 12 May 91 18:01:38 EDT From: Nichael Cramer To: dn1l+@andrew.cmu.edu Cc: "Dale I. Newfield" , Cube-Lovers@life.ai.mit.edu Subject: ARGGHHH!! [was: 5by cubes] >Date: Sun, 12 May 91 17:12:57 EDT >From: Nichael Cramer >To: "Dale I. Newfield" >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 >>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 >>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. [I write]: >Dale, [...] #$%@!! I just realize that I answered the wrong question! My answer was to the question: "My cube is completely solved *except* that the 2 pieces marked `O' are flipped." (Sorry.) The right answer should be: The state of the cube is not: X|O|X|X|X X|A|X|C|X X|X|X|X|X X|X|X|X|X X|X|X|X|X But rather: X|X|X|X|X X|X|X|X|X X|X|X|X|X X|X|X|O|X X|X|X|B|X Where cubie "C" just "looks" like it's in the right place. You need an operator that rotates A->B->C->A. (Left as an exercise; hints available on request.) This will very likely leave an inconvenient number of edges flipped. For the answer to _this_ problem, see my last post. ;) Nichael-walks-with-the-red-face