Wikipedia:Reference desk/Archives/Mathematics/2015 October 18

= October 18 =

Rubik's Revenge 4x4x4
So sorry to post here. We are going insane.

Please see:


 * http://www.speedcubing.com/chris/4-step3.html
 * http://tinypic.com/view.php?pic=2yv407s&s=8#.ViSK0dL49pQ

Steps 2 and 3 are done. It has become a 3x3x3.

The next step is then to make a cross that matches up with the sides. Done. Then one places the four corners pieces to complete the top level. Well, they are in the right place, but oriented incorrectly like in the tinypic. Do you see the nearest green-red-white top corner cube? They are all like that. That is not covered in the speedcubing step 3.

Does anyone have the algorithm? Many thanks to anyone who can help. Please save the cube from being ground into a fine powder and posted to Ernő Rubik to sprinkle on his breakfast cereal. Anna Frodesiak (talk) 14:26, 18 October 2015 (UTC)

Solved.

Now, a totally easy one:

It looks like this:
 * http://tinypic.com/r/145uf4/8

This algorithm at Step 3 doesn't work. It splits the centre 4:

r ² B ² U ² l U ² r ' U ² r U ² F ² r F ² l ' B ² r ²

Please help!!!!

Anna Frodesiak (talk) 03:28, 19 October 2015 (UTC)

Solved!

Sorry to have bothered you all. Anna Frodesiak (talk) 09:50, 19 October 2015 (UTC)
 * , now I understand what the first post was about. If that first picture is accurate, I take it you had to go back to step1, centers on the wrong side?
 * Alternative solution: http://www.helm.lu/cube/solutions/revenge/topcorners/topcorners.htm for the next time... Ssscienccce  (talk) 19:46, 20 October 2015 (UTC)
 * Ssscienccce, thank you so much. Good link. :) Anna Frodesiak (talk) 23:19, 23 October 2015 (UTC)