Yes, it is 20, the result has Yes, it is 20, the result has been improved since this story was first published. As of 2010 it's been known that 20 is "god's number" for the Rubik's cube. See eg http://plus.maths.org/content/how-hard-rubiks-cube Reply
Yes, it is 20, the result has been improved since this story was first published. As of 2010 it's been known that 20 is "god's number" for the Rubik's cube. See eg http://plus.maths.org/content/how-hard-rubiks-cube