# Rubik's cube interesting questions?

The upper bound for the number of moves required to solve a regular Rubik's cube has been shown to be 20.

Two questions come to mind:

1. Does this result have more general significance?

2. What are the most pressing issue with regards to Rubik's cube (or generalizations) or its group?

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math.harvard.edu/~jjchen/docs/… here's a pretty good paper on the Rubik's Cube Group, for reference –  Eugene Bulkin Mar 1 '11 at 3:57
@Eugene: Nice reference, thanks! –  Andres Caicedo Mar 1 '11 at 4:07