I would love to give an out of parity Rubix Cube to one of those Rubix Cube 
savants and see how long it taked to figure out they cannot solve it! ;-P

Bob S

> On Mar 7, 2018, at 08:22 , Ralph DiMola via use-livecode 
> <use-livecode@lists.runrev.com> wrote:
> I don't know about the 9 puzzle but I suspect it's like the 15 puzzle. The
> 15 puzzle and Rubics Cube have parity. If the 15 is out of parity it can
> never be solved. The same for Rubics Cube, if you say switch 2 edge pieces
> or rotate 1 corner piece it's not solvable.
> Ralph DiMola

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