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How is a move defined? Is it rotating a single side by any amount? If I hold the central 'column' of one face and rotate both outside columns simultaneously, is that one move or two?

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That example is two moves. Come on, it’s not that hard.

Well, it's two moves relative to the centre column, but it's a single move relative to each of the outside columns. I was just interested in whether the rules are 'physical' or 'theoretical'.

Certainly with a good cube you _could_ hold the outside and push to twist a center slice. From www.cube20.org -- "We consider any twist of any face to be one move (this is known as the half-turn metric.)"

Also, "New results: God's Number is 26 in the quarter turn metric!"

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