The link to the proof for the fewest number of moves -- "(Try to work this out for yourself, or see the proof here.)" -- is not working. It leads to a page that says 'access denied.'

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## Broken link?

The link to the proof for the fewest number of moves -- "(Try to work this out for yourself, or see the proof here.)" -- is not working. It leads to a page that says 'access denied.'