Using your Head is Permitted

August 2010 solution

A demonstration with a less flimsy version of this puzzle is available here. My thanks go to Shai Hirsch who used an Objet 3D printer to construct this amazing model.

Among the many e-mails I received this month, one I'd like to mention particularly came from Tudor Zamfirescu, who pointed out to me that several years ago he published a paper describing the solution to this very problem. The paper is available online.

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