"The aim of this puzzle is to free the tied cord from the figure-eight metal loop, without breaking or untying the cord."

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    $\begingroup$ If it is solvable I imagine explaining the steps adequately would require an image program or a how-to video... or an audience of knot theorists. $\endgroup$ – anon Jul 13 '11 at 8:27

This says it's impossible.

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  • $\begingroup$ Oh, the notorious Inta Bertuccioni! I should have remembered... $\endgroup$ – t.b. Jul 13 '11 at 13:32

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