Tripwire Puzzle

The object of this puzzle is to remove the string.

Despite it's relatively simple appearance, this puzzle is definitely not for the faint-hearted. Some of our most dedicated puzzle solvers have confessed to being on the verge of giving up on this one. Several have. One of our most respected "geniuses" conceded that it was only his stubbornness that kept him going. He admitted that although he could envision the solution quite clearly, he confessed: "I was damned if I could keep it all straight in my mind long enough to get the bloody thing off!".