Highwayman's Hitch

Also known as DRAW HITCH . The name of highwayman's hitch comes from the fact that this knot was supposedly used by robbers to insure a swift release for their horses reins and thus a rapid get-away. A single pull on the working end unties the knot, but the standing part can safely be put under tension.

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Source:

Owen, P. (1993). Knots - More Than 50 of The Most Useful Knots For Camping, Sailing, Fishing, And Climbing. Pennsylvania: Courage Books.