Bowline on a bight advocate the use of a figure eight twisted version of the Bowline on a bight. This knot can be used to provide a toe hold in the middle of a rope; to make an emergency bosun's chair; and to create an upper rope "block" to make a crude purchase by threading the rope round an anchor point and then back up through the loop. It is sometimes used in sport climbing to tie into two anchor bolts independently. This knot is convenient when a dependable loop is required but neither end of the line is available. It's also commonly used
International Guild of Knot Tyers expressed a wish to be involved from the outset but due to distance were unable to attend the opening meeting. In 2001, archaeological historian Mike Loades attempted a reconstruction of a British Iron Age chariot. He called upon IGKT member Richard Hopkins for his knowledge and experience of how to use the binding and lashing materials available at that time - rawhide, hemp, and flax - and described his contribution to the project as "invaluable". This involves tying six basic knots - reef knot, sheet bend, sheepshank, clove hitch, round turn and two half-hitches and bowline - against the clock.