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
Rolling hitch of several other names, although some sources fail to differentiate by using a separate name. This version is preferred when attaching a rope to pole or rod. It is effectively a clove hitch with an extra initial turn. This version is preferred when attaching rope to another rope. The first two turns create an awning hitch − a temporary hitch used by riggers when adjusting tent lines. These first two turns are merely a subtle rearrangement in the position of the turns of #1734. This is tied exactly as #1734, but with the final hitch in the opposite direction. It