Alpine butterfly

The alpine butterfly is a useful knot as it enables a loop to be tied in the middle of the rope. While you could use a figure-of-eight loop, it has the ability to unroll, and is less strong in this situation.

Pass the length of rope across your palm.
Wrap the rope around your hand to make a complete turn.
And once more.
Reach under the outermost loop with your other hand and pick up the middle loop
Pull the middle loop out and over the other two loops.
And then feed it back through the other two loops.
Pull the three parts of the knot (the two ends plus the loop) to tighten and set.

Tom Brennan : website@ozultimate.com : updated 20040729