I am always looking for a better knot when tying leaders either in flyfishing or conventional fishing. Simple and holding since I fish in darkness most the time are a huge plus.
Found this one today. Japanese Figure 8 knot.
http://thelimpcobra.com/2015/03/05/fishing-knots/
Going to start trying with my leaders to see how it fairs. Looks very promising. Way simpler than a blood knot for me and seems smaller than a surgeons.