MT, interesting, learning some new every day, based on the method in investopedia, I draw some pink circles over your DRYS chart: 1st, draw a line from A to B 2nd, use B as center and draw 3 circles to represent 38.2%, 50% and 61.8% of this AB line note my circles are just aproximate since I don't have the correct tool
My posting is for my own entertainment, do your own DD before pushing your buy/call button