About four years ago, a fellow from New York -- with whom I had some email correspondence -- sent me the sketch you have posted. I could never remember how to tie it when on the river. In anticipation of the salmon fishing season last year, I made a copy and reduced it to about a 3" x 4" card that I had laminated in plastic to keep on my vest. Unfortunately, I did not get a chance to use it last season, but plan on putting it to the test this year.
That makes perfect sense to me.