A quick, simple and very effective dry/emerger pattern tied specifically for when the fish are fixed on the latter stages of buzzer life-cycle. Parachute and 'Klink' style flies will often do the job just as well, but I do like the attitude of the submerged part of this fly (a little deeper in the film, and a little more vertical) brought about by omitting the parachute hackle. Sometimes little things makes the difference.