I'm pretty sure 99% of fly fisherman have a go to pattern when fishing gets tough. This is Bob Quigley's Film Critic. A mayfly emerger pattern, I tied this as a BWO. Across the Midwest this is my go to/ favorite pattern to fish, on the spring creeks. It rides low in the surface film and can be fished during just about any small mayfly hatch in the Midwest. Tie some up in 18-20 and give them a try, you won't be disappointed.