I have been Euro-nymphing for about one year. I am pretty confident in using the larger anchor flies. ( rubber leg stone fly vladi worm ). I think the large anchors work best in the following conditions. Really deep water four feet or more ,windy days to maintain contact ,sudden drops in depth , extremely fast water to maintain contact. My first question is am I correct in the above assertions . My second question is what is the definition of a small anchor fly. The smallest I have used is a size 12 prince bh. What are the fishing conditons where a small fly works better and what patterns work best.