Steel, steel, and more steel... 14 of the fish caught on the Ronde this year by my clients were on the Assassin fly I tie, using a floating line. Hands down the most effective pattern this year on the Ronde by a wide margin. This is my favorite picture of the entire season.
You can get a pretty good look at the fly in several of these pics.
This was the first fish of the year caught about the fifth swing into the first day of pre fishing.