The above two Czech Nymphs are pretty much identical except for one small ribbing/flash detail you may want to incorporate….note the sub ribbing on the top pattern. It is often seen on many or the original Czech Nymphs. It is one of two ribbings, one flashier and one that goes over the top to tie down the back strap. The second rib, you will see is wrapped up between the underlying rib. Also, note with the top pattern there is an added factor, a tungsten bead, up in the thorax area, tucked amongst the dubbing. Two ways to tie much the same pattern, both fish catchers. Remember presentation of the fly is as important as the fly pattern.