TuMicks,
There is a total of four qualifying legs required to title at the AKC JH level. The jump to AKC SH requires multiple marked retrieves at distances beyond those required for JH on both land and water, blind retrieves on land and water, a "walk up", a diversion without switching, and honor of a working dog whilst remaining steady. Line manners at a higher level arr expected and steadyness at the line without any physical restraint of the dog and a clean delivery to hand of a bird deemed fit for the table (not hardmouthed) by the retriever as determined by the judges. It is quite a significant jump in overall skill levels required for the retriever / handler team, but well worth the effort and time spent in strenthening the bond with ye retriever.
Cheers,
Irishwhistler