Characteristic of the Ridgebacks is the Ridge. 

The Ridge, also Aalkamm mentioned, is formed by hair, which grows “against the hair line” over the back from the "Schulterblatt" (shouldersheet?) to the crest. 

The forms developing from it should be clearly distinguished from the remaining skin and well visible. 
As regular a form as possible is desirable; on both sides of the spinal column symmetrically. 
With the form of the Ridge serious differences are to be determined, at least in what “permits” is and which not. 

Like that only very few variants are permitted variety, with the Thai against it are very large those with the RR with the distribution of the breed permission. Thus one differentiates 8 different basic forms with him