About Tristan:
VII group because: his grand grand father (good word?) is Ajax Břevnovská stopa.
Usually are dogs in groups or lines from father. Father is there from his father,...etc. This grand grand...is in pedigree of male very often (or most often). But it is not only one view. This first reproductor must have perfect quality in something, he must be typicle in something. About Ajax and Alan Břevnovská stopa: here we look at thier quality, they was in breeding more than other related males.(Don´t forget, it was x years ago and in this time we had not much dogs for choosing. The breeders was happy when was in breeding 20 males!!!)..This group is a little different from other population. But it is not closed process. We can (maybe we must?) rebuild this group. Maybe to find some males from this line, which are in other countries, they are health, good, which can have quality pups,... And which are not in czech breeding in past.... (offsprings of exported pups-dogs)
I am very sorry, my english is not good and I can´t explain on 100% what I mean.
If you will want more info abou it, you must ask leader of our club
)))