
I think the answer used to be no if you were entering a CH show as wins at both CH and Open shows were counted but now if you are entering a CH show your open show wins don't count. hope that makes sense?
Here is the definition from Southern Counties.......
GRADUATE For dogs which have not won a Challenge Certificate or four or more First prizes at Championship Shows in Graduate,
Post Graduate, Minor Limit, Mid Limit, Limit and Open classes, whether restricted or not where Challenge Certificates were
offered for the breed.
POST GRADUATE For dogs which have not won a Challenge Certificate or five or more First Prizes at Championship Shows
in Post Graduate, Minor Limit, Mid Limit, Limit and Open classes, whether restricted or not where Challenge Certificates were
offered for the breed.