Quote Originally Posted by lodka View Post
Цепочка is grammatically correct in all regions.
I agree with that but that only be true for "official" Russian.
I have an example for you.
Long time it was considered grammatically correct to say that word "кофе" has a masculine gender. But many people were using neutral gender. Finally linguists "approved" both genders to be grammatically correct, so it's a matter of perspective.
The word "цепочка" comes from Old Slavonic "чепочка" which comes from a word "чеп". This is a very old word and the stress of the word also comes from that time, those times people didn't have official linguists and spoken in different "dialects", so I don't see why it couldn't be a "dialect", theoretically.