I have never seen a chicken with more than ten. Doesn't mean it can't happen though. The SOP does not mention it, but I would cull for it. Since you don't show it's up to you.
Walt
Well, I do show my Andalusians. It's been a few years but I did have some birds that had more than 10 primaries, more than 10 secondaries and 7 or 8 tail feathers (on each side). Not just six.
Thank you for your help.