Dude.I don't know much about anconas and I'm way more about seeing what I can do with just leghorns then mixing in other breeds.
I'd have to look into them more but I know the big difference is the pattern or at least to me it is. Ancona are simple mottled on black.
Exchequer are a bit of a mystery. I've had tons of people tell me they're the same. Just black with the mottled gene and then breed to extreme amount of white.
Someone else said they expect it is a slightly different mottled gene and their research said there was actually 3 or 4 different mottled genes.
I tried crossing exchequer to different patterns before to improve them but I couldn't get the right look back after they were crossed.
To me they bred like they were mottled but then had something else that modified the mottling to the patchy look.
My crosses went from exchequer to more of a regular mottled look and I never got the patchy look or the extreme amount of white back.
Others that seem to feather out with a closer look then got more white with every molt to an extreme.
By 2 1/2 to 3 years they were almost completely white. My exchequer never whited out like that.
Thats my challenge with them. Its not so simple as crossing them to another color then to each other or back to exchequer to improve type.
Thats my real fascination with them. Everyone that says theyre an expert on them don't seem to say what matches what I've experienced.
And I myself still don't understand them completely.
They seem really simple but have kept me scratching my head. That doesn't happen all the time for me so I'm intrigued beyond belief.
A book.
You and Chickat with tons of chapters...