I must correct myself !!!
Exchequer are not on E/E but on ER/ER with Ml/Ml (because of the yellow feet) with a mutation on the mottling gene (mo^pi) or with an extra gene (Pi/Pi) this last is not yet cleared out !
* "Pi" = Pied
Allora che hanno "quasi" lo stesso genotipo ma differente fenotipi !
-ER/ER Ml/Ml S/S * S/- mo^pi/mo^pi (o mo/mo Pi/Pi) => pure Exchequer (as Livorno)
-ER/ER Ml/Ml S/S * S/- mo^pi/mo (o mo/mo Pi/pi+) => phenotype in between
-ER/ER Ml/Ml S/S * S/- mo/mo (o mo/mo p+i/pi+) => pure Black with mottled (as Ancona)