Wow! I've never seen silkie-feathered ameraucanas before!
silkied splash x silkied splash = 100% silkied splash
silkied splash x smooth black = 100% smooth blue, carrying silkie gene
silkied splash x smooth blue = 50% blue, 50% splash, with 100% smooth feathered, carrying silkie gene
silkied splash x f1 black = 100% blue, with 50% smooth carrying the silkie gene, 50% silkied
silkied splash x f1 blue = 50% blue, 50% splash, with 50% smooth carrying the silkie gene, 50% silkied
f1 blue x f1 black = 50% black, 50% blue, with 25% smooth and not carrying silkie gene, 50% smooth but carrying the gene, and 25% silkied
f1 blue x f1 blue = 25% black, 50% blue, 25% splash, with 25% smooth and not carrying silkie gene, 50% smooth but carrying the gene, and 25% silkied