Cinnamon makes sexing easy

Due to the sex-linked inheritance of cinnamon, both cinnamon opalines on the right will be hens, the green opalines (a third is at the other end of the nest box) will be cocks.

Assuming dad is not split for yellow (he may be);

Red fronted cinnamon / opaline cock x red fronted yellow opaline hen gives;

Cocks

50% Green opaline / yellow cinnamon

50% Green /yellow cinnamon opaline

Hens

50% Cinnamon / yellow

50% Cinnamon opaline / yellow

All red fronted. But why some are more red than others...I don't know.