Note

Chocolate-color is sensitive  to discoloration when exposed to sunlight. Somewhat lighter color at the tips of the wing-flights and slight color variations in the chocolate-colored and patterned feather-parts are therefore permitted

Color and pattern male

Head: orange-red.

Neck: hackle warm orangey golden-yellow, each feather with a chocolate middle-stripe, running almost parallel to the edge, ends in a point near the tip; shaft chocolate; front of the neck chocolate.

Back, shoulders and wing-bows: carmine-red.

Wings: front chocolate ; greater-coverts chocolate forming a wing-bar when the wing is closed. 

Primary-flights: chocolate with a deep reddish-brown narrow lace along the outer-web.

Secondary-flights: chocolate with a deep reddish-brown lace along the outer-web, forming a reddish-brown wing-bay when the wing is closed; feather-end chocolate. 

Saddle-hackle: similar to the neck-hackle, a slightly deeper shade is allowed, equality is desired.

Tail: main-feathers, sickles and coverts chocolate, smaller-coverts warm orange-gold yellow laced; moderate sheen in the tail is desirable.

Breast: chocolate, some lighter lacing allowed.

Thighs, belly and fluff: chocolate, some lighter lacing allowed in thighs.

Down: brownish-gray.

Serious faults

Considerably too red-brown or grey-yellow ground-color. Too dark in hackles or too faint middle-stripes. Much too dark chocolate-color. White in tail and wing-flights.

Faults

Serious faults to a lesser degree. Irregular and/or patchy chocolate-color. Too light and incomplete colored wing-bay.

Color and pattern female

Head: deep yellowish-brown orange.

Neck: hackle orangey-yellow, each feather with a broad chocolate middle-stripe, running parallel to the edge, ends in a point near the tip; shaft black; front of the neck similar to the breast.

Back, shoulders, saddle and wing-coverts: each feather warm greyish yellow-brown sharpley chocolate multiple laced, parallel to each other and to the outline.

Tail: main-feathers chocolate, both upper feathers with warm grayish-brown; coverts similar to the back.

Primary-flights: chocolate with a brownish-gray narrow lace on the outer-vane.

Secondary-flights: inner-vane chocolate, outer-vane brown with chocolate multiple lacing running approximately parallel to the feather-outline.

Breast: similar to the back, lacing extend to the throat.

Flanks, thighs and belly: soft greyish yellow-brown with chocolate multiple lacing.

Fluff: soft greyish-brown.

Down: greyish.

Serious faults

Too weak or incorrect lacing on the back, shoulders,breast, saddle-cushion and wing-coverts. Rust color on wings. Peppered pattern instead of clear lacing. Much too dark chocolate-color.

Faults

Serious faults to a lesser degree.

Genetic code: https://kippenjungle.nl/Overzicht.htm

Website from Henk Meijers with all available information regarding chicken genetics including the world famous: 

Chicken Color Calculator