1: Start with a chocolate male and a female of the breed you want to end up with. All males will be non-chocolate (split chocolate), all females wil be chocolate.

2: Take a new male from the desired breed and cross with a chocolate F1 female. All cockerels will be split for chocolate. Don't use the pullets.

You could work with the split cockerels from step 1. Backcross to parent-type females gives 25% chocolate pullets and 75% non-chocolates. Don't use the latter. Go to step 2.

3: Take a split male with the best pattern and cross back to an F1 chocolate female. 50% of all offspring will be chocolate. Only a small percentage will be well marked.

4: To improve type and/or pattern cross a well marked chocolate male from the F3 with a new female from the desired breed. This will produce split males and chocolate females.

5a: These split males crossed back to new non-chocolate hens can produce 25% chocolate pullets and 75% non-chocolate animals. Don't use these.

5b: Their chocolate sisters crossed back to new non-chocolate males can only produce split cockerels. Like step 2.

6: Split males with chocolate females from steps 5a and 5b produce 50% chocolate offspring. Like step 3.

7: Not shown. Chocolates breed true.