Here is a link to a post I made a few months ago, for someone else with a similar request:
https://www.backyardchickens.com/threads/bbs-breeding-and-dilute-white-splash.1608685/page-7#post-27444190
That post includes some discussion of how to use a chicken genetics calculator, but I don't think...
Breeding that rooster back to a pure Rhode Island Red will probably give some black chicks, some blue chicks, some red chicks with black in their tails (like Rhode Island Reds have), and some red chicks with blue in their tails.
I would expect the chicks to be split fairly evenly between the...