I’ve updated FU Chess with two things after getting some excellent feedback from players:

1. Girlbosses - The last Queen on your side upgrades to a Girlboss, who is able to move like a Knight on top of all her regular properties.
2. Noble Kings (and Selfish ones!) - Clarification between two modes of play: Selfish Kings, which must be protected like in regular Chess; and Noble Kings, which may be sacrificed at will. See the documentation for more information!

As usual, these latest changes are live and readable on my website.