OggyP wrote on Sat, Jul 22, 2023 08:20 AM UTC:Excellent ★★★★★
I created almost exactly this and was doing some research too see if it has been done before; I came across this website and found out it had except that I called it Four Kings Chess.
You can play this variant online multiplayer at: https://chess.oggyp.com (you will need to make an account though)
You can just test it out here without an account here: https://chess.oggyp.com/analysis/
https://git.oggyp.com/OggyP/chess-client