gentoobro on Nostr: Is there an existing ruleset for chess where you keep playing all the way to one ...

Is there an existing ruleset for chess where you keep playing all the way to one remaining piece? Something like this: The normal rules for check and mate apply, except on mate the king has to be taken and then play continues like normal. Instead of stalling out with a stalemate for too many moves without a capture, shrink the board by one tile on every side, moving pieces inward if necessary, and keep playing. If a player has no legal moves, he can upgrade one piece to the next more valuable piece in order to move. Last man standing wins.