Chess variant on 10×8 board. It follows the same rules but it is played on a bigger board (10×8 squares) and each player starts with two kings (yellow mark) and two qeens (red mark).
Double King Chess on 10×8 board

What happends if Knight forks both kings at once. Or double check both kings?
Is it similar to the rules of Wild 9 from ICC "Two King Each"
https://www.chessclub.com/user/help/wild9

This game is a variant of classic Chess on 10×8 board. It follows the same rules but it is played on a bigger board (10×8 squares) and each player starts with two kings (yellow mark) and two queens (red mark).
Rules of game (variant). There is no check or checkmate, Kings can be captured like any other pieces. The player, who captures all opponent's kings, wins the game.
This game is a variant of classic Chess on 10×8 board. It follows the same rules but it is played on a bigger board (10×8 squares) and each player starts with two kings and two queens.
https://boardgamegeek.com/thread/1488261/double-king-chess-kids