In this game of setup chess I found that my opponent placed their king, after placing all their other pieces, such that I could place a queen on the same file as the king, which initially I thought was checkmate, given that my opponent would need to pass their turn, but turned out it was just check. I then placed another queen on the same diagonal as the enemy king knowing that it was double check so that the king would need to move during the moving stage of the game, and then I just placed another queen and a rook to cut off the enemy kings escape squares for checkmate.
My King is in my setup material as I checkmated my opponent before I would have finished placing all my pieces so that the game ended while my King was still in my pocket.
https://www.chess.com/variants/setup-chess/game/90766876/18/3
In this game of setup chess I found that my opponent placed their king, after placing all their other pieces, such that I could place a queen on the same file as the king, which initially I thought was checkmate, given that my opponent would need to pass their turn, but turned out it was just check. I then placed another queen on the same diagonal as the enemy king knowing that it was double check so that the king would need to move during the moving stage of the game, and then I just placed another queen and a rook to cut off the enemy kings escape squares for checkmate.