In the rules of this game it clearly says The player who captures all opponent's pieces of one kind, i.e. all eight pawns, both knights etc., wins the game. and it also says It is also possible to capture the opponent's king (and that finishes the game immediately since the king is the only piece of its kind). but I am guessing that the loss of a Queen would end the game as well, it being the only one of it's kind. so I would think it should be protected as much as the King. and I wonder as well if I promoted a pawn to Queen would give me two and loosing one would not end the Game If the same would be true of a King. promoting a pawn to a King would Give me two and I could then still loose one and not loose the Game?

Extinction Chess
This game (by the way, great invention of Mr. R. Wayne Schmittberger) follows the same rules as the standard Chess (starting position and piece movement) with these differences:

There is no check or checkmate.
The player who captures all opponent's pieces of one kind, i.e. all eight pawns, both knights etc., wins the game.
It is also possible to capture the opponent's king (and that finishes the game immediately since the king is the only piece of its kind). Because there is no check, a king can move to a square which is attacked by an opponent's piece or make a castling through such square.
Pawns can be promoted to any piece including a king. However, if the player promotes his/her last pawn, loses the game because he/she loses all pieces of one kind - pawns.