Do you mean in a set? That is so you can promote to a queen if you already have one on the board.
If you mean in general, that is just one of the rules of promotion. You can actually have more than two if your promote multiple times, though that is overkill.
A chess set with two extra queens, a white and a black one, is convenient in case a chess player gets another queen by promoting a pawn and still have his first queen. Thus the players don't need to stop the game and the clock until an extra queen is found by the help of the arbiter.
Here is an interesting topic on games with many queens:
https://www.chess.com/article/view/kings-and-queens
Why are there two queens in tournament chess? You already have enough checkmating material.
I'm really confused because in "tournament chess" there aren't two queens. Only one. If you're talking about the extra queen situated next to the board it is for promotion.
Sometimes the extra queens get used. For example:
http://www.chessgames.com/perl/chessgame?gid=1106430
But what about three queens?
when i was a kid someone taught me that when you run out of queens you can use an upside down rook as a queen.
Better don't try it in rated tournaments.
when i was a kid someone taught me that when you run out of queens you can use an upside down rook as a queen.
Better don't try it in rated tournaments.
Upside rooks confuse me
when i was a kid someone taught me that when you run out of queens you can use an upside down rook as a queen.
I wish you couldn't in USCF games, but in USCF rated games that are NOT FIDE rated, you can.
In FIDE, an upside-down rook is a Rook! Plain and Simple!
Why are there two queens in tournament chess? You already have enough checkmating material.