Expert: Tony D'Aloisio - 12/13/2007

Question
if you get a pawn to the other side can it turn into a queen when you already have your queen giving you two queens

Answer
Yes.  You can in fact (if you are fortunate enough to get all your pawns to the other side) promote all of them to queens--thus giving you 9 queens in all.  You are free by the way to promote all such pawns to whichever piece you like:  queen, rook, bishop or knight.  If you promote a pawn to a piece other than the queen, it is called underpromotion; the most common piece chosen for that is the knight, due to the fact that its move is unlike any of the other pieces (usually such an underpromotion is made to give check to the enemy king).