Perceptual Puzzle #20- How Many Queens -

What is the maximum number of queens that can be placed on a 5x5 chessboard with no opposing queen being able to capture another and with a minimum of two white and black queens? For those who aren't familiar with chess, a queen can attack a piece any number of squares away horizontally, vertically, or diagonally. Note: You can move the white and black queens below the chessboard up onto the board to try different configurations.