The white queen is placed on the square d1, the black queen on d8. Both queens occupy the center square on the back row which fits their color: white queen – light square; black queen – dark square.

The chess board needs to be rotated in a way that both players have a dark square in their respective lower-left corners. If the board has numbers and letters on the side, the a1-square needs to be the lower-left square for White.