According to International Arbiter Eric Schiller, if the proper piece is not available, an inverted rook may be used to represent a queen, or the pawn on its side can be used and the player should indicate which piece it represents.
심판이 있는 정식 경기에서는 심판이 거꾸로 세운 룩이나 폰 두개 대신 적당한 정식 기물을 제공해야 한다.(According to International Arbiter Eric Schiller, if the proper piece is not available, an inverted rook may be used to represent a queen, or the pawn on its side can be used and the player should indicate which piece it represents.