private void isPromotion() {
		Iterator<Position> pieceIter = Board.chessBoard.keySet().iterator();

		while (pieceIter.hasNext()) {
			Position pos = (Position) pieceIter.next();
			Piece inspectedPiece = Board.chessBoard.get(pos);
			if (!isSameTeam(pos)){
				continue;
			}
			if (!(inspectedPiece.unicode == "\u2659" || inspectedPiece.unicode == "\u265F")){
				continue;
			}
			if (pos.getyPos()== 7 || pos.getyPos() == 0){ //pawn이 맨 아래 혹은 맨 위에 있을때.
				executePromotion(pos);
			return;
			}
		}
		return;
	}