public void drawChessBoard() {
		int i = 0;
		for (char rank='8'; rank>='1'; rank--) {
			for (char file='a'; file<='h'; file++) {
				this.fields[i] = new Field(file, rank);
				this.fields[i].addMouseListener(this);
				this.add(this.fields[i]);
				i++;
			}
		}
	}