private void display() {
        for (int i = 0; i < board.length; i++) {
            for (int j = 0; j < board[i].length; j++) {
                if (getPieceAt(i, j) == PieceType.BLACK) {
                    System.out.print("[B]");
                } else if (getPieceAt(i, j) == PieceType.WHITE) {
                    System.out.print("[W]");
                } else {
                    System.out.print("[ ]");
                }
            }
            System.out.println();
        }
        System.out.println();
        System.out.println();
    }