How to evaluate the character Lu Xu in A Knife in the Snow?

A talented young man escaped from the net because of the extinction of the gentry. He was taught chess by Huang San and became a blind chess player in Yongzi Lane. I met Prince Beiliang for the first time, talked for hundreds of times, and then was taken to the palace by King Jing 'an. From then on, I became a staff officer to help a king plan a temple. Lu Xu is especially good at temple planning. Before he died, Zhao Heng said, "This king treats you like a national." After Zhao Heng's death, he propped up the whole Jing 'an Palace with one person's wisdom and was called the successor of vertical and horizontal art by Nalan Youci.

Liu Xu was born a scholar, and his ancestors once won a place in Liyang officialdom. Because he said a few words for Chu when he was writing the History of Chu, he was framed by traitors, which led to the genocide of Lujia. Only Lu Xu can get out of this disaster, but he also ruined his eyes and vowed never to enter the official career again, making a living by playing chess in Yongzi Lane, Xiangfan.

Xu Fengnian entered Xiangfan. As luck would have it, he played a few games with Liu Xu. In these simple games, Xu Fengnian knew that the blind chess player was not an idle person, but he didn't take him out of Yongzi Lane after all. Xiangfan is King Jing 'an's territory, and Xu Fengnian knows everything about King Jing 'an, so after Xu Fengnian left, Heng Jing 'an took Liu Xu into his pocket.

Extended data:

For Liu Xu, a blind man, Xu Fengnian said more than once that he had neglected his eyes. However, Beiliang is not suitable for the development of Liu Xu. As for Jing 'an Wang Zhao Heng, it is even simpler. It is nothing more than an exchange of interests that both sides find acceptable. Liu Xu is worthy of King Jing 'an. He made Zhao Xun stand out from the crowd in Liyang Hall and then guided Zhao Xun to be his monarch.