Why didn't the National Games of the Song Dynasty flourish?

It was the Song Dynasty when it was carved, which coincided with the demise of the Northern Song Dynasty and the establishment of the Southern Song Dynasty.

What was life like in the Song Dynasty? It should be said that the Song Dynasty was rich and weak. Song Taizu, the founding emperor of the Song Dynasty, was the reason why the national luck of the Song Dynasty was like this. Song Taizu became an emperor in a yellow robe, and he demolished the platform of the old Chai family. He set three ancestral precepts. To put it simply, first, don't kill the descendants of Chai, second, don't kill the literati, and third, don't kill the writers. With this ancestral motto, the emperors of later generations followed it, and their subjects were buried in the sea of books because of the scientific research system that began in the Song Dynasty, so there was Song Taizong's: the book has its own Yan Ruyu, and the book has its own golden house. However, the economic development and people's livelihood in the Northern Song Dynasty were very developed. At that time, China's gross national product reached about 80% of the world.

The reason for the demise of the Northern Song Dynasty was that the painter Song Huizong became emperor. The reason is not detailed. The status of the founding emperor of the Southern Song Dynasty is extremely embarrassing. He is the son of Song Huizong and the ninth brother of Song Qinzong. He is an unmarried woman. Originally, the emperor's seat was not his, but the shame of Jingkang was that he was the only one outside Song Qinzong's office. But things have changed. After he became emperor, how to treat Song Qinzong can explain him. After that, there were not only Liao, but also Jin in the north. Wanjin people were invincible in the world, and then the Yuan Dynasty, which even shot down Moscow, appeared. If it weren't for choosing Khan, it is estimated that they could have shot down the Apennine Peninsula and Iberian Peninsula, which could not be stopped by the Song Dynasty.