Who does Zhuge Liang refer to in his pre-school lesson?

Refers to Yuan Shu. Yuan Tiangang and Zhuge Liang are two figures in the previous horse lessons. Yuan Tiangang's divination combined with Zhuge Liang's art of war foresaw the end of the Three Kingdoms. So the meaning of this sentence is that Zhuge Liang combined the art of war with divination, once accurately predicted the trend of the world trend, but now it has declined, and Yuan Shu is the person whose world trend is declining. Zhuge Liang's pre-horse lesson refers to Yuan Shu.