Why can Zhuge Liang accurately predict that the winner will pass here 300 years later, and how did he set up this 9-word prophecy monument?

Because Zhuge Liang himself is a very wise man, very clever and proficient in divination and geomantic omen, it is not surprising to predict the future. The 9-word prophecy monument was set up because Zhuge Liang had just pacified the central and southern regions, so he decided to record his achievements and set up a monument, and wrote down nine Chinese characters, "Long live, he who wins us will pass this", which is both merit and prophecy.

Unofficial history once recorded that Zhuge Liang wrote a book "Lessons before the Horse", which predicted the occurrence of War of Resistance against Japanese Aggression and other things, but it was recorded by unofficial history after all, which was of no textual research value, but the history books recorded a 9-word prophecy tablet. So it can be called authentic.

At that time, Nanzhong in the Shu-Han rear area was in rebellion. Threatening the stability of the Shu and Han regimes. So Zhuge Liang bid farewell to the emperor and marched into South China with a great army. After the Shu army recaptured Nanzhong and made it completely stable. Zhuge Liang was naturally in a good mood, so he wrote on a stone tablet: "Long live, whoever wins me will pass this." When people asked him what this meant, Zhuge Liang just smiled and said nothing. Later, a few "experts" thought that this should be a prediction of the future.

Sure enough, three hundred years later, a general named Shi Wansui passed by in a war and found this ancient monument. Because long live the grandfather happens to be his name, Shi Wansui thought that someone predicted that he would surpass him and go further south, so the morale of the whole army increased greatly, thinking that their victory was the general trend, so he pursued them and finally caught the Qiang rebels.

Whether these nine words are true or accidental, we have no way to verify them. Perhaps only Zhuge Liang knows about them, but either way, it can be regarded as an anecdote.