Zhuge Liang, known as the "Wolong", was resourceful and talented, and was the best among the strategists of the Three Kingdoms.
There were many strategists in the Three Kingdoms, but there were very few strategists who could compete with Zhuge Liang, but Sima Yi was one. Sima Yi, known as the "Tsukasa Tiger", lurked in the Cao family for a lifetime, and only in his later years did he jump back and successfully usurp cao's jiangshan.
Since ancient times, there has been a saying that dragons fight for tigers, and Zhuge Liang, the Crouching Dragon, and Sima Yi, the Tsukasa Tiger, have arranged for them to fight in a decisive battle in the darkness. Sima Yi was Zhuge Liang's lifelong enemy, and he was very restrained by Zhuge Liang.
Zhuge Liang is an offensive player, and Sima Yi is a defensive player, Zhuge Liang attacks, Sima Yi defends, which makes Zhuge Liang a headache.
Only when the opponent makes a move, can he find the flaw and defeat the opponent, but Sima Yi just does not make a move, and he and Zhuge Liang are exhausted, so that Zhuge Liang is helpless against him.
After the failure of Zhuge Liang's first Northern Expedition, in order to allow the Shu army to withdraw as soon as possible, Zhuge Liang personally broke off and staged an "empty city plan" and successfully scared Sima Yi away.
Did Sima Yi really not know that this was an empty city? Actually, he knew. Since Sima Yi knew that Zhuge Liang was bluffing, why did he let him go? Could it be that Sima Yi was afraid of Zhuge Liang? This is not the case.
Sima Yi was not afraid of Zhuge Liang, but of Cao Rui. The Cao family has an ancestral precept, that is, to guard against Sima Yi and kill Sima Yi when necessary.
Before Cao Cao died, he told Cao Pi that you should beware of Sima Yi, and before cao Pi died, he told Cao Rui that you should be wary of Sima Yi, so Cao Rui has been wary of Sima Yi and not let Sima Yi become bigger and stronger.
Cao Rui was so jealous of Sima Yi, why didn't he kill him? In fact, it was very simple, Cao Rui needed Sima Yi to resist Zhuge Liang. Zhuge Liang kept going on the Northern Expedition, and the State of Wei had no talents to rely on, and could only rely on Sima Yi.
Therefore, Cao Rui's attitude toward Sima Yi was that Zhuge Liang came, let Sima Yi go out of the mountain, Zhuge Liang left, let Sima Yi go home, use it when it should be used, and use it when it should not be used.
Cao Rui's little nine nine, Sima Yi also knew, so he also relied on Zhuge Liang, as long as Zhuge Liang did not die, Sima Yi would not die, so when the empty city was counted, Sima Yi released Zhuge Liang, which also saved himself.
If Sima Yi killed Zhuge Liang, Cao Rui would kill Sima Yi, because Sima Yi was no longer worth it.
When Sima Yi fought against Zhuge Liang, he never confronted Zhuge Liang head-on, and always maintained a state of balance, Zhuge Liang could not do anything with him, sima Yi did not take zhuge Liang, this is the result that Sima Yi wanted, so that he could achieve balance and there was no danger to his life.
Sima Yi walked on thin ice all his life, trembling, and there were countless eyes staring at him behind his back, as long as he was slightly careless, he would face death.
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References: Romance of the Three Kingdoms, Book of the Later Han Dynasty, Book of Wei, etc