Why was Sima Yi able to usurp Cao Wei's power, so what is the key to his success? Combined with the overall situation at that time, the main reasons are the following three points.
First of all, there is the problem of Cao Wei's monarch, we all know how powerful Cao Cao is, so when Cao Cao is still alive, it can be said that Sima Yi is not Cao Cao's opponent at all.
Later, when he came to Cao Pi, there was no big problem, and he strictly followed Cao Cao's teachings not to give Sima Yi too many rights, but when he arrived at Cao Rui, he broke the rules and began to gradually give Sima Yi a certain amount of military power, although under the interference of outsiders, Cao Rui was also in a state of half-belief in Sima Yi
But as everyone knows, Sima Yi at this time has already prepared a plan to seek power in his heart, if the descendants of the Cao family can have half of Cao Cao's shrewdness, it will not be passed down after only three generations.
The second is the existence of Zhuge Liang, and it is precisely because of Zhuge Liang that Sima Yi's use value can be reflected, if it is not for the fear of Zhuge Liang's Northern Expedition, which is about to threaten them Cao Wei, maybe Sima Yi will never have the opportunity to lead the army to fight, and looking at today, only Sima Yi can compete with Zhuge Liang.
Therefore, he had to choose to let him fight against Zhuge Liang, but in this way, although he successfully resisted Zhuge Liang, it also gave Sima Yi the best opportunity to sharpen his knife.
The last is Sima Yi's own forbearance, everyone knows that Sima Yi's forbearance ability is second to none in the entire Three Kingdoms, such as the fight with Zhuge Liang, he has been insulted by the other party many times, but Sima Yi can do it quietly
Let Zhuge Liang humiliate himself in every way, but if he couldn't hold back once, maybe Zhuge Liang's plan would have succeeded a long time ago. Or if Sima Yi hadn't hidden deep enough, he might have been killed by Cao Cao a long time ago.
Therefore, I believe that most of Sima Yi's success was obtained by his own forbearance.