On Zhuge Liang's Psychology of Being Engaged in Politics and His Way to Become Prime Minister

Why did Zhuge Liang choose to follow Liu Bei eventually in the face of the political situation in which Cao Cao, Sun Quan and Liu Bei contended for the domination of the country? We should analyze the reason deeply from his psychology of being engaged in politics. According to his own qualification, Zhuge Liang made his wisest choice to follow Liu Bei, not for the purpose of resurgence of the Han Dynasty, but because of Liu Bei's weaker position in military affair and manpower. Guan Yu was the biggest obstacle in Zhuge Liang's way to become prime minister, so Zhuge Liang did not hesitate to exterminate Guan Yu through Sun Quan's army and then dismembered some power of Fa Zheng making use of political trickery. Zhuge Liang became the prime minister through elaboration over ten years.