During the Three Kingdoms period, Liu Bei wanted talents. I heard that there was a great man named Zhuge Liang in Longzhong who knew what was going on in the world without going out. Liu Bei personally invited him out of the mountain, hoping to achieve great things together, so he took Guan Yu and Zhang Fei with him.

In order to test Liu Bei's sincerity, Zhuge Liang refused to meet him until Liu Bei and others went to his hut for the third time. For Liu Bei's analysis of the current situation, he set a three-point world before he was a rookie. Later, Zhuge Liang went down the mountain to help Liu Bei establish Shu. History says three visits to the thatched cottage.

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Source: The History of the Three Kingdoms, Shu Zhuge Liang's Model: I worked in Nanyang, and I didn't ask Wenda to be a vassal in troubled times. The first emperor didn't treat his ministers with meanness, and his accusation was self-defeating. He took care of his ministers in the thatched cottage and was grateful for what had happened in this world, so he promised the first emperor to drive him away. After the value was overthrown, when I was appointed to the defeated army, I was ordered to be in danger: I have been here for twenty years.

I used to be a civilian, and I personally cultivated the fields in Nanyang. I just want to live in troubled times, and I don't want to get ahead among princes. The first emperor didn't wronged himself because I was humble. He visited me in the cottage three times. Asked me about world events, moved me to work hard and promised to work for my late emperor. Later, he failed and accepted the appointment when he lost in the military. It was twenty-one years ago that I was ordered to send a special envoy when the situation was critical.

From the winter of 207 AD to the spring of 208 AD, Liu Bei, who was stationed in Xinye (now Xinye, Henan Province), and his generals Guan Yu and Zhang Fei went to Longzhong, Dengxian County, Nanyang for three times to meet Zhuge Cao Lu and asked Zhuge Liang to come out of the mountain to assist him. Since then, it has become a much-told story, gradually becoming an allusion, and it contains "The History of the Three Kingdoms, Shu Zhi, Zhuge Liang Chuan, One Model". Now it is often used to express sincerity and repeatedly invite and visit sages with expertise.

Zhuge Liang stepped onto the political stage and devoted himself to Liu Bei, painting a strategic vision for him. "One divided into three" in Longzhong was highly praised by Liu Bei. It was under the guidance of this strategic decision that Liu Bei established the Shu-Han regime, which stood in balance with Sun Wu and Cao Wei.

Later, Longzhong Dui became a masterpiece, a representative work of China's political and military strategy. Among China's ancient strategic thoughts, Longzhongdui has exemplary value.

Cao Lu reactor is considered as one of the greatest strategic concepts in the history of China, and it has important research value in political strategy and strategy.

Baidu Encyclopedia-Three Visits to Shanzhai