It is said that the situation at that time was like this. Cao Pi asked Cao Zhi to go for an outing, and then on the way to the outing, he happened to see two cows fighting. After seeing such a situation, Cao Pi may think of the scene in which Cao Zhi fought for power and profit with himself, but now he has become a winner, so he asked Cao Zhi to write a poem about a dead cow, but it cannot contain the word dead cow. In fact, Cao Pi did this to show his advantages.
Then Cao Zhi wrote a poem within the specified time, which not only fully met Cao Pi's requirements, but also expressed his own ideas and told Cao Pi his position in words. In fact, Cao Cao should bear a great responsibility for the struggle between Cao Pi and Cao Zhi. If Cao Cao hadn't been indecisive, he wouldn't have planted such an untimely bomb between the two brothers, which led to discord between the two brothers.
At that time, Cao Pi was the standard heir after the death of his eldest brother Cao Ang, but Cao Cao himself liked Cao Zhi very much, so he wavered between the two brothers, which led to the contention of his supporters for that position. Although Cao Pi won in the end, Cao Pi could never forget the dispute of that year. Seeing his powerful opponent, I wanted to get rid of him, so I always embarrassed Cao Zhi.