In 728 AD, the national selection of child prodigies was held in Chang 'an, the capital of China, and Li Longji, Emperor Xuanzong of the Tang Dynasty, personally took the stage to watch. There is a high seat under the tower for the prodigy to take the stage to answer questions. I saw a caller? Nine-year-old m took the lead in taking the stage, arguing with his children and defeating all his opponents. Tang Xuanzong was very happy. Will he become a member? M called him over and asked, "Is there a smarter child than you?" Member? M replied that his cousin Li Mi was only seven years old, and only then did he learn something higher than himself. Xuanzong immediately sent a flying horse to pick up Li Bi. At this time, Xuanzong was playing chess with Zhang, so he took chess as the topic and asked Zhang to try Li Bi's talents. Zhang said a sentence: "If the square is a chessboard, if it is round, if it moves, if it is alive, if it is static." Li Mi thought a little falsely and said, "If you are just, if you are round, if you use wisdom, if you are smart, if you are quiet, if you are proud." Xuanzong thought this answer was unique and profound. He quickly held Li Mi in his arms and said, "Because you are still young, being an official at the age of seven is not conducive to your intellectual development." Then he told Li Bi's parents to educate their children carefully, so that they would become the pillars of the country in the future. Later, Li Bi lived up to expectations and made great economic achievements, becoming the actual prime minister of Su Zong, Dai Zong and De Zong.