Yuan Shao had six chances to save Guandu's defeat. Why did he say it was all perfectly avoided?

In history, Yuan Shao was an ambitious and foolhardy master. Although there are many smart people under his command, this man is not good at employing people, and his nature is soft, so he can't achieve great things, so he was completely defeated in the battle of Guandu. From the first aspect, before going to attack Cao Cao, Yuan Shao was dissuaded by his subordinate Tian Feng, thinking that there was not enough time, but Yuan Shao, who had a deep hatred for Cao Cao, could no longer bear it and had to start. He didn't listen to his men's dissuasion, so he went to war rashly, because Tian Feng said in Yuan Shao's notes that the battle would fail before time, and Yuan Shao, the agent, also killed Tian Feng to sacrifice the flag. Therefore, this is also the reason why Yuan Shao failed in the battle of Guandu, mainly due to his quick success and instant benefit, his failure to make good use of talents and his failure to reflect on himself from other people's words. On the other hand, Yuan Shao doesn't know how to evaluate the situation. When Xu You couldn't stand Yuan Shao's scolding and his fatuity and fled to Cao Cao, he told Cao Cao where Yuan Shao's grain and grass were stored, and Cao Cao sent troops to surprise the Wu Dynasty. When he learned that the Wu Dynasty was about to perish, Yuan Shao, as a man, did not choose to rescue him, but sent more troops to protect himself. This is his fear of death, but also led to the victory of Cao Cao's battle of Guandu. Another reason is that when Yuan Shao learned that the Wu Dynasty was captured by Cao Cao, he not only failed to reflect on himself from this defeat, but also sent his confidant general Zhang Jaw, who happened to be caught by a series of tricks of Cao Cao, and Zhang Jaw was ambushed by Cao Cao's army, so the battle of Guandu ended in Yuan Shao's failure. A general should have an eye for sizing up the situation and reflect on himself from the words of his advisers. Only in this way can he make his army strong and not be angered by other people's tricks.