Why did Li, the eldest son of Datang, lose in Xuanwu Gate?

In the change of Xuanwu Gate, Li gained an advantage in strength, but he was defeated because he was too confident. At that time, he was his eldest son, and Li also named him Crown Prince. Later, he was supposed to inherit the throne, but Xuanwumen lost in World War I, but in the end Li Shimin became emperor. It turns out that he is two brothers. For the sake of the throne, there is always World War I. I can only say that luck is more beneficial to Li Shimin.

It is said that Li Shimin's "gambling on luck" seems to be "putting his life on the line", even his life. Finally, Li lost and was forced to give way. In fact, both of them are very good. No matter who is in power in the end, you can make some achievements. First of all, Li didn't do anything at first, but he was obedient, all the power was in his hand, and he was still a prince.

Li Shiming was not successful at that time, but he was very resourceful in military strategy. However, Tang Gaozu still favors the crown prince's succession. Li is full of confidence in the Xuanwu gate battle. After all, the military power that the prince can master will be different, so his army is much stronger than Li Shimin's, and many ministers and military generals including the DPRK support the prince, which is why the prince is too confident to take this matter seriously.

Finally, Li was not alert, and someone had reminded him long ago, but he went alone and felt that he was determined to win. It can also be said that Li Shimin fought a "self-defense war" just because he wanted to protect himself and had to fight back. Prince Li Shimin may still have a "confidant" around him. In short, he made a "larger foe" with fewer enemies, which made Li unexpectedly appear. After the defeat, the position of the prince appeared.