Why was Guiguzi defeated by Sun Wu?

Thanks to luck and my understanding of his teacher, Guiguzi. Guiguzi was defeated by Sun Wu by luck and his own understanding of the teacher Guiguzi. Guiguzi is Sun Wu's teacher. Because of his war status, he had to be hostile to Sun Wu. Most of his actual combat experience in the Art of War was taught by Guiguzi on the edge of the battlefield, which is called watching the war. Moreover, Sun Wu's victory over Guiguzi depends on luck and his own understanding of the teacher Guiguzi. Guiguzi, Wang, whose real name is Xu, alias Zen, whose date of birth and death is unknown, also known as Wang Xu, Wang Li, whose real name is Guiguzi. Sun Wu (545-470 BC) was born in Le 'an, Qi at the end of the Spring and Autumn Period. China, a famous strategist and politician in the Spring and Autumn Period, was honored as a soldier sage or grandson (Sun Wuzi), also known as "the most holy strategist", and was known as "the teacher of a hundred schools of thought" and "the originator of eastern military science".