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The teacher of Sun Bin, a famous strategist in ancient China, was Guiguzi, a strategist in the Warring States Period. He is very good at cultivating students' innovative thinking in teaching, and his methods are different and unique.

It is said that one day Guiguzi gave each of Sun Bin and Pang Juan an axe and asked them to go up the mountain to cut firewood, demanding that "firewood is smokeless and more than 100 loads", which must be completed within 10 days. After receiving the task, Pang Juan went out early and came back late every day, chopping wood without thinking.

After careful consideration, Sun Bin chose some elms and put them in a cave with a big belly and a small door, and burned them into charcoal. Then he used a pole made of cypress branches to carry the charcoal burned by elms back to Guigu Cave, meaning that one hundred cypresses were more knotted than one elm. 10 days later, Guiguzi lit the dry wood from Pang Juan in the cave for the first time. Although the fire is very strong, the smoke is rolling. Then Guiguzi lit the charcoal in Sun Bin, which was vigorous and smokeless. This is exactly what Guiguzi expected. Needless to say, diligent but thoughtless Pang Juan was criticized by Guiguzi.

Another time, Guiguzi asked disciples Sun Bin and Pang Juan this question: I am standing in the house, how can you let me out? Pang Juan said, "Teacher, what's the trouble? I'll pull you out. " Guiguzi said, "Not really. I have to let myself out. "

Sun Bin thought for a long time. He said to the teacher unhurriedly, "Teacher, I can't let you go out by yourself, but I can let you walk in from outside." Guiguzi said, "Well, I'd like to see how you let me walk into the house by myself." Say that finish, he walked out of the house and came to the yard. Sun Bin saw the teacher go out of the house and said, "Teacher, didn't you go out of the house by yourself?" At this time, Guiguzi knew that he had been cheated.