I know two things. One is TuiBei Diagram, which is really written in TuiBei Diagram. The other is that Li Shimin wants to test their mental arithmetic ability and let them find out which horse crosses the river first (touch the river first).

0 1, the birth of pushback graph

I learned that there were two magicians named Li and Yuan Tiangang in the Tang Dynasty, so I asked someone to ask them to count the national fortune for the Tang Dynasty. In the seventeenth year of Li Shimin in the Tang Dynasty, Li began to calculate the historical trend of the Tang Dynasty with the Eight Diagrams of Zhouyi. This calculation is like drinking good wine, and it will be addictive for a while. Yuan Tiangang looked at Li Fengchun sweating like a pig, patted him on the back and said: Let's stop here. It's time to have a rest. ?

Li did not continue to calculate divination, and the content of this divination is the later "TuiBei Map". It is said that this book is one of the rare historical books, which clearly records the historical trend of China after 2000 and is very accurate.

02. Stop the horse from crossing the river

Li Shimin, Emperor Taizong, saw that the weather was fine and the national strength of the Tang Dynasty was growing stronger, so he took Yuan Tiangang and Li out for a walk. Walking slowly, I don't know how far I have gone. I see a river not far away, and there are two good horses by the river. One horse is as hot as fire, and the other is like charcoal. Li Shimin became interested and said to them. You two are so clever. You might as well calculate for me which of the two horses will reach the river first. ?

Li and Yuan Tiangang are both expert magicians. If ordinary people ask such low-level questions, they are too lazy to pay attention, but the person who asks the questions is a brother of the Tang Dynasty. If you don't answer truthfully, you may be beheaded. So Yuan Tiangang pinched her finger and said? Divination is for fire, and a horse with fire color should touch the river first. ? Li smiled knowingly and said? Brother plough is really smart, but the fire needs wood to light, so the dark horse should get wet first. ?

The two people disagreed, and the scene was a bit embarrassing. Li Shimin is very happy, which is exactly what he wants to see. Soon, two horses approached the river, and finally the dark horse touched the water first and crossed the river first. You look a little ugly, Li explained. Without Brother Plough, I don't think a horse touched the river first. ? The three men looked at each other and laughed.