But the most exquisite beard running card is Changde Hanshou's. According to legend, running beard was first used as an enlightenment teaching aid for people to learn arithmetic knowledge and an auxiliary tool for military training. It was invented by Yang Mo, the leader of peasant uprising in Dongting Lake area of Southern Song Dynasty. Yang Yao is from Hunan. It is said that this person prefers arithmetic, likes games, is both intelligent and brave, and is called the prince; Dissatisfied with the corruption of the imperial court, they rallied to revolt, organized poor fishermen to train naval officers in Dongting Lake area, and competed with the Song Dynasty to dominate one side. Dongting Lake has a vast water surface and numerous ports. Fishermen mostly take water as their home. They have been wandering on the water for many years, knowing the water and water conditions, and gathering and dispersing freely. The assembly is magnificent, thousands of ships are assembled, and the artillery fire is sky-high; If you are dispersed, you will fight small battles and fight alone. Yang Yao made full use of the geographical conditions and fishermen's living habits in Dongting Lake area. During military training, he organized fishermen to have two boats and one pair, and Minlang elegantly cut one boat, four boats and one gun. And create corresponding signs, while teaching literacy and arithmetic, while assisting military training, just like a sand table drilled on land. Fishermen will eat, touch, hide or run away during the game. I not only learned to read and write, but also strengthened military training. March and fight, fish for a living, take your positions and be orderly. At that time, the signboard was carved on sawdust, commonly known as "wooden skull". Because it is not easy to be eroded by water and will not sink when it falls into the water, it is suitable for use on ships. Later, it became popular on the shore, and it was changed to a card when it entered the government. And because people who were keen on this game at that time and then soaked in the lake all day, people nicknamed it "soaking in the lake", hence the name disk. It was renamed as "running and" or "running beard" after it developed to land.