Martial arts have been an integral part of Japanese culture for centuries. One of the most significant aspects in their development is the introduction of the dan ranking system. The term “dan” 段, which literally means “stage”, was first used by Sansa Honinbo 本因坊 算砂, the founder of the Honinbo Go school in the late 16th century. Go 囲碁 is a traditional strategy board game originated from China and introduced to Japan around the 7th century. The game is played by two players who take turns placing black and white stones on a square grid board. The objective is to gain more territory on the board than your opponent by…