9 Pin Zhi
9 Pin Zhi (Chinese: 九品制) was an ancient Chinese ranking system for the game of Go, which first appeared in the 3rd century book "Classic of Arts" by Handan Chun. He ranks 9 different Pin (levels) for Go players, from strong to weak: 夫围棋之品有九：There are 9 levels in go: 九品之外，今不复云。 This system is loosely based on the Nine-rank system (traditional Chinese: 九品中正制 or 九品官人法), used at the imperial court to rank the importance of officials.