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Weiqi

Weiqi is Chinese strategic board game for two players. It is known as Igo or Go in Japanese, and Wei Chi in China or Baduk in Korea. Game of Go originated in ancient China, centuries before its earliest known references in 5th century BC writing. It is very popular in East Asia, yet recently it gained popularity in the rest of the world. Go is noted for being rich in strategic complexity despite its simple rules. Game of go is the only board game where computer is still unable to beat a human.
The Board of Go has a standard grid size, which is 19 × 19, although the rules of Go can be freely applied to sizes: 13 × 13 and 9 × 9. The choice for smaller sizes is also popular for it simpler and more tactic-oriented games as well as a way to introduce Go to new players.

Rank Type Range Skill Level
Double-digit kyu 30–20k Beginner
Double-digit kyu 19–10k Casual player
Single-digit kyu 9–1k Intermediate amateur
Amateur dan 1–7d (where 8d is special title) Advanced amateur
Professional dan 1–9p (where 10p is special title) Professional player

Other important aspects of GO.
Basic rules
Scoring rules
Go Equipment
Playing technique
Time control
Ranks and ratings
Tournament and match rules
Top players
Tactics
Ko fighting
Computers and Go

Having developed in China between 3,000 and 4,000 years ago, Go (called Wei Ch'i in China and Baduk in Korea) contends with backgammon for the right to be called the oldest game still played in its original form. Today it is played by millions in Asia and thousands elsewhere.