Go (圍棋 weiqi in Chinese, 囲碁 igo in Japanese, 바둑 baduk in Korean, common meaning: "encircling game") is a board game for two players that originated in China more than 2,000 years ago. The game is noted for being rich in strategy despite its relatively simple rules.

The two players alternately place black and white markers, called "stones", on the vacant intersections (called "points") of a grid of 19×19 lines (beginners often play on smaller 9×9 and 13×13 boards). The object of the game is to use one's stones to surround a larger portion of the board than the opponent. Once placed on the board, stones can only be moved if they are captured (removed from board). When a game concludes, the controlled points (territory) are counted along with captured stones to determine who has more points. Games may also be won by resignation.

Go originated in ancient China. Archaeological evidence shows that the early game was played on a board with a 17×17 grid, but by the time the game had spread to Korea and Japan, in about the 5th and 7th centuries CE respectively, boards with a 19×19 grid had become standard.

A game is structured playing, usually undertaken for enjoyment and sometimes used as an educational tool. Games are distinct from work, which is usually carried out for remuneration, and from art, which is more often an expression of aesthetic or ideological elements. However, the distinction is not clear-cut, and many games are also considered to be work (such as professional players of spectator sports/games) or art (such as jigsaw puzzles or games involving an artistic layout such as Mahjong, solitaire, or some video games).

Key components of games are goals, rules, challenge, and interaction. Games generally involve mental or physical stimulation, and often both. Many games help develop practical skills, serve as a form of exercise, or otherwise perform an educational, simulational, or psychological role.

Attested as early as 2600 BC, games are a universal part of human experience and present in all cultures. The Royal Game of Ur, Senet, and Mancala are some of the oldest known games.

Wu Qingyuan (吳清源, Pinyin: Wú Qīngyuán, born June 12, 1914), generally known in the West by his Japanese name Go Seigen, is considered by many players to be the greatest player of the game of Go in the 20th century and of all time.

Born June 12, 1914 in Fuzhou, Fujian Province, southeast China, Go Seigen did not start learning the game of Go until he was nine, a relatively late age for a professional (Honinbo Dosaku first learned Go at seven and Honinbo Shusaku before he was six). His father, who had taken Go lessons from Honinbo Shuho while studying in Japan, was responsible for introducing him to the game. Go Seigen quickly excelled and soon became known as a Go prodigy. By the time he was 12, less than three years after first learning the game, he was already of professional strength, as evidenced by his games against the visiting Japanese player Iwamoto Kaoru, 6p in 1926. The next year, he was able to reach a draw in a two-game match against another Japanese professional, Inoue Kohei, 5p. In 1928, still only 14 years old, he twice defeated Hashimoto Utaro, 4p. Go Seigen's reputation spread to Japan, then the leading Go powerhouse, and a movement was started there to bring him to Japan. He subsequently immigrated to Japan in 1928, at the invitation of Baron Kihachiro Okura and Inukai Tsuyoshi (later prime minister of Japan), and embarked on a professional career. He was tutored by Segoe Kensaku, the same teacher as Hashimoto Utaro and Cho Hunhyun.