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Go is an ancient board game for two players that is noted for being rich in strategy despite its simple rules.
Go originated in ancient China more than 2,500 years ago. Although it is not known exactly when the game was invented, by the 3rd century BC it was already a popular pastime, as indicated by a reference to the game in the Analects of Confucius. Archaeological evidence shows that the early game was played on a board with a 17×17 grid, but by the time that the game spread to Korea and Japan in about the 7th century, boards with a 19×19 grid had become standard.