Go

From Wikipedia’s entry on Go:

Go is a board game for two players. It is also called Weiqi in Chinese (圍棋,围棋), Igo in Japanese (Kanji: 囲碁), and Baduk in Korean (Hangul:바둑). Go originated in ancient China before 2000 BC, and is now popular throughout the world, especially in East Asia.

Go is played by alternately placing black and white stones on the vacant intersections of a 19×19 rectilinear grid. A stone or a group of stones is captured and removed if it is tightly surrounded by stones of the opposing color. The objective is to control a larger territory than the opponent by placing one’s stones so they cannot be captured. The game ends and the score is counted when both players consecutively pass on a turn, indicating that neither side can increase its territory or reduce its opponent’s; the game can also end by resignation.