Go is an ancient Chinese game also known as Wei Chi and Baduk.
It is a two player board gamed that is played on a wooden board with white and black stones.
The board has 19 lines perpendicular to another 19 line; this results in 361 intersections.
Players take turns placing the stones on the intersections.
The player who surrounds the most intersections (aka territory) is the winner.
To learn more see the website of the American Go Association at: http://usgo.org/gocamp/index.html
Beginners often learn on a smaller board.
In the 9x9 game below
White has surrounded 3*4 + 4*3 = 12 +12 = 24 points.
Black has surrounded 5*5 + 3*3 = 25 points.