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Chinese game Go.

The colon after go emulates the stones.

Go is an adversarial game with the objective of surrounding a larger total area of the board with one's stones than the opponent.[17] As the game progresses, the players position stones on the board to map out formations and potential territories. Contests between opposing formations are often extremely complex and may result in the expansion, reduction, or wholesale capture and loss of formation stones.

The four liberties (adjacent empty points) of a single black stone (A), as White reduces those liberties by one (B, C, and D). When Black has only one liberty left (D), that stone is "in atari".[18] White may capture that stone (remove from board) with a play on its last liberty (at D-1).

A basic principle of Go is that a group of stones must have at least one "liberty" to remain on the board. A "liberty" is an open "point" (intersection) bordering the group. An enclosed liberty (or liberties) is called an "eye", and a group of stones with two or more eyes is said to be unconditionally "alive".[19] Such groups cannot be captured, even if surrounded.[20]