Each player in turn places one man on any unoccupied intersection, from which it never moves. Any point or space surrounded by men of one color belongs to that player. When players agree that ownership of all points on the board has been established, each one's score is the total of his enclosed points less the number of his men lost by capture.
Two men are "connected" if they are adjacent on the same vertical or horizontal line. (The white men are connected and the blacks are not in group I in the grid shown here.) Men "live" as long as they are connected to at least one vacant intersection; they "die" if they are completely enclosed. (White men are dead in II, III, IV, and V.) If a player disputes ownership, he must invade the adversary's space and establish a live group in the area. Captured players are removed from the board at once; doomed forces are removed at the end of play. Vacant points connected to both colors belong to neither side.
In group VI, the whites are doomed; black wins men and space by playing H 14 and killing the white forces. Whites in VII are forever safe because black loses a man by playing G 7 or H 6, and neither play kills the white men. An eye is a point surrounded by 4 men of the same color. A force with two separate eyes is safe. In VIII, black saves his men and space with N 7; if it is white's move he can win the group starting with N 7. Because of the many possible series of moves, Go is a most complicated board game.
