1997-5-2 last update, 1997-4-17 first day
Robert Jasiek, firstname.lastname@example.org
These rules logically improve the WWGo 1996 Rules [link] of Sakai Takeshi which are a severe improvement of the still enforced Nihon Kiin 1989 Rules [link]. Major changes occur.
These rules must be applied in a spirit of good sense and mutual trust between the players.
The board is a grid of horizontal and vertical lines. The maximum number of horizontal and vertical lines is 19, forming 361 intersections. Plays are made on unoccupied intersections, referred to as empty points. The point on which a play is made is called a point of play.
One player plays the black stones; the other player plays the white stones. The two players have the right to play one stone at a time, in alternation. This is referred to as the right to play. The right to play ends when two consecutive passes are made.
Stones belonging to one player that are joined along adjacent intersections on the board are treated as a single connected unit, as if they were a single stone. The word "stones" as used below refers to one or more of these connected units of stones.
Stones remain on their points of play on the board as long as they have a horizontally or vertically adjacent empty point, called a liberty. No stones can remain on the board without a liberty.
If due to a player's move any of the opponent's stones can no longer remain on the board, those opponent's stones are removed from the board. Stones removed in this way are called prisoners. In this case, the move is completed when the stones have been removed.
A player cannot play on an empty point if any of the player's own stones would be unable to remain on the board at the completion of the move. Such a point is called a non-playable point.
A shape in which the players can alternately capture and recapture one opposing stone on the same point is called a ko. The stones that are alternately captured are called ko stones. A player whose ko stone is captured cannot recapture on the same point at his next right to play.
The game stops when the right to play ends.
The game ends when agreement is reached in the game-ending procedure or when the game ends in completion. This is called the end of the game.
Each point of territory and each prisoner is worth one point. After the end of the game the prisoners held by each player are subtracted from the opponent's territory, then the points of territory are counted and compared. If both players have the same amount, the game is a draw, else the player with the higher number of points wins with the difference as winning margin.
During a game a player can end the game by admitting defeat. This is called resigning. The opponent is said to win by resignation.
If the same whole-board position is repeated during the game, a player who intends to keep repeating the same position endlessly must offer to terminate the game with no result. If the opponent refuses this offer, recreation of that same whole-board position is prohibited.
If agreement is not reached in the game-ending procedure and neither player requests play-out-to-completion, both players lose.
Moves that violate these rules cannot be made. The game is not lost by forfeit through such moves.