1998-12-01 last update, 1997-01-16 first day, Robert
IGS ( telnet
igs.joyjoy.net 6969) has two rule sets: these rules and GOE rules.
Both have been implemented by Tim Casey. GOE rules are based on the Ing
1991 rules. The IGS rules are designed to provide players from the whole
world with a simple set resembling Japanese rules. Special rulings are
omitted in favour of void games. The rules use basic ko,
forbidden suicide, byoyomi,
and Japanese handicap. Confirmation of life
and death at the game end is left to the players' agreement.
Territory is monochrome surrounded empty board
points plus removed opponent's stones. Special
features are added.
Rules of Play
- The two players of a go game play black respectively white stones on
a grid board.
- Before the start of a game the players agree on accepting this rules,
the match command, the colour choice, the size of the board, and the time
- Before the start of a game the players should agree on the rating status,
the handicap, the komi, handling of exceptional cases, and additional features.
- Black makes either the first move or sets the handicap on an empty
board. This is followed by alternating moves of both players until the
- A move is either a board play or a pass.
- A board play consists of placing a stone on an empty grid point and
then removing all units of opponent's stones that are connected by grid
lines and not adjacent to an empty grid point.
- A board play is prohibited if it leaves a unit
of own stones that are connected by grid lines and not adjacent to an empty
- If a single stone removes a single stone, then no
single stone may remove it immediately.
- Three consecutive passes stop alternating play for confirmation of
life and death of stones on the board.
- All stones that could be removed by continued alternating play should
be removed by agreement of both players. (clicking on stones or entering
- Removal is ended by agreement (done); before a score check is available.
- If the players cannot agree, then play may be adjourned or resumed
(undo) until a void game occurs due to the maximal number of moves of a
- Before the game stop a game is ended by forfeit due to run out of time.
- Before a done confirmation a game is ended by resignation of a player.
- After a confirmation both players have territory
of their colour. Territory includes connected units of empty grid points
that are not adjacent to an opponent's stone, with each grid point being
worth one point, and removed opponent's stones, with each stone being worth
one point. The komi is added to the white territory. The player with more
territory wins the game.
Rules of Special Features
- When creating a game IGS proposes komi.
- Both players may agree upon another value and should set it before
the second move.
- Successive moves of one player, moves on occupied board points or off
the board, and violations of move rules are announced but otherwise ignored.
- Before the game stop undoing a move is a right.
- Disagreement of confirmation requires undo.
- Interruption can be caused by mutual agreement (adjourn), hardware
or software problems.
- Interrupted games are to be resumed (load) as soon as possible. Otherwise
a lost player has to inform his opponent. It is possible to resign a stored
- Intentional escaping combined with refraining resumption is considered
unethical by the IGS community.
- If a resumed game is not completely saved, prior play must be repeated.
- Each player starts with the same amount of time.
- The available time consists of basic time and byoyomi.
- Byoyomi requires play of a fixed number of stones within a fixed period
- The use of addtime is a right. It is polite to add time in case of
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