Rules of Go - introductory

PageType: HomePage   Difficulty: Introductory   Keywords: Rules

This page introduces the basics of Go rules. These rules allow you to quickly move to playing your first game.

Table of contents


1. Players

[Diagram]
Black and White  

The game is played by two players. We call them Black and White.


2. Board

The board is a grid of horizontal and vertical lines, as shown below.

[Diagram]
The standard 19x19 board  

The standard size of the Go board is 19x19.

But 9x9 or 13x13 boards are also preferred, usually by beginners or people who wants to play Go very simple.

[Diagram]
A 5x5 board  

On this page, the 5x5 board is used to give examples, which is small compared to the sizes Go players normally use. However, the size of the board does not affect the rules.


3. Point

The lines of the board have intersections wherever they cross or touch each other. Each intersection is called a point. That includes the four corners, and the edges of the board.

[Diagram]
Two points  

The example board has 25 points. The red circle indicates a particular point. The red square in the corner is also a point.

[Diagram]
Adjacency  

Two points connected by a line segment are said to be adjacent or next to one another.

White in this diagram is an example of adjacency.

The cross that Black made is not adjacent by definition.


Go is played on the points of the board, not on the squares.


4. Stones

Black uses black stones (B). White uses white stones (W).

[Diagram]
Some stones  

The example shows a board position in the middle of the game with 4 black stones and 3 white stones.

The points on which any stone is put are called occupied. All the other points are called unoccupied or empty.


You don't need to exclusively use stones to play Go. You can use as stones whatever you've got: Poker chips, beads, buttons, coins, and so on.

Even further, you only have to draw a certain grid (somewhere like paper) and then mark O's and X'es on the intersections to play Go.


5. Play

Players take alternate turns.

The player having the turn puts one of his own stones on an empty point.

[Diagram]
Before the play  
[Diagram]
A white play  

White plays a white stone at the point W1.

[Diagram]
After the play  


Sometimes, to complete a play, a player removes stones from the board.

Sometimes there are points that may not be played on a particular turn.

A player may also pass instead of playing a stone on their turn.


Unless a player passes, he puts one of his stones on the board on each of his turns.

Remember, once putting on the board, the players must not drag stones to somewhere else.


6. Game Start

The game starts with all board points empty, and Black plays first.

[Diagram]
Empty board  
[Diagram]
Black starts  

In the example Black chooses to start at the point B1.


As an exception, if one player has more experience, the other player holds Black and can have with several stones on the board from the start.

These additional stones are called a handicap. This makes Go more enjoyable for the players with some gap of ability.


7. Capture

The Capture Rule: If a player surrounds the opponent's stone or stones completely, he captures those stones and removes them from the board.

Every stone on the board must be next to an empty point. This empty point is called a liberty.

If a stone is not next to an empty point, but it's connected to some other stones of the same player which are next to an empty point, that's fine too.

In that case, the (adjacent) stones in a string share liberties, and the string of stones is said to have liberties (or simply the stones have liberties).

If there are no empty points next to a stone or a string of stones (i.e. no liberties), the stones are immediately taken off the board.


Now four examples follow:

  • The first example shows Black capturing a single White stone.
  • The second shows Black capturing a clump of three White stones.
  • The third shows Black capturing a clump of four White stones and another lone White stone with the same move.
  • The fourth shows White capturing two Black stones.


Example 1

[Diagram]
Before the play  

The white stone is almost surrounded. It is next to only one empty point, shown by the square.

Remember, only points adjacent by a line segment are next to one another. So the circles do not count as liberties.

[Diagram]
Black captures  

Black's move B1 surrounds the white stone completely.

[Diagram]
After the play  

Black's move B1 occupies the last liberty of the white stone, thus capturing it and removing it from the board.


Example 2

[Diagram]
Before the play  
[Diagram]
Black captures three stones  

The three white stones white+circle are connected along the lines of the board, and stand or fall together.

Black's move B1 occupies their last liberty and captures them, removing them from the board to leave the third position.

[Diagram]
After the play  


Example 3

[Diagram]
Before the play  
[Diagram]
Black captures 5 stones  
[Diagram]
After the play  

A play can also surround different stones at the same time even if not all of them are connected along lines. Black's move B1 captures the surrounded five white stones. For this Black occupies the last liberty of the four white stones at the top which is also the last liberty of the one white stone in the middle. All the white stones without liberties are captured and thus are removed.


Example 4

[Diagram]
Before the play  
[Diagram]
White captures  
[Diagram]
After the play  

The White play W1 occupies the last liberty of the two black stones, and removes them.


It does not matter that temporarily a white stone does not have a liberty; after execution of White's play, all stones on the board have at least one liberty again, leaving a legal position.


8. No Repetition

The Repetition Rule: One may not play a move which repeats a previous board position.

This rule prevents players from endlessly capturing and recapturing one stone, back and forth.

[Diagram]
A position  
[Diagram]
A legal move  
[Diagram]
Illegal move  

White's move W1 removes a stone and Black's move B2 would remove the stone W1. However, B2 would also repeat an earlier position - the position just before move W1.


Since repetition of the board position is prohibited by this rule, Black cannot play at the point 2 now in the example. Currently Black must play on a different point.

Note that on subsequent turns, the same play may be available as a legal move, because it will not be repeating the same board position.

For more on this rule, see ko.


The situation where repeating captures of the same stones would be possible without a special rule is called a ko; ko fights can be one of the most exciting parts of the game.


9. End of the Game

The Victory Rule: The player who controls (occupies or surrounds) more points than his opponent wins the game.

When neither player wants to keep putting stones on the board, they will each pass. (Remember, passing is always a legal move... although until the end of the game, it's not a very good move!) The player who controls more of the board wins.

There are two ways to score, Chinese and Japanese; Japanese scoring is more common in Western countries. Both systems count territory, the number of empty points surrounded by one player's stones, but they differ in how the stones are counted. In either case, each player gets a total score and whoever has the larger score wins the game. For the vast majority of positions, the two systems give the same difference of scores, and for nearly all they give the same winner.

  • In Chinese scoring, the score is territory plus the number stones the player has left on the board.
  • In Japanese scoring, the score is territory minus the number of stones the opponent has captured.

Our example uses Chinese scoring.

[Diagram]
Final position  
[Diagram]
Black's points  

13 points score for Black: 7 points occupied by black stones and 6 points surrounded by only black stones.

[Diagram]
White's points  

12 points score for White: 7 points occupied by white stones and 5 points surrounded by only white stones.


In the example, Black controls more points and therefore Black wins the game.

[Diagram]
Final position  

That's it! Now you can play Go.


10. What's next?

This page is a first, basic introduction to the game. As an introduction, it does not seek to overwhelm the reader with a bestiary of strange cases which are decided differently depending on the exact wording of the rules. If precise readers spot inconsistencies in these rules; or if eager beginners encounter a situation in their games which they found ambiguous; then they may wish to consult

The second tutorial aims to deal with frequently asked questions, introduce the finer points of making a consistent rule set, and explain why different Go associations sometimes have different rules. However, it still assumes that the reader does not yet have a good intuitive feel for the game. To jump straight into the thick of things, see

A more subtle understanding of the rules of Go will not help you play Go better. There are several minor variations to the rules of Go worldwide, but it is quite rare for these variations to affect play. Most of the confusions that a beginner faces are not about how to play, but about how to play well.

These pages should help with the first questions arising from practical play. For other pages aimed at beginners, see

[Diagram]
corner  

Rules of Go - introductory last edited by 143.248.216.101 on October 22, 2017 - 07:56
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