1. INTRODUCTION
Renju is played between two opponents on a board by making moves with black and white men called stones.

2. THE BOARD
The board has 15 vertical and 15 horizontal lines with 225 intersections. Five of these intersections are reference points.

3. TERMS AND DEFINITIONS

Row
A combination of stones in the same colour, either situated on a diagonal, vertical, or horizontal line, which is limited by the edge of the board, the opponent stone or a free intersection, and where no opponent stones are situated among the own stones.

Unbroken row
A row where between just any stones there is no free intersection.

Five in a row
An unbroken row with five stones.

Overline－－－长连
An unbroken row consisting of six or more stones.

Four
A row with four stones to which you can add one more stone to attain five in a row.

Straight four
An unbroken row four stones ("four") to which you, in two different ways, can add one more stone to attain five in a row.

Three
A row with three stones to which you, without at the same time a five in a row is made, can add one more stone to attain a straight four.

Double-four
Putting a stone on an intersection, which at the same time makes more then one four that meet each other in this intersection.

Double-three
Putting a stone on an intersection, which at the same time makes more then one three that meet each other in this intersection.

4. THE WAY TO PLAY

4.1

One of the players has at his disposal the black stones and the other player has white stones.
4.2

Both the players must alternately make one move each time. Black (the player with the black stones) begins the game by making a move in the middle of the board.
4.3

Black to play means that it is black磗 turn to move. White to play means that it is white磗 turn to move.

5. THE CONCEPTION MOVE
A move consists of either the putting of a stone on one of the intersections of the board or of the declaration by the player to play that he gives up his right to put a stone on the board (he passses).

6. WIN OF A GAME
6.1

The winner of the game is the player who will be first to attain five in a row. For white is also overline counted as a win.
6.2

The game is won for white if black without at the same time attaining five in a row:
a) makes an overline;
b) makes a double-four;
c) makes a double-three (however there are some double-threes, which black are allowed to make, see 6.3);
6.3

A black double-three is allowed if the conditions in both the following points a) and b) are fulfilled:

a) Not more then one of the three can be made to a straight four when adding another stone in just any intersection, without at the same time an overline or double-four is attained in this intersection. To find out which double-three, which are allowed, you must make the move, which causes the double-three, in your mind, and then continue trying to make straight fours, which are allowed, in your mind.
b) Not more then one of the three can be made to a straight four when adding another stone in just any intersection, without at the same time at least two three meet in this intersection and make a forbidden double-three. To find out if this last double-three is forbidden or not, you must at first examine if the double-three is allowed according to a) above, and then in your mind continue trying to make straight fours of the three in your mind. If, when making a straight four in your mind, another double-three would be attained also these double-three must be examined in the same way as it is described in this point 6.3, etc.

7. DRAW
a) The game is draw
7.1

when all the intersection of the board are occupied;
7.2

when both the players (after each other) pass (refrain from making their moves);

8. THE PATTERNS OF RENJU
Only 13 indirect and 13 direct patterns are possible to play.( It means that the second move and the third move must be played in a defined area. Two alternatives are possible for the second move and after the second move 13 alternatives are possible for the third move.)

 

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