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Supported Games

The games currently supported by Gorrion are Go, Pente, Othello ( Reversi ), Onyx and Unlur. Here are short descriptions of each of these games, together with links to the full rules.


Go ( Baduk, Weiqi ) is the classic game of territory. It is one of the oldest board games known. Players take turn to create areas of territory and at the same time to form secure groups of stones. Captures of unsecured groups of stones can be made. This is a professionally played game, enjoyed throughout the word. Board sizes are 19x19, 13x13, 9x9.

[ Introduction to Go ]   ( external site )


Pente is a 5-in-a-row game played on a 19x19 or 15x15 board. Captures are allowed on 2-stone custodial configurations which ensure that achieving 5-in-a-row is never an easy task. There are many variations of Pente. The following link gives the rules as followed by Gorrion.

[ Full rules for Pente ]

Othello ( Reversi )

This game is played on an 8x8 grid. Players aim to have the majority of disks in their colour at the end of the game. Disk colours are reversed as custodial entrapments are made.

Gorrion will automatically make a move if either player has only one valid move.

[ Full rules for Othello ]


This is a connection game. Like Hex both players aim to form a connection linking opposite sides of the board. It is played on a unique geometrical tessellation of triangles and squares where captures are allowed.

A recent game, created by Larry Back, it gives a new dimension to connection-oriented games and really deserves to be more widely known.

[ Full rules for Onyx ]


The game is an interesting connection game across a hexagonal board. Players aim to be the first to complete a chain of pieces that connects edges of the board. However the configurations that the players need to achieve are different. Black attempts to create a Y, a chain that connects three non-adjacent edges of the board while White attempts to create a line, a chain that connects opposite edges of the board. At the same time players need to avoid forming the connection pattern that their opponent is aiming for.

The colours are undecided at the start of the game. Initially both players play with the black pieces until one of the players decides that the pieces played are sufficient to counter the advantage that White has in aiming for the easier connection.

Invented by Jorge Gomez Arrausi, Unlur won the 2002 Unequal Forces Game Design Competition organised by the Abstract Games magazine.

[ Full rules for Unlur ]

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