The TAIJI (meaning "Great Duality" in Chinese) is a two-player abstract board game invented by Néstor Romeral Andrés in 2007.


The TAIJI is played on a 9x9 board using special pieces called TAIJITUs.  Both players use exactly the same TAIJITUs.





The goal of the game is to get the highest score summing up the two largest groups of horizontally or vertically (but not diagonally) connected squares of your colour (Light or Dark) by placing TAIJITUs anywhere on the board, as long as there is a free space to do so. If a game ends with equal scores then the second player (Dark) wins.

Below is an example of a finished game:

The two largest light groups contain 19 squares (12 + 7).
The two largest dark groups contain 16 squares (10+6)
The Light player wins.


The game begins with an empty board.

Starting with the Light player, players take turns placing one TAIJITU per turn on two unoccupied adjacent cells of the board.

The game ends when no TAIJITU can be placed on the board.

There is a variant of TAIJI game called TAIJI Deluxe. This variant is played on 11x11 board, and the winning condition includes the sum of the three largest groups instead of just two.

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