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This game is played on an empty 9x9 square board with 81 stones of just one color.

Turns - At each turn, each player drop a stone at an empty cell.

* For every 3 stones in any line (orthogonal or diagonal) the player gets 1 point;
* For every 6 stones in any line (orthogonal or diagonal) the player gets 2 points;
* For every 9 stones in any line (orthogonal or diagonal) the player gets 3 points;

When the board is full, the game ends. The player with the higher score wins.