rule

The game is played on a grid of 19x19 points. The color of a point is black, white, or empty. One player uses black, another white. The start is on the empty grid by black. A black / white point is surrounded if no leaving path reaches empty first after black / white; an empty point is surrounded by black / white if any leaving path reaches black / white first after empty. A move of a player colors an empty point his color, then empties all surrounded points of the opponent's color, then empties all surrounded points of the own color. A pass does not color. The end is two successive passes.
How to play

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