Any stones that get caught between two stones of the opposite color by a newly placed stone are flipped, i.e., they change color. You may only place a piece if doing so will flip at least one other piece. Otherwise you have to miss a turn. The game ends when either the board is full or neither player can make a move. The winner is the player who has the most stones on the board at the end of the game.
Draws are possible.
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