As above, when black and white surround each other and neither inner stone
groups has 2 eyes, both sides try to fill out the vacant spaces, or liberties,
to kill the opponent's stones inside.
This situation is called "Semeai" - mutual attack.
In the above problem, both sides have 3 liberties. However, black can kill
white one move faster because it was black's turn.
If it were white's turn, white wins the Semeai.
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