43 Kyu Problems

Semeai(mutual attack)

Black's turn. Two groups surrounding each other.
Either 3 blacks or 3 whites will die.

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.

Black can win the Semeai.

Save the three black stones left alone in the corner!


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