ZOP

Contact capture. Here are the basic types of capture.

CC 1A

In this simple method of capture, each stone that comes into contact is taken. In the diagram, the player captures the opponent’s stones (A) and (B) using (1), and captures (B) and (C) using (2).

CC 1B

In this method of capture, each stone that comes into contact with an opponent’s stone and is not in contact with another opponent’s stone is taken.
In the diagram, using (1), stone (A) cannot be captured because it is still in contact with stone (B), and stone (B) cannot be captured because it is in contact with (A). Using stone (2), stone (B) cannot be captured because it is in contact with stone (C).
If it were the other player’s turn, stone (B) could not capture either stone (1) or (2). Stone (A) can capture stone (1) because it is not in contact with any other stone. Stone (C) can capture stone (2).

CC 2A

To remove a stone, there must be two stones that are in contact with the stone being removed.
In the simple way, stone (B) removes stones (1) and (2). Stone (C) removes stones (2) and (3), while stone (C) also removes stones (3) and (4).

CC 2B

To remove a stone, there must be two stones that are in contact with the stone being removed.
In this way, a stone that is threatened by two opponent's stones cannot be removed.
Stone (1) is threatened by stones (A) and (B). Stone (2) cannot be removed because it is threatened by stones (B) and (C). Only stones (3) and (4) can be removed, and that is stone (C).

CC 2C

To remove a stone, there must be two stones that are in contact with the stone being removed.
In this way, only common stones that are not in contact with each other can be removed.
Stone (C) can remove stones (2) and (4), and stone (C) can also remove stones (3) and (4). Stone (B) cannot remove stones (1) and (2) because they are in contact with each other.

CC 3A

To remove a stone, there must be three stones that are in contact with the stone being removed.
In this way, stones (2), (3), and (4) will remove stone (C).

CC 3B

To remove a stone, there must be three stones that are in contact with the stone being removed.
In this way, no stone may be in danger of removal. Stone (2) could be removed by stones (B), (C), and (D). Therefore, in this picture, no stone can be removed. If stone (D) were a blue stone, then it would be possible to remove stone (C).

CC 4A

To remove a stone, there must be four stones that are in contact with the stone being removed.
In this way, stones (1), (2), (5), and (6) can remove the opponent's stone (B).