A string of stones is captured by playing into string's last liberty. In the diagram white stones (A) are captured when black plays into B. A stone string consists all the stones connected by lines. A string does not connect diagonally.
An example game continuation is shown. White 1 cannot capture the black stone. Black 2 could connect black stone, but here it does not do it. White 3 may capture black stone, as stones 1 and 2 changed the whole-board position.
One of the players takes black "stones" and the other player takes white "stones". The board is a grid of 9 by 9 lines. The game starts with 4 stones are on the board as shown in the diagram. Black player starts the game. Each player plays a single stone of their own color. A player can play to any empty intersection. A player may not pass. Once the stone is played it is never moved to another intersection.
White may not capture black immediately after black capture, as this would produce the same whole board position as before black move. So white must play somewhere else. After this white may capture from A.
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