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.
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Capture 3 stones has an additional rule: A player may not play a stone so that it creates a past board position. So repetition of full-board position is not allowed.
Implemented simple (and limited) tournament mode. This mode disables AI tools, so they cannot be used accidentally. Mode can be set in settings. Better interface for the mode will be created later.
dialog_cancel
Cancel in normal dialog, typically combined with OK