No tiles are distinguished from any others. The players agree on some starting setup consisting of some of their stones already on the board. For example:
Here is a sample game with the starting setup and goal patterns as above. The two players are naively building up their own pattern apart from each other until Dark realises Light is going to win and it is too late to change that - except to postpone it one turn. The pictures show the board position after every move. The moves are shown by transparent reduced previous versions of every tiles that has just changed.
(game over, Light wins on move 13)