Each player alternately connects two dots (cities) of his color and tries to block the way of the opponent. The task for each player is to get from one side to the other, only forming a connected line at the end. It does not have to be drawn contiguously. Red moves from top to bottom, black from left to right or vice versa. The opponent's lines may not be crossed. The first to establish a continuous line between the two sides is the winner. Lines are always drawn horizontally or vertically, but never diagonally. The small dot boxes are for practice. The game was published in the magazine "Fr si" Nr. 7/78. —user summary

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