Orion is a two player game in which the players first alternately place their spaceships on the intersections and when all ships have been placed, they move them along the grid lines. One ship is moved at a time by a player. A spaceship can move from one end of an intersection to the next one, with the exception of the main spaceship (white for one player and black for the other) that can move two spaces. Spaceships cannot jump over each other. If a spaceship is surrounded by others (enemy or own) in a way that it cannot move (no more free spaces next to it), then it is taken off the board. If more than one spaceship gets surrounded, all of them are taken off simultaneously. If the main spaceship is taken off, or there are only 2 spaceships left from the fleet, the player looses.

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