A game with two independent players 1 & 2, leveraging interprocess communication (IPC).
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When a player starts, it incepts a random (whole) number and sends it to the second player as an approach of starting the game.
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The receiving player can now always choose between adding one of {-1,0,1} to get to a number that is divisible by 3.
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Divide it by three. The resulting whole number is thensent back to the original sender.