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Sim is a two-player pencil-and-paper game involving six dots connected to form a complete graph.

Players alternate turns coloring the edges between dots, each using a different color. The objective is to avoid creating a triangle where all three connecting edges are the same color.

Due to principles from Ramsey Theory, it is guaranteed that one player will eventually be forced to complete such a triangle, resulting in their loss.

For more information about this game, check out Martin Gardner’s column in Scientific American.

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