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SIM on a Desktop Calculator

G. J. Simmons [4] introduced the game of SIM which he describes as being “played by two persons on the six vertices of a regular hexagon using two colored pencils. Each player in turn fills in one of the 15 possible lines connecting a pair of the points. The player who is first to form a complete triangle (only those with vertices on the six starting points are considered) of his color, loses. The object of the game then is not to form such a triangle yourself and to force your opponent to do so.”