Ramsey(3,3) = 6

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The game of Sim, invented by Gustavus Simmons, matches Red against Blue on a hexagonal field of six dots. The players take turns drawing a line of their respective color between pairs of unconnected dots, losing if they make a triangle of their own color first.
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Contributed by: Ed Pegg Jr (March 2011)
Open content licensed under CC BY-NC-SA
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"Ramsey(3,3) = 6"
http://demonstrations.wolfram.com/Ramsey336/
Wolfram Demonstrations Project
Published: March 7 2011