The Complete Map of Optimal Tic-tac-toe Moves

Use this handy chart from Randall Munroe of xkcd (or better yet, memorize it) to become a whiz at tic-tac-toe! The chart shown for "x" should be used when you have the first turn. The red x is your response for the various scenarios. At the site you'll find a second chart for "o" which is what you use if you have the the second turn. Link -via The Daily What

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