Tic-tac-toe

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Tic-tac-toe is a popular pen and paper game. The game utilizes a 3x3 grid using the letters X and O to fill them. If a player gets three in a row (vertically, horizontally, diagonally) of his or her own letter, that player is the winner. Games of tic-tac-toe generally end up in a draw.

Tic-tac-toe is simple enough that every possible series of moves can be enumerated.

• Wikipedia's article on Tic-Tac-Toe
• Enumeration of every possible tie
• Enumeration of every two- or three-move opening

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