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2. Tic-tac-toe - Wikipedia

   en.wikipedia.org/wiki/Tic-tac-toe

   Tic-tac-toe (American English), noughts and crosses (Commonwealth English), or Xs and Os (Canadian or Irish English) is a paper-and-pencil game for two players who take turns marking the spaces in a three-by-three grid with X or O. The player who succeeds in placing three of their marks in a horizontal, vertical, or diagonal row first is the ...

3. How to Win Tic-Tac-Toe: The Strategies You Need to Master - AOL

   www.aol.com/win-tic-tac-toe-strategies-190027489...

   Tic tac toe is a classic game. How to win tic tac toe requires strategic thinking and planning to win the game or force a draw. When you’re the first one up, there is a simple strategy on how to ...

4. Tic-tac-toe variants - Wikipedia

   en.wikipedia.org/wiki/Tic-tac-toe_variants

   Tic-tac-toe is an instance of an m,n,k-game, where two players alternate taking turns on an m×n board until one of them gets k in a row. [1] Harary's generalized tic-tac-toe is an even broader generalization.

5. Harary's generalized tic-tac-toe - Wikipedia

   en.wikipedia.org/wiki/Harary's_generalized_tic...

   Harary's generalized tic-tac-toe or animal tic-tac-toe is a generalization of the game tic-tac-toe, defining the game as a race to complete a particular polyomino on a square grid of varying size, rather than being limited to "in a row" constructions.

6. Notakto - Wikipedia

   en.wikipedia.org/wiki/Notakto

   Notakto is a tic-tac-toe variant, also known as neutral or impartial tic-tac-toe. [1] [2] The game is a combination of the games tic-tac-toe and Nim, [1] [3] played across one or several boards with both of the players playing the same piece (an "X" or cross).

7. Order and Chaos - Wikipedia

   en.wikipedia.org/wiki/Order_and_Chaos

   Order and Chaos is a variant of the game tic-tac-toe on a 6×6 gameboard. It was invented by Stephen Sniderman and introduced by him in Games magazine in 1981. [1] The player Order strives to create a five-in-a-row of either Xs or Os. The opponent Chaos endeavors to prevent this.

8. Game tree - Wikipedia

   en.wikipedia.org/wiki/Game_tree

   The first two plies of the game tree for tic-tac-toe. The diagram shows the first two levels, or plies, in the game tree for tic-tac-toe. The rotations and reflections of positions are equivalent, so the first player has three choices of move: in the center, at the edge, or in the corner.

9. Strategy-stealing argument - Wikipedia

   en.wikipedia.org/wiki/Strategy-stealing_argument

   A strategy-stealing argument can be used on the example of the game of tic-tac-toe, for a board and winning rows of any size. [2] [3] Suppose that the second player (P2) is using a strategy S which guarantees a win. The first player (P1) places an X in an arbitrary position. P2 responds by placing an O according to S.