Tic Tac Toe, also called wick wack woe (in some Asian countries) and noughts and crosses (in the British Commonwealth countries) and X's and O's in the Republic of Ireland, is a pencil-and-paper game for two players, X and O, who take turns marking the spaces in a 3×3 grid. The X player is your phone. The player who succeeds in placing three respective marks in a horizontal, vertical, or diagonal row wins the game.
A player can play perfect Tic Tac Toe (win or draw) given they move according to the highest possible move from the following table.
Win: If the player has two in a row, play the third to get three in a row.
Block: If the [opponent] has two in a row, play the third to block them.
Fork: Create an opportunity where you can win in two ways.
Block opponent's Fork:
Option 1: Create two in a row to force the opponent into defending, as long as it doesn't result in them creating a fork or winning. For example, if "X" has a corner, "O" has the center, and "X" has the opposite corner as well, "O" must not play a corner in order to win. (Playing a corner in this scenario creates a fork for "X" to win.)
Option 2: If there is a configuration where the opponent can fork, block that fork.
Center: Play the center.
Opposite corner: If the opponent is in the corner, play the opposite corner.
Empty corner: Play in a corner square.
Empty side: Play in a middle square on any of the 4 sides.
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