Tic Tac Toe Ultimate

與伴侶或機器人玩井字遊戲終極（或圈與叉）。

Play the Tic Tac Toe Ultimate game (also called Noughts and Crosses) for free online with mate or bot.

Actually this game gives you a chance to show your brain and problem solving ability!

Who will be faster and clever - will win!

Strategy

Optimal strategy for player X. In each grid, the shaded red X denotes the optimal move, and the location of O's next move gives the next subgrid to examine.

Note that only two sequences of moves by O (both starting with center, top-right, left-mid) lead to a draw, with the remaining sequences leading to wins from X.

Optimal strategy for player O. Player O can always force a win or draw by taking center. If it is taken by X, then O must take a corner

A player can play a perfect game of tic-tac-toe (to win or, at least, draw) if they choose the first available move from the following list, each turn, as used in Newell and Simon's 1972 tic-tac-toe program.[14]

Win: If the player has two in a row, they can place a third to get three in a row.

Block: If the opponent has two in a row, the player must play the third themselves to block the opponent.

Fork: Create an opportunity where the player has two threats to win (two non-blocked lines of 2).

Blocking an opponent's fork:

Option 1: The player should create two in a row to force the opponent into defending, as long as it doesn't result in them creating a fork. For example, if "X" has two opposite corners and "O" has the center, "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, the player should block that fork.

Center: A player marks the center. (If it is the first move of the game, playing on a corner gives the second player more opportunities to make a mistake and may therefore be the better choice; however, it makes no difference between perfect players.)

Opposite corner: If the opponent is in the corner, the player plays the opposite corner.

Empty corner: The player plays in a corner square.

Empty side: The player plays in a middle square on any of the 4 sides.

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