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Tic tac toe

You
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Computer
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Draws
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Your turn: you are X.

How do you play tic tac toe?

Two players take turns putting X and O in the 9 squares of a 3 by 3 board. The first to get 3 marks in a row, across, down or on a diagonal, wins; a full board with no line is a draw. Play the computer on Easy, Medium or Unbeatable, or a friend on the same device.

How to play tic tac toe

  1. Two players take turns: one puts X in an empty square, the other O.
  2. Three marks in a row win: across, down, or on a diagonal.
  3. When all 9 squares are full and nobody has 3 in a row, the game is a draw.

Play against the computer at Easy, Medium or Unbeatable, or choose 2 players and take turns on one phone or computer. The first move goes to each side in turn. On a keyboard, keys 1 to 9 pick the squares, row by row.

How to never lose at tic tac toe

  • Win first: if you have 2 in a row with the third square empty, take it.
  • Block next: if the other player has 2 in a row, take the third square.
  • Going first, take a corner. Going second, take the middle if it is free.
  • Make a fork: a move that makes two lines of 2 at once. Only one can be blocked.

With best play from both sides, every game of tic tac toe ends in a draw. That is why the Unbeatable computer can never lose: it looks at every possible game to the end.

Questions

Can you beat the Unbeatable computer?

No. It looks at every possible game to the end, and with best play every game of tic tac toe is a draw. The best you can do is draw. Try Medium to win: it blocks and wins when it sees a line, but it can miss a fork.

How do you never lose at tic tac toe?

Take a win when you have 2 in a row, and block when the other player has 2. Going first, take a corner; going second, take the middle. Watch for forks: one move that makes two lines of 2 at once.

Is this tic tac toe unblocked at school?

It is a normal web page on lifesim.com, with no download and no sign-up, so it opens on most school Chromebooks. We can't promise that every school filter allows it.

Can two people play on one phone?

Yes. Choose 2 players and pass the phone: X and O take turns, and the page keeps the score of every game until you leave. The first move goes to each player in turn.

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