<——— Back to Tic-Tac-Toe Logic Puzzle

The aim of this quiz is to place Xs and Os correctly into each cell on the 3×3 grid, as in a tic-tac-toe game. A player wins when having occupied the entire row, column, or diagonal with the same symbol. Otherwise the game ends in a draw.

**Cell 1** tells you three things at the start of the game:

- The game ended in a draw.
- ‘X’ occupies opposite corners.
- No other hints are necessary for solving the puzzle.

Since Cell 1 is a corner and is an ‘O,’ we know that **Cell 3** and **Cell 7** must both be **‘X.’**

Because the game ended in a draw, we can conclude that **Cell 5** must be an **‘O’** in order to prevent a tic-tac-toe from occurring with Cells 3 and 7.

Knowing the rules of tic-tac-toe, we can fill in the remaining squares using just logic in order to force a draw.

**Cell 9** must be an ‘**X****‘** to block the tic-tac-toe for 1 and 5.

**Cell 6** must be an **‘O’** to block the tic-tac-toe for 3 and 9.

**Cell 8** must be an **‘O’** to block the tic-tac-toe for 7 and 9.

**Cell** **2** must be an **‘X’** to block the tic-tac-toe for 5 and 8.

**Cell 4** must be an **‘X’** to block the tic-tac-toe for 5 and 6.

The final layout of the tic-tac-toe board is:

**O X X**

**X O O**

**X O X**