Frequently Asked Questions
Have questions about the official rules, how the Minimax computer calculates moves, or what a fork is? Browse our answers below.
What are the official rules of Tic Tac Toe?
Tic Tac Toe is played on a square 3x3 grid. Player 1 is X and Player 2 (or the AI) is O. Players take turns placing their mark in any empty cell. The first player to align three of their marks horizontally, vertically, or diagonally wins the game. If all 9 cells are filled and neither player has achieved a three-in-a-row, the game is declared a draw.
Can you win Tic Tac Toe if your opponent plays perfectly?
No. Tic Tac Toe is a mathematically "solved" game. Under perfect play from both opponents, the game always ends in a draw. To win a match, you must capitalize on a sub-optimal move (an error) made by the other player. This is why learning strategic trap patterns is highly effective against human players.
What is a "fork" in Tic Tac Toe strategy?
A fork is a board state where you create two independent winning paths at the same time. Since an opponent can only block one cell per turn, establishing a fork guarantees a win on your next turn. Most puzzles in our library focus on teaching you how to set up or prevent these forks.
Why is the center cell considered so important?
The center cell is the most strategically valuable spot on the board because it belongs to four possible winning lines (the middle row, middle column, and both diagonals). Corner cells are part of three lines, while edge side cells are only part of two lines. Controlling the center gives you high tactical coverage.
What is the Minimax algorithm used by the Impossible AI?
Minimax is a classic decision-making recursive algorithm in game theory and artificial intelligence. It maps out the full game tree of possible remaining moves and scores each branch (+10 for AI victory, -10 for human victory, 0 for draws). The computer makes the move that maximizes its score, assuming you will play to minimize it. This prevents the AI from ever making mistakes, making it unbeatable.