It is a common playground claim: “If I go first, I always win.” In Tic-Tac-Toe, there is a grain of truth to this — the first player does have a measurable advantage. But the full picture is more nuanced. Going first helps, but it does not guarantee victory.

The Statistical Advantage

When you enumerate every possible game of Tic-Tac-Toe — all 255,168 of them — the results heavily favor X:

Outcome Count Percentage
X wins 131,184 51.3%
O wins 77,904 30.5%
Draw 46,080 18.1%

X wins nearly 1.7 times as often as O across all possible games. That is a significant statistical edge.

Why X Has the Edge

The advantage comes down to simple arithmetic. In a game that goes the full nine moves:

  • X makes 5 moves (turns 1, 3, 5, 7, 9)
  • O makes 4 moves (turns 2, 4, 6, 8)

That extra move gives X more raw material to build winning lines. More importantly, X gets the critical first and last moves. The first move sets the strategic tone, and the ninth move (if the game lasts that long) belongs to X, providing a final chance to complete a line.

Beyond counting, X also benefits from initiative. X gets to create threats before O has a chance to set up. This means O is frequently forced into defensive positions, spending moves blocking instead of building.

Why It’s Not Enough to Win

Despite all these advantages, X cannot force a win against a competent O player. Here’s why:

The board is too small. With only nine squares and eight winning lines, O always has enough time to block X’s threats. There is never a point where X can create a fork that O cannot see coming and prevent — provided O responds correctly from the start.

O’s defensive resources are adequate. O only needs to block one line per turn, and the compact geometry of the 3×3 grid means blocking one threat often simultaneously defends against others.

Perfect play leads to a draw. This has been proven exhaustively by computer analysis. No matter what X does, O has a response that prevents a loss.

The Importance of O’s First Response

The single most impactful moment for O is the response to X’s opening move. Get it right, and a draw is achievable. Get it wrong, and X may create an unblockable fork:

  • If X opens center, O must reply with a corner. An edge reply allows X to fork.
  • If X opens corner, O must reply with the center. Any other response risks a fork.
  • If X opens edge, O should reply with the center. This neutralizes X’s limited options.

After that critical first response, the game’s trajectory is largely determined. Correct play from both sides leads to a draw in every variation.

First-Move Advantage in Other Games

Tic-Tac-Toe’s first-player advantage is mild compared to some other games:

  • Connect Four — The first player can force a win with perfect play. The advantage is decisive.
  • Chess — White (first player) wins more often at all levels of play, but the advantage is not sufficient to force a win.
  • Go — Black (first player) has an advantage that is compensated for by a point bonus called komi given to White.
  • 3D Tic-Tac-Toe (4×4×4) — The first player can force a win. The larger board provides enough winning lines that the second player cannot block them all.

Tic-Tac-Toe falls into the category where the first-player advantage is real but insufficient — the second player can always equalize with correct play.

Making It Fair

If you want to keep Tic-Tac-Toe fair over multiple games, the simplest solution is to alternate who plays X. Over an even number of games, both players get equal turns as X and O, balancing out whatever advantage exists.

Some communities use the “pie rule” (also called the swap rule): after X makes the first move, O can choose to either respond normally or swap roles — taking X’s position and letting the original X player become O. This discourages X from making an overly aggressive first move, since O might just take it.

The Bottom Line

Going first in Tic-Tac-Toe gives you a real but limited advantage. You get an extra move, you set the tempo, and you win a larger share of random games. But against a player who knows the right responses, that advantage evaporates into a guaranteed draw. The claim “first player always wins” is a myth — but it is a myth rooted in a genuine statistical truth.

For the full strategic playbook, see our strategy guide or explore every possible outcome in detail.