How to Win Tic Tac Toe: Strategy for Every Game

Most people can already stop themselves losing at tic tac toe. Winning is harder, because a competent opponent will block every single threat you build. This guide covers the one tactic that gets past that — and is honest about when nothing will.

The short answer

To win at tic tac toe you need a fork: one move that creates two threats at the same time. A single threat is always blockable, because your opponent can take the one square that stops it. Two threats at once are not, because they only get one move. Everything below is about setting that up — and about not losing while you try.

Not all squares are equal

Before any tactics, this is the fact everything else rests on.

There are eight winning lines. Count how many pass through each square:

Square type	Winning lines through it	Squares
Centre	4	1
Corner	3	4
Edge	2	4

A mark in the centre contributes to four possible wins. The same mark on an edge contributes to two. That is why the centre is the strongest opening and why edges are usually a wasted early move.

If you go first (playing X)

X places five of the nine marks, and moving first is a real advantage. Use it.

Move 1: take the centre. It is the single strongest square, and taking it denies your opponent the same.

Move 2: take a corner — ideally one that starts building toward a fork. After you have the centre, corners are where your second threats come from.

Move 3: complete the fork if it is available. This is where games are won. The classic pattern is the one in the image at the top of this article, and it is worth walking through properly.

The corner fork, step by step

Start in a corner rather than the centre. That is a deliberate trap: it invites a reply that loses.

1. X takes a corner. Say the top-left.
2. O replies in the centre. This is O’s correct move, and the fork below still works.
3. X takes the opposite corner — bottom-right. X now has two opposite corners with O in the middle.
4. O takes another corner. This is the mistake. O should play an edge here.
5. X takes the third corner. X now has three corners, and two separate lines are open at once — the left column and the bottom row. O can only block one.

The position after step 5 is the one shown in the article image: two squares are marked in red, and each of them wins for X. Whichever O takes, X plays the other.

Why an edge saves O

At step 4, if O plays an edge square instead of a corner, it creates a threat of its own that X must answer. That single tempo is enough to stop the fork ever forming. It is the whole reason strong players prefer edges in that specific position, despite edges being weak squares in general: the value lies in forcing a response, not in the square itself.

If you go second (playing O)

Playing second, you cannot force a win against correct play. Your job is to not lose, then take whatever your opponent gives you.

If X took the centre: take a corner. Never take an edge here — it hands X a fork almost immediately.

If X took a corner: take the centre. Anything else and X’s fork becomes very hard to stop.

If X took an edge: take the centre. X has made a weak opening and you are now in good shape.

After that, block every threat the moment it appears, and watch for X leaving you a fork of your own. Against anyone below expert level, X will eventually build a single threat instead of a double one, and the game drifts to a draw — which, playing second, is a good result.

Blocking properly

Blocking is not optional. If your opponent has two marks on a line and the third square is open, that square is your only legal-in-practice move.

Two refinements separate good blocking from adequate blocking:

Block with a square that also builds. Often two different squares would stop the same threat, or the blocking square sits on a line you are also developing. Pick the version that leaves you with something.

Answer a fork with a threat, not a block. If your opponent is one move from a fork, blocking one of the two future squares usually does not help — they simply take the other. Instead, make a threat of your own. They must answer it, and that stolen tempo can break the fork before it exists.

Example positions worth recognising

You have two in a line, third square open. Take it. Do not check anything else first. The game ends immediately and nothing else on the board matters.

Your opponent has two in a line, third square open, and so do you. Take yours. You move first in this exchange, so you win before their threat ever comes due. Beginners often block here out of habit and lose a won game.

You have the centre and two opposite corners. You are one move from a fork. Look at the two remaining corners and check which one opens two lines.

Your opponent has two opposite corners and you have the centre. You are about to be forked. Play an edge square that creates a threat, forcing them to respond.

The limits of perfect play

Here is the part most strategy guides leave out: none of this wins against an opponent who does not make mistakes.

Tic tac toe is a solved game. Every possible sequence of moves has been worked out, and the conclusion is that correct play from both sides always ends in a draw. Neither X nor O can force a win. The tactics above are not a way to beat perfect play — they are a way to punish imperfect play, which is what you will almost always be facing.

You can verify this directly. The Hard opponent in Tic Tac Toe searches every possible continuation before each move, so it never errs. Play against it and you will find that every well-played game ends level, no matter which of the openings above you try. Holding it to a draw is the real achievement.

Against Medium, the picture is completely different. It always takes a win it can see and always blocks a threat it can see — but it only looks one move ahead, so it cannot spot a fork forming. Every fork in this article works against it. That makes it the ideal opponent to practise on: start a game, try the corner fork, and watch it dutifully block one line while you win with the other.

Putting it together

1. Every turn: can I win now? Can they win next? Only then, what is best?
2. Opening: centre first, corner second, edge only with a reason.
3. Build toward two threats, not one.
4. When you must block, block with a square that also builds.
5. When facing a fork, threaten instead of blocking.
6. Accept the draw when the position is equal — that is the correct result, not a failure.

Frequently asked questions

Is there a way to always win at tic tac toe?

No. Tic tac toe is a solved game: if both players play perfectly, every game ends in a draw. There is no forced win for either side. What you can do is play in a way that never loses, and that creates the maximum number of chances for your opponent to slip.

What is the best first move in tic tac toe?

The centre. It belongs to four of the eight winning lines, more than any other square, so it appears in twice as many of your potential wins as an edge square does. If the centre is already taken, a corner is the next best choice.

What is a fork in tic tac toe?

A fork is a single move that creates two separate lines where you have two marks and the third square is empty. Your opponent can only block one square per turn, so whichever they choose, you complete the other line and win on your next move.

Can the second player ever win?

Yes, but only if the first player makes a mistake. O cannot force a win against correct play. O's realistic goal is to take the centre if X did not, block every threat immediately, and wait for X to leave a fork available.

• tic tac toe strategy
• forks
• how to win
• tactics