How to Win at Connect Four: Strategy, Tactics, and the Perfect First Move

What Is Connect Four?

Connect Four is a two-player strategy game played on a grid that stands upright — seven columns wide and six rows tall, for forty-two slots in total. Each player has a colour of disc, and players take turns dropping one disc into a column of their choice. Because the board is vertical, gravity pulls each disc down to the lowest empty slot in that column. The winner is the first player to line up four of their own discs in an unbroken row — horizontally, vertically, or diagonally. It was published by Milton Bradley in 1974 and has been a family staple ever since. You can play it right now against a smart computer or a friend on our free Connect Four game.

The Rules in Full

• The board. Seven columns, six rows. Forty-two total slots.
• Turns. Players alternate, dropping exactly one disc per turn into any column that is not already full.
• Gravity. A dropped disc always falls to the lowest available slot in its column — you choose the column, not the exact square.
• Winning. The first player to connect four of their discs in a line — across, up-and-down, or on either diagonal — wins instantly.
• Draw. If all forty-two slots fill without anyone making four in a row, the game is a tie.

That is the entire rulebook. The depth comes not from complicated rules but from the fact that every disc you drop permanently changes the landscape — raising the landing height of a column and opening or closing lines for both players.

Why the Centre Column Wins

If you remember only one piece of strategy, make it this: play the centre column first, and fight to control it. The reason is pure geometry. A four-in-a-row can run through any given square in several directions, and the central squares participate in more potential winning lines than any others. A disc in the middle column can be part of horizontal fours, a vertical four, and both diagonals; a disc jammed against the left or right wall takes part in far fewer. Control the centre and you simply have more ways to win and more ways to threaten — which is exactly why a strong computer opponent always opens in the middle.

The Winning Tactic: The Double Threat

Almost every won game of Connect Four comes down to a single idea: the double threat, sometimes called a “seven” or a fork. A threat is a spot where, if you drop a disc, you complete four in a row. Your opponent can block a single threat easily — they just take that square. But if you can arrange the board so that one move creates two threats at the same time, your opponent can only block one of them, and you win with the other on your next turn.

The whole art of Connect Four is manoeuvring toward a position where a double threat becomes available, while denying your opponent the chance to do the same. Often this means quietly building two separate three-in-a-rows that share a common setup square, so that filling that square lights up both threats at once.

Odd and Even: The Threat Theory Experts Use

Here is the concept that separates casual players from strong ones. Number the six rows from the bottom up, 1 to 6. A threat (a square that would complete a four) sits on either an odd row (1, 3, 5) or an even row (2, 4, 6). Because players alternate turns and columns fill from the bottom, whose turn it is when a given square finally becomes playable is not random — it is determined by parity.

The practical takeaway: if you moved first, try to create your threats on odd rows, because when the board eventually fills toward them, the timing tends to hand you the winning move. If you moved second, aim for even-row threats. You do not have to calculate this perfectly to benefit — simply being aware that the height of a threat matters, not just its existence, will improve your play immediately.

Connect Four Is a Solved Game

One of the most remarkable facts about Connect Four is that it has been completely solved by computer. In 1988, independently, James Dow Allen and Victor Allis proved that the first player can always force a win — provided they start in the centre column and then play perfectly thereafter. If the first player opens anywhere else, the outcome with perfect play from both sides is a draw. This makes Connect Four one of the earliest non-trivial games to be fully solved.

Does that ruin the fun? Not at all. “Solved” means a perfect player could force the result, but no human plays perfectly — the winning line requires flawless calculation dozens of moves deep. Against a human or a non-perfect computer, the game stays genuinely competitive. What the solution really tells you is a practical lesson: going first is a real advantage, and the centre column is where that advantage lives.

A Step-by-Step Game Plan

1. Open in the centre. If you move first, your first disc goes in the middle column, every time.
2. Contest the centre. If you move second, play the centre too, or the columns next to it — do not let your opponent stack the middle unchallenged.
3. Develop, don't lunge. Build flexible positions that keep several lines alive rather than committing everything to one obvious threat that is easy to block.
4. Scan for their threats every turn. Before you play your plan, check whether the opponent has a three-in-a-row with a playable open end. If they do, block it.
5. Set up a double threat. Look for a square that would create two threats at once, and steer the game toward making it playable on your turn.
6. Mind the parity. Prefer threats on odd rows if you went first, even rows if you went second.

Common Mistakes to Avoid

• Ignoring the centre. Playing the edges early cedes the most valuable real estate on the board. Fight for the middle.
• Missing the opponent's three-in-a-row. The single most common way to lose is to be so focused on your own plan that you fail to block an obvious threat. Check every turn.
• Handing over a win from below. Beware of dropping a disc directly beneath a square that completes the opponent's four — you have just built them a staircase to victory.
• Making one threat and stopping. A single threat is always blockable. If your attack is not building toward a double threat, it will fizzle.
• Playing too fast. Connect Four rewards a few seconds of calculation. Look one move ahead for both sides before you commit.

How to Beat the Computer

Practising against a computer opponent is the quickest way to sharpen your game, and our Connect Four offers three levels. On Easy, the computer takes obvious wins and blocks obvious threats but does not plan ahead — a good place to practise building your first double threats. Medium looks a few moves deeper and will punish careless play. Hard runs a proper minimax search with alpha-beta pruning, evaluates the whole board, and prizes the centre, so beating it takes real planning. Two things are always true at every level: it will grab a winning move the instant one exists, and it will block yours whenever you threaten four. To beat the Hard computer, take the centre when you can, avoid giving it easy blocks, and patiently manoeuvre toward a fork it cannot parry. Use the Undo button freely to replay a critical moment and learn how the engine responds.

Popular Connect Four Variations

Once the standard game feels familiar, a few well-known variations keep it fresh and stretch your tactics in new directions:

• Pop Out. On your turn you may either drop a new disc on top or “pop” one of your own discs out of the bottom of a column, sliding everything above it down. This can dismantle an opponent's line and dramatically deepens the strategy.
• Power Up / Power Checkers. Special discs with abilities — such as a disc that removes the piece below it, or a “wall” that blocks a slot — add a light element of surprise.
• Five-in-a-Row / larger boards. Playing on a wider or taller grid, or requiring five in a row instead of four, resets the solved-game advantage and makes every match a fresh puzzle.
• Connect Four 3D. Played on a cube, where lines can run through three dimensions — a serious step up in visualisation.

Each variant borrows the same drop-and-connect core but rewards slightly different planning, which is part of why the game has stayed popular for half a century.

A Short History of Connect Four

Games of lining up counters are ancient, but the specific vertical, gravity-fed version we know was released by Milton Bradley in 1974 under the name “Connect Four,” and it was an instant commercial hit. It gained a second life as a favourite subject for computer scientists: because the rules are simple yet the game tree is large — around four trillion possible positions — it became a natural benchmark for game-solving techniques. When it was fully solved in 1988, Connect Four earned a permanent place in the history of artificial intelligence as a landmark example of a completely analysed game.

Is Connect Four Good for Your Brain?

For a game you can teach a five-year-old, Connect Four gives the mind a real workout. It trains you to think ahead and visualise the board a move or two into the future, to recognise patterns and threats at a glance, and to balance attack with defence — the constant question of whether to build your own line or stop your opponent's. Because a game lasts only a few minutes, it is an ideal quick mental exercise, and playing against a stronger opponent steadily builds the planning skills that transfer to other strategy games and puzzles.

Frequently Asked Questions

What is the best first move in Connect Four?

The centre column, without exception. Central discs take part in the greatest number of possible four-in-a-rows, so opening in the middle maximises your winning chances — and it is the only opening from which the first player can force a win with perfect play.

Does the first player always win?

With perfect play, yes — Connect Four is solved and the first player can force a win by starting in the centre. But perfect play is extraordinarily hard for humans, so in real games between people the first-move edge is an advantage, not a guarantee.

What is a double threat?

A double threat is a single move that creates two separate winning threats at the same time. Since your opponent can only block one of them per turn, the other threat wins the game. Setting up a double threat is the core winning tactic in Connect Four.

How do you always block in Connect Four?

Every turn, before you play your own plan, scan the board for any place your opponent has three of their discs in a line with a playable open end, and drop a disc to occupy that end. The trap to watch for is a threat you cannot yet block because the square below it is empty — plan ahead so you are never forced to fill that square for them.

Is Connect Four a game of luck or skill?

Almost pure skill. There is no dice or shuffle — both players have complete information and full control of their moves. Outcomes are decided by who plans better, spots threats faster, and sets up the winning fork, which is why a stronger player beats a weaker one very consistently.

How many pieces are in Connect Four?

A standard set has 42 discs — 21 of each colour — exactly enough to fill the 7×6 board if a game goes all the way to a draw. In practice most games end well before the board fills.

Start Playing

The fastest way to absorb all of this is to play with the ideas in mind. Our free online Connect Four lets you take on a smart computer at three difficulty levels or a friend in two-player mode, with unlimited undo so you can experiment and a winning-line highlight so you can see exactly how each game was won. It runs entirely in your browser — no download, no signup. Take the centre, build a double threat, and put your new strategy to the test.