Connect Four: The Winning Opening Explained

Connect Four is actually a solved game, and the player who goes first can always win, so I want to show you the opening and ideas that put those odds firmly in your favor.

1. Why I always open in the center

The center column is the single best first move, and it is not close. A disc in the middle column can be part of more winning lines than a disc anywhere else, because four-in-a-row can run through it horizontally, vertically, and on both diagonals.

If I move first, I drop in the center every time. If I move second, I contest the center as soon as I can, because whoever owns it controls the most lines.

2. Build vertical and diagonal threats

Beginners chase the obvious vertical stack of four, which is easy for an opponent to block. I use that vertical threat as bait while quietly building diagonals, which are the hardest lines to see coming.

Reading the diagonals

I look for spots where my discs already sit two apart on a slant, since those grow into diagonal fours that opponents routinely miss. Mixing a visible vertical threat with a hidden diagonal is how I win most games.

Horizontal threats deserve respect too, especially the open-ended three, where I have three discs in a row with an empty playable slot on both ends. My opponent can only plug one side, so the other completes my four. Setting up an open three is one of the cleanest ways to force a win, and I build toward it whenever the bottom rows give me the room.

3. Create a double threat to force a win

The real key to winning is the double threat. This is a position where I am one move from completing two different fours at the same time. My opponent can only block one of them, so the other one wins on my next turn.

I spend the opening setting up shapes that can branch into two threats at once, rather than going for a single line my opponent can simply cover.

4. Block without losing the initiative

When my opponent makes a threat I have to respond, but I try to block in a way that also helps me. The ideal blocking move adds to one of my own lines while it shuts down theirs, so I stay on the attack instead of just reacting.

If a block does nothing for me, I still play it, because allowing four-in-a-row loses instantly. Survival comes first, then I rebuild pressure.

5. Use odd and even threats

This is the idea that separates strong players. Counting from the bottom, the first player tends to win with threats on odd rows, while the second player benefits from threats on even rows. Because discs stack upward, the row a threat lands on decides who gets to fill it.

As the first player I aim my key threats at odd rows and avoid handing my opponent an even one. Even a rough feel for this turns close games into wins.

The reason this works comes down to who is forced to fill the deciding square. Because pieces always fall to the lowest open slot, the columns fill in a predictable parity, and the player whose threat lands on a square the opponent must eventually play under is the one who collects the win. I do not need to calculate this perfectly. Just knowing that my threats want to live low and on odd rows nudges every game in my direction.

Put it all together and a Connect Four game has a clear shape: seize the center, develop a couple of overlapping threats, force the double attack, and respect parity. None of it is flashy, but it is the reason a prepared first player wins so reliably.