Gomoku vs Connect Four
Gomoku and Connect Four are both connection games, but their placement rules create very different choices. In Connect Four, a disc falls within a column. In Gomoku, players place stones on chosen intersections of a flat grid. Neither label alone identifies a single rule set, so agree on the variant before comparing strategy.
| Feature | Connect Four | Gomoku / five-in-a-row |
|---|---|---|
| Placement | Choose a column; gravity determines the slot | Choose an empty intersection |
| Common board | 7 columns by 6 rows | Formal Renju uses 15x15; casual games vary |
| Win condition | Four in a row | Usually five in a row; overline handling varies |
Gravity Is the Central Difference
Gravity means a Connect Four move is limited by the current stack in a column. On a flat Gomoku board, a player can place a stone in any empty intersection, so threats can be built in more directions. That freedom also means players need to inspect more possible lines and blocks before moving.
How the Board Changes Your Decisions
In Connect Four, a column is both a move and a timing decision. Playing in one column changes which slots are available above it, can support a future diagonal, and may give the other player access to a useful reply. You cannot simply choose the exact square you want. The bottom of the column must be available, and every later disc is constrained by the stack below it.
In Gomoku, the chosen intersection is the move. A stone can extend a horizontal, vertical, or diagonal line immediately, and the same placement may belong to several possible lines. The board is larger, so the important question is often not “Which column is best?” but “Which intersection creates a threat that cannot be answered comfortably?”
This makes the games feel different even when both players are trying to connect pieces. Connect Four rewards reading the consequences of a column from the bottom upward. Gomoku rewards reading open space around a stone and comparing several potential continuations. A player who is strong at one game may understand the other quickly, but should not copy a complete opening system without learning its placement rule.
Win Conditions and Rule Scope
The standard Connect Four target is four adjacent discs horizontally, vertically, or diagonally. The standard Gomoku target is related but usually requires five stones on a flat grid. Gomoku is a family of rule sets: free-style games may count five or more, casual games may require exactly five, and formal Renju adds restrictions for Black and a structured opening procedure.
That distinction matters when someone asks whether one game is “solved” or whether one first move is always best. A mathematical result for a defined Connect Four board does not describe every four-in-a-row variant. A result for an unrestricted Gomoku board does not automatically describe Renju, a smaller board, or this site's exact-five browser implementation.
Which Game Is Better for Beginners?
Connect Four is often easier to teach in one sitting because the rack limits the legal actions and makes the pieces easy to handle. A beginner can learn to look for a direct four, block the opponent, and avoid giving away a diagonal. The compact board also makes it possible for both players to see the whole position at once.
Gomoku is a good next step for players who want free placement and more room for planning. Start on a 9x9 board, agree whether five or exactly five wins, and practice the immediate-win/immediate-block scan. Move to 13x13 or 15x15 once players can follow threats in all four directions. The related games comparison places Gomoku beside Connect Four, Go, and Tic-Tac-Toe so you can choose the right starting point.
Can You Play Both Online?
Many browser game portals host both connection games, but a page labeled “online” can mean different things: a local game against a computer, pass-and-play on one device, or a private room for remote friends. Check the mode before inviting someone. A game can be free and browser-based without providing a synchronized online room.
This site focuses on Gomoku. Its board supports local AI and pass-and-play on 9x9, 13x13, and 15x15 boards; it does not currently provide Connect Four, a remote Gomoku room, or an account-based ranking system. If you want to practice the game discussed here, open the Gomoku browser board. If you want a physical game with gravity, choose a standard Connect Four set instead of trying to use a Gomoku grid.
Strategy Transfer: What Helps and What Does Not
| Habit | Useful in both | Game-specific warning |
|---|---|---|
| Look for an immediate win | Yes: always check whether the current move ends the game | The winning pattern is four in Connect Four and usually five in Gomoku |
| Block the opponent | Yes: a direct winning threat takes priority | A Gomoku block can be any intersection; Connect Four blocks a reachable slot in a column |
| Build two threats | Often useful | Gravity changes whether the second threat is actually playable in Connect Four |
| Play near existing pieces | Usually useful | In Gomoku, distance and open intersections matter; in Connect Four, the column stack controls access |
Do Not Overgeneralize "Solved" Results
The standard 7x6 Connect Four game has a well-known first-player solution. Separately, published research by Victor Allis established a first-player result for a defined unrestricted 15x15 Gomoku setting. These results belong to their exact rules and do not automatically transfer to formal Renju, smaller boards, exact-five house rules, or a site's local AI.
Choosing a Game
Connect Four can suit players who enjoy a compact physical game and gravity tactics. A five-in-a-row game can suit players who want free placement and longer-line pattern study. The best choice is preference, not an objective ranking. For either game, begin by learning the immediate win and immediate block patterns before pursuing complex claims about openings.
From Connect Four to Gomoku: A Practical Bridge
If you already play Connect Four and want to move into Gomoku, the transition is smoother than it looks. The core habits carry over: scan for an immediate win, scan for an immediate block, and build positions that create two threats at once. What changes is the geometry. In Connect Four, a threat is built by stacking in one column and reading the timing of when the opponent can answer. In Gomoku, a threat is built by connecting stones on a flat grid, and the same placement can extend three or four different lines at once.
Start with a 9×9 board and agree on the rule — exactly five wins, or five or more. A 9×9 board keeps the position manageable while still requiring you to think in more directions than Connect Four's 7×6 grid. Practice the "immediate win / immediate block" scan for a few games before moving to 13×13. The bigger board is not harder in the way Connect Four's timing is harder; it is just wider, and the winning patterns look the same once you can see them.
Common Mistakes When Switching from Connect Four
- Thinking in columns instead of intersections. Connect Four trains you to think vertically. In Gomoku, a stone can extend diagonally in two directions, horizontally, and vertically at the same time. If you keep asking "which column?" the answer is "all of them." Instead ask "which intersection creates a threat that cannot be answered?"
- Forgetting the overline rule. In Connect Four, four is the target and five does not exist. In casual Gomoku, five-or-more may all win; in formal Renju, overlines are forbidden. If your friend plays under a different overline rule than you assume, the same position produces different results. Agree before the first move.
- Trying to force a vertical pattern. Connect Four rewards diagonal and vertical fours. In Gomoku, open threes and open fours in any direction are equally strong. A player who only looks for the "Connect Four diagonal" will miss open verticals and open horizontals that are just as dangerous.
- Underestimating the block. Connect Four blocks are concrete: the slot above the opponent's disc. In Gomoku, a block means occupying the only intersection that stops the opponent's winning line. Because the board is open, a failed block is worse — the opponent's line keeps extending into empty space where you did not expect it.
- Playing without a center. Connect Four has no "center point" in the way Gomoku does. In Gomoku, the center of the board is the strongest opening move because it has the most available lines radiating from it. If you find yourself opening in a corner or on the edge against a stronger opponent, that is a habit worth breaking.
Three Opening Ideas to Steal from Connect Four
The opening habits that work in Connect Four transfer directly, but the geometry is different. Here are three ideas to start with:
1. Force the opponent's first reply
In Connect Four, opening in the center column forces the opponent to decide where they block or build. In Gomoku, opening at the center point forces the opponent into a symmetric reply or a break in symmetry. Either way, you get to see how they think before committing your second move.
2. Build two directions at once
Connect Four's classic winning shape is a three-in-a-row with both ends open. The Gomoku equivalent is a stone placed where it extends an existing two in one direction and a two in another direction simultaneously. You now have two open threes. The opponent can block one; you win with the other.
3. Sacrifice a block to create a double threat
Sometimes the best move is not the block but the move that creates a threat your opponent cannot answer. In Connect Four this is rare because the board is small. In Gomoku the open space makes it common: you leave one line open, build two new threats on the other side, and the opponent cannot block both.
Frequently Asked Questions
Can I play Gomoku on a Connect Four rack?
Not under ordinary Gomoku rules. The rack's gravity prevents free placement on a flat grid. Use a printed grid, graph paper, or a suitable board instead.
Is five-in-a-row harder than Connect Four?
They challenge different skills. Gomoku offers more legal placements on a typical board; Connect Four's gravity creates its own tactical constraints. Difficulty depends on the rules, players, and how deeply they study the game.
Does this site's game use Connect Four-style gravity?
No. Stones are placed on empty intersections. The site uses an exact-five rule and supports local play only.
Which should I learn first, Connect Four or Gomoku?
Connect Four is the easier starting point: the board is smaller, the legal moves are more constrained, and a full game ends in a few minutes. Once you can reliably spot an immediate win and block one, move to Gomoku on a 9×9 board. The jump is mostly about thinking in more directions, not about a new set of rules.
Is Connect Four a "genuine" board game or just a toy?
It is a genuine combinatorial game with a well-studied solved endgame on the standard 7×6 board. The first player has a documented winning strategy. "Simple to learn" and "deep to master" are not the same thing, and Connect Four has both.