How to Play Gomoku
Gomoku is a two-player abstract strategy game played on a grid board. Players alternate placing stones, aiming to build an unbroken line of five in a row before their opponent does. The rules take under two minutes to explain, yet the game supports deep tactical play.
Its appeal lies in that tension between simplicity and depth. A single misplaced stone can cost the game; a well-disguised threat can win it in moments. Gomoku is commonly played on a dedicated 15x15 board, though a standard 19x19 Go board works equally well.
A little history
Gomoku is widely believed to have originated in East Asia, with Japan and China both having long associations with the game. The name comes from the Japanese, roughly meaning 'five pieces'. Its precise origins are unclear, and the historical record before the nineteenth century is thin, but the game was well established in Japan by the Meiji period and spread to Europe during the twentieth century, where it gained a following as a standalone pursuit separate from Go.
Setting up
- Place the board flat between both players on a stable surface.
- Decide who plays black and who plays white. Black always moves first.
- Each player takes a supply of their colour stones. No pre-placement is needed; the board starts empty.
How to play
- Black places one stone on any intersection of the grid on their first turn.
- Players then alternate turns. On each turn a player places exactly one stone of their colour on any empty intersection.
- Once placed, stones are never moved or removed during normal play.
- Continue alternating until one player forms an unbroken row of exactly five stones in a line, or the board is full.
- A winning line may run horizontally, vertically, or diagonally.
- If the board fills with no five-in-a-row formed, the game is a draw.
Winning and scoring
The first player to place five of their stones in an unbroken, consecutive straight line wins immediately. The line must contain exactly the right stones with no gaps. In standard Gomoku, a line of six or more counts as a win just as five does, unless the table has agreed in advance to play the 'exactly five' variant, in which case a six-or-more line does not win. Agree this rule before play begins.
The fine points
The most common dispute concerns overlines: a run of six or more stones in a row. In the most widely played casual version, an overline counts as a win for the player who created it, because stopping your opponent from extending is part of good defence. Under 'exactly five' rules, an overline is void and play continues, which changes strategy significantly since a player can deliberately extend a threat to neutralise it.
A second recurring question is simultaneous threats. If on a single turn a player creates two separate four-in-a-row threats, the opponent cannot block both; this is a winning position called a 'double four' or 'four-four'. Some competitive rulesets restrict black from creating certain double-threat patterns on the first move to reduce the first-mover advantage, but casual play typically ignores these restrictions. Agree any such restrictions before you begin.
How to win more often
- Play towards the centre early. Stones near the edges have fewer directions in which to build a five, giving you less flexibility.
- Build threats in two directions at once. A single four-in-a-row is easy to block; two simultaneous threats of three or four force your opponent to choose which to stop.
- Watch your opponent as closely as your own position. Missing a quiet three-in-a-row that becomes a four-in-a-row on the next turn is the most common way games are lost.
- Do not overextend into a single long line. Concentrating five stones in one narrow corridor is predictable and simple to block; spread your threats across the board.
- Count your opponent's liberties. If you can see they have only one way to complete a five, block it immediately even if you have an attractive move elsewhere.
Variations
Exactly Five (Strict Gomoku)
Under this rule, a player must form a line of precisely five stones to win. A row of six or more does not count as a victory and play continues. This variant rewards more careful stone placement and is sometimes preferred by experienced players because it closes off one method of forcing a win through sheer extension.
Freestyle Gomoku
The most permissive version: any unbroken line of five or more stones wins, and no restrictions apply to either player's opening moves. This is the standard casual form and the best starting point for new players. First-mover advantage is real but manageable at non-competitive levels.
Renju
A formalised competitive variant in which black faces additional restrictions designed to reduce first-mover advantage. Black is forbidden from creating a double-three, a double-four, or an overline on their turn; white faces no such restrictions. This asymmetry balances the game at a high level and is the basis of organised international tournament play.
Swap Opening
One player places three stones on the board (two of one colour, one of the other) in an opening position, then the second player chooses which colour to take. This neutralises the advantage of dictating the opening pattern and is a practical house rule for regular opponents of similar strength.
Gomoku: frequently asked questions
Does the first player always win if they play perfectly?
In theory, yes: mathematical analysis shows that with optimal play on an unbounded board, black has a forced win. In practice, at casual and even club level this is not a concern, but it is why competitive formats such as Renju introduce handicap rules for black.
Can you play Gomoku on a standard chess board?
Yes. An 8x8 chess board is too small to guarantee a five-in-a-row is always possible, but it works as a quick game. A 15x15 or 19x19 board is strongly preferred because it gives both players room to build genuine threats without running out of space.
What happens if the board is completely full and nobody has won?
The game is a draw. On a 15x15 board this outcome is extremely rare because a five-in-a-row almost always appears long before the board fills.
Does a six-in-a-row count as a win?
In standard casual Gomoku, yes. In the 'exactly five' variant, no. Agree which rule you are using before you start, as this affects how both players build and block.
Can stones be moved after they are placed?
No. Once a stone is placed on an intersection it stays there for the rest of the game. There is no capturing or removal in standard Gomoku.
Can Gomoku be played by more than two players?
Gomoku is designed for exactly two players. There is no standard multi-player format, though informal house rules with teams taking turns as one side are sometimes used.
At what age can children learn Gomoku?
Most children aged 6 and up can grasp the basic rules in a single sitting. The challenge of spotting threats develops with practice, so the game scales well as children grow.
Is it against the rules to block your opponent rather than extend your own line?
No. You are free on any turn to place your stone anywhere on the board, including purely to block your opponent. Good play often alternates between building your own threats and neutralising theirs.