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Players alternate placing stones of their color on intersections of a grid, typically 15x15 or 19x19. The first player to form an unbroken line of exactly five stones horizontally, vertically, or diagonally wins. In standard free-style Gomoku, lines longer than five also count as wins, though professional rulesets often restrict this. Click or tap an intersection to place your stone. The game continues until one player achieves five in a row or the board is filled.
Winning positions in Gomoku require creating double threats: two simultaneous lines of four that are each open at both ends, so that no single move by the opponent can block both. An open three, three stones in a row with both ends clear, threatens to become an open four, which threatens to become five. Chains of these threats, built across multiple intersections, force opponents into defensive positions where they cannot attack simultaneously.
Gomoku is often introduced to Western players in the context of Go clubs, since both games use the same board and stones. While Go has a far larger strategic depth, Gomoku offers an entry point with immediately comprehensible objectives. Competitive Gomoku has organized international tournaments since the 1980s, with rules committees addressing first-player advantages through restricted opening protocols. In casual play across the United Kingdom, Europe, and North America, it is frequently played on paper grid sheets as a classroom or leisure game without a dedicated board.
Attack alone does not win Gomoku; failing to read your opponent's threats loses games even when your own offense looks strong. The cardinal rule is to block an open four immediately, because four stones in a row with an empty end can complete to five on the next move and cannot be stopped if ignored. An open three, three in a row with both ends clear, is dangerous because it threatens to become an open four, so respond before it matures rather than after. The hardest situations are double threats, where one opponent stone creates two separate winning lines at once; since you can only block one per turn, you must prevent the double from forming in the first place by interrupting the supporting stones early. Always check whether your own attacking move accidentally lets the opponent build a line elsewhere before you commit to it.
The first several stones decide which player dictates the game's shape. Because the first player holds a strong advantage in free-style Gomoku, opening near the center of the board maximizes the directions in which your lines can grow; edge and corner starts cut off potential winning rows. Competitive rulesets since the 1980s have added restricted opening protocols precisely to curb this first-move advantage, which tells you how powerful central play is. As the second player, your early stones should contest the center and sit close to the opponent's cluster so you can interfere with their formations rather than building in isolation on a distant part of the grid. Keep your stones connected enough to support multiple potential threats at once, but spread enough that a single opponent block cannot neutralize your whole position. Flexibility in the opening sets up the double threats you will need later.
In standard free-style Gomoku as played here, a line of five wins, and longer unbroken lines also count. Many professional rulesets restrict overlines so only exactly five wins, but in casual play forming six in a row generally still secures the victory.
They share a board and stones but have opposite goals. Gomoku is won by forming a line of five, a direct race to connect stones. Go is about surrounding territory and capturing stones, a far deeper game. Gomoku is faster to learn and quicker to finish.
A double threat is one move that creates two separate lines, each one move from completing five. Since your opponent can only place one stone per turn, they can block only one of the two lines, leaving the other open for you to finish.
The opening player can build toward the center first and force the opponent into reacting. The edge is large enough that competitive Gomoku introduced restricted opening rules specifically to reduce this first-move advantage, which shows how decisive an unrestricted center opening can be.
Defend first when the opponent has an open four, since that completes to five immediately if unblocked. Against an open three, you can sometimes ignore it to push your own faster threat, but never trade away a guaranteed loss to chase offense.