Gomoku Terms Glossary for New Players

Why Learning the Lingo Helps

Gomoku is easy to start and hard to master, and the moment you read anything about strategy you hit a wall of shorthand: renju, pente, live three, VCF. This gomoku terms glossary for new players is a plain-language guide to the words that actually show up when people talk about the game. Each entry is short and practical — you can look things up while you play.

If you have never seen a gomoku board before, start with the board setup and basic rules, then come back to this glossary once the terms start appearing in guides.

The Core Terms

Five in a Row

The winning condition: five of your stones in an unbroken line — horizontally, vertically, or diagonally. Reaching it ends the game instantly.

Board / Grid

The standard board is 15×15, giving 225 intersections. Stones are placed on the intersections, not inside the squares.

Open Four

Four stones in a row with both ends empty. Your opponent can block only one end, so you win next move. This is the most important attacking shape in the game.

Closed Four

Four in a row with only one open end. A real threat, but easy to block. Closed fours are used to force your opponent to answer — each one steals a move.

Live Three

Three in a row with both ends open and room to grow into an open four. Ignore it for one move and it becomes unstoppable.

Dead Three

Three in a row where one end is blocked or the shape cannot become an open four. Dead threes are mostly harmless — don't overreact to them.

Game Types and Variants

Freestyle Gomoku

The basic, unrestricted game most people mean when they say "gomoku". Whoever gets five in a row first wins, no extra rules.

Renju

A tournament form of gomoku that adds forbidden moves for Black (the first player) to fix the first-move advantage. In renju, Black cannot make a double three, a double four, or an overline of six or more stones.

Pente

A close relative of gomoku played on a 19×19 board with an extra rule: you can capture pairs of your opponent's stones. Capture five pairs and you also win.

Swap Rule

A fairness rule used in some variants: after the first few stones, the second player may choose to swap colours. It stops either side from opening with an unfair trap.

Tactical Terms That Level You Up

Fork

One move that creates two threats at once — for example, a stone that makes both a live three and an open four. Your opponent can answer only one, so the other wins. This is the heart of gomoku attack.

Four-Three

A specific, powerful fork: a single stone that creates a four and a three at the same time. Because the four must be answered first, the three is left to become an open four.

Double Three

A fork built from two live threes. Winning in freestyle gomoku, but a forbidden move for Black in renju.

VCF (Victory by Continuous Fours)

A forcing sequence of closed fours (and open fours) where every move threatens to win, so your opponent has no choice but to block — until one four finally lands. VCF is how strong players close out a game without giving the opponent a single free move.

Mirror

A copying strategy where the second player imitates the first player's moves symmetrically. It can neutralize a simple opening, but it collapses once the position loses symmetry.

A Quick Way to Practice

The names only stick once you see them on a board. Try to make a fork, then force a win with a pattern you can spot early, and the vocabulary starts to feel natural. When playing with younger beginners, keep the rules simple for kids and introduce the terms a few at a time.

You can practice every one of these ideas free on the gomoku game page — there is nothing to download or install.