How to Play Gomoku — Strategy Guide From Beginner to Renju
Gomoku looks like a stripped-down chess: a 15×15 grid, black and white stones, the first player to get 5 in a row wins. But it’s deeper than it appears. Here are the techniques that get you from random placement to actual play.
Step 1: Understand the threat hierarchy
Different formations create different threats: Five — game over. Four — must block. Open three (three in a row with both ends open) — must block. Closed three (one end open) — usually safe to ignore. Two — irrelevant alone.
Most beginner mistakes: ignoring open threes. Even if the opponent’s three doesn’t seem dangerous, an unblocked open three becomes an unblockable four next move.
Step 2: Center control
Stones in the centre 5×5 area participate in more potential winning lines than stones on the edge. Your first few stones should be in the centre.
Opening theory: play at H8 (centre) on your first move as Black. Or near it. White responds with stones adjacent or 1 square away.
Step 3: Double threats
This is the engine of Gomoku. A double threat is two simultaneous open threes or fours; opponent can only block one. You win.
Build setups that create double threats. The classic pattern: two open lines that share one cell. When you place a stone on the shared cell, both lines have 4 — opponent loses.
Step 4: Recognize danger patterns
Train yourself to see these formations instantly: X-X-X (three in a row), X-X-_-X (broken four threat), X-_-X-X (broken four threat from the other side), X-X-X-X (four — block immediately).
All of these can turn into wins for the opponent in 1-2 moves if unblocked.
Step 5: The Renju restrictions
Tournament Gomoku uses Renju rules to handicap Black (who has the proven first-move advantage). Black cannot make: double-three (two simultaneous open threes from one move), double-four (two open fours), or overline (six in a row).
Most browser Gomoku doesn’t enforce Renju. Play casually first; learn Renju later if you want to compete.
Step 6: Endgame counting
In the last 20-30 moves, the board has lots of stones. Count threats. The player with more open threes will probably win unless their opponent has a defensive counter.
Always identify ALL of your live (open) threes and fours before each move. Same for opponent. The move that maximizes your threats while minimizing theirs is usually correct.
Practice
Play our Gomoku on Medium difficulty. Our AI uses pattern scoring and threat detection. Beat it consistently to validate your understanding.
