Gomoku Strategy: How to Build Threats and Win at Five-in-a-Row

Think in threats, not single stones

A useful Gomoku move rarely just adds one stone toward five. It creates a threat: a shape that will win next turn unless your opponent responds. If every move forces a reply, you keep the initiative and your opponent only ever defends.

These tips assume Paofuqi's freestyle rules: five or more in a row wins, and there are no forbidden moves, so every threat shape described here is legal for both players.

Open lines vs blocked lines

The strength of a row depends on its open ends. An open three is three in a row with empty points on both ends; left alone it becomes an open four and then five, so it usually must be answered. A four is four in a row with at least one open end and threatens to win immediately.

An open four—four in a row with both ends empty—has two separate winning points. A single block cannot stop it, so an open four normally wins on the spot.

• Open three: strong, usually forces a reply.
• Blocked three: weak, often safe to ignore for one move.
• Four (one open end): must be blocked now or you lose next turn.
• Open four (both ends open): two winning points—effectively unstoppable.

The double threat is how games are won

Because a single four can be blocked, you win by making two threats with one move so your opponent can only answer one. The classic finishers are a double four, a four combined with an open three (a "four-three"), and a double open three.

In freestyle Gomoku these double threats are all legal, which is exactly why the first player has an advantage. (Renju forbids some of them for Black; Paofuqi does not, so both players may use them.)

• Double four: two separate four-threats at once—your opponent blocks one, you complete the other.
• Four-three: a four plus an open three; blocking the four lets the three become an open four.
• Double three: two open threes from one stone, often a winning setup if both can grow freely.

Attack, but block in time

Initiative is valuable, but a missed defensive move loses instantly. On each turn, first check whether your opponent has a four (block it) or an open three or double threat (answer it). Only when you are safe should you continue your own attack.

A common trap is racing to build your own line while ignoring an opponent's open four. If both sides have threats, count who completes five first—tempo decides the game.

Use the opening to stay flexible

The first player normally starts near the centre, where stones have the most room to form lines in every direction. Early on, prefer moves that could grow into several different threats rather than committing to one obvious line your opponent can simply block.

Because Paofuqi decides the first move by dice in online games, practise both roles: pressing the attack when you move first, and defending accurately when you move second.

Common beginner mistakes

• Chasing your own line while ignoring the opponent's four.
• Blocking a harmless blocked three and losing a tempo.
• Building a single long line that is easy to block at one end.
• Forgetting that, in freestyle, an overline of six or more also wins.
• Defending the wrong end of an open three, turning it into an open four.

A simple way to practise

Play slowly at first. After each opponent move, name every point where either side could make five next turn, then choose a move that either removes their best threat or creates two of your own. Reviewing positions this way builds pattern recognition faster than memorising openings.

The computer opponent and local two-player mode are good for trying these ideas without pressure before you take them online.

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