Gomoku Shapes Explained: Live Three, Four, Double Three
Live three, four, open four, double three, double four: this is the attacking and defending language of Gomoku. Read shapes and you can see what both sides are threatening.
The rules take one sentence, so why does someone always win? The difference is shapes, the geometry between the stones. Once you learn to read the board in shapes, Gomoku stops being a connect-the-dots game and becomes a conversation of attack and defense. Feel it on a free match at yiboardgame.com.
What a live three is
A live three is a line of three with both ends open, so one more stone makes a live four the opponent cannot block on both sides. The live three is the core of attack because it forces a reply. A broken three has only one open end and is far less threatening.
Four and open four
A four is a line of four that becomes five with one stone but has only one open end; the opponent must block that one gap or lose. An open four has both ends open and is unstoppable. So making an open four is the most direct path to a win, and a chain of fours, VCF, is the advanced way to drive the opponent to defeat.
- Live three: both ends open, forces a reply
- Four: one open end, opponent must block
- Open four: both ends open, wins
- Double three or double four: two threats at once, opponent blocks only one
Defense is shapes too
On defense you are not just picking where to block, but whether your block still lets the opponent build a live three. Good defense weakens their shape while keeping your own options. For opening ideas see the openings guide.
FAQ
What is the difference between a live and broken three?
A live three has both ends open and becomes a live four next move; a broken three develops on one end only and is weaker.
Why is an open four unstoppable?
Both ends can become five, and the opponent places only one stone, so blocking one end leaves the other.
What is VCF?
Victory by Continuous Fours: a run of fours that pushes the opponent step by step until five connects.