Gomoku Openings: Black's First Stone and the First-Move Advantage
Black moves first and, under freestyle rules, black wins with perfect play. That is tempo, not magic. Here is which shapes to claim in the gomoku opening, how white answers, and a ten-move routine you can rehearse.
Gomoku opening theory starts with a fact players dislike: black moves first, and under freestyle rules black wins with perfect play. That is why the first ten stones decide more of the result than the thirty after them. A gomoku opening is not a memorised script the way a chess opening is. It is a small set of shapes plus one judgement: who is attacking right now. Every shape below can be tried on the play page without signing up.
Where the first-move advantage comes from
Computer search settled it: with no forbidden moves, the first player has a forced win. Competitive play switched to Renju rules for exactly that reason, restricting black with forbidden double threes and double fours. The advantage itself is not mystical, it is tempo. Black always has one more stone on the board than white, and in a game where five in a row ends everything on the spot, one spare tempo is one threat the opponent cannot answer. The practical reading is direct: black should spend the early moves building two directions at once, and white should spend them making sure black cannot.
The shapes that decide an opening
- Open two: two stones in a line with both ends empty, the basic unit of every attack.
- Live three: three in a line with both ends open, one move away from an open four that cannot be defended.
- Crossing point: the empty square where two of your extension lines meet. Claiming it early is what turns two quiet stones into a double threat.
- Diagonal shapes: opponents scan straight lines first, so a shape built on a diagonal is the one that gets missed.
Named openings, and what they actually prove
Renju players label openings. Direct openings place black's second stone on the same line as the first; indirect openings place it off-line. Patterns carry names such as Huayue, Puyue and Yinyue, and several of them have been solved as forced black wins. You do not need the names to play well. Worth taking from them is the reason they were catalogued at all: enough named openings are proven black wins that the ruleset had to change. To confirm which ruleset a match uses, the gomoku rules page lists the forbidden-move set.
How white plays the first ten moves
- Do not mirror blindly. Copying black holds up until black builds a shape that uses the centre square, then it falls apart.
- Keep your own open two alive. White wins by having a threat left in hand when black runs out of forcing moves.
- Block the crossing point rather than the existing shape. Blocking a live three delays it; occupying the intersection removes it.
- Accept a slightly worse position over a lost tempo. Gomoku has no material count, only tempo.
A ten-move routine to rehearse
- Moves 1 to 3: take the centre or a square beside it, keep every stone connected, do not scatter stones across the board.
- Moves 4 to 6: build a second open two in a direction different from the first.
- Moves 7 to 10: find the crossing point of your two lines before extending either of them.
- After the game: replay the first ten moves and mark the move where the crossing point first became available. That one habit improves openings faster than reading theory.
FAQ
Does black always win in gomoku?
Under freestyle rules, yes in theory, and computer search has shown it. Under Renju forbidden-move rules the game is balanced. Check which ruleset a match uses before you start.
What is the best gomoku opening for a beginner?
Play at or beside the centre and keep your stones connected. A diagonal open two usually survives longer than a straight one, because opponents read straight lines first.
Should I memorise named openings?
Not at the start. Learn the four shapes first, then the habit of hunting crossing points. Names become useful once you are playing people who know them.
How do I practise openings on my own?
Set yourself a time limit, play the browser AI, and review the first ten moves after each game. The engine on the play page runs locally, so there is no queue.
Openings, tempo and the swap rule only become obvious once you have lost a few games to them. Open a live game with no sign-up; the AI in your browser keeps producing opening shapes worth judging. The basics sit on the how to play page, and what comes after the opening is covered in Defense First.
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