Best Gomoku First Move: Why the Center Wins

The best first move in gomoku is the center of the board. Not "usually" or "in most situations" — it's always the center. On a standard 15×15 board, that's the intersection at row 8, column 8 (counting from the top-left). Go players call this point tengen (天元), and the reasoning for playing it first is straightforward once you see the math behind it.

Reason 1: Four Directions vs. Three

A gomoku line can run in 4 directions: horizontal, vertical, diagonal ↘, and diagonal ↙. From the center, your stone can contribute to a line in all 4 directions. From a corner, you can only build in 3 directions — one entire diagonal is cut off by the edge of the board. That's a 25% reduction in potential before you've even placed your second stone.

Edge positions are even worse. A stone on the edge of the board (row 1, column 8, for example) loses one entire half-plane. You can only build a line to one side horizontally, and one diagonal direction is gone entirely. A corner stone has only 3 working directions. An edge stone has some directions with full reach and others with half. A center stone? Full reach in all 4. The math is simple: the more directions available, the more valuable the position.

Reason 2: Room to Extend

To make 5 in a row starting from your first stone, you need 4 more stones in a line. From the center of a 15×15 board, you have 7 intersections of space in every direction. That's more than enough room to build a complete line of 5 without hitting the edge of the board — in fact, you have room for a line of 15 from end to end, plenty of flexibility for where within that line your 5-in-a-row ends up forming.

From a corner? You have 0 intersections in two directions. Even if you start at (1,1) and build along the only available diagonal, you have 14 intersections total — barely enough for one line going in one direction. An opponent who blocks one end of your corner line has effectively killed it, because there's no room to reroute. Your line is pinned to the corner, and corners are dead ends.

This spatial constraint compounds as the game progresses. A center stone supports future stones placed in any of the 4 directions around it. A corner stone only supports stones placed along the corner's available lines. Every stone you place that can't interact with your first stone is a stone you've essentially wasted — and in gomoku, wasted stones are how you lose.

Reason 3: The Proof

Victor Allis's 1993 proof that Black can force a win didn't just prove that Black wins — it proved that Black's winning strategy requires controlling the center. The proof uses threat-space search to show that a central first move gives Black the spatial flexibility needed to create double threats (positions where Black threatens to complete a line in two different ways simultaneously). White can block one, but not both. Without that central flexibility, the proof's strategy tree collapses — the winning lines no longer work.

In other words, it's not just that the center is a good first move by heuristic — it's that the center is the only first move from which a provable winning strategy exists. Every other first move either doesn't have a known winning continuation, or has been shown to be weaker. The center isn't just the best choice; mathematically, it's the only choice that's been proven to work. Read more about the proof →

What If Your Opponent Doesn't Play Center?

Take it. Seriously — if your opponent opens anywhere other than the center, just place your stone at (8,8). You've now gained the positional advantage for free. This happens surprisingly often with beginners, who tend to open near the edge or in a corner because it "feels safer" or "gives them a corner to work from." It's not safer — it's weaker. They've given you the most valuable intersection on the board without a fight.

Against an experienced player, you'll never get this chance. The center is such an automatic first move in competitive play that it's not even debated — the interesting decisions start with the second and third moves. In professional Renju, the second stone's placement determines which of the 26 designated openings the game will follow, and that choice shapes the rest of the game.

What White Should Do After a Center Opening

If you're White (the second player), your response to a center opening determines the entire character of the game. Here are the principles, ranked by how often strong players follow them:

• Play 1–2 intersections away with a diagonal offset. The strongest White responses are at positions like I9 or G7 (diagonal to center). This establishes your own presence near the center while creating the foundation for your own lines. In professional Renju, this placement determines which of the 26 designated opening patterns the game will follow. This is the standard, principled response.
• Don't play adjacent to Black's stone. Placing right next to Black's center (at H9 or I8) gives Black information about your intended direction while being easy to work around. You've essentially helped Black narrow down the board and told them where you're heading — without getting anything in return.
• Don't play on the opposite side of the board. A stone far from the center can't interact with Black's stone in any meaningful way. You need to contest the center area because that's where the game will be decided. A distant stone is a wasted move.

The First 3 Moves of a Typical Game

Here's what a solid opening looks like on a 15×15 board, with the reasoning behind each move:

1. Black plays center (H8). Standard. Always. The center gives maximum directional reach and is the only provably correct first move.
2. White plays I9 or G7. Diagonal offset, 1–2 spaces from center. This is called an "indirect opening" in Renju terminology. If White plays at I8 or H9 instead (directly adjacent), it's a "direct opening" — more aggressive but also more committal, because White is showing their intended direction early. The indirect opening is more flexible and more common at the top level.
3. Black plays to establish a second direction. The key insight: Black's third stone should not be in the same line as the first two. If Black's first stone is at H8 and White is at I9, Black might play at G7 — creating presence in a different diagonal while staying near the center. The goal is to have stones that can support multiple potential lines, not just one. A player who puts all their stones in a single line is easy to block.

After these 3 moves, the game opens up. Both players have a foothold near the center, and the real tactical battle begins — blocking threats, creating double threats, and fighting for positional dominance. This is where gomoku stops looking like "big tic-tac-toe" and starts becoming the game that has world championships. See the beginner strategy guide for what to do next →

What About on Smaller Boards?

The center-first principle holds on 9×9 and 13×13 boards too. On a 9×9 board, the center is (5,5). On a 13×13 board, it's (7,7). The reasoning is identical: maximum directional freedom and maximum extension room. If anything, the center matters more on smaller boards because there's less room overall — wasting a move on an edge position costs you proportionally more space. On a 9×9 board, a corner stone gives you access to only 8 squares in the useful directions, compared to 32 from the center. The difference is enormous on a small board.

If you're learning gomoku on a 9×9 board (a great starting point), practice the center opening until it's automatic. You should never have to think about where your first stone goes. Save your mental energy for move 2 onwards — that's where the real decisions start.

The Swap Rule in Competitive Play

The center opening is so strong for Black that competitive gomoku uses the swap rule (also called the "pie rule" or "swap2") to keep things fair. In simple terms: after the first few moves, the second player can choose to swap colors with the first player. If Black's opening is too strong, White just... becomes Black. This Creates an interesting dilemma — if you play an overly greedy opening, your opponent will swap and take it from you. If you play too conservatively, you waste Black's first-move advantage. The swap rule effectively forces Black to find an opening that's roughly balanced, which is part of what makes competitive gomoku interesting despite the theoretical first-player advantage.

What Not to Do on Move 1

Just to be thorough, here are common first-move mistakes and why they fail:

• Opening in the corner. You've given up 25% of your directional reach and limited all your lines to one direction. A skilled opponent will take the center and use its flexibility to outmaneuver you.
• Opening on the edge. Same problem as the corner but slightly less severe — you've lost one direction instead of two. Still a bad trade.
• Opening one step off-center. This is the most subtle mistake. Playing at (8,7) or (7,8) — one step from center — sacrifices a small amount of directional symmetry. It's not terrible, but there's no upside. The true center gives you strictly more options. There's no strategic reason to play one step off the optimal square.

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