Renju Board vs Go Board: What Is Actually Different?

Put a renju board and a Go board side by side in a photograph and most people cannot tell them apart. Both are wooden slabs covered in a dark grid, both come with two bowls of smooth round stones. Play on them for ten minutes and the difference is obvious.

Here is what actually changes, and what it means when you are deciding which one to buy.

The short answer

A renju board is a 15×15 grid and is the standard board for gomoku and renju alike. A Go board is normally 19×19. A Go board can play renju — you simply use the inner fifteen lines and leave the outside empty. A renju board cannot play Go, because Go needs the full nineteen lines. If you want one board for both games, buy the Go board.

Grid size: 225 points against 361

This is the difference everything else follows from. 15×15 gives 225 intersections; 19×19 gives 361. In gomoku, the size of the board is tuned to the length of the win condition: five in a row on 225 points is a game with real depth but a game you can finish in ten minutes. On 361 points, five in a row becomes noticeably harder to force, which is why Go treats territory rather than lines as its objective.

The practical consequence for buying: the extra 136 points on a Go board are not a problem for gomoku. They are simply unused margin. The reverse is not true. On a 15×15 board, a Go game is cut off from more than a third of the space it needs, and the strategic layer collapses.

Star points: five dots against nine

Both boards mark reference points with small dots, and this is the fastest way to tell them apart from across a room.

A 15×15 renju board normally carries five star points: one at the centre and one at each corner group — the marker on the centre intersection exists specifically because the first stone of a gomoku game goes there.

A 19×19 Go board carries nine: a centre point, four at the corners, and four along the edges. They exist to give Go players a coordinate frame for handicap stones.

Neither set of dots affects play legally. But the count is a reliable tell. A "gomoku board" advertised with nine star points is a Go board with a marketing label, and the centre point it is missing is the one the game actually cares about.

Line thickness and spacing

Renju boards are drawn to play five-in-a-row, which rewards a dense, evenly weighted grid: the lines are slightly thicker relative to the spacing, and because there are fewer of them, each individual intersection is a larger fraction of the whole board. The board reads as busier and more symmetrical.

Go boards use finer lines and wider spacing, partly because Go positions are read in large shapes rather than in local lines. This difference is subtle in a product photo and immediately obvious in use. It also matters at the edges: on a Go board, stones near the boundary sit in a noticeably emptier field, which is what gives gomoku its slightly quieter feel there.

Stones and the fit problem

Stones are where people expect a difference and where there mostly is not one. A standard Go stone is about 22mm across; gomoku is played with the same stones on the same grid spacing on a 15×15 board, so the stones are interchangeable in practice.

The one caveat is a genuine mismatch: some cheap 15×15 boards have a tighter grid than they should, and standard stones crowd each other visually. If a board's grid spacing looks cramped in the listing photos, it is a sign the manufacturer scaled a Go board down rather than building a renju board. On a correct 15×15 board, the stones sit with clear air between them.

Can a Go board play renju?

Yes, and it is a common arrangement among players who own one board and both games. You play on the inner 15×15 grid. Two adjustments are worth knowing about. First, the board edges are further away, so a rush to the outer parts of the grid is subtly less attractive and games tend to develop more slowly through the centre. Second, your coordinate labels will not match renju notation, so if you are studying renju theory you will be translating positions in your head.

Neither is a serious obstacle for casual play. For anyone intending to record games or work through opening books, the 15×15 board is the right tool.

What to actually buy

Three products cover the whole decision, and the stones are the same in every case — only the board changes.

Which one is right for you

Buy the 15×15 if you are playing gomoku or renju, you want the board the game was designed for, and you like the idea of recording or studying games. It is also the smaller table footprint, which matters more than people expect.

Buy the 19×19 if anyone at home plays Go, or if you want the widest possible range of games from one purchase. The inner grid plays gomoku and renju without modification.

Buy both eventually if you get serious about renju, because opening theory assumes the 15×15 coordinates and translating moves by hand is tedious enough that people stop doing it.

The bottom line

Same grid, same stones, different board size — and only one direction of compatibility. A Go board plays renju. A renju board does not play Go. If you have to choose a single board and you are not yet committed to tournament renju, the 19×19 is the more flexible purchase; if gomoku is the whole point, the standard 15×15 is the correct one.