How to Play
The board: A 15×15 grid of intersecting lines. Stones are placed on the intersections, not inside the squares.
The pieces: Black and white stones. Black moves first.
Players: Two, alternating turns. Once placed, a stone cannot be moved or removed.
The goal: Be the first to form an unbroken line of five stones of your color — horizontally, vertically, or diagonally.
Basic rules (freestyle / casual):
- Black places the first stone, then players alternate.
- A line of five or more wins.
- There are no restrictions on either player.
Competitive rules (Renju): Because Black’s first-move advantage is so strong that perfect play wins, competitive play adds forbidden moves for Black only:
- Double-three (三三): Black cannot place a stone that simultaneously creates two open threes.
- Double-four (四四): Black cannot place a stone that simultaneously creates two fours.
- Overline (长连): Black cannot make a line of six or more. White has no forbidden moves — White wins with five or more in a row.
Opening balance rules: Even with forbidden moves, Black retains an advantage, so professional tournaments add opening protocols such as Swap2 (the first player places three stones, two black and one white; the second player then chooses to play Black, play White, or place two more stones and pass the choice back). This forces the opening to be fair.
Basic strategy:
- Build open threes. An “open three” (a row of three with both ends unblocked) cannot be stopped — the opponent can block only one end, letting you make an open four and win.
- Watch for double threats. The most reliable wins come from creating two simultaneous threats (a double-three or a four-three) that the opponent cannot block both at once.
- Defend actively. Blocking an opponent’s open three is urgent; blocking a “closed three” can often wait.
- Control the center. Central stones radiate influence in all directions; edge stones have fewer lines of attack.
History and Origins
Five-in-a-Row is traditionally said to predate Go itself in China — legend places it in the era before Emperor Yao supposedly invented Go. The claim is folk tradition rather than documented fact, but the game’s ancient roots in China are widely accepted.
It spread to Korea and then Japan, likely around the 6th–7th century alongside Go. In Japan it flourished: by the Genroku era (1688–1704) it was popular among commoners, and in 1899 a public naming contest formally christened it “Renju” (連珠, “connected beads”), drawn from a classical phrase about stars strung like pearls. Japan also led the rule reforms — banning Black’s double-threes, double-fours, and overlines between 1899 and 1931, and standardizing the 15×15 board in 1931.
The game reached Europe in the early 20th century. The Renju International Federation (RIF) was founded in 1988, and China joined in 1996. In 2006, China’s sports authority recognized Five-in-a-Row as an official sport, and it became a medal event at the 2009 National Mind Sports Games.
