Rules of the Game
Classic Gomoku
- Board: Usually a 15×15 grid (sometimes 19×19).
- Players: One uses X (or black stones), the other O (or white stones).
- Turns: Players alternate placing their mark on an empty cell.
- Objective: The first player to get an unbroken row of five of their marks (horizontally, vertically, or diagonally) wins.
- In casual play, getting more than 5 in a row also counts as a win.
Renju (Tournament Rules)
To balance the game, tournament play (Renju) adds restrictions for the first player (Black):
- Forbidden to create a "double-three" or "double-four" (two open-ended rows of 3 or 4 stones with one move).
- An "overline" (a row of six or more stones) does not count as a win for Black.
History of the Game
Gomoku, known as Wu Zi Qi in China, is an ancient abstract strategy board game. Its origins are thought to date back over 2000 years in ancient China. The game spread to Japan, where it was named Gomoku Narabe (five stones in a row) and became widely popular. In the 19th century, it was introduced to Europe, where it was often called Gobang. The modern professional version, Renju, was developed in Japan to balance the significant advantage of the first player.
Winning Strategies
- Play Proactively: Always look to create your own threats. The best defense is a good offense. If you force your opponent to block you, they can't build their own lines.
- Create Open Fours: An "open four" is a line of four of your pieces with empty spaces at both ends. This is an immediate threat that forces a win on your next turn.
- Watch for "Threes": Creating an "open three" (a line of three with open ends) is a powerful move, as it sets up a potential "open four" on your next turn. Try to create multiple threats at once.
- Block Opponent's Threats: If your opponent has an open three or a line of four, you must block it immediately. The most urgent threat is a line of four.