Gomoku
Gomoku (Five in a Row) is a strategy board game for two players. Players take turns placing black and white stones on a 15×15 grid, aiming to be the first to form an unbroken line of five stones horizontally, vertically, or diagonally.
Rules
- Black goes first. Players alternate turns.
- Place one stone per turn on any empty intersection.
- The first player to form five (or more) in a row wins.
- If the board fills up with no winner, the game is a draw.
Renju Variant (Optional)
When the "Renju" variant is enabled, Black has additional restrictions to balance the first-move advantage:
- 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 (長連): Black cannot form a line of six or more stones. Only exactly five wins.
White has no such restrictions. These rules only apply to Black.
A move that creates exactly five in a row is always legal, even if it would otherwise be forbidden.