Tournament Practice Mode
Singapore is an active RIF member with a thriving Gomoku community. Practice with Singapore championship rules: 15×15 board with Black forbidden moves (三三, 四四, 長連).
The Singapore Gomoku Championship is the national Gomoku competition of Singapore, organized by the Singapore Mind Sports / Gomoku Association. Below are the core rules used in the championship's competitive groups, which this practice board enforces automatically.
Played on a 15×15 grid. One player uses black stones, the other white stones. Black always moves first.
The first player to form an unbroken line of five stones horizontally, vertically, or diagonally wins. White may also win with five or more (overline allowed for White). Black must form exactly five — six or more is a forbidden move.
To balance Black's first-move advantage, Black is forbidden from creating three patterns. If Black plays a forbidden move, Black loses immediately:
Black can only win by a 四三 (Four-Three) — one four and one three from the same move.
If the entire board fills up without either player forming five in a row, the game is a draw.
Note on local variations: Singapore follows RIF standard rules. As an RIF member nation, Singapore uses the standard 15×15 board with forbidden moves for Black. Some local school competitions may use simplified freestyle rules for younger players.
The Singapore Gomoku Championship is Singapore's premier national Gomoku competition. It is organized by the Singapore Mind Sports / Gomoku Association, an active member of the RIF (Renju International Federation). The championship brings together top local players as well as rising talent from school and community programs.
Singapore's Gomoku scene is closely tied to the broader mind-sports movement, and the game is especially popular among students and at community centers across the island. School-level competitions and inter-club events help develop new players, many of whom progress to the national championship and international representation.
As an RIF member nation, Singapore adopts the federation's standard competition rules: a 15×15 board with Black forbidden moves (三三, 四四, 長連). This keeps Singaporean players competitive in regional and world events, where the same forbidden-move system is used to balance Black's first-move advantage.
Black has three types of forbidden moves: 三三禁手 (double three) — creating two or more live threes in one move; 四四禁手 (double four) — creating two or more fours in one move; and 長連禁手 (overline) — forming six or more consecutive stones. If Black makes any of these moves, Black loses the game.
No. White has no forbidden moves. White can win with five, six, or more consecutive stones. The restrictions apply only to Black to compensate for the first-move advantage.
No. In the Singapore championship rules, Black can only win with exactly five consecutive stones. Six or more is a 長連禁手 (overline) and results in an immediate loss for Black. White, however, can win with five or more.
A 四三 (four-three) is the standard winning move for Black: a single stone that creates both a "four" (four consecutive stones with at least one open end) and a "three" (three consecutive stones with both ends open) at the same time. Since Black cannot use double-fours or double-threes, the four-three is Black's primary winning method.
Yes. As an RIF (Renju International Federation) member, Singapore follows the standard Renju forbidden-move system (三三, 四四, 長連) on a 15×15 board. This is the same core system used by other RIF member nations. Some local school competitions may use simplified freestyle rules for younger players, but the championship itself uses the standard RIF rules. On this practice board, the rule set is labeled "禁手 (Renju Rules)".