Tournament Practice Mode
Korea is a dominant force in international Gomoku. Practice with Korean freestyle rules: 15×15 board, no forbidden moves — Black or White wins with 5+ in a row.
The 한국 오목 선수권대회 (Korean Gomoku Championship) follows Korea's traditional Omok (오목) competitive tradition. Below are the core rules used in the championship, 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 or more stones horizontally, vertically, or diagonally wins. Both Black and White can win with five or more in a row — there are no forbidden moves for either color.
Korean competitive Omok traditionally uses freestyle rules. There are no 三三 (double three), 四四 (double four), or 長連 (overline) restrictions for Black — this is the key difference from Renju/Chinese rules. Black may win with six or more in a row, and any double-three or double-four pattern is legal. The game is decided purely by forming 5+ in a row.
If the entire board fills up without either player forming five in a row, the game is a draw.
Note on opening rules: Korean competitive Omok uses freestyle rules as its core — no forbidden moves for either color. Some Korean tournaments may adopt Swap2 or other opening balancing mechanisms to mitigate Black's first-move advantage, but the underlying rule set remains freestyle. On this practice board, the rule set is locked to "Freestyle (Korean Rules)".
The 한국 오목 선수권대회 (Korean Gomoku Championship) is Korea's premier Gomoku competition. Omok (오목) is hugely popular in Korea — played in schools, parks, and online — and Korea has long been a dominant force in international Gomoku, with Korean players winning multiple world championships.
Korean players have consistently ranked among the world's best, capturing titles at the World Gomoku Team Championship and other international tournaments. The depth of Korea's Gomoku culture — from casual 오목 play to elite competition — has produced a generation of players renowned for sharp tactical vision and aggressive attacking style.
Korean competitive Omok is defined by its freestyle tradition: no forbidden moves, with both Black and White able to win by forming five or more in a row. This contrasts with Japanese Renju and Chinese national rules, which restrict Black with 三三, 四四, and 长连 prohibitions. The freestyle approach keeps the game direct and attack-oriented, rewarding aggressive, fast-paced play.
No. Korean competitive Omok uses freestyle rules — there are no forbidden moves for either Black or White. The 三三 (double three), 四四 (double four), and 長連 (overline) restrictions used in Japanese Renju and Chinese national rules do not apply in Korean tournament play.
Yes. Under Korean freestyle rules, Black wins with five or more consecutive stones — six (overline) or more counts as a win, not a foul. White can also win with five or more. There is no upper limit; the first to reach 5+ in a row wins.
The key difference is the forbidden-move system. Renju (and the Chinese national rules) forbid Black from making double threes (三三), double fours (四四), and overlines (长连) to balance Black's first-move advantage. Korean Omok has none of these restrictions — both colors play freely, and any 5+ in a row wins.
Some Korean tournaments use opening balancing mechanisms such as Swap2 — where one player places three opening stones and the other chooses which color to play — to mitigate Black's advantage. However, the core rule set remains freestyle: no forbidden moves apply during the rest of the game.
It's a different style. Freestyle Korean Omok is faster and more attack-oriented, since there are no forbidden-move restrictions to slow Black down. Games often feature sharp tactical combinations and double attacks. Renju rewards deeper positional understanding of forbidden-move patterns. Both demand strong reading ability.