Japanese Rules

  Difficulty: Beginner   Keywords: Rules

Japanese rules are the rules used in Japan. Japan had no written rules until 1949. They were revised in 1989. The new rules are rather different from the old rules, but have the same effect for nearly all games. Other parts of the world have often also adopted such rules. Korean rules are particularly similar. Furthermore, sets of rules similar to those used in Japan are often casually referred to as Japanese (style) rules.

Under Japanese rules:

Table of contents

Official Rule Sets


Other Japanese Style Rule Sets

See also


Summary and commentary

  • Specific features:
    • Group status cannot be determined by resuming play, due to the fact that this would alter the score and possibly the result of the game.
    • While a special procedure for determining life and death exists, decision by a referee may be required in amateur play to decide whether a group is alive.
  • Scoring method: Territory
  • Counting method: Japanese
  • Superko: No (a game with a repeating position is declared to be without result and repeated)
  • Komi: 6.5
  • Suicide: Forbidden
  • Points in seki: Do not count
  • Cost of moving in one's territory: 1 point
  • Life and death settled by: Hypothetical play with special ko rules
    • Ko threats do not count when determining life and death.
  • Illegal move: Forfeits the game
  • [ext] Full text in English
  • Used in: Japan
    • Also used in most of Europe, with the difference that an illegal move is taken back and a repeating position is a draw.

Japanese Rules last edited by fool on February 15, 2023 - 01:40
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