Chinese Superko
Keywords: Rules
A play may not recreate a previous board position from the game by means of basic ko or Sending two, returning one. If a cycle arises in another way and neither player varies from it, the referee may declare a draw or require a replay.
This, according to the sixth meeting of the International Go Rules Forum, is what the Chinese rules were intended to specify.
Information taken from http://www.britgo.org/rules/compare.html