Quadruple Ko

  Difficulty: Expert   Keywords: Ko, Go term

Chinese: 四劫 (s ji); or 四劫循环 (s ji xn hun)
Japanese: 四コウ (yon kō)
Korean: 사패 (sa pae)

Similar to triple ko, a quadruple ko involves four kos on the board that are all in play at the same time. Often they are part of the same configuration, as in this example.

[Diagram]
An example of quadruple ko  


A double ko and two separate kos can also form a quadruple ko.

A quadruple ko may lead to a game ending in no result if neither player is willing to back down from the ko fight, though some modern rulesets handle it with the superko rule.

Examples

  • Fifteen examples of pro games ending in quadruple ko are given on [ext] Quadruple Ko.
  • In the preliminaries for the 25th Kisei, the game on April 6th 2000 between Doi Makoto and Hasegawa Sunao ended in no result due to a quadruple ko that occurred relatively early in the game. The game was replayed, with Hasegawa winning.
  • An amateur game from the 2003 Frankfurt Go Tournament (Simon Kober 16 kyu versus Bjoern Wenzlaff 18 kyu) also included a quadruple ko. A photo is on the cover of [ext] DGoZ 3/2003.
  • In the 2012 17th Samsung Cup, a quadruple ko occurred in a match between Gu Li and Lee Sedol [ext] SGF and [ext] background info.

See also:


Quadruple Ko last edited by tapir on August 24, 2014 - 16:16
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