double ko seki

   
[Diagram]

Double Ko Seki

This is a double ko seki. If Black takes at a White takes at b, and vice versa. Then the first player to take cannot continue locally.

Under Japanese rules, this seki, like all seki, provides no points to either player.

[Diagram]

Another Double Ko Seki



Double ko seki provides an unlimited number of unremovable threats, which is a reason why some people consider that superko should be applied in most rulesets. (See also Moonshine Life)

See Double Ko, Seki.


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