External and Internal Ko

    Keywords: Theory

Preliminary Definitions

The locale of a ko is the set of its and its adjacent intersections.

For a ko, a closed killer is a closed player who moving first can virtual-force uncapturable life of his on the ko.

For a ko, a strong killer is a closed player who moving first can virtual-force uncapturable life of his on the locale.

Definitions of Ko Types

A ko is external if a closed killer exists that is not a strong killer.

A ko is internal unless it is external.

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