Eyes

Eyes are internal liberties of a group of stones that, like external liberties, prevent the group's capture, but unlike external liberties are much harder for an opponent to fill. The presence or absence of eyes in a group determine life or death of that group. A group with no eyes, or only one eye, will die unless its owner can develop them. Conversely, a group with two eyes or more will live. There is nothing an opponent can do to capture such a group, because it is impossible to remove all liberties of the group by playing one stone, thus any such play is a "suicide".

its external

Eyes are counted as occupied territory of the group that fully contains the eye. There are cases where a group may share one or more eyes with one of the opposing player's groups. These eyes do not count as territory for either player; sometimes these eyes are reduced to dame as the board changes in other areas to give one or both groups additional eyes, allowing one or both players to fill these shared eyes, but sometimes they cannot resolve (see seki below).

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