- An apparent seki but at least one of the surrounding group is dead. In this case, we say that the seki has collapsed, or that the seki is false.
- A seki where the surrounding group(s) are not unconditionally alive.
- A seki where a player decides to give it up as a ko-threat (e.g. an self-atari). Since this will then be a loss-making threat of quite serious proportions, it is not very common to occur in games.
To see why this seki is false, we see that White can play , , and . Black can do nothing to prevent White from playing these moves and removing the group off the board.
With the stones taken off, it is now obvious that the remaining stones are plainly dead.
Although the and groups are currently engaged in a seki, the stones are not yet unconditionally alive. So there is always a distinct possibility that the stones get captured later in the game. (A similar comment may be made for the stones.) We say that this is a temporary seki in the second sense, and this seki may collapse.
Suppose has just taken the ko in the fight to live. Note that there is a seki in the corner.