Rectangular Eight In The Corner
Table of contents |
1. No outside liberties
This position is hyperactive. Its value and play depends upon the ko threat situation. If White is komaster she can often make seki with sente.
is the strongest attack.
is the point to avoid ko.
is necessary or White plays there (or to the right of it) to capture the corner.
If here,
makes a ten thousand year ko. This result is generally worse for Black than a seki.
in this variation invites a seki. Without
either player can make a throw-in ko.
2. Outside liberties
Now works. The throw in at
and
are oiotoshi. (If there were no outside liberty,
would be self-atari.)
Conclusion for the endgame
threatens to destroy seven points in sente.
makes seven points in reverse sente. So,
is a typical ko-threat - but it is a bad one. In case of a ko the previous diagram supplies four ko-threats: that's one more than here.
See also