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Cutting seki
Karl Knechtel: Surely I am not first to discover such things...
The marked stones are alive in seki assuming that the unmarked stones cannot be captured. A play at either a by either player is answered at the other a.
The same situation arises with longer chains of cutting stones, and/or more space inside (as long as neither player can win the semeai by making an eye or by some other tesuji).
A single cutting stone does not suffice for seki; this is a snapback and Black is dead.
Well, two stones sometimes neither: nine dead black stones. (Just was up calling it double snapback, but it seems that's something different. Two-stage snapback?)
Just for the amusement value. All inside stones are alive in seki. Without the marked white stone, all black stones would be dead (white could first capture the inside group because of having an eye in the belly?; then the seki is destroyed for the outside groups). For even more amusement value, see Maximum Number Of Live Groups. This is a copy of the living page "Cutting seki" at Sensei's Library. ![]() |