Late endgame exercise - Fujitsu 8 Game 9 / Solution

After White fills the dame (marked):

[Diagram]

Reinforcement is needed

Black has to play at 1 to prevent seki. Black can only avoid seki by ignoring a ko threat, which costs too much to be acceptable.

[Diagram]

If Black does not reinforce

Black can't afford to play the ko at a, and has to settle for a seki at b.


[Diagram]

Another solution?

ProtoDeuteric: Why can't black simply make two eyes by playing B1 here?

unkx80: Either way works.


This is a copy of the living page "Late endgame exercise - Fujitsu 8 Game 9 / Solution" at Sensei's Library.
(OC) 2011 the Authors, published under the OpenContent License V1.0.
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