BQM 418

Semeai  

kb: At first glance, I see it as a seki, because it is too risky for Black to try and kill the White stones.

Semeai  

Black should take a liberty with and let White fill the ko at , turning the entire position into seki.

Black fail  

If Black tries to play the ko by making a threat, say at , then White will play at , turning the entire situation into a direct ko with White taking first through the sequence to , because of the local ko threat White has at . White will then ignore any ko threat Black plays and take with .

Black dies ( at )  

If Black omits the exchange at on the second diagram and just takes outside liberties, White will take at and then play regardless of where Black plays and then play to live (Black cannot play there because of damezumari.

White dies ( at , at )  

If White does not fill at on the second diagram, then White will die by double ko (after White fills at then Black will play at a to kill White).