Endgame Tesuji 17

   
[Diagram]

correct

In the correct version, White has no sente follow up, if Black moves next after B1 this reduces White's corner to barely two eyes and three points or sets up a ko.

[Diagram]

correct - follow up ko

W5 at B4 lives, but this result is clearly better than the other B1.

[Diagram]

Another B1, White follow up

[Diagram]

Another B1, Black follow up


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