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PGB111

 

PGB101
   

[Diagram]
Diag.: Position after black 101


The main issue of the position is the life of the white's group at the top. The group has one eye and a possible second one on ko. I postpone discussion of the issue of ko till the possibility appears for the first time. I think now that it was better to start fighting ko using breaking away as ko threats. As there is a lot of those the outcome would be comparatively easy escape, while black would take quite large profit.


[Diagram]
Diag.: Moves 102-111


White 1 captures the stone. It seems that white has no other option here.

Black 2 is a standard way to make the eye false. 'a' would be another possibility. White has to capture with 3.

Black 4 was too mild, leaving some space for white to make a second eye. The purpose was to confine white at the top.

White 5 jumps out threatening to connect to the stone on the left and black 6 separates the groups. White 7 tries to break out aiming at someting like a space for a second eye. Black counters with 8.

White makes an atari with 9 and black has to connect with 10 in order to keep white's eye false.


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