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BQM50
   

[Diagram]
Diag.: Status ?


We can consider this shape to be a weak L+2-group - the weakness being the absent stone at 'a'. On top of that, Black has the sagari of the marked stone in place. What would be the status of this group ?

[Diagram]
Diag.: Status ?

It takes little to realize that White can live by playing at 1 or 'a'. The question is now whether Black can kill.



[Diagram]
Diag.: From the outside

Occupying the weak spot leads nowhere. White lives easily: it looks like 2 is the VitalPoint.


[Diagram]
Diag.: Attack at 1-2

The attack at this point amounts to failure.


[Diagram]
Diag.: Attack at 2-2

After 6, it is pointless to continue with Black 'a' - White 'b'. In fact, the marked point provides the extra liberty for the group to be alive



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