W1 looks interesting (i.e. necessary sooner or later), W7 at B4  
Second part  

Tapir: More exploration of a certain line, than solution. White may win the semeai, but can he defend against a? (A stone at e.g. b would.) And, I'm not sure about corner semeais (the line after W15). - White lose even the semeai like this...

Opening my eyes... isn't the task to defend against both a with one move?  
Testing the assumption  
Solution? - I  
Solution? - II (W7 at W1)  

Tapir: I hope this is the solution... but it isn't. Black can take back at the marked stone, and wins the semeai.

IgoHatsuyoRonProblem122/Attempts last edited by tapir on December 27, 2008 - 20:44
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