Igo Hatsuyo Ron Problem 138/Attempts

[Diagram]

Black to play

LukeNine45: Not sure if trading B7 for W8 is necessary. Other W2's are possible but I'm pretty sure they lead to the same position or a worse one for white.


[Diagram]

Continuation

LukeNine45: Black makes a ko with B1. Other moves let white get too many liberties (e.g. below).

[Diagram]

Failing continuation


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