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I must be blind. Another pair of eyes, please? [#169]

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LukeNine45: I must be blind. Another pair of eyes, please? (2005-11-17 19:22) [#508]

Korean Problem Academy, level 3, problem 70.

[Diagram]
Black to kill  

The correct answer is at a, but I can't for the life of me see why b fails. I count the same number of ko threats from each. Why is b wrong? Can white get a ko? How?

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antere: Transposition? (2005-11-17 20:11) [#509]

Doesn't b transpose to a? And I don't see any possible way to get a ko. The shapes don't look ko-ish to me. Maybe the book didn't mention b because it transposes.

[Diagram]
b  
[Diagram]
a  
X
LukeNine45: Re: Transposition? (2005-11-17 20:41) [#510]

That's what I get, too.

 
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