Fighting Empty Triangle

   

Acceptable empty triangle?

[Diagram]

fighting emty triangle - white's next move?

tderz: from a Korean book, p.229 (ISBN 89-333-0346-4)
All black moves look completely natural, don't they?
Still he voluntarily created an empty triangle.
Should he have exchanged a for b first?

It's not so easy to decide on white's next move, hence the empty triangle can't be that bad and rather renamed fighting empty triangle.

 

/attempts?
/solution


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