Gokyo Shumyo, Section 4, Problem 90 / Attempts

White wins?  

Does this work?

White wins?  

Not enough liberties for Black.

White wins?  

Same here.

White wins?  

And from this side too.

White wins?  

Hanging connection fails. (And the other one too, in the same way.)

tapir: More general: two hane usually equal one liberty, but you have to leave them alone and don't take the gained liberty yourself.

White wins?  

And this, and other initial responses by Black, don't stand a chance.

Skylancer (3k)

White doesn't win?  

xela: What about this?

Ko  

unkx80: No attempt from me because I seen this problem before.

From what I remember, the clamp at here should result in a ko which White takes first. But this is not the solution.