Beginner Exercise 186 / Solution

Solution  

White cuts with and .

All other moves fail, as seen in the failure diagrams. The key is to avoid double-atari.

Failure (i)  

--- fails in the same way, as does -----.

Failure (ii)  

is double-atari.

failure (iii)  

doesn't work. Black connects like this.

Failure (iv)  

Solidifying the right is too slow.