Worst Move Problem 8 / Solution

White to play the worst move  

xela: White can choose from a, b or c.

If white a, then the black group is unsettled (black could live by playing b).

If white b, then black is dead.

If white c, then black is unconditionally alive: a and b are miai.

If white tenuki, then the black group is still unsettled.

So this is the solution: