Kyu Exercise 105 / Solution

Solution  

is the killing move. It makes miai of a and b.

Solution  

If protects the cutting point, then kills by almost filling the eye to a bulky five dead shape.

Solution  

If prevents White from forming a bulky five, then cuts and kills. This is because when White continues to fill up the exterior liberties, Black will need to go back and capture the three White stones, eventually becoming a bent three dead shape.