Chess Puzzle

Here is today's puzzle:


Can Black still win? Yes: Black found the one move which secures the full point for him. Can you?

Solution to last puzzle:
A.A. Ponelis - B. Kerr
Inter-Union Congress, Randburg 1978
White played 1.Rh3+! and Black resigned because of 1...Kxh3 2.Qf3+ Kh4 3.Qg3 mates.