Puzzle no. 12 Solution

Black to play – this game ended in a draw, could you do better?

Black wins with the following beautiful combination

1. —–   Nh4+
2. Kh2 ( if  Kf1  Qd1 and if  Kg1  Rc1, Rf1 Qg2 )  Qg2
3. Rxg2  Nf3+
4. Kh1    Rc1
5. Rg1    Rxg1 mate