After the last problem which was very hard I'm bringing you another one which is easier than the previous one. The position is:
[fen "K4R2/RQ4B1/2n5/3q2p1/4PP1p/3p4/pp6/1kr5 w - - 0 1"]
White has just played Qg2 and it's going to lose very quickly. What is the winning move for Black in this position?
This problem is taken again from the Chess Tactics Server.