version 1: Mate in 4
version 2: Mate in 3
Black makes only 3 moves right?
My fault, indeed. You are right Oran_perrett, I guess I was too excited, since it was taken from actual game in which I won, of course. :)
First version was from my game (4 moves), second from post analysis, hence the title.
Thank you!
version 1: Mate in 4
version 2: Mate in 3