1.Sc2! - 2.Se3#.

1...Sd4 2.Sxd4+ Ke5 3.Sd7+ Kd5 4.Ba2#,

1...Qd4+ 2.Sxd4+ Ke5 3.Kxc6 h1Q+ 4.Sf3#,

1...Qxh4 2.Se3+ Kxg5 3.Se6+ Kh6 4.Bg7#,

1...Qd3 2.exd3 Sd4 3.Bxd4   ~  4.Se3#.