1.1.Nf8+ Kh6 2.Qh7+ Kg5 3.Rf5+ Kh4 4.Qxh5#

2.1.Nf7+ Kg8 2.Nh6+ Kh8 3.Qg8+ Rxg8 4.Nf7#

3.1.Qd5 Re6 (1...Kh8 2.Bg7+ Kg8 3.Re7#) 2.Qxe6 Kh8 3.Bg7 Kg8 4.Re7#

4.1.Bxg6+ Ke7 2.Bg5+ Nf6 3.exf6+ Kd7 4.Ne5#

5.1.Qe6+ Kg6 2.Be4+ Nf5 (2...Kh5 or 2...Kh6 allow 3.Qh3#) 3.Qxf5+ Kf7 4.Qe6#

6.1.Qd6+ Ke3 2.Qf4+ Ke2 (2...Kxd3 3.Rd1+ and 4.Qd2#) 3.Rf2+ Ke1 4.Qd2#

7.1.Rd8+ Qxd8 2.Qa4+ Qa5 3.Qxa5+ Ba6 4.Qxa6#

8.1.Qxe7+ Kg8 2.Qe8+ Kh7 3.Bd3+ g6 4.Qxh8#

9.1.Bxf4+ Kc5 2.b4+ Kxb4 3.Rd4+ Kxc3 (3...Kc5 4.Rc4#; 3...Ka5 or 3...Ka3, 4.Ra4#) 4.Rc4#

10.1.Qd7+ Kb8 2.c7+ Kb7 (2...Ka8 3.c8=Q+ Rb8 4.Qdb7#) 3.c8=Q+ Kb6 4.Qdc7#

11.1.Ne7+!! Bxe7 2.Rb8+ Rxb8 3.Qa6+ Rb7 4.Qxb7#

12.1.Qxh6+ Bxh6 2.Rh8+ Kg8 3.Nf6+ Kf8 4.Rf7#