Marcelo Reides & Mario Garcia (Аrgentina)  
#17 7+9

1.Rh4! 1.Rh5? Qxh1 2.Rf5 Ke1 3.Bg4+ Kd2 4.Rxh1 Rg1   1...Qxh1! 1...Be1?? 2.Rf4+! mate in fewer moves than the stipulation (1)   2.Rf4 Ke1 3.Bg4+ Kd2 4.Ra2+ Kd3! 4...Ke3?? 5.Rf3+ similar to (1)   5.Bf5+! Try: 5.Be2+? Ke3 6.Rf3+ Ke4 7.Nc3+ Ke5! and mate is produced in 19 movements (but no! 7...Kd4? e.g. 8.Ra4+ Kc5 9.Rc4+ Kxd6 10.Rd3+ Bd4 11.Rdxd4+ Ke6 12.Bg4+ etc and mate in 17 moves 12...Kf6 13.Rd6+ Ke5 14.Rd5+ Kf6 15.Bxd7 Qe1 16.Rc6+ Qe6 17.Rxe6#)   5...Ke3 6.Re4+ Kf3 7.Ra3+ Be3 8.Raxe3+! 8.Nd4+? Kf2 9.Ra2+ Kf1!   8...Kf2 9.Re2+ Kg1 10.Re1+ Kf2 11.R4e2+! 11.Rxh1? Rg1!   11...Kf3 12.Nd4+ Kf4 13.Re4+ Kg5 14.Rg4+ Kh6 14...Kf6?? 15.Rg6# 14...Kh5 15.Nf3 similar to solution   15.Nf3 g5 16.Re7 Qa1 17.Rh7#