2020.8.7.愚公移山(
8.Qf7+ Re6 9.Qd8+ Rd6 10.Qb7+ Rc6 11.Qa5+ Rc5 12.Qb3+ Rc4 13.Qd2+ Rd4 14.Qf3+ e4 15.Qg5+ Re5 16.Qf7+ Re6 17.Qd8+ Rd6 18.Qb7+ Rc6 19.Qa5+ Rc5 20.Qb3+ Rc4 21.Qd2#
Theory: pawn only has three squares and can't move back or horizontal
8.Qf7+ Re6 9.Qd8+ Rd6 10.Qb7+ Rc6 11.Qa5+ Rc5 12.Qb3+ Rc4 13.Qd2+ Rd4 14.Qf3+ e4 15.Qg5+ Re5 16.Qf7+ Re6 17.Qd8+ Rd6 18.Qb7+ Rc6 19.Qa5+ Rc5 20.Qb3+ Rc4 21.Qd2#
Theory: pawn only has three squares and can't move back or horizontal