<font color="#3e6617" face="Times New Roman" size="4">try: 1) Rc5? thr. 2) Qe5/Qxe7    1).., e6. 2) Qe5  1).., e5. 2) Qxe5   but   1).., Kxc5!</font><br /> <font color="#3e6617" face="Times New Roman" size="4">solution: 1) Qa5! thr. 2) Qd5    1).., e6. 2) Qc5  changed mate 1).., e5. 2) Rf6  changed mate  1).., c6. 2) Qe5   1).., c5. 2) Qb6  1).., Kc6. 2) Qa6</font><br /> <font size="4"><font color="#3e6617" face="Times New Roman">NB: 1).., Ke6. 2) Qd5/Qe5 is not a dual. as Ke6 is not a defence against 2) Qd5, therefore shouldn't be shown</font></font><br />