<div class='user_solution'><p class="MsoNormal"><b><span lang="EN-US">1...Rh5+! </span></b><span lang="EN-US">[1...Nf3 2.Bd2! Nxd2 3.a7=] </span></p> <p class="MsoNormal"><b><span lang="EN-US">2.Rb5 </span></b><span lang="EN-US">[2.Ka4? Rxh6 3.a7 Ra6+ 4.Kb5 Rxa7! 5.Rxa7 Nc2–+] </span></p> <p class="MsoNormal"><b><span lang="EN-US">2...Nf3! 3.Bd2! </span></b><span lang="EN-US">[3.Rxh5? e1Q+–+; 3.a7? e1Q+–+] </span></p> <p class="MsoNormal"><b><span lang="EN-US">3...Nxd2 4.a7 Nc4+ 5.Ka4 </span></b><span lang="EN-US">[5.Ka6? Rh6+–+] </span></p> <p class="MsoNormal"><b><span lang="EN-US">5...Nb6+! 6.Rxb6 Ra5+! 7.Kxa5 e1Q+ 8.Ka6 <br /></span></b></p><p class="MsoNormal"><b><span lang="EN-US"></span></b><span lang="EN-US">[8.Rb4? Qa1+! 9.Kb6 Kd7–+]</span></p> <p class="MsoNormal"><span lang="EN-US"> </span></p> <p class="MsoNormal"><b><u><span lang="EN-US">mainline A:</span></u></b><span lang="EN-US"> </span></p> <p class="MsoNormal"><b><span lang="EN-US">8...Qe2+ 9.Kb7 </span></b><span lang="EN-US">[9.Rb5? Kc7!–+] </span></p> <p class="MsoNormal"><b><span lang="EN-US">9...Qe4+ 10.Kb8 </span></b><span lang="EN-US">[10.Rc6? Kd7!–+] </span></p> <p class="MsoNormal"><b><span lang="EN-US">10...Qe5+ 11.Kb7 </span></b><span lang="EN-US">[11.Ka8? Qf5! 12.Rb8+ </span></p> <p class="MsoNormal"><i><span lang="EN-US">(12.Kb7 Qc8# </span></i><span lang="EN-US">mate with two self-blocks<i>; 12.Kb8 Qc8# </i>mate with self-block<i>) </i></span></p> <p class="MsoNormal"><span lang="EN-US">12...Kc7 13.Rb7+ Kc6 14.Rc7+! Kb6!–+ <i>(14...Kxc7? </i>stalemate<i>) </i>] </span></p> <p class="MsoNormal"><b><span lang="EN-US">11...Qd5+ </span></b><span lang="EN-US">[11...Qc7+ 12.Ka8! Qxb6 stalemate] </span></p> <p class="MsoNormal"><b><span lang="EN-US">12.Kb8 Qc5/Qd7</span></b><span lang="EN-US"> <b>13.a8N! </b>[13.Ka8? Qf5!–+ (see 11.Ka8? Qf5!)<i>(13...Qxb6? </i>stalemate<i>) </i>; 13.a8Q? Qc7# mate with self-block] </span></p> <p class="MsoNormal"><b><span lang="EN-US">13...Qc8+ 14.Ka7=</span></b></p> <p class="MsoNormal"><span lang="EN-US"> </span></p> <p class="MsoNormal"><b><u><span lang="EN-US">mainline B:</span></u></b><span lang="EN-US"> </span></p> <p class="MsoNormal"><b><span lang="EN-US">8...Qe4 9.Ka5! </span></b><span lang="EN-US">[9.Rb8+? Kc7! 10.a8Q Qa4# model mirror mate] </span></p> <p class="MsoNormal"><b><span lang="EN-US">9...Qd5+ 10.Rb5 Qa2+ 11.Kb6 Qe6+ 12.Ka5 Kc7 13.a8N+! </span></b><span lang="EN-US">[13.a8Q? Qa2+–+] </span></p> <p class="MsoNormal"><b><span lang="EN-US">13...Kc8 14.Nb6+=</span></b></p> <p class="MsoNormal"><b><span lang="EN-US"> </span></b></p> <p class="MsoNormal"><b><u><span lang="EN-US">mainline C:</span></u></b><span lang="EN-US"> </span></p> <p class="MsoNormal"><b><span lang="EN-US">8...Qf1+ 9.Kb7 </span></b><span lang="EN-US">[9.Ka5? Qa1+–+; 9.Rb5? Kc7!–+] </span></p> <p class="MsoNormal"><b><span lang="EN-US">9...Qf7+ 10.Kb8 </span></b><span lang="EN-US">[10.Ka8? Qf5!–+ (see 11.Ka8? Qf5! in the mainline A); </span></p> <p class="MsoNormal"><span lang="EN-US">10.Ka6? Qc4+! 11.Kb7 Qc8# mate with two self-blocks] </span></p> <p class="MsoNormal"><b><span lang="EN-US">10...Qc7+ 11.Ka8 Qc3 </span></b><span lang="EN-US">[11...Qxb6 stalemate] </span></p> <p class="MsoNormal"><b><span lang="EN-US">12.Rb8+ </span></b><span lang="EN-US">[12.Kb8? Qc8# mate with self-block; 12.Kb7? Qc8# mate with two self-blocks] <b>12...Kd7 13.Rb7+ </b>[13.Kb7? Qc6# echo mate with two self-blocks] </span></p> <p class="MsoNormal"><b><span lang="EN-US">13...Kd6 14.Rc7! </span></b></p> <p class="MsoNormal"><span lang="EN-US">[14.Kb8? Qh8# ideal mate with two self-blocks; 14.Rb6+? Kc5–+] </span></p> <p class="MsoNormal"><b><span lang="EN-US">14...Qxc7/Kxc7</span></b><span lang="EN-US"> stalemate</span></p> <p class="MsoNormal"><span lang="EN-US">[14...Qa5 15.Rc8=] </span></p> <p class="MsoNormal"><span lang="EN-US"> </span></p> <p class="MsoNormal"><span lang="EN-US"> </span></p></div>