<div class='user_solution'><span class="MsoNormal" style="text-align:justify;display:block;"><b>1.Nxe4! </b></span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>Trials </b></span> <span class="MsoNormal" style="text-align:justify;display:block;">a) 1.h7+? Kh8 2.Kg4 <i>(2.Nxe4 Bb8+! 3.Kg4 Qg2+=) </i>2...Bxd4! 3.Qxe4 Qb8=</span> <span class="MsoNormal" style="text-align:justify;display:block;">b) 1.Qf1? Qxc3+ 2.Kh4 Qf3 3.Qc4+ Kf8 4.Qc8+ Ke7 5.Qc7+ Ke8! <i>(5...Ke6? 6.d5+ Kxd5 7.Qf7++-) </i>6.Qc6+ Ke7=</span> <span class="MsoNormal" style="text-align:justify;display:block;"> </span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>1...Bb8+ 2.Kg4 Qxd4 </b></span> <span class="MsoNormal" style="text-align:justify;display:block;">2...Qg2+ 3.Ng3+-</span> <span class="MsoNormal" style="text-align:justify;display:block;"> </span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>3.h7+ Kh8 4.Kh5 Qe5+ </b></span> <span class="MsoNormal" style="text-align:justify;display:block;">4...Bg3 5.Qd2! Qe5+ 6.Ng5+-</span> <span class="MsoNormal" style="text-align:justify;display:block;"> </span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>5.Ng5! Qh2+ 6.Qh4 Qe2+ 7.Qg4 Qh2+ 8.Qh3 </b></span> <span class="MsoNormal" style="text-align:justify;display:block;">8.Nh3? Qe5+ =</span> <span class="MsoNormal" style="text-align:justify;display:block;"> </span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>8...Qe2+ 9.Qf3 </b></span> <span class="MsoNormal" style="text-align:justify;display:block;">9.Nf3? Qe8 <i>(9...Qb5+ 10.Ng5 Qe2+ </i>is loss of time<i>) </i>10.Qf5 Bf4!=</span> <span class="MsoNormal" style="text-align:justify;display:block;"> </span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>9...Qh2+ 10.Kg4 Qg1+ 11.Kh4 Qh2+ </b></span> <span class="MsoNormal" style="text-align:justify;display:block;">11...Bg3+ 12.Kh5 Qh2+ 13.Kg4 Qh4+ 14.Kf5+-</span> <span class="MsoNormal" style="text-align:justify;display:block;"> </span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>12.Qh3 Bg3+ </b></span> <span class="MsoNormal" style="text-align:justify;display:block;">12...Qf2+ 13.Kg4 Qd4+ 14.Kh5 Qd1+ 15.Qf3+-</span> <span class="MsoNormal" style="text-align:justify;display:block;"> </span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>13.Kh5 Qe2+ 14.Qg4 Qh2+ 15.Nh3 Qc2 16.Qf3 Qc8 </b></span> <span class="MsoNormal" style="text-align:justify;display:block;">16...Qc5+ 17.Ng5+-</span> <span class="MsoNormal" style="text-align:justify;display:block;"> </span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>17.Ng5+- </b></span> <p class="MsoNormal"><span style="font-size: 10pt; font-family: &quot;FigurineCB AriesSP&quot;;"> </span></p> <p class="MsoNormal"><span style="font-size: 10pt; font-family: &quot;FigurineCB AriesSP&quot;;"> </span></p> <p class="MsoNormal"><b> </b></p></div>