<div class='user_solution'><span class="MsoNormal" style="text-align:justify;display:block;"><b>1.Rf8! </b></span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>Trials :</b></span> <span class="MsoNormal" style="text-align:justify;display:block;"><span> </span>a) 1.Rf6? Rg5+ 2.Kh7 Nh3 3.Kxh6 N1f2! <i>(3...Rg8? 4.Rxg4+ Rxg4 5.Ne3+ Kxh2 6.Nxg4++-) </i>4.Ne3+ Kg1 5.Rxf2 Kxf2 6.Nxg4+ Kg2=</span> <span class="MsoNormal" style="text-align:justify;display:block;">b) 1.Rf4? Rg5+ 2.Kh7 Nh3 3.Ne3+ Kxh2 4.Kxh6 <i>(4.Rfxg4 Rxg4 5.Rxg4 N3f2!=) </i>4...Kg3! <i>(4...Rg8? 5.Rfxg4 Rxg4 6.Rxg4+-) </i>5.Rhxg4+ Rxg4 6.Rxg4+ Kf3/f2=</span> <span class="MsoNormal" style="text-align:justify;display:block;"> </span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>1...Rg5+ 2.Kh7 Nh3 </b></span> <span class="MsoNormal" style="text-align:justify;display:block;">2...Nf3 3.Ne3+ Kf2 4.Nxg4+-</span> <span class="MsoNormal" style="text-align:justify;display:block;"> </span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>3.Ne3+ </b></span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>Try :</b> 3.Kxh6? N1f2! 4.Ne3+ Kg1 5.Rh5 Rxh5+ 6.Kxh5 Kxh2 7.Kh4 Kg1! <i>(7...g3? 8.Rg8+-) </i>8.Nxg4 Nxg4 9.Kxh3 <i>(9.Kxg4 Kg2!=) </i>9...Ne3!=</span> <span class="MsoNormal" style="text-align:justify;display:block;">or 3.Rxg4+? Rxg4 4.Ne3+ Kxh2 5.Nxg4+ Kg3=</span> <span class="MsoNormal" style="text-align:justify;display:block;"> </span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>3...Kxh2 </b></span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>main </b>3...Kg1 4.Nxg4 <i>(4.Kxh6? N1f2=) </i>4...h5 5.Ne5! <i>(5.Ne3? Kxh2 6.Kh6 Re5 7.Rf3 N1f2 8.Rxh5 Rxe3 9.Rhxh3+ Nxh3=) </i>5...Rxe5 <i>(5...Kg2 </i>e.g. <i>6.Nf3 Rg4 7.Kh6 Rxh4 8.Nxh4+ Kxh2 9.Kxh5+-) </i>6.Rxh3 Kg2 7.Rh4!+-</span> <span class="MsoNormal" style="text-align:justify;display:block;"> </span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>4.Kxh6 N1f2 </b></span> <span class="MsoNormal" style="text-align:justify;display:block;">4...Kg3 5.Rxh3+ gxh3 6.Kxg5+-</span> <span class="MsoNormal" style="text-align:justify;display:block;"> </span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>5.Rxf2+ Kg3 6.Rg2+ Kxh4 </b></span> <span class="MsoNormal" style="text-align:justify;display:block;">6...Kf3 7.Rxh3+-</span> <span class="MsoNormal" style="text-align:justify;display:block;"> </span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>7.Rxg4+ Rxg4 8.Nf5# </b></span> <span class="MsoNormal" style="text-align:justify;display:block;"> </span> <p class="MsoNormal"><span style="font-size: 10pt; font-family: &quot;FigurineCB AriesSP&quot;;"> </span></p> <p class="MsoNormal"><b> </b></p></div>