<div class='user_solution'><span class="MsoNormal" style="text-align:justify;display:block;"><b>1.Rc5! </b></span> <span class="MsoNormal" style="text-align:justify;display:block;">1.Rg1? Kh2 2.Rcg7 Rh3+ 3.Kxf4 Rh7 4.R7g2+ <i>(4.R1g2+ Kh1÷) </i>4...Kh3 5.Rg3+ Kh2= 1.Rcg7? c2!–+</span> <span class="MsoNormal" style="text-align:justify;display:block;"> </span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>1...Rh7 2.Rg1 Kh2 3.Rcg5 Rh3+ 4.Kxf4 </b></span> <span class="MsoNormal" style="text-align:justify;display:block;">4.Kf2? f3!=</span> <span class="MsoNormal" style="text-align:justify;display:block;"> </span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>4...Rh8! </b></span> <span class="MsoNormal" style="text-align:justify;display:block;">4...Rh5?? 5.R5g2+! mate in 10 moves</span> <span class="MsoNormal" style="text-align:justify;display:block;"> </span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>5.R1g2+</b></span> <span class="MsoNormal" style="text-align:justify;display:block;">5.R5g2+? Kh3 6.Kf3 Rf8+!</span> <span class="MsoNormal" style="text-align:justify;display:block;"> </span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>5...Kh1 </b></span> <span class="MsoNormal" style="text-align:justify;display:block;">5...Kh3? 6.R5g3+</span> <span class="MsoNormal" style="text-align:justify;display:block;"> </span> <span class="MsoNormal" style="text-align:justify;display:block;"><span> </span><b>6.Kf3 Rf8+ </b></span> <span class="MsoNormal" style="text-align:justify;display:block;">6...Rh3+?? 7.Kf2 mate in 10 moves</span> <span class="MsoNormal" style="text-align:justify;display:block;"> </span> <span class="MsoNormal" style="text-align:justify;display:block;"><b>7.Kg3 Rh8 8.Rf2 Kg1 9.Kf3+ Kh1 10.Rf1+ Kh2 11.Rg2+ Kh3 12.Rh1# </b></span></div>