<div class='user_solution'><font size="3"><b>1.Bf2! </b>to the battery [1.Bd6+? Kb6 2.Bxa3 Kxa7 3.Nb5+ Kb6 4.d4 Nxa4 5.Nd6 f4 6.Ne4 f3 7.d5 c2 8.d6 Kc6 9.Ke7 Nb6 10.Ke6 Nd7=] <b>1...Qa2+ </b>[1...Qxa4 2.Rxa4 Nxa4 3.Ke6 f4 4.Ke5+-; 1...Kd5 2.Ra5+ Qc5 <i>(2...Kd6 3.Bg3+ Kd7 4.Ra7+ Kc8 5.Rc7+ Kb8 6.Nc6+ Ka8 7.Ra7#) </i>3.Rxc5+ Kxc5 4.Nxf5++-; 1...Nxd3 2.Nc2+ Nxf2 3.Nxa3+-] <b>2.Ne6+ </b>selfpin <b>2...Kd6 </b>[2...Kd5 3.Rd7+ Kc6 <i>(3...Ke5 4.Bd4#) </i>4.Rc7+ Kd5 5.Rc5+ Kd6 6.Bg3+ f4 7.Bxf4+ Kd7 8.Rc7#] <b>3.Bg3+ </b>switchback <b>3...f4 4.Bxf4+ Kd5 5.Rd7+ Kc6 6.Rc7+ Kb6 </b>[6...Kd5 7.Rc5#] <b>7.Be3+ Ka5 </b>[7...Ka6 8.Ra7#] <b>8.Ra7+ </b>switchback <b>8...Kb4 9.Bc5+ </b>[9.Rb7+ Ka5 10.Ra7+ Kb4 11.Bc5+ is only waste of time] <b>9...Kb3 </b>unpin of knight <b>10.Nd4# </b>switchback.</font><div><font size="3"><br /></font></div><div><font size="3">Model mate with active blocking.</font><br /></div><br /></div>