<div class='user_solution'><b>1.Nc3+! </b>[1.Kc8? Be5 2.Na3 Rxb6–+; 1.Na3? (or 5.Bd3?) 1...Rxb6–+]<div><b><br /></b></div><div><b>a) 1...Kc6 </b>[1...Kd6 2.Na4 Rf2 3.Bb5 Rf8+ 4.Be8 Rh8 5.Nc3 Kc5 6.Na4+ Kb4 7.Ke7=] <b>2.Kc8! </b>[2.Bb5+? Kb7! 3.Bc4 Rc2 4.Bd5+ Kxb6–+; 2.Na4? Rh2! 3.Bd3 Rh6 4.Ke8 Bg3 5.Bf5 Rh8+ 6.Ke7 Bh4+ 7.Ke6 Re8+ 8.Kf7 Rd8 9.Ke6 Kb5 10.Nc3+ Kxb6–+] <b>2...Rxb6 </b>[2...Rf2 3.Kxb8 Rxf1 4.b7 Rf7 5.Ka7! Rxb7+ 6.Ka6 Rb3 7.Na4!=] <b>3.Bb5+ </b>[3.Bg2+? Kd6 4.Bf1 Ke5–+] <b>3...Kd6 </b>[3...Kc5 4.Na4+=] <b>4.Be2! Ke5 </b>[4...Rb4 (or 8.- Ba7, Bc7) 5.Nb5+=; 4...Kc5 5.Na4+=; 4...Ke6 5.Na4 Rb1 6.Bd3 Rb4 7.Nc5+ and 12. Na6 =] <b>5.Na4 Rb1 </b>[5...Rb3 6.Nc5 Rc3 7.Kxb8=; 5...Rb4 6.Nc5 Kd4 7.Na6 Rb2 8.Nxb8=] <b>6.Nc3 </b>switchback <b>6...Rb2 </b>[6...Rb3 7.Nb5= with threat 8.Kxb8] <b>7.Na4 </b>switchback <b>7...Rb1 8.Nc3 </b>switchback, <b>positional draw, </b></div><div><b><br /></b></div><div><b> b) 1...Kd4 2.Na4</b> <i>(2.Nb5+? Kc5 3.Kc8 Be5 4.b7 Rf2 5.Nc7 Rf8+ 6.Kd7 Kb6 7.Nd5+ Kxb7–+) </i><b>2...Rb4 3.Kc8 Bh2 4.b7 Bf4 5.Be2!</b> <i>(5.Ba6? Rxa4–+) </i><b>5...Bg3 6.Bf1! </b>switchback <i>(6.Bd1? Ke3–+) </i><b>6...Bh2 7.Be2</b> switchback <b>7...Bg3 8.Bf1</b> switchback, <b>positional draw.</b><div><br /></div><div> Miniature. Switchbacks. Synthesis of positional draws.</div><br /></div><br /></div>