(1.e4? Ka1 2.Ra8+ Kb1 3.e5 Kc1 4.Rc8+ Kb1 5.e6 Ka1 6.Ra8+ Kb1 7.e7 Kc1 8.Rc8+ Kb1 9.e8=Q Ka1 10.Ra8+ Kb1 11.Qe1#<br /><div>(4...Kd1!))</div><div><br /></div><div>(1.Kd2? Ka1 2.Ra8+ Kb1 3.Ke1 Kc1 4.Rc8+ Kb1 5.Nf5 Ka1 6.Ra8+ Kb1 7.Ne3 Kc1 8.Rc8+ Kb1 9.Nf1 Ka1 10.Ra8+ Kb1 11.Nd2+ Kc1 12.Rc8# MM; #12!)<br /></div><br /><div>1.Nf5! Ka1 2.Ra8+ Kb1 3.Ne3 Kc1 4.Rc8+ Kb1 (5.Kd2? Ka1 6.Ra8+ Kb1 7.Ke1 Kc1 ...; #12!)</div><div>5.Nf1 Ka1 6.Ra8+ Kb1 7.Nd2+ Kc1 8.Rc8+ Kd1 9.Nb1 Ke1 10.Rf8 Kd1 11.Rf1#</div><br />