<b style="mso-bidi-font-weight: normal"><span lang="FR"><font face="Times New Roman"><font color="#3e6617"><font size="4">1.c7 <br /> </font></font></font></span></b><br /> <span lang="FR"><font color="#3e6617" face="Times New Roman" size="4">1.Rxc8? (1.Re8? Bd6=) 1…Nxc8+ 2.Kb7 Na7(e7) 3.Kxb8 Nxc6+ =</font></span><br /> <b style="mso-bidi-font-weight: normal"><span lang="FR"><font face="Times New Roman"><font color="#3e6617"><font size="4">1…Bxc7<br /> </font></font></font></span></b><b style="mso-bidi-font-weight: normal"><span lang="FR"><font face="Times New Roman"><font color="#3e6617"><font size="4">2.Kxc7 Ba6<br /> </font></font></font></span></b><b style="mso-bidi-font-weight: normal"><span lang="FR"><font face="Times New Roman"><font color="#3e6617"><font size="4">3.Kb6!<br /> </font></font></font></span></b><span lang="FR"><font color="#3e6617" face="Times New Roman" size="4">Switchback.</font></span><br /> <span lang="FR"><font color="#3e6617" face="Times New Roman" size="4">3.Rd7? Nf5! =</font></span><br /> <b style="mso-bidi-font-weight: normal"><span lang="FR"><font face="Times New Roman"><font color="#3e6617"><font size="4">3…Bc4<br /> </font></font></font></span></b><span lang="FR"><font color="#3e6617" face="Times New Roman" size="4">3…Be2 4.Rf8+! Kg4 5.Re8! Nd5+ 6.Kc5 Bf3 and, eg, 7.Rg8 Kf5 8.Rf8+ Nf6 9.Kd6 Kg5 10.a6 Bg2 11.a7 Bh1 12.Rf5+ and 13.Rd5 +-</font></span><br /> <b style="mso-bidi-font-weight: normal"><span lang="FR"><font face="Times New Roman"><font color="#3e6617"><font size="4">4.Kc5! <br /> </font></font></font></span></b><span lang="FR"><font color="#3e6617" face="Times New Roman" size="4">4.Rf8+? Kg3! 5.Kc5 Bd3! 6.Rf7 Nf5 =</font></span><br /> <font face="Times New Roman"><font color="#3e6617"><font size="4"><b style="mso-bidi-font-weight: normal"><span lang="FR">4…Ba6 </span></b><span lang="FR">(black<b style="mso-bidi-font-weight: normal"> </b>switchback)</span></font></font></font><br /> <b style="mso-bidi-font-weight: normal"><span lang="FR"><font face="Times New Roman"><font color="#3e6617"><font size="4">5.Rd6! <br /> </font></font></font></span></b><span lang="FR"><font color="#3e6617" face="Times New Roman" size="4">5.Kb6(?) Bc4 6.Kc5 = loss of time.</font></span><br /> <span lang="FR"><font color="#3e6617" face="Times New Roman" size="4">5.Ra8(?) Bd3 6.Rd8 = loss of time.</font></span><br /> <font face="Times New Roman"><font color="#3e6617"><font size="4"><b style="mso-bidi-font-weight: normal"><span lang="FR">5…Bc8! </span></b><span lang="FR">(black<b style="mso-bidi-font-weight: normal"> </b>switchback)</span></font></font></font><br /> <span lang="FR"><font color="#3e6617" face="Times New Roman" size="4">5…Bf1 6.Rf6+-</font></span><br /> <b style="mso-bidi-font-weight: normal"><span lang="FR"><font face="Times New Roman"><font color="#3e6617"><font size="4">6.Kb6!<br /> </font></font></font></span></b><span lang="FR"><font color="#3e6617" face="Times New Roman" size="4">Switchback.</font></span><br /> <span lang="FR"><font color="#3e6617" face="Times New Roman" size="4">6.Rd8 (?)Ba6 7.Rd6 = loss of time.</font></span><br /> <b style="mso-bidi-font-weight: normal"><span lang="FR"><font face="Times New Roman"><font color="#3e6617"><font size="4">6… Ke(f)4<br /> </font></font></font></span></b><b style="mso-bidi-font-weight: normal"><span lang="FR"><font face="Times New Roman"><font color="#3e6617"><font size="4">7.Kc7!<br /> </font></font></font></span></b><span lang="FR"><font color="#3e6617" face="Times New Roman" size="4">Switchback.</font></span><br /> <b style="mso-bidi-font-weight: normal"><span lang="FR"><font face="Times New Roman"><font color="#3e6617"><font size="4">7… Ke5!<br /> </font></font></font></span></b><b style="mso-bidi-font-weight: normal"><span lang="FR"><font face="Times New Roman"><font color="#3e6617"><font size="4">8.Rh6!<br /> </font></font></font></span></b><span lang="FR"><font color="#3e6617" face="Times New Roman" size="4">White rook must control a6 : 8.Rd1? Ba6! (black switchback) =</font></span><br /> <b style="mso-bidi-font-weight: normal"><span lang="FR"><font face="Times New Roman"><font color="#3e6617"><font size="4">8…Bf5<br /> </font></font></font></span></b><b style="mso-bidi-font-weight: normal"><span lang="FR"><font face="Times New Roman"><font color="#3e6617"><font size="4">9.a6<br /> </font></font></font></span></b><span lang="FR"><font color="#3e6617" face="Times New Roman" size="4">9.Rh5? Nd5 ! 10.Kb7 Nb4! =</font></span><br /> <b style="mso-bidi-font-weight: normal"><span lang="FR"><font face="Times New Roman"><font color="#3e6617"><font size="4">9… Nc8<br /> </font></font></font></span></b><span lang="FR"><font color="#3e6617" face="Times New Roman" size="4">9…Nd5 and, eg, 10.Kd8 Be4 11.a7 Nf4 12.Kd7 Bf5+ 13.Kc7 Be4 14.Rc6 Nd5+ </font></span><br /> <span lang="FR"><font color="#3e6617" face="Times New Roman" size="4">15.Kb8 Nb4 16.a8=Q +-</font></span><br /> <b style="mso-bidi-font-weight: normal"><span lang="FR"><font face="Times New Roman"><font color="#3e6617"><font size="4">10.Kb8! <br /> </font></font></font></span></b><span lang="FR"><font color="#3e6617" face="Times New Roman" size="4">10.Rh5? Na7! 11.Kb6 (11.Kb7 Nb5) 11…Nc8+ =</font></span><br /> <span lang="FR"><font color="#3e6617" face="Times New Roman" size="4">10.Rc6? Be4! (10…Kd5 11.Kb7 +-) 11.Rc5 Kd4! =</font></span><br /> <b style="mso-bidi-font-weight: normal"><span lang="FR"><font face="Times New Roman"><font color="#3e6617"><font size="4">10…Bd7<br /> </font></font></font></span></b><span lang="FR"><font color="#3e6617" face="Times New Roman" size="4">10…Nd6 11.a7 +-</font></span><br /> <b style="mso-bidi-font-weight: normal"><span lang="FR"><font face="Times New Roman"><font color="#3e6617"><font size="4">11.Rh8! Ne7<br /> </font></font></font></span></b><b style="mso-bidi-font-weight: normal"><span lang="FR"><font face="Times New Roman"><font color="#3e6617"><font size="4">12.Kc7! +-<br /> </font></font></font></span></b><span lang="FR"><font color="#3e6617" face="Times New Roman" size="4">Last switchback.</font></span><br /> <span lang="FR"><font color="#3e6617" face="Times New Roman" size="4">12.Rh6(?) Nc8 13.Rh8 (13.Kc7 Bf5 14.Kb8 Bd7) is a loss of time.</font></span><br /> <span lang="FR"><font color="#3e6617" face="Times New Roman" size="4"></font></span><br /> <span lang="FR"><font color="#3e6617" face="Times New Roman" size="4">Four switchbacks by White king.</font></span><br /> <br />