<p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span lang="DE">1 Bb5+ Kd8 </span></p><p></p> <p></p> <p></p> <p></p> <p class="MsoHeader" style="margin: 0cm 0cm 0pt 35.4pt;"><span>If 1… Rxb5+? </span><span lang="EN-GB">2 Kxb5 Kd8 3 Kc6</span><span lang="EN-GB"> Ke8 and the following is purely technical, inaccurate and without interest (ex : 4 Kd6 Kf8 5 Be3! Kg7 6 e7 etc.) </span></p><p></p> <p></p> <p></p> <p></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span lang="DE">2 e7+ Kc7 3 e8=R!! </span></p><p></p> <p></p> <p></p> <p></p> <p class="MsoHeader" style="margin: 0cm 0cm 0pt 35.4pt;"><span lang="EN-GB">Threats 4 Rxb8, and also 4 Re7+ etc. </span></p><p></p> <p></p> <p></p> <p></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span lang="DE">3… </span><span lang="DE">Kxe8 </span></p><p></p> <p></p> <p></p> <p></p> <p class="MsoHeader" style="margin: 0cm 0cm 0pt 35.4pt;"><span>If 3… Ra8+ 4 Rxa8! </span><span lang="EN-GB">This justifies the promotion in Rook (the shortest line following is : 4… Kb7 5 Ra7+ Kb8 (Kd8) 6 Kb6 (Bd6) Kc8 (Kd8) 7 Ra8#): 3 e8=Q? Ra8+! 4 Kb4 Rxe8! Or 4 Qxa8?? stalemate. </span></p><p></p> <p></p> <p></p> <p></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span lang="DE">4 Bxe8 Kd8 5 Bb5! Kc7 6 Ka6 Kd8/Kb8 </span></p><p></p> <p></p> <p></p> <p></p> <p class="MsoHeader" style="margin: 0cm 0cm 0pt 35.4pt;"><span lang="DE">If 6… Kc8 7 Bb6 Kb8 8 Bd7 Ka8 9 Bg1 (or Bf2/e3/d4/c5) Kb8 10 Bh2+ Ka8 11 Bc6# </span></p><p></p> <p></p> <p></p> <p></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span lang="DE">7 Kb6 Kc8 8 Be7 Kb8 9 Ba6 Ka8 10 Bb7+ Kb8 11 Bd6# </span></p><p></p> <p></p> <p></p> <p></p> <span class="MsoNormal" style="text-align:justify;display:block;"><span lang="DE"> </span></span><p> </p> <p></p> <p> </p> <p></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt 36pt;"><span>-<span style="font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: normal;">    </span></span>Under-Promotion in Rook</p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt 36pt;"><span lang="EN-GB"><span>-<span style="font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: normal;">    </span></span></span><span lang="EN-GB">Double switchback of white Bishop to b5 and a6 </span></p><p></p> <p></p> <p></p> <p></p> <span class="MsoNormal" style="text-align:justify;display:block;"><span lang="EN-GB"> </span></span><p> </p> <p></p> <p> </p> <p></p>