<font size="4"><font face="Times New Roman"><font color="#3e6617"><b>1. a5 !</b><br /> 1. Rc6 ? Ba5 !! = (1....Bd8 ? 2. Rc8 ! Nf7 3. a5 ! +-)<br /> 1. Kb7 ? Bxb6 ! = (1....Bd8 ? 2. a5 ! Nf7 3. Rg6+ +- see solution A)<br /> <b>1....Nf7 </b><br /> <b>2. Kb7 !</b><br /> 2. a6 ? Bxb6 ! 3. Kxb6 Nd6 ! =<br /> <br /> <b>A) 2....Bd8 </b><br /> <b>3. Rg6+ Kh7</b><br /> <b>4. a6 Kxg6</b><br /> <b>5. a7 Nd6+</b><br /> <b>6. Kc6 !</b><br /> 6. Ka6 ? Ne8 ! 7. Kb7 Nc7 ! = or 7. a8=Q Nc7+ =<br /> 6. Kb8 ? Bc7+ ! 7. Kxc7 Nb5+ ! = or 7. Ka8 K~ stalemate.<br /> <b>6....Nc4 </b><br /> <b>7. a8=Q ! +-</b><br /> 7. a8=R ? =<br /> <br /> <br /> <b>B) 2....Bxb6 </b><br /> <b>3. axb6 !</b><br /> 3. Kxb6 ? Nd6 ! =<br /> <b>3....Nd8+ ! </b>(3....Nd6+ ? 4. Kc7 ! +- and not : 4. Kc6 ? Nc4! =)<br /> <b>4. Kc8 !</b><br /> 4. Kc7 ? Ne6+ ! =<br /> <b>4....Nc6 ! </b>(4....Nf7 ? 5. Kc7 ! +-)<br /> <b>5. b7 Kf7(g7,h7)</b><br /> <b>6. Kc7 !</b><br /> 6. Kd7 ? Nb8+ ! 7. Kc7 Na6 ! =<br /> <b>6....Nb4 </b><br /> <b>7. Kb6 ! +-</b><br /> </font></font></font><br /> <br />