<div class='user_solution'><span style="text-align:justify;display:block;" class="MsoNormal"><b><span lang="EN-US" style="font-size: 12pt; font-family: &quot;AqChess&quot;,&quot;sans-serif&quot;;">1. a5!</span></b><span lang="EN-US" style="font-size: 12pt; font-family: &quot;AqChess&quot;,&quot;sans-serif&quot;;"> <span></span>[1. b6? Nb4 2. b7 <i>(2. Ke5 Kg6 3. b7 Kf7 4. Kd6 Na6 5. Kxd5 Ke7=;<span> </span><span></span>2. a5 Nd3+ 3. Ke3 Nc5=)</i> <span> </span>2... Na6 3. Ke5 Nc5! 4. b8=N <i>(4. b8=Q <span> </span>Nd7+)</i> <span> </span>4... Nxa4=] <b>1... d4</b> <span> </span>[1... Nd4 2. b6 Ne6+ 3. Ke5 <span> </span>Nc5 4. Kxd5+-] <span>    </span><b>2. Ke4 Na3 3. b6 <span> </span>Nc4 <span> </span>4. b7 Nd6+ 5. Kf3!</b> <span></span>[5. Kxd4? Nxb7 6. a6 Nd6 7. Kc5(d5) Nc8=] <span> </span><b>5... Nxb7 <span></span>6. a6 <span> </span>Nd6(c5) <span></span>7. a7 +-</b></span></span> <span style="text-align:justify;display:block;" class="MsoNormal"><span lang="EN-US" style="font-size: 12pt; font-family: &quot;AqChess&quot;,&quot;sans-serif&quot;;"> </span></span> <span style="text-align:justify;display:block;" class="MsoNormal"><b><span lang="EN-US" style="font-size: 12pt; font-family: &quot;AqChess&quot;,&quot;sans-serif&quot;;">1-0</span></b></span></div>