<div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f3">a) diagram</span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"> </div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f3">1.Kd4!</span><span class=" f3"> </span><span class=" f3">threat</span><span class=" f3"> </span><span class=" f3">2.Rb1 Kd2 3.Qh2#</span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f3">1…Kb2(</span><span class=" f3">Kb3) 2.Rb1+</span><span class=" f3"> Ka3, Kc2 3.Qa8, Qh2#</span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f3">1…b4 </span><span class=" f3">2.Qh2+ Kb3 3.Qa2#</span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"> </div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"> </div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f3">b</span><span class=" f3">) wQh8→b8</span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"> </div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f3">1.Kd4!</span><span class=" f3"> </span><span class=" f3">threat</span><span class=" f3"> </span><span class=" f3">2.Q:b5</span><span class=" f3"> and 3.Qb1#</span><span class=" f3"> </span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f3">1…Kb2(</span><span class=" f3">Kb3) 2.Q:b5+</span><span class=" f3"> Ka3, Kc2 3.Ra1, Qb1#</span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f3">1…</span><span class=" f3">b4 2.Q:b4</span><span class=" f3"> d5 3.Qb1#</span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f3">1…d5 </span><span class=" f3">2.Rb1 Kd2 3.Qh2#</span><span class=" f3"> </span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"> </div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"> </div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f3">c)</span><span class=" f3"> bPd6→e4</span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"> </div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f3">1.Kd4!</span><span class=" f3"> </span><span class=" f3">threat</span><span class=" f3"> </span><span class=" f3">2.Qg8 Kb2 3.Qa2# </span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f3">1…Kb2(</span><span class=" f3">Kb3) 2.Rb1+</span><span class=" f3"> Ka3, Kc2 3.Qa8, Qh2#</span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f3">1…b4 2.Qh2+ Kb3 3.Qa2#</span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"> </div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"> </div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f3">d</span><span class=" f3">) bPb5→d3</span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"> </div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f3">1.Kd4!</span><span class=" f3"> </span><span class=" f3">threat</span><span class=" f3"> </span><span class=" f3">2.Qb8 ~ 3.Qb1#</span><span class=" f3"> </span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f3">1…Kb2(</span><span class=" f3">Kb3) 2.Qb8+</span><span class=" f3"> Ka3, Kc2 3.Ra1, Qb1#</span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f3">1…d5 2.Qb8! d2 3.Qb1#</span></div><br />