<div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f4">a) diagram</span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f4">1.Qh6? </span><span class=" f4">1… Ke4/e6</span><span class=" f4"> 2.Qf4#</span><span class=" f4">    </span><span class=" f4">1…Kf5!</span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f4">1.Qf7? </span><span class=" f4">1… Ke4/e6</span><span class=" f4">  2.Qf4#</span><span class=" f4">    </span><span class=" f4">1…Kd6!</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=" f4">1.Kc5!</span><span class=" f4"> </span><span class=" f4">zugzwang</span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f4">1… e6</span><span class=" f4">  </span><span class=" f4">2.Qf7 Ke4</span><span class=" f4">  3.Kc4 (</span><span class=" f4">C.B.)</span><span class=" f4">  e5</span><span class=" f4">  4.Qf1</span><span class=" f4">  Ke3</span><span class=" f4">  5.Qd3#</span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f4"> </span><span class=" f4"> </span><span class=" f4"> 3… Ke3</span><span class=" f4">  4.Qf2+ Ke4</span><span class=" f4">  5.Qf4#</span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f4"> </span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f4">b) bPe7→ c6</span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f4"><br /></span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f4">1.Qf7!</span><span class=" f4"> </span><span class=" f4">zugzwang</span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f4">1…Kd6</span><span class=" f4">  2.Sf4 </span><span class=" f4">zz</span><span class=" f4">. c5</span><span class=" f4">  3.Sd5 </span><span class=" f4">threat</span><span class=" f4">  4.Qe7+ Kc6</span><span class=" f4">  5.Qc7#</span></div><div class="docpara " style="margin-bottom: 0px; margin-top: 0px;"><span class=" f4"> 3…Ke5</span><span class=" f4">  4.Qf6+ Ke4</span><span class=" f4">  5.Qf4#</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=" f4">1…c5</span><span class=" f4">  </span><span class=" f4">2.Sf4 Kd6</span><span class=" f4"> 3.Sd5……</span><span class=" f4"> </span><span class=" f4"> </span></div><br />