<div class='user_solution'><div><br /></div><div><span style="font-family: &quot;Times New Roman&quot;; font-size: large;">1. Bg7! Threat 2. Rc1 e4 3. Sg4+ e5 4. Se3 (5. Rc4#) d5 5. Sf5#</span><br style="font-family: &quot;Times New Roman&quot;; font-size: large;" /><br style="font-family: &quot;Times New Roman&quot;; font-size: large;" /><span style="font-family: &quot;Times New Roman&quot;; font-size: large;">1. ... d5! 2. Rc1 d6! 3. Sd7 Ke4 4. Rf1</span><br style="font-family: &quot;Times New Roman&quot;; font-size: large;" /><br style="font-family: &quot;Times New Roman&quot;; font-size: large;" /><span style="font-family: &quot;Times New Roman&quot;; font-size: large;">4. .... Kd4 5. Rf4# pin mate</span><br style="font-family: &quot;Times New Roman&quot;; font-size: large;" /><span style="font-family: &quot;Times New Roman&quot;; font-size: large;">4. ... d4 5. Sf6# switchback</span><br style="font-family: &quot;Times New Roman&quot;; font-size: large;" /><span style="font-family: &quot;Times New Roman&quot;; font-size: large;">Try play 1. Bxd6? e4! 1. Rc1? e4!</span><br style="font-family: &quot;Times New Roman&quot;; font-size: large;" /><span style="font-family: &quot;Times New Roman&quot;; font-size: large;">The white battery threatens to open with check should Black allow it but with proper defense White still mates in five through a more silent opening of the battery;  resulting in either a switchback or a pin mate. [A]</span><br style="font-family: &quot;Times New Roman&quot;; font-size: large;" /></div><br /></div>