<div><br /></div><div>1.Ra1? (2. Ra4+ Bb4 3. Rxb4#) Be5!<br />1. Kh3! (2. Sf4+ Ke4 3. d3#)<br />1.  ... c1S 2. Se6+<br />2. ... Qxe6 3. Sd3+ Ke4 4. Rf4+ Bxf4 5. Sf2# Rook sacrifice, Klasinc, switchback mate.[A]<br />2. ... fxe 3. Bxd6+ e5 4. Se4+ Kxe4+ 5. Rxe5# Double knight sacrifice<br />Black underpromotion to defend.[A]<br />(2. ... Sxe6? 3. Bxd6+ Kg5 4. Se4#)</div><br />