[Event "?"]  [Site "?"]  [Date "2017.06.13"]  [Round "?"]  [White "Tactics #57"]  [Black "   Short - Ivanchuk, Reggio Emilia 2011   "]  [Result "*"]  [SetUp "1"]  [FEN "5rk1/1R5p/6p1/P1p3b1/4P2P/4qPK1/2r1N3/4RQ2 b - - 0 1"]  [PlyCount "11"]  [SourceDate "2017.06.13"]   1... Bxh4+ $1 {[pgndiagram] This "simple" bishop sacrifice just wins for Black}  2. Kxh4 Rxf3 {[pgndiagram] And White has no defence} 3. Rb8+ {He can only  prolong things}   (3. Qg2 {Leads to mate after} Qh6+ 4. Kg4 Qh5# {[pgndiagram]})  3... Kg7 4. Rb7+ Kh6 5. Qg2 {[pgndiagram] Now Qh6 is not available, but it  still doesn't save White} Qxe4+ 6. Qg4 g5# $1 {[pgndiagram] And White gets  checkmated. An very vivid example on the "weak king" theme} *