The King is a fighting piece. Use it!
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[Event "World Rapid/Blitz Championship"]
[Site "?"]
[Date "2017.??.??"]
[Round "?"]
[White "Magnus Carlsen"]
[Black "Surya Shekar Ganguly"]
[Result "0-1"]
[BlackElo "0"]
[FEN "6k1/4b1p1/2q1p1Q1/p3p1P1/Pr5P/4P1K1/5P2/3R4 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
{ Now Rxa4 is probably enough to win the game. Black's outside passer on a5 is
strong. However, black can do better. } 1... Rg4+ 2. Kxg4 Qg2+ 3. Kh5 Qf3# 0-1