... if your King is under attack you don't worry about losing a Pawn on the Queen's side.
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[Event "rated untimed match"]
[Site "?"]
[Date "1973.??.??"]
[Round "?"]
[White "Hort"]
[Black "Portisch"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "5rk1/r1q2p1p/2b1pQ2/p1Pp1p2/1R6/3BP3/P4PPP/1R4K1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Rg4+ { Opening the white bishop's diagonal. } 1... fxg4 2. Qg5+ Kh8 3. Qh6 { Threatening Qxh7#. } 3... f5 4. Qxf8# 1-0