... 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 "????.??.??"]
[Round "?"]
[White "Tal"]
[Black "Smyslov"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r1bb1r1k/p4ppp/2p2n1N/7Q/2p5/2B2N2/qPP2PPP/2KR3R w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Qxf7 Qa1+ 2. Kd2 Rxf7 3. Nxf7+ Kg8 4. Rxa1 Kxf7 { White wins with a large
material advantage. } 1-0