... 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 "Unknown"]
[Black "Unknown427"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[ECO "A00"]
[FEN "3r2k1/pQ1b2pp/3pp3/1N1p4/3Pp3/2P3q1/PP5N/5R1K b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... e3 2. Qc7 Qh4 3. Rg1 e2 4. Nxd6 e1=Q 5. Qxd8+ Qxd8 6. Rxe1 Qb6 7. Ng4 Qxd6 { Black wins with a large material advantage. } 0-1