... 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 "Unknown298"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "3r1rk1/1p3p1p/p5p1/3pR3/1q1P4/1P2P3/P3Q1PP/2R3K1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... f6 2. Re6 Kf7 3. Qg4 f5 4. Qf4 Rc8 ( { Black dare not try: } 4... Kxe6 5. Qe5+ Kf7 6. Rc7+ Rd7 7. Rxd7+ Qe7 8. Rxe7+ Kg8 9. Qg7# ) 5. Rxc8 Rxc8 6. Re5 Qe1+ 7. Qf1 Qd2 8. h3 Rc1 9. Qxc1 Qxc1+ { Black wins with a large material
advantage. } 0-1