... 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 "Unknown696"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "2k4r/1p1r4/pRp1p3/P1QpPp1p/6p1/2R1P2P/1PP2PPK/4q3 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qxf2 ( { Black can try: } 1... Rc7 2. Rxb7 Rxb7 3. Qd6 Rc7 4. Rxc6 Rxc6 5. Qxc6+ { Draw. Black's king cannot escape the checks. } ) 2. Rxc6+ bxc6 ( { Black can try: } 2... Kb8 3. Rc8+ Rxc8 4. Qxc8+ Ka7 5. Qc5+ Kb8 6. Qc8+ { Draw by repetition of position. } ) 3. Qxc6+ Kd8 4. Qb6+ Ke7 5. Qb4+ Kf7 6. Qf4 Qxf4+ 7. exf4 Rb8 { Black wins with a large material advantage. } 0-1