... 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 "Unknown526"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/8/1r6/8/K7/1RP5/k7/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Rxb3 2. c4 Kb2 ( 2... Rc3 3. Kb5 Kb3 4. c5 Rc2 5. c6 Kc3 6. c7 Kd4 7. Kb6 Kd5 8. Kb7 Rb2+ 9. Ka8 Rc2 10. Kb8 Kd6 11. c8=Q Rxc8+ 12. Kxc8 { Draw. } ) 3. c5 Kc3 4. Ka5 Kc4 5. c6 Kc5 6. Ka4 Rc3 7. c7 Kb6 8. c8=Q Rxc8 { Black wins
with a large material advantage. } 0-1