... 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 "Unknown562"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/p1p3k1/1p5p/2b1N3/4B3/2P3P1/1q5P/5R1K w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Rf7+ Kh8 2. Ng6+ ( { White can try: } 2. Bh7 Qa1+ 3. Kg2 Qa2+ 4. Kf1 Qxf7+ 5. Nxf7+ Kxh7 { Black wins with a large material advantage. } ) 2... Kg8 3. Bd5 Qb1+ ( { Black dare not try: } 3... Qb5 4. Re7# ) 4. Rf1+ Kg7 5. Rxb1 Kxg6 { White
wins with a large material advantage. } 1-0