... 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 "1899.??.??"]
[Round "?"]
[White "Imbish"]
[Black "Hering"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r1bq1bkr/pppp2pp/2n5/4p3/4N3/5Q2/PPPP1PPP/R1B1K1NR w KQ - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Ng5 Qf6 ( { Black dare not try: } 1... Qxg5 2. Qd5# ) 2. Qd5+ Qf7 3. Qxf7# 1-0