... if your King is under attack you don't worry about losing a Pawn on the Queen's side.
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[Event "Hastings"]
[Site "?"]
[Date "1947.??.??"]
[Round "?"]
[White "Brierly"]
[Black "Sergent"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r4r1k/2pqn1b1/p1bp2pp/1p2pn2/4N3/2PP1PPQ/PPB4P/R1B1RNK1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
{ A classic discovered attack tactic. } 1... Nd4 { Discovering an attack on
white's queen. } 2. Qxd7 Nxf3+ 3. Kh1 Nxe1 { Threatening Rxf1#. } 4. Qh3 { Trying
to save the queen and protect f1.|Has white found a way to keep his
material? } 4... Bd7 5. Qg2 ( { White dare not try: } 5. Qxd7 Rxf1# ) 5... Nxg2 6. Kxg2 { Black wins with a large material advantage. } 0-1