... 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 "Deshauer"]
[Black "Meier"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "1qn4k/2r1b1np/p1Pp1pp1/1p2p3/1P2P1PN/P1R1B2P/B2Q1P1K/2R5 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Ba7 ( { White also wins with: } 1. Qd5 { Threatening mate next. } 1... Na7 2. Bb6 Qe8 3. Bxc7 { White wins with a large material advantage. } ) 1... Qxa7 2. Nxg6+ hxg6 3. Qh6# 1-0