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In chess, the Cambridge Springs Defense (or less commonly, the Pillsbury Variation) is a variation of the Queen's Gambit Declined and begins with the moves: :1. d4 d5 :2. c4 e6 :3. Nc3 Nf6 :4. Bg5 Nbd7 :5. Nf3 c6 :6. e3 Qa5 Black breaks the pin on the h4–d8 diagonal and forms a pin of his own on the c3 knight (exploiting the absence of the White's queen bishop from the queenside). If Black later plays dxc4, there may be threats against the g5-bishop. Note that 5.cxd5 cannot win a pawn because of the Elephant Trap. The main line continues 7.Nd2 Bb4 with the threat of ...Ne4 and pressure along the a5–e1 diagonal. The ''Encyclopaedia of Chess Openings'' (ECO) code is D52. ==Background== The first recorded use of the Cambridge Springs was by Emanuel Lasker in 1892. The name derives from a 1904 tournament in Cambridge Springs, Pennsylvania in which the defense was used several times. Practitioners of the opening have included Efim Bogoljubov, Vasily Smyslov, and Garry Kasparov. The line remains popular among amateurs because there are several traps White must avoid. For example, 7.Nd2 Bb4 8.Qc2 0-0 9.Bd3?? dxc4! (threatening ...Qxg5) 10.Bxf6 cxd3! (a zwischenzug) 11.Qxd3 Nxf6 and Black has won a piece. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Queen's Gambit Declined, Cambridge Springs Defense」の詳細全文を読む スポンサード リンク
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