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The Marshall Defense is a chess opening that begins with the moves: :1. d4 d5 :2. c4 Nf6?! The Marshall Defense is a dubious variation of the Queen's Gambit Declined. It was played by Frank Marshall in the 1920s, but he gave it up after losing with it to Alekhine at Baden-Baden in 1925. It is no longer used by experienced players . White may choose to ignore Black's provocative second move with 3.Nc3, which will usually transpose into normal lines of the Queen's Gambit Declined (after 3...e6), the Slav Defence (after 3...c6), the Queen's Gambit Accepted (after 3...dxc4) or the Grünfeld Defence (after 3...g6). ==3.cxd5 Nxd5 4.e4== A common continuation, though White may be playing e4 too early. If Black deviates with 3...Qxd5, 4.Nc3 Qa5 5.Bd2 is strong, e.g. 5...Qb6 6.Nf3 Qxb2?? 7.Rb1 Qa3 8.Nb5, winning . After Black retreats the knight with 4...Nf6, White can continue 5.e5 attacking the knight, or he can get a clear advantage with 5.f3, or a small advantage with 5.Nc3 e5! 6.Nf3! (6.dxe5 Qxd1+ 7.Kxd1 Ng4!〔However, opening database Chessok.com gives 8.Nh3! +.48 denying equality for Black.〕) 6...exd4! 7.Qxd4 . 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「Marshall Defense」の詳細全文を読む スポンサード リンク
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