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The Queen's Gambit Accepted (or QGA) is a chess opening characterised by the moves: :1. d4 d5 :2. c4 dxc4 The Queen's Gambit Accepted is the third most popular option on Black's second move, after 2...e6 (the Queen's Gambit Declined) and 2...c6 (the Slav Defense). In both of these variations, slow and subtle manoeuvres are often necessary to complete development. White will try to exploit an advantage in space and development, while Black will defend the position and aim for queenside counterplay. The Queen's Gambit is not considered a true gambit, in contrast to the King's Gambit, because the pawn is either regained, or can only be held unprofitably by Black. Black will allow the pawn to be recaptured, and use the time expended to play against White's centre. As Black's 2...dxc4 surrenders the centre, White will try to seize space in the centre and use it to launch an attack on Black's position. Black's game is not devoid of counterchances, however. If the white centre can be held at bay, Black will try to weaken White's centre pawns to gain an advantage in the ensuing endgame by playing ...c5 and ...cxd4 at some stage, and if White responds with exd4, the result will be an isolated pawn on d4 – which can also lead to a keen middlegame battle. If White recaptures with a piece at d4 instead, the centre will be liquidated and a fairly even game will usually ensue. The ''Encyclopaedia of Chess Openings'' (ECO) classifies the Queen's Gambit Accepted under codes D20 to D29. ==History== While the Queen's Gambit Accepted was mentioned in literature as long ago as the 15th century, it was the World Chess Championship 1886 between Wilhelm Steinitz and Johannes Zukertort which introduced the first modern ideas in this opening. Black's play had, until then, centred on holding on to the c4-pawn. Steinitz's plan was to return the pawn, but inflict White with an isolated pawn on d4, then play to exploit the weakness. Even with the modern treatment, the opening suffered from a slightly dubious reputation in the early 20th century, even as Alexander Alekhine introduced further ideas for Black and it was played at the highest levels, beginning in the 1930s, though becoming less popular after World War II, as the Indian Defenses were heavily played. At the end of the 1990s, a number of players among the world elite included the Queen's Gambit Accepted in their repertoires, and the line is currently considered sound. 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 Accepted」の詳細全文を読む スポンサード リンク
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