Editing Queen's Gambit (section)

== Variations ==
Technically, any Black response other than 2...dxc4 (or another line with an early ...dxc4 that transposes into the QGA) is a Queen's Gambit Declined, but the Slav, Albin Countergambit, and Chigorin Defense are generally treated separately. There are so many QGD lines after 2...e6 that many of them are distinctive enough to warrant separate treatment.  The Orthodox Defense and the [[Tarrasch Defense]] are two important examples.  (See [[Queen's Gambit Declined]] for more.)

After 1.d4 d5 2.c4:
* 2...e6 – [[Queen's Gambit Declined]] or QGD (''[[Encyclopaedia of Chess Openings|ECO]]'' D30–D69). This is the main line, with many variations.
* 2...dxc4 – [[Queen's Gambit Accepted]] or QGA (D20–D29). Less popular than the Queen's Gambit Declined, it nevertheless has a solid reputation.
* 2...c6 – [[Slav Defense]] (D10–D19). This is a solid response, although many variations are very tactical. If Black plays both ...c6 and ...e6 (in either order), the opening takes characteristics of both the Slav and the Orthodox Defense and is classified as a [[Semi-Slav Defense]].
* 2...e5 – [[Albin Countergambit]] (D08–D09), a sharp attempt by Black to gain the [[Initiative (chess)|initiative]]. It is uncommon in top-level chess but can be a dangerous weapon in club play.
* 2...Nc6 – [[Chigorin Defense]] (D07) The Chigorin Defense takes the game away from the normal positional channels of the QGD and has been favored by [[Alexander Morozevich]] at the top level; it appears to be {{chessgloss|playable}} for Black.
* 2...Bf5{{chesspunc|!?}} – [[Baltic Defense]] (D06), an offbeat but playable line.
* 2...c5 – [[Symmetrical Defense]] (D06). This is rarely played; although it has not been definitely refuted, the play seems to favor White.
* 2...Nf6{{chesspunc|?!}} – [[Marshall Defense]] (D06), named after [[Frank Marshall (chess player)|Frank Marshall]], who first devised the move, he briefly played it in the 1920s before abandoning it. 
* 2...g6?! – Alekhine idea<ref>{{cite book |last1=Benjamin |first1=Joel |author-link1=Joel Benjamin |last2=Schiller |first2=Eric |author-link2=Eric Schiller |title=Unorthodox Openings |publisher=[[Macmillan Publishers (United States)|Macmillan Publishing Company]] |year=1987 |page=97 |quote=Queen's Gambit Declined: Alekhine Idea '''1 d4 d5 2 c4 g6'''|isbn=0-02-016590-0}}</ref> (D06). White can gain the advantage by 3.cxd5 Qxd5 (3...Nf6 4.Qa4 {{chesspunc|+/−}}) 4.Nc3 Qa5 5.Nf3 Bg7 6.Bd2 c6 7.e4 Qb6 8.Bc4{{chesspunc|!}} Bxd4 9.Nxd4 Qxd4 10.Qb3 Qg7 11.0-0 +/− ([[Nikolay Minev|Minev]]).<ref>{{cite book |editor-last=Matanović |editor-first=Aleksandar |editor-link=Aleksandar Matanović |title=Encyclopaedia of Chess Openings |publisher=[[Chess Informant]] |location=Yugoslavia |volume=D |edition=2nd |year=1987 |page=44 |isbn=86-7297-008-X |title-link=Encyclopaedia of Chess Openings }}</ref>

If White chooses to [[fianchetto]] the {{chessgloss|king's bishop}}, the game transposes into the [[Catalan Opening]].