Editing Chess opening (section)

===Closed games: 1.d4 d5===
{{Main article|Closed Game}}
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The openings classified as closed games begin 1.d4 d5. The move 1.d4 offers the same benefits to development and center control as does 1.e4, but unlike with King Pawn openings where the e4-pawn is undefended after the first move, the d4-pawn is protected by White's queen. This slight difference has a tremendous effect on the opening. For instance, whereas the [[King's Gambit]] is rarely played today at the highest levels of chess, the [[Queen's Gambit]] remains a popular weapon at all levels of play. Also, compared with the King Pawn openings, transpositions among variations are more common and critical in the closed games.

The most important closed openings are in the Queen's Gambit family (White plays 2.c4). The Queen's Gambit is somewhat misnamed, since White can always regain the offered pawn if desired. In the [[Queen's Gambit Accepted]], Black plays ...dxc4, giving up the center for free development and the chance to try to give White an isolated queen pawn with a subsequent ...c5 and ...cxd4. White will get active pieces and possibilities for the attack. Black has two popular ways to decline the pawn, the [[Slav Defense|Slav]] (2...c6) and the [[Queen's Gambit Declined]] (2...e6). Both of these moves lead to an immense forest of variations that can require a great deal of opening study to play well. Among the many possibilities in the Queen's Gambit Declined are the Orthodox Defense, Lasker's Defense, the [[Cambridge Springs Defense]], the Tartakower Variation, and the Tarrasch and Semi-Tarrasch Defenses. Black replies to the Queen's Gambit other than 2...dxc4, 2...c6, and 2...e6 are uncommon.

The [[Colle System]] and [[Stonewall Attack]] are classified as [[queen's pawn game]]s because White plays d4 but not c4. They are also examples of ''Systems'', rather than specific opening variations. White develops aiming for a particular formation without great concern over how Black chooses to defend. Both systems are popular with club players because they are easy to learn, but are rarely used by professionals because a well-prepared opponent playing Black can equalize fairly easily. The Stonewall is characterized by the White pawn formation on c3, d4, e3, and f4, and can be achieved by several move orders and against many different Black setups. The diagram positions and the move sequences given below are typical.

Other closed openings have been studied but are less common; see [[Closed Game]] for details.
* 1.d4 d5 Double Queen's Pawn Opening or [[Closed Game]]
* 1.d4 d5 2.c4 [[Queen's Gambit]]
* 1.d4 d5 2.c4 dxc4 [[Queen's Gambit Accepted]] (QGA)
* 1.d4 d5 2.c4 e6 [[Queen's Gambit Declined]] (QGD)
* 1.d4 d5 2.c4 c6 [[Slav Defense]]
* 1.d4 d5 2.e3 Nf6 3.Bd3 c5 4.c3 Nc6 5.f4 (a typical move sequence) [[Stonewall Attack]]
* 1.d4 d5 2.Nf3 Nf6 3.e3 [[Colle System]]