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The Queen’s Gambit Declined (or QGD) is a chess opening in which Black declines a pawn offered by White in the Queen’s Gambit:
1. d4 d5
2. c4 e6
Queen’s Gambit Declined: Three Knights Variation
Moves 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3
Parent Queen’s Gambit Declined
The Three Knights Variation of the Queen’s Gambit Declined is usually reached from the move order 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3, played to avoid the Nimzo-Indian Defense (from the white point of view) and the Exchange Variation of the Queen’s Gambit Declined (from the black point of view). Black has a few options in response to the Three Knights Variation.
Vienna Variation: 4…dxc4 [edit]
The Vienna Variation occurs after black plays 4…dxc4 in the Three Knights Variation. The main line of the Vienna continues as 5.e4 Bb4 6.Bg5. White’s pawns or pieces occupy the central squares in exchange for long-term pawn structure weaknesses. An instance of Vienna Variation played at the highest level was Fine–Euwe, AVRO 1938. The Quiet Variation of the Vienna Variation occurs after 5.e3.
Semi-Tarrasch Defense: 4…c5 [edit]
The Semi-Tarrasch Defense occurs after black plays 4…c5 in the Three Knights Variation. An important line in this variation is the Endgame Line where the game continues: 5.cxd5 cxd4 6.Qxd4 exd5 7.e4 dxe4 8.Qxd8+ Kxd8 where the queens get traded off in a similar fashion to the Endgame in the Berlin Defense, resulting in a drawish position.[10] This line has been played by top grandmasters such as Wesley So, Anish Giri, and Magnus Carlsen aiming for a draw. There is also the Exchange Variation where the game continues 5.cxd5 Nxd5 6. e4 Nxc3 7. bxc3 cxd4 8. cxd4, which has been used by played by the likes of Ding Liren, Anish Giri, Vladimir Kramnik, and Magnus Carlsen.
Ragozin Variation: 4…Bb4 [edit]
The Ragozin Variation (ECO code D37–D39) occurs after black plays 4…Bb4 in the Three Knights Variation. The Alekhine Variation of the Ragozin Variation occurs with 5.Qa4 Nc6 6.e3 O-O 7.Qc2. A transposition into the Vienna Variation of the Queen’s Gambit Declined occurs with 5. Bg5 dxc4 6. e4. An alternate line commonly played is 5.cxd5 exd5 6.Bg5 h6 7.Bh4 to avoid transposing into the Vienna.
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