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ECO D07: Queen's Gambit Declined

ECO D07 is part of volume D — Closed & Semi-Closed Games. The Lichess chess-openings dataset files 11 named lines under it. The shortest is Queen's Gambit Declined: Chigorin Defense: 1. d4 d5 2. c4 Nc6.

That position has come up in 3,349,758 Lichess games between players rated 1600 to 2500: White won 52.4%, 4.7% were drawn and Black won 42.9%.

OpeningMovesPlies
Queen's Gambit Declined: Chigorin Defense 1. d4 d5 2. c4 Nc6 4
Queen's Gambit Declined: Chigorin Defense 1. d4 d5 2. c4 Nc6 3. Nc3 5
Queen's Gambit Declined: Chigorin Defense 1. d4 d5 2. c4 Nc6 3. Nc3 dxc4 6
Queen's Gambit Declined: Chigorin Defense, Exchange Variation 1. d4 d5 2. c4 Nc6 3. cxd5 Qxd5 6
Queen's Gambit Declined: Chigorin Defense, Lazard Gambit 1. d4 d5 2. c4 Nc6 3. Nf3 e5 6
Queen's Gambit Declined: Chigorin Defense, Main Line 1. d4 d5 2. c4 Nc6 3. Nf3 Bg4 6
Queen's Gambit Declined: Chigorin Defense, Tartakower Gambit 1. d4 d5 2. c4 Nc6 3. Nc3 e5 6
Queen's Gambit Declined: Chigorin Defense, Janowski Variation 1. d4 d5 2. c4 Nc6 3. Nc3 dxc4 4. Nf3 7
Queen's Gambit Declined: Chigorin Defense, Main Line, Alekhine Variation 1. d4 d5 2. c4 Nc6 3. Nf3 Bg4 4. Qa4 7
Queen's Gambit Declined: Chigorin Defense, Modern Gambit 1. d4 d5 2. c4 Nc6 3. Nc3 dxc4 4. Nf3 Nf6 8
Queen's Gambit Declined: Chigorin Defense, Exchange Variation, Costa's Line 1. d4 d5 2. c4 Nc6 3. cxd5 Qxd5 4. e3 e5 5. Nc3 Bb4 6. Bd2 Bxc3 7. Bxc3 exd4 8. Ne2 15

https://chesscodex.org/eco/D07