ECO D06: Queen's Gambit Declined & Queen's Gambit

ECO D06 is part of volume D — Closed & Semi-Closed Games. The Lichess chess-openings dataset files 13 named lines under it, from 2 different openings. The shortest is Queen's Gambit: 1. d4 d5 2. c4.

That position has come up in 120,638,833 Lichess games between players rated 1600 to 2500: White won 51.9%, 5.2% were drawn and Black won 43.0%.

Opening	Moves	Plies
Queen's Gambit	`1. d4 d5 2. c4`	3
Queen's Gambit Declined: Austrian Defense	`1. d4 d5 2. c4 c5`	4
Queen's Gambit Declined: Baltic Defense	`1. d4 d5 2. c4 Bf5`	4
Queen's Gambit Declined: Marshall Defense	`1. d4 d5 2. c4 Nf6`	4
Queen's Gambit Declined: Zilbermints Gambit	`1. d4 d5 2. c4 b5`	4
Queen's Gambit Declined: Baltic Defense, Queen Attack	`1. d4 d5 2. c4 Bf5 3. Qb3`	5
Queen's Gambit Declined: Austrian Attack, Salvio Countergambit	`1. d4 d5 2. c4 c5 3. dxc5 d4`	6
Queen's Gambit Declined: Austrian Defense, Gusev Countergambit	`1. d4 d5 2. c4 c5 3. cxd5 Nf6`	6
Queen's Gambit Declined: Marshall Defense, Tan Gambit	`1. d4 d5 2. c4 Nf6 3. cxd5 c6`	6
Queen's Gambit Declined: Baltic Defense, Queen Attack Deferred	`1. d4 d5 2. c4 Bf5 3. Nc3 e6 4. Qb3`	7
Queen's Gambit Declined: Baltic Defense, Pseudo-Chigorin	`1. d4 d5 2. c4 Bf5 3. Nc3 e6 4. Nf3 Nc6`	8
Queen's Gambit Declined: Austrian Defense, Haberditz Variation	`1. d4 d5 2. c4 c5 3. cxd5 Nf6 4. e4 Nxe4 5. dxc5 Qa5+`	10
Queen's Gambit Declined: Baltic Defense, Argentinian Gambit	`1. d4 d5 2. c4 Bf5 3. cxd5 Bxb1 4. Qa4+ c6 5. dxc6 Nxc6`	10