ECO D65: Queen's Gambit Declined

ECO D65 is part of volume D — Closed & Semi-Closed Games. The Lichess chess-openings dataset files one named line under it. It is Queen's Gambit Declined: Orthodox Defense, Rubinstein Attack: 1. d4 d5 2. Nf3 Nf6 3. c4 e6 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Rc1 c6 8. Qc2 a6 9. cxd5.

That position has come up in 1,836 Lichess games between players rated 1600 to 2500: White won 51.7%, 6.5% were drawn and Black won 41.8%.