ECO D42: Queen's Gambit Declined

ECO D42 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: Semi-Tarrasch Defense, Main Line: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 5. cxd5 Nxd5 6. e3 Nc6 7. Bd3.

That position has come up in 16,958 Lichess games between players rated 1600 to 2500: White won 52.1%, 6.5% were drawn and Black won 41.4%.