ECO D69: Queen's Gambit Declined

ECO D69 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, Classical Variation: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. Bd3 dxc4 9. Bxc4 Nd5 10. Bxe7 Qxe7 11. O-O Nxc3 12. Rxc3 e5 13. dxe5 Nxe5 14. Nxe5 Qxe5.

That position has come up in 6,255 Lichess games between players rated 1600 to 2500: White won 41.9%, 14.1% were drawn and Black won 44.0%.