ECO D64

ECO D00–D99 — Closed and Semi-Closed Games: 1.d4 d5 queen's pawn openings and the Grünfeld Defense.

1 named opening lines are classified under ECO code D64.

• Queen's Gambit Declined: Orthodox Defense, Rubinstein Attack — 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 O-O 6.e3 Nbd7 7.Rc1 c6 8.Qc2