ECO D40

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

5 named opening lines are classified under ECO code D40.

• Queen's Gambit Declined: Semi-Tarrasch Defense — 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 c5
• Queen's Gambit Declined: Semi-Tarrasch Defense, Levenfish Variation — 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.e3 Nc6 6.Bd3 Bd6 7.O-O O-O 8.Qe2 Qe7 9.dxc5 Bxc5 10.e4
• Queen's Gambit Declined: Semi-Tarrasch Defense, Pillsbury Variation — 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.Bg5
• Queen's Gambit Declined: Semi-Tarrasch Defense, Symmetrical Variation — 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.e3 Nc6 6.Bd3 Bd6 7.O-O O-O
• Queen's Gambit Declined: Semi-Tarrasch Defense, with e3 — 1.d4 d5 2.c4 c5 3.Nf3 Nf6 4.Nc3 e6 5.e3 Nc6 6.Bd3