ECO D55

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 D55.

• Queen's Gambit Declined: Anti-Tartakower Variation — 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 O-O 6.e3 h6 7.Bxf6
• Queen's Gambit Declined: Anti-Tartakower Variation, Petrosian Variation — 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 h6 6.Bxf6 Bxf6 7.e3 O-O 8.Rc1 c6 9.Bd3 Nd7 10.O-O dxc4 11.Bxc4
• Queen's Gambit Declined: Modern Variation, Normal Line — 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 O-O 6.e3
• Queen's Gambit Declined: Neo-Orthodox Variation, Main Line — 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 h6 6.Bh4 O-O 7.e3
• Queen's Gambit Declined: Pillsbury Attack — 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Nc3 d5 5.cxd5 exd5 6.Bg5 Be7 7.e3 O-O 8.Bd3 Bb7 9.Ne5