ECO D06
ECO D00–D99 — Closed and Semi-Closed Games: 1.d4 d5 queen's pawn openings and the Grünfeld Defense.
13 named opening lines are classified under ECO code D06.
- Queen's Gambit — 1.d4 d5 2.c4
- Queen's Gambit Declined: Austrian Attack, Salvio Countergambit — 1.d4 d5 2.c4 c5 3.dxc5 d4
- Queen's Gambit Declined: Austrian Defense — 1.d4 d5 2.c4 c5
- Queen's Gambit Declined: Austrian Defense, Gusev Countergambit — 1.d4 d5 2.c4 c5 3.cxd5 Nf6
- Queen's Gambit Declined: Austrian Defense, Haberditz Variation — 1.d4 d5 2.c4 c5 3.cxd5 Nf6 4.e4 Nxe4 5.dxc5 Qa5+
- Queen's Gambit Declined: Baltic Defense — 1.d4 d5 2.c4 Bf5
- Queen's Gambit Declined: Baltic Defense, Argentinian Gambit — 1.d4 d5 2.c4 Bf5 3.cxd5 Bxb1 4.Qa4+ c6 5.dxc6 Nxc6
- Queen's Gambit Declined: Baltic Defense, Pseudo-Chigorin — 1.d4 d5 2.c4 Bf5 3.Nc3 e6 4.Nf3 Nc6
- Queen's Gambit Declined: Baltic Defense, Queen Attack — 1.d4 d5 2.c4 Bf5 3.Qb3
- Queen's Gambit Declined: Baltic Defense, Queen Attack Deferred — 1.d4 d5 2.c4 Bf5 3.Nc3 e6 4.Qb3
- Queen's Gambit Declined: Marshall Defense — 1.d4 d5 2.c4 Nf6
- Queen's Gambit Declined: Marshall Defense, Tan Gambit — 1.d4 d5 2.c4 Nf6 3.cxd5 c6
- Queen's Gambit Declined: Zilbermints Gambit — 1.d4 d5 2.c4 b5