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ECO D50

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

6 named opening lines are classified under ECO code D50.

Queen's Gambit Declined: Been-Koomen Variation — 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5
Queen's Gambit Declined: Modern Variation — 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5
Queen's Gambit Declined: Pseudo-Tarrasch Variation — 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5 5.cxd5
Queen's Gambit Declined: Pseudo-Tarrasch Variation, Canal Variation — 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5 5.cxd5 Qb6
Queen's Gambit Declined: Pseudo-Tarrasch Variation, Primitive Pillsbury Variation — 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5 5.Nf3 cxd4 6.Qxd4
Queen's Gambit Declined: Semi-Tarrasch Defense, Krause Variation — 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5 5.Nf3 cxd4 6.Nxd4 e5 7.Ndb5 a6 8.Qa4