ECO D31
ECO D00–D99 — Closed and Semi-Closed Games: 1.d4 d5 queen's pawn openings and the Grünfeld Defense.
21 named opening lines are classified under ECO code D31.
- Queen's Gambit Declined: Alapin Variation — 1.d4 e6 2.c4 b6 3.Nc3 d5
- Queen's Gambit Declined: Charousek Variation — 1.d4 d5 2.c4 e6 3.Nc3 Be7
- Queen's Gambit Declined: Charousek Variation, Miladinovic Gambit — 1.d4 d5 2.c4 e6 3.Nc3 Be7 4.e4 dxe4 5.f3
- Queen's Gambit Declined: Janowski Variation — 1.d4 d5 2.c4 e6 3.Nc3 a6
- Queen's Gambit Declined: Queen's Knight Variation — 1.d4 d5 2.c4 e6 3.Nc3
- Queen's Gambit Declined: Semi-Slav, Abrahams Variation — 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.a4 Bb4 6.e3 b5 7.Bd2 a5
- Queen's Gambit Declined: Semi-Slav, Junge Variation — 1.d4 d5 2.c4 e6 3.Nf3 c6 4.Nc3 dxc4 5.a4 Bb4 6.e3 b5 7.Bd2 Qb6
- Queen's Gambit Declined: Semi-Slav, Koomen Variation — 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.e3 b5 6.a4 Bb4 7.Bd2 Qe7
- Semi-Slav Defense: Accelerated Move Order — 1.d4 d5 2.c4 e6 3.Nc3 c6
- Semi-Slav Defense: Anti-Noteboom, Stonewall Variation — 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e3 f5
- Semi-Slav Defense: Anti-Noteboom, Stonewall Variation, Portisch Gambit — 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e3 f5 5.g4
- Semi-Slav Defense: Gunderam Gambit — 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e4 dxe4 5.f3
- Semi-Slav Defense: Marshall Gambit — 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e4
- Semi-Slav Defense: Marshall Gambit, Forgotten Variation — 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e4 dxe4 5.Nxe4 Bb4+ 6.Nc3
- Semi-Slav Defense: Marshall Gambit, Main Line — 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e4 dxe4 5.Nxe4 Bb4+ 6.Bd2
- Semi-Slav Defense: Marshall Gambit, Tolush Variation — 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e4 dxe4 5.Nxe4 Bb4+ 6.Bd2 Qxd4 7.Bxb4 Qxe4+ 8.Be2 c5 9.Bxc5 Qxg2
- Semi-Slav Defense: Noteboom Variation — 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4
- Semi-Slav Defense: Noteboom Variation, Abrahams Variation — 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.a4 Bb4 6.e3 Bxc3+ 7.bxc3 b5 8.axb5 cxb5
- Semi-Slav Defense: Noteboom Variation, Anti-Noteboom Gambit — 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.g3
- Semi-Slav Defense: Noteboom Variation, Anti-Noteboom Variation — 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.Bg5
- Semi-Slav Defense: Noteboom Variation, Anti-Noteboom Variation, Belyavsky Line — 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.Bg5 f6