ECO D12

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

3 named opening lines are classified under ECO code D12.

• Slav Defense: Quiet Variation, Amsterdam Variation — 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3 Bf5 5.cxd5 cxd5 6.Nc3 e6 7.Ne5 Nfd7
• Slav Defense: Quiet Variation, Landau Variation — 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3 Bf5 5.cxd5 cxd5 6.Qb3 Qc8 7.Bd2 e6 8.Na3
• Slav Defense: Quiet Variation, Schallopp Defense — 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3 Bf5