ECO A04
31 named openings and variations are classified as A04. ECO (Encyclopaedia of Chess Openings) codes group openings from A00 to E99 by their opening moves.
- Colle System: Rhamphorhynchus VariationA041. Nf3 c5 2. e3 g6 3. d4 Bg7 4. dxc5 Qa5+
- Modern Defense: Semi-Averbakh Variation, Polish VariationA041. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 Qb6
- Modern Defense: Semi-Averbakh Variation, Pterodactyl VariationA041. Nf3 c5 2. c4 g6 3. d4 Bg7 4. e4 Qa5+
- Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation AcceptedA041. Nf3 g6 2. d4 Bg7 3. e4 d6 4. c4 c5 5. dxc5 Qa5+
- Zukertort Defense: Kingside VariationA041. Nf3 Nh6 2. d4 g6
- Zukertort Defense: Sicilian Knight VariationA041. Nf3 Na6 2. e4 c5
- Zukertort OpeningA041. Nf3
- Zukertort Opening: Arctic DefenseA041. Nf3 f6
- Zukertort Opening: Arctic Defense, Drunken Knight VariationA041. Nf3 f6 2. e4 Nh6 3. d4 Nf7
- Zukertort Opening: Basman DefenseA041. Nf3 h6
- Zukertort Opening: Black Mustang DefenseA041. Nf3 Nc6
- Zukertort Opening: Drunken Cavalry VariationA041. Nf3 Na6 2. e4 Nh6
- Zukertort Opening: Dutch VariationA041. Nf3 f5
- Zukertort Opening: Herrstrom GambitA041. Nf3 g5
- Zukertort Opening: Kingside FianchettoA041. Nf3 g6
- Zukertort Opening: Lisitsyn GambitA041. Nf3 f5 2. e4
- Zukertort Opening: Lisitsyn Gambit DeferredA041. Nf3 f5 2. d3 Nf6 3. e4
- Zukertort Opening: Pirc InvitationA041. Nf3 d6
- Zukertort Opening: Polish DefenseA041. Nf3 b5
- Zukertort Opening: Queen's Gambit InvitationA041. Nf3 e6
- Zukertort Opening: Queenside Fianchetto VariationA041. Nf3 b6
- Zukertort Opening: Ross GambitA041. Nf3 e5
- Zukertort Opening: Shabalov GambitA041. Nf3 e6 2. c4 a6 3. Nc3 c5 4. g3 b5
- Zukertort Opening: Sicilian InvitationA041. Nf3 c5
- Zukertort Opening: Slav InvitationA041. Nf3 c6
- Zukertort Opening: Speelsmet GambitA041. Nf3 c5 2. d4 cxd4 3. e3
- Zukertort Opening: St. George DefenseA041. Nf3 a6
- Zukertort Opening: The WalrusA041. Nf3 e5 2. Nxe5 Nc6 3. Nxc6 dxc6
- Zukertort Opening: Vos GambitA041. Nf3 d6 2. d4 e5
- Zukertort Opening: Wade DefenseA041. Nf3 d6 2. e4 Bg4
- Zukertort Opening: Ware DefenseA041. Nf3 a5