ECO A04

ECO A00–A99 — Flank openings: 1.c4, 1.Nf3, 1.f4 and other first moves, plus early Indian and Benoni systems.

31 named opening lines are classified under ECO code A04.

Colle System: Rhamphorhynchus Variation — 1.Nf3 c5 2.e3 g6 3.d4 Bg7 4.dxc5 Qa5+
Modern Defense: Semi-Averbakh Variation, Polish Variation — 1.Nf3 c5 2.c4 g6 3.d4 Bg7 4.e4 Qb6
Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation — 1.Nf3 c5 2.c4 g6 3.d4 Bg7 4.e4 Qa5+
Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation Accepted — 1.Nf3 g6 2.d4 Bg7 3.e4 d6 4.c4 c5 5.dxc5 Qa5+
Zukertort Defense: Kingside Variation — 1.Nf3 Nh6 2.d4 g6
Zukertort Defense: Sicilian Knight Variation — 1.Nf3 Na6 2.e4 c5
Zukertort Opening — 1.Nf3
Zukertort Opening: Arctic Defense — 1.Nf3 f6
Zukertort Opening: Arctic Defense, Drunken Knight Variation — 1.Nf3 f6 2.e4 Nh6 3.d4 Nf7
Zukertort Opening: Basman Defense — 1.Nf3 h6
Zukertort Opening: Black Mustang Defense — 1.Nf3 Nc6
Zukertort Opening: Drunken Cavalry Variation — 1.Nf3 Na6 2.e4 Nh6
Zukertort Opening: Dutch Variation — 1.Nf3 f5
Zukertort Opening: Herrstrom Gambit — 1.Nf3 g5
Zukertort Opening: Kingside Fianchetto — 1.Nf3 g6
Zukertort Opening: Lisitsyn Gambit — 1.Nf3 f5 2.e4
Zukertort Opening: Lisitsyn Gambit Deferred — 1.Nf3 f5 2.d3 Nf6 3.e4
Zukertort Opening: Pirc Invitation — 1.Nf3 d6
Zukertort Opening: Polish Defense — 1.Nf3 b5
Zukertort Opening: Queen's Gambit Invitation — 1.Nf3 e6
Zukertort Opening: Queenside Fianchetto Variation — 1.Nf3 b6
Zukertort Opening: Ross Gambit — 1.Nf3 e5
Zukertort Opening: Shabalov Gambit — 1.Nf3 e6 2.c4 a6 3.Nc3 c5 4.g3 b5
Zukertort Opening: Sicilian Invitation — 1.Nf3 c5
Zukertort Opening: Slav Invitation — 1.Nf3 c6
Zukertort Opening: Speelsmet Gambit — 1.Nf3 c5 2.d4 cxd4 3.e3
Zukertort Opening: St. George Defense — 1.Nf3 a6
Zukertort Opening: The Walrus — 1.Nf3 e5 2.Nxe5 Nc6 3.Nxc6 dxc6
Zukertort Opening: Vos Gambit — 1.Nf3 d6 2.d4 e5
Zukertort Opening: Wade Defense — 1.Nf3 d6 2.e4 Bg4
Zukertort Opening: Ware Defense — 1.Nf3 a5