ECO A00

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

140 named opening lines are classified under ECO code A00.

Amar Opening — 1.Nh3
Amar Opening: Paris Gambit — 1.Nh3 d5 2.g3 e5 3.f4
Amar Opening: Paris Gambit, Gent Gambit — 1.Nh3 d5 2.g3 e5 3.f4 Bxh3 4.Bxh3 exf4 5.O-O fxg3 6.hxg3
Amsterdam Attack — 1.e3 e5 2.c4 d6 3.Nc3 Nc6 4.b3 Nf6
Anderssen's Opening — 1.a3
Anderssen's Opening: Polish Gambit — 1.a3 a5 2.b4
Barnes Opening — 1.f3
Barnes Opening: Fool's Mate — 1.f3 e5 2.g4 Qh4#
Barnes Opening: Gedult Gambit — 1.f3 f5 2.e4 fxe4 3.Nc3
Barnes Opening: Hammerschlag — 1.f3 e5 2.Kf2
Clemenz Opening — 1.h3
Clemenz Opening: Spike Lee Gambit — 1.h3 h5 2.g4
Creepy Crawly Formation: Classical Defense — 1.h3 d5 2.a3 e5
Formation: Hippopotamus Attack — 1.a3 e5 2.b3 d5 3.c3 Nf6 4.d3 Nc6 5.e3 Bd6 6.f3 O-O 7.g3
Formation: Shy Attack — 1.a3 e5 2.g3 d5 3.Bg2 Nf6 4.d3 Nc6 5.Nd2 Bd6 6.e3 O-O 7.h3
Global Opening — 1.h3 e5 2.a3
Grob Opening — 1.g4
Grob Opening: Alessi Gambit — 1.g4 f5
Grob Opening: Double Grob — 1.g4 g5
Grob Opening: Double Grob, Coca-Cola Gambit — 1.g4 g5 2.f4
Grob Opening: Grob Gambit — 1.g4 d5 2.Bg2
Grob Opening: Grob Gambit Declined — 1.g4 d5 2.Bg2 c6
Grob Opening: Grob Gambit, Basman Gambit — 1.g4 d5 2.Bg2 h5 3.gxh5
Grob Opening: Grob Gambit, Fritz Gambit — 1.g4 d5 2.Bg2 Bxg4 3.c4
Grob Opening: Grob Gambit, Fritz Gambit, Romford Countergambit — 1.g4 d5 2.Bg2 Bxg4 3.c4 d4 4.Bxb7 Nd7 5.Bxa8 Qxa8
Grob Opening: Grob Gambit, Keres Gambit — 1.g4 d5 2.Bg2 e5 3.d4 exd4 4.c3
Grob Opening: Grob Gambit, Richter-Grob Gambit — 1.g4 d5 2.Bg2 c6 3.c4 dxc4 4.b3
Grob Opening: Keene Defense — 1.g4 d5 2.h3 e5 3.Bg2 c6
Grob Opening: Keene Defense, Main Line — 1.g4 d5 2.h3 e5 3.Bg2 c6 4.d4 e4 5.c4 Bd6 6.Nc3 Ne7
Grob Opening: London Defense — 1.g4 e5 2.h3 Nc6
Grob Opening: Romford Countergambit — 1.g4 d5 2.Bg2 Bxg4 3.c4 d4
Grob Opening: Spike Attack — 1.g4 d5 2.Bg2 c6 3.g5
Grob Opening: Spike, Hurst Attack — 1.g4 e5 2.Bg2 d5 3.c4
Grob Opening: Zilbermints Gambit — 1.g4 d5 2.e4 dxe4 3.Nc3
Grob Opening: Zilbermints Gambit, Schiller Defense — 1.g4 d5 2.e4 dxe4 3.Nc3 h5
Grob Opening: Zilbermints Gambit, Zilbermints-Hartlaub Gambit — 1.g4 d5 2.e4 dxe4 3.Nc3 e5 4.d3
Hungarian Opening — 1.g3
Hungarian Opening: Asten Gambit — 1.g3 Nc6 2.Nc3 d5 3.d4 e5 4.dxe5 d4 5.Ne4 f5
Hungarian Opening: Burk Gambit — 1.g3 e5 2.a3 d5 3.Nf3 e4 4.Nh4 Be7 5.d3
Hungarian Opening: Bücker Gambit — 1.g3 d5 2.Bg2 e5 3.b4
Hungarian Opening: Catalan Formation — 1.g3 d5 2.Bg2 e6
Hungarian Opening: Dutch Defense — 1.g3 f5
Hungarian Opening: Indian Defense — 1.g3 Nf6
Hungarian Opening: Myers Defense — 1.g3 g5
Hungarian Opening: Pachman Gambit — 1.g3 f5 2.e4 fxe4 3.Qh5+ g6
Hungarian Opening: Paris Gambit — 1.g3 e5 2.Nh3 d5 3.f4 Bxh3 4.Bxh3 exf4 5.O-O
Hungarian Opening: Reversed Alekhine — 1.g3 e5 2.Nf3
Hungarian Opening: Reversed Brooklyn Defense, Brooklyn Benko Gambit — 1.g3 e5 2.Nf3 e4 3.Ng1 Nf6 4.b4
Hungarian Opening: Reversed Modern Defense — 1.g3 d5 2.Bg2 c5
Hungarian Opening: Reversed Norwegian Defense — 1.g3 e5 2.Nf3 e4 3.Nh4
Hungarian Opening: Sicilian Invitation — 1.g3 c5
Hungarian Opening: Slav Formation — 1.g3 d5 2.Bg2 c6
Hungarian Opening: Symmetrical Variation — 1.g3 g6
Hungarian Opening: Van Kuijk Gambit — 1.g3 h5 2.Nf3 h4
Hungarian Opening: Winterberg Gambit — 1.g3 d5 2.Bg2 e5 3.c4 dxc4 4.b3
Kádas Opening — 1.h4
Kádas Opening: Beginner's Trap — 1.h4 d5 2.Rh3
Kádas Opening: Koola-Koola Variation — 1.h4 a5
Kádas Opening: Kádas Gambit — 1.h4 c5 2.b4
Kádas Opening: Myers Variation — 1.h4 d5 2.d4 c5 3.e4
Kádas Opening: Schneider Gambit — 1.h4 g5
Kádas Opening: Steinbok Gambit — 1.h4 f5 2.e4 fxe4 3.d3
Lasker Simul Special — 1.g3 h5
Mieses Opening — 1.d3
Mieses Opening: Myers Spike Attack — 1.d3 g6 2.g4
Mieses Opening: Reversed Rat — 1.d3 e5
Mieses Opening: Venezolana Variation — 1.d3 c5 2.Nc3 Nc6 3.g3
Polish Opening — 1.b4
Polish Opening, with d5 — 1.b4 d5
Polish Opening: Baltic Defense — 1.b4 d5 2.Bb2 Bf5
Polish Opening: Birmingham Gambit — 1.b4 c5
Polish Opening: Bugayev Advance Variation — 1.b4 e5 2.Bb2 f6 3.b5
Polish Opening: Bugayev Attack — 1.b4 e5 2.a3
Polish Opening: Czech Defense — 1.b4 e5 2.Bb2 d6
Polish Opening: Dutch Defense — 1.b4 f5
Polish Opening: German Defense — 1.b4 d5 2.Bb2 Qd6
Polish Opening: Grigorian Variation — 1.b4 Nc6
Polish Opening: Karniewski Variation — 1.b4 Nh6
Polish Opening: King's Indian Variation — 1.b4 Nf6 2.Bb2 g6
Polish Opening: King's Indian Variation, Schiffler Attack — 1.b4 Nf6 2.Bb2 g6 3.e4
Polish Opening: King's Indian Variation, Sokolsky Attack — 1.b4 Nf6 2.Bb2 g6 3.c4 Bg7 4.e3 d6 5.Nf3 O-O 6.d4
Polish Opening: Myers Variation — 1.b4 d5 2.Bb2 c6 3.a4
Polish Opening: Outflank Variation — 1.b4 c6
Polish Opening: Outflank Variation, Schuehler Gambit — 1.b4 c6 2.Bb2 a5 3.b5
Polish Opening: Queen's Indian Variation — 1.b4 e6 2.Bb2 Nf6 3.b5 b6
Polish Opening: Queenside Defense — 1.b4 e6 2.Bb2 Nf6 3.b5 a6
Polish Opening: Rooks Swap Line — 1.b4 e6 2.Bb2 Nf6 3.b5 a6 4.a4 axb5 5.axb5 Rxa1 6.Bxa1
Polish Opening: Schiffler-Sokolsky Variation — 1.b4 e6 2.Bb2 Nf6 3.b5 d5 4.e3
Polish Opening: Schuehler Gambit — 1.b4 c6 2.Bb2 a5 3.b5 cxb5 4.e4
Polish Opening: Symmetrical Variation — 1.b4 b5
Polish Opening: Tartakower Gambit — 1.b4 e5 2.Bb2 f6 3.e4
Polish Opening: Wolferts Gambit — 1.b4 e5 2.Bb2 c5
Saragossa Opening — 1.c3
Sodium Attack — 1.Na3
Sodium Attack: Celadon Variation — 1.Na3 e5 2.d3 Bxa3 3.bxa3 d5 4.e3 c5 5.Rb1
Sodium Attack: Chenoboskion Variation — 1.Na3 g6 2.g4
Sodium Attack: Durkin Gambit — 1.Na3 e5 2.Nc4 Nc6 3.e4 f5
Valencia Opening — 1.d3 e5 2.Nd2
Van Geet Opening — 1.Nc3
Van Geet Opening: Battambang Variation — 1.a3 e5 2.Nc3
Van Geet Opening: Billockus-Johansen Gambit — 1.Nc3 e5 2.Nf3 Bc5
Van Geet Opening: Damhaug Gambit — 1.Nc3 d5 2.f4 e5
Van Geet Opening: Dougherty Gambit — 1.Nc3 d5 2.e4 dxe4 3.f3
Van Geet Opening: Dunst-Perrenet Gambit — 1.Nc3 d5 2.e4 dxe4 3.d3
Van Geet Opening: Düsseldorf Gambit — 1.Nc3 c5 2.b4
Van Geet Opening: Gladbacher Gambit — 1.Nc3 e5 2.b3 d5 3.e4 dxe4 4.d3
Van Geet Opening: Hector Gambit — 1.Nc3 d5 2.e4 dxe4 3.Bc4
Van Geet Opening: Hergert Gambit — 1.Nc3 d6 2.f4 e5 3.fxe5 Nc6
Van Geet Opening: Hulsemann Gambit — 1.Nc3 e5 2.e3 d5 3.Qh5 Be6
Van Geet Opening: Jendrossek Gambit — 1.Nc3 d5 2.f4 d4 3.Ne4 f5 4.Nf2 Nf6 5.Nf3 c5 6.b4
Van Geet Opening: Kluever Gambit — 1.Nc3 f5 2.e4 fxe4 3.d3
Van Geet Opening: Laroche Gambit — 1.Nc3 b5
Van Geet Opening: Liebig Gambit — 1.Nc3 e5 2.e3 d5 3.Qh5 Nf6
Van Geet Opening: Melleby Gambit — 1.Nc3 d5 2.f4 d4 3.Ne4 c5
Van Geet Opening: Myers Attack — 1.Nc3 g6 2.h4
Van Geet Opening: Napoleon Attack — 1.Nc3 e5 2.Nf3 Nc6 3.d4
Van Geet Opening: Novosibirsk Variation — 1.Nc3 c5 2.d4 cxd4 3.Qxd4 Nc6 4.Qh4
Van Geet Opening: Nowokunski Gambit — 1.Nc3 e5 2.f4 exf4 3.e4
Van Geet Opening: Pfeiffer Gambit — 1.Nc3 d5 2.f4 d4 3.Ne4 e5
Van Geet Opening: Pfeiffer Gambit, Sleipnir Countergambit — 1.Nc3 d5 2.f4 d4 3.Ne4 e5 4.Nf3
Van Geet Opening: Reversed Nimzowitsch — 1.Nc3 e5
Van Geet Opening: Reversed Scandinavian — 1.Nc3 e5 2.d4 exd4 3.Qxd4 Nc6 4.Qa4
Van Geet Opening: Sicilian Two Knights — 1.Nc3 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4
Van Geet Opening: Sleipnir Gambit — 1.Nc3 d5 2.e3 e5 3.d4 Bb4
Van Geet Opening: Twyble Attack — 1.Nc3 c5 2.Rb1
Van Geet Opening: Tübingen Gambit — 1.Nc3 Nf6 2.g4
Van Geet Opening: Venezolana Variation — 1.Nc3 d5 2.d3 Nf6 3.g3
Van Geet Opening: Warsteiner Gambit — 1.Nc3 d5 2.f4 g5
Van't Kruijs Opening — 1.e3
Van't Kruijs Opening: Bouncing Bishop Variation — 1.e3 e5 2.Bc4 b5 3.Bb3
Van't Kruijs Opening: Keoni-Hiva Gambit, Akahi Variation — 1.e3 e5 2.Nc3 Nf6 3.f4 exf4 4.Nf3
Van't Kruijs Opening: Keoni-Hiva Gambit, Alua Variation — 1.e3 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3
Van't Kruijs Opening: Keoni-Hiva Gambit, Ekolu Variation — 1.e3 e5 2.Nc3 d5 3.f4 exf4 4.Nf3
Ware Opening — 1.a4
Ware Opening: Cologne Gambit — 1.a4 b6 2.d4 d5 3.Nc3 Nd7
Ware Opening: Crab Variation — 1.a4 e5 2.h4
Ware Opening: Meadow Hay Trap — 1.a4 e5 2.Ra3
Ware Opening: Symmetric Variation — 1.a4 a5
Ware Opening: Ware Gambit — 1.a4 e5 2.a5 d5 3.e3 f5 4.a6
Ware Opening: Wing Gambit — 1.a4 b5 2.axb5 Bb7