ECO A00
140 named openings and variations are classified as A00. ECO (Encyclopaedia of Chess Openings) codes group openings from A00 to E99 by their opening moves.
- Amar OpeningA001. Nh3
- Amar Opening: Paris GambitA001. Nh3 d5 2. g3 e5 3. f4
- Amar Opening: Paris Gambit, Gent GambitA001. Nh3 d5 2. g3 e5 3. f4 Bxh3 4. Bxh3 exf4 5. O-O fxg3 6. hxg3
- Amsterdam AttackA001. e3 e5 2. c4 d6 3. Nc3 Nc6 4. b3 Nf6
- Anderssen's OpeningA001. a3
- Anderssen's Opening: Polish GambitA001. a3 a5 2. b4
- Barnes OpeningA001. f3
- Barnes Opening: Fool's MateA001. f3 e5 2. g4 Qh4#
- Barnes Opening: Gedult GambitA001. f3 f5 2. e4 fxe4 3. Nc3
- Barnes Opening: HammerschlagA001. f3 e5 2. Kf2
- Clemenz OpeningA001. h3
- Clemenz Opening: Spike Lee GambitA001. h3 h5 2. g4
- Creepy Crawly Formation: Classical DefenseA001. h3 d5 2. a3 e5
- Formation: Hippopotamus AttackA001. a3 e5 2. b3 d5 3. c3 Nf6 4. d3 Nc6 5. e3 Bd6 6. f3 O-O 7. g3
- Formation: Shy AttackA001. a3 e5 2. g3 d5 3. Bg2 Nf6 4. d3 Nc6 5. Nd2 Bd6 6. e3 O-O 7. h3
- Global OpeningA001. h3 e5 2. a3
- Grob OpeningA001. g4
- Grob Opening: Alessi GambitA001. g4 f5
- Grob Opening: Double GrobA001. g4 g5
- Grob Opening: Double Grob, Coca-Cola GambitA001. g4 g5 2. f4
- Grob Opening: Grob GambitA001. g4 d5 2. Bg2
- Grob Opening: Grob Gambit DeclinedA001. g4 d5 2. Bg2 c6
- Grob Opening: Grob Gambit, Basman GambitA001. g4 d5 2. Bg2 h5 3. gxh5
- Grob Opening: Grob Gambit, Fritz GambitA001. g4 d5 2. Bg2 Bxg4 3. c4
- Grob Opening: Grob Gambit, Fritz Gambit, Romford CountergambitA001. g4 d5 2. Bg2 Bxg4 3. c4 d4 4. Bxb7 Nd7 5. Bxa8 Qxa8
- Grob Opening: Grob Gambit, Keres GambitA001. g4 d5 2. Bg2 e5 3. d4 exd4 4. c3
- Grob Opening: Grob Gambit, Richter-Grob GambitA001. g4 d5 2. Bg2 c6 3. c4 dxc4 4. b3
- Grob Opening: Keene DefenseA001. g4 d5 2. h3 e5 3. Bg2 c6
- Grob Opening: Keene Defense, Main LineA001. g4 d5 2. h3 e5 3. Bg2 c6 4. d4 e4 5. c4 Bd6 6. Nc3 Ne7
- Grob Opening: London DefenseA001. g4 e5 2. h3 Nc6
- Grob Opening: Romford CountergambitA001. g4 d5 2. Bg2 Bxg4 3. c4 d4
- Grob Opening: Spike AttackA001. g4 d5 2. Bg2 c6 3. g5
- Grob Opening: Spike, Hurst AttackA001. g4 e5 2. Bg2 d5 3. c4
- Grob Opening: Zilbermints GambitA001. g4 d5 2. e4 dxe4 3. Nc3
- Grob Opening: Zilbermints Gambit, Schiller DefenseA001. g4 d5 2. e4 dxe4 3. Nc3 h5
- Grob Opening: Zilbermints Gambit, Zilbermints-Hartlaub GambitA001. g4 d5 2. e4 dxe4 3. Nc3 e5 4. d3
- Hungarian OpeningA001. g3
- Hungarian Opening: Asten GambitA001. g3 Nc6 2. Nc3 d5 3. d4 e5 4. dxe5 d4 5. Ne4 f5
- Hungarian Opening: Burk GambitA001. g3 e5 2. a3 d5 3. Nf3 e4 4. Nh4 Be7 5. d3
- Hungarian Opening: Bücker GambitA001. g3 d5 2. Bg2 e5 3. b4
- Hungarian Opening: Catalan FormationA001. g3 d5 2. Bg2 e6
- Hungarian Opening: Dutch DefenseA001. g3 f5
- Hungarian Opening: Indian DefenseA001. g3 Nf6
- Hungarian Opening: Myers DefenseA001. g3 g5
- Hungarian Opening: Pachman GambitA001. g3 f5 2. e4 fxe4 3. Qh5+ g6
- Hungarian Opening: Paris GambitA001. g3 e5 2. Nh3 d5 3. f4 Bxh3 4. Bxh3 exf4 5. O-O
- Hungarian Opening: Reversed AlekhineA001. g3 e5 2. Nf3
- Hungarian Opening: Reversed Brooklyn Defense, Brooklyn Benko GambitA001. g3 e5 2. Nf3 e4 3. Ng1 Nf6 4. b4
- Hungarian Opening: Reversed Modern DefenseA001. g3 d5 2. Bg2 c5
- Hungarian Opening: Reversed Norwegian DefenseA001. g3 e5 2. Nf3 e4 3. Nh4
- Hungarian Opening: Sicilian InvitationA001. g3 c5
- Hungarian Opening: Slav FormationA001. g3 d5 2. Bg2 c6
- Hungarian Opening: Symmetrical VariationA001. g3 g6
- Hungarian Opening: Van Kuijk GambitA001. g3 h5 2. Nf3 h4
- Hungarian Opening: Winterberg GambitA001. g3 d5 2. Bg2 e5 3. c4 dxc4 4. b3
- Kádas OpeningA001. h4
- Kádas Opening: Beginner's TrapA001. h4 d5 2. Rh3
- Kádas Opening: Koola-Koola VariationA001. h4 a5
- Kádas Opening: Kádas GambitA001. h4 c5 2. b4
- Kádas Opening: Myers VariationA001. h4 d5 2. d4 c5 3. e4
- Kádas Opening: Schneider GambitA001. h4 g5
- Kádas Opening: Steinbok GambitA001. h4 f5 2. e4 fxe4 3. d3
- Lasker Simul SpecialA001. g3 h5
- Mieses OpeningA001. d3
- Mieses Opening: Myers Spike AttackA001. d3 g6 2. g4
- Mieses Opening: Reversed RatA001. d3 e5
- Mieses Opening: Venezolana VariationA001. d3 c5 2. Nc3 Nc6 3. g3
- Polish OpeningA001. b4
- Polish Opening, with d5A001. b4 d5
- Polish Opening: Baltic DefenseA001. b4 d5 2. Bb2 Bf5
- Polish Opening: Birmingham GambitA001. b4 c5
- Polish Opening: Bugayev Advance VariationA001. b4 e5 2. Bb2 f6 3. b5
- Polish Opening: Bugayev AttackA001. b4 e5 2. a3
- Polish Opening: Czech DefenseA001. b4 e5 2. Bb2 d6
- Polish Opening: Dutch DefenseA001. b4 f5
- Polish Opening: German DefenseA001. b4 d5 2. Bb2 Qd6
- Polish Opening: Grigorian VariationA001. b4 Nc6
- Polish Opening: Karniewski VariationA001. b4 Nh6
- Polish Opening: King's Indian VariationA001. b4 Nf6 2. Bb2 g6
- Polish Opening: King's Indian Variation, Schiffler AttackA001. b4 Nf6 2. Bb2 g6 3. e4
- Polish Opening: King's Indian Variation, Sokolsky AttackA001. b4 Nf6 2. Bb2 g6 3. c4 Bg7 4. e3 d6 5. Nf3 O-O 6. d4
- Polish Opening: Myers VariationA001. b4 d5 2. Bb2 c6 3. a4
- Polish Opening: Outflank VariationA001. b4 c6
- Polish Opening: Outflank Variation, Schuehler GambitA001. b4 c6 2. Bb2 a5 3. b5
- Polish Opening: Queen's Indian VariationA001. b4 e6 2. Bb2 Nf6 3. b5 b6
- Polish Opening: Queenside DefenseA001. b4 e6 2. Bb2 Nf6 3. b5 a6
- Polish Opening: Rooks Swap LineA001. b4 e6 2. Bb2 Nf6 3. b5 a6 4. a4 axb5 5. axb5 Rxa1 6. Bxa1
- Polish Opening: Schiffler-Sokolsky VariationA001. b4 e6 2. Bb2 Nf6 3. b5 d5 4. e3
- Polish Opening: Schuehler GambitA001. b4 c6 2. Bb2 a5 3. b5 cxb5 4. e4
- Polish Opening: Symmetrical VariationA001. b4 b5
- Polish Opening: Tartakower GambitA001. b4 e5 2. Bb2 f6 3. e4
- Polish Opening: Wolferts GambitA001. b4 e5 2. Bb2 c5
- Saragossa OpeningA001. c3
- Sodium AttackA001. Na3
- Sodium Attack: Celadon VariationA001. Na3 e5 2. d3 Bxa3 3. bxa3 d5 4. e3 c5 5. Rb1
- Sodium Attack: Chenoboskion VariationA001. Na3 g6 2. g4
- Sodium Attack: Durkin GambitA001. Na3 e5 2. Nc4 Nc6 3. e4 f5
- Valencia OpeningA001. d3 e5 2. Nd2
- Van Geet OpeningA001. Nc3
- Van Geet Opening: Battambang VariationA001. a3 e5 2. Nc3
- Van Geet Opening: Billockus-Johansen GambitA001. Nc3 e5 2. Nf3 Bc5
- Van Geet Opening: Damhaug GambitA001. Nc3 d5 2. f4 e5
- Van Geet Opening: Dougherty GambitA001. Nc3 d5 2. e4 dxe4 3. f3
- Van Geet Opening: Dunst-Perrenet GambitA001. Nc3 d5 2. e4 dxe4 3. d3
- Van Geet Opening: Düsseldorf GambitA001. Nc3 c5 2. b4
- Van Geet Opening: Gladbacher GambitA001. Nc3 e5 2. b3 d5 3. e4 dxe4 4. d3
- Van Geet Opening: Hector GambitA001. Nc3 d5 2. e4 dxe4 3. Bc4
- Van Geet Opening: Hergert GambitA001. Nc3 d6 2. f4 e5 3. fxe5 Nc6
- Van Geet Opening: Hulsemann GambitA001. Nc3 e5 2. e3 d5 3. Qh5 Be6
- Van Geet Opening: Jendrossek GambitA001. Nc3 d5 2. f4 d4 3. Ne4 f5 4. Nf2 Nf6 5. Nf3 c5 6. b4
- Van Geet Opening: Kluever GambitA001. Nc3 f5 2. e4 fxe4 3. d3
- Van Geet Opening: Laroche GambitA001. Nc3 b5
- Van Geet Opening: Liebig GambitA001. Nc3 e5 2. e3 d5 3. Qh5 Nf6
- Van Geet Opening: Melleby GambitA001. Nc3 d5 2. f4 d4 3. Ne4 c5
- Van Geet Opening: Myers AttackA001. Nc3 g6 2. h4
- Van Geet Opening: Napoleon AttackA001. Nc3 e5 2. Nf3 Nc6 3. d4
- Van Geet Opening: Novosibirsk VariationA001. Nc3 c5 2. d4 cxd4 3. Qxd4 Nc6 4. Qh4
- Van Geet Opening: Nowokunski GambitA001. Nc3 e5 2. f4 exf4 3. e4
- Van Geet Opening: Pfeiffer GambitA001. Nc3 d5 2. f4 d4 3. Ne4 e5
- Van Geet Opening: Pfeiffer Gambit, Sleipnir CountergambitA001. Nc3 d5 2. f4 d4 3. Ne4 e5 4. Nf3
- Van Geet Opening: Reversed NimzowitschA001. Nc3 e5
- Van Geet Opening: Reversed ScandinavianA001. Nc3 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qa4
- Van Geet Opening: Sicilian Two KnightsA001. Nc3 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4
- Van Geet Opening: Sleipnir GambitA001. Nc3 d5 2. e3 e5 3. d4 Bb4
- Van Geet Opening: Twyble AttackA001. Nc3 c5 2. Rb1
- Van Geet Opening: Tübingen GambitA001. Nc3 Nf6 2. g4
- Van Geet Opening: Venezolana VariationA001. Nc3 d5 2. d3 Nf6 3. g3
- Van Geet Opening: Warsteiner GambitA001. Nc3 d5 2. f4 g5
- Van't Kruijs OpeningA001. e3
- Van't Kruijs Opening: Bouncing Bishop VariationA001. e3 e5 2. Bc4 b5 3. Bb3
- Van't Kruijs Opening: Keoni-Hiva Gambit, Akahi VariationA001. e3 e5 2. Nc3 Nf6 3. f4 exf4 4. Nf3
- Van't Kruijs Opening: Keoni-Hiva Gambit, Alua VariationA001. e3 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3
- Van't Kruijs Opening: Keoni-Hiva Gambit, Ekolu VariationA001. e3 e5 2. Nc3 d5 3. f4 exf4 4. Nf3
- Ware OpeningA001. a4
- Ware Opening: Cologne GambitA001. a4 b6 2. d4 d5 3. Nc3 Nd7
- Ware Opening: Crab VariationA001. a4 e5 2. h4
- Ware Opening: Meadow Hay TrapA001. a4 e5 2. Ra3
- Ware Opening: Symmetric VariationA001. a4 a5
- Ware Opening: Ware GambitA001. a4 e5 2. a5 d5 3. e3 f5 4. a6
- Ware Opening: Wing GambitA001. a4 b5 2. axb5 Bb7