ECO A40
51 named openings and variations are classified as A40. ECO (Encyclopaedia of Chess Openings) codes group openings from A00 to E99 by their opening moves.
- Australian DefenseA401. d4 Na6
- Benoni Defense: Franco-Sicilian HybridA401. d4 e6 2. c4 c5 3. d5 exd5 4. cxd5 d6 5. Nc3 g6 6. e4 Bg7 7. Nf3 Ne7
- Borg Defense: Borg GambitA401. d4 g5
- Colle System: Pterodactyl VariationA401. d4 g6 2. Nf3 Bg7 3. e3 c5 4. Bd3 Qa5+
- Colle System: Siroccopteryx VariationA401. d4 g6 2. Nf3 Bg7 3. e3 c5 4. Bd3 cxd4 5. Nxd4 Qa5+
- English DefenseA401. d4 b6
- English Defense: Eastbourne GambitA401. d4 b6 2. c4 Bb7 3. Nc3 e5
- English Defense: Hartlaub Gambit AcceptedA401. c4 e6 2. d4 b6 3. Nc3 Bb7 4. e4 f5 5. exf5 Nf6
- English Defense: Hartlaub Gambit DeclinedA401. c4 e6 2. d4 b6 3. Nc3 Bb7 4. e4 f5 5. d5
- English Defense: Perrin VariationA401. d4 e6 2. c4 b6 3. e4 Bb7 4. Bd3 Nc6
- English Defense: Poli GambitA401. d4 e6 2. c4 b6 3. e4 Bb7 4. f3 f5 5. exf5 Nh6
- Englund GambitA401. d4 e5
- Englund Gambit DeclinedA401. d4 e5 2. d5
- Englund Gambit Declined: Diemer CounterattackA401. d4 e5 2. d5 Bc5 3. e4 Qh4
- Englund Gambit Declined: Reversed AlekhineA401. d4 e5 2. Nf3
- Englund Gambit Declined: Reversed BrooklynA401. d4 e5 2. Nf3 e4 3. Ng1
- Englund Gambit Declined: Reversed FrenchA401. d4 e5 2. e3
- Englund Gambit Declined: Reversed KrebsA401. d4 e5 2. Nf3 e4
- Englund Gambit Declined: Reversed Mokele MbembeA401. d4 e5 2. Nf3 e4 3. Ne5
- Englund Gambit: Felbecker GambitA401. d4 e5 2. dxe5 Nc6 3. Nf3 Bc5
- Englund Gambit: Hartlaub-Charlick GambitA401. d4 e5 2. dxe5 d6
- Englund Gambit: Main LineA401. d4 e5 2. dxe5 Nc6 3. Nf3 Qe7
- Englund Gambit: Mosquito GambitA401. d4 e5 2. dxe5 Qh4
- Englund Gambit: Soller GambitA401. d4 e5 2. dxe5 f6
- Englund Gambit: Soller Gambit DeferredA401. d4 e5 2. dxe5 Nc6 3. Nf3 f6
- Englund Gambit: Stockholm VariationA401. d4 e5 2. dxe5 Nc6 3. Nf3 Qe7 4. Qd5
- Englund Gambit: Zilbermints GambitA401. d4 e5 2. dxe5 Nc6 3. Nf3 Nge7
- Horwitz DefenseA401. d4 e6
- Horwitz Defense: Zilbermints GambitA401. d4 e6 2. c4 e5
- Kangaroo DefenseA401. d4 e6 2. c4 Bb4+
- Kangaroo Defense: Keres Defense, Transpositional VariationA401. d4 e6 2. c4 Bb4+ 3. Nc3
- Mikenas DefenseA401. d4 Nc6
- Mikenas Defense: Cannstatter VariationA401. d4 Nc6 2. c4 e5 3. d5 Nd4
- Mikenas Defense: Lithuanian VariationA401. d4 Nc6 2. c4 e5 3. d5 Nce7
- Mikenas Defense: Pozarek GambitA401. d4 Nc6 2. c4 e5 3. dxe5 Nxe5 4. Nc3 Nxc4
- Modern Defense: Beefeater VariationA401. d4 g6 2. c4 Bg7 3. Nc3 c5 4. d5 Bxc3+ 5. bxc3 f5
- Modern Defense: Lizard Defense, Pirc-Diemer GambitA401. d4 g6 2. h4 Nf6 3. h5
- Montevideo DefenseA401. d4 Nc6 2. d5 Nb8
- Polish DefenseA401. d4 b5
- Polish Defense: Spassky Gambit AcceptedA401. d4 b5 2. e4 Bb7 3. Bxb5
- Pterodactyl Defense: Central, Benoni Beefeater PterodactylA401. d4 g6 2. c4 Bg7 3. Nc3 c5 4. d5 d6 5. e4 Bxc3+ 6. bxc3 Qa5
- Pterodactyl Defense: Central, Benoni PterodactylA401. d4 g6 2. c4 Bg7 3. e4 c5 4. d5 Qa5+
- Pterodactyl Defense: Fianchetto, Queen Benoni PterodactylA401. d4 g6 2. c4 Bg7 3. Nc3 c5 4. d5 Qa5
- Pterodactyl Defense: Fianchetto, Queen PteranodonA401. d4 g6 2. c4 Bg7 3. Nc3 c5 4. d5 Bxc3+ 5. bxc3 Qa5
- Pterodactyl Defense: Fianchetto, Queen PterodactylA401. d4 g6 2. Nf3 Bg7 3. g3 c5 4. Bg2 Qa5+
- Pterodactyl Defense: Queen Pterodactyl, Quiet LineA401. d4 g6 2. c4 Bg7 3. Nc3 c5 4. e3
- Queen's Pawn GameA401. d4
- Queen's Pawn Game: Anglo-Slav OpeningA401. d4 c6 2. c4 d6
- Queen's Pawn Game: Modern DefenseA401. d4 g6
- Slav Indian: Kudischewitsch GambitA401. d4 c6 2. Nf3 Nf6 3. c4 b5
- Zaire DefenseA401. d4 Nc6 2. d5 Nb8 3. e4 Nf6 4. e5 Ng8