OPENING THEORY

- ECO CODES BASE - OPENINGS -
BASIC ECO CLASSIFICATION

Research by Specific Chess Openings
(Click on the appropriate link to select, among
50 basic menus of the ECB, the right one)

A0 - Various & Reti Openings

A1 - English Opening: 1.c4

A2 - English Opening: 1.c4 e5

A3 - English Opening: 1.c4 c5

A4 - Queen's pawn game: 1.d4 (Nf6)

A5 - Queen's pawn game: 1.d4 Nf6 2.c4

A6 - Benoni Defense

A7 - Benoni Defense: classical

A8 - Duch Defense (Leningrad)

A9 - Dutch Defense (Ilyin-Genevsky)

B0 - King's pawn: Alekhine & Pirc

B1 - Caro-Kann Defense: 1.e4 c6

B2 - Sicilian Defense: 1.e4 c5

B3 - Sicilian Defense: 2.Nf3 Nc6

B4 - Sicilian Defense: Kan & Taimanov

B5 - Sicilian Defense: 2.Nf3 d6

B6 - Sicilian Defense: Richter-Rauzer

B7 - Sicilian Defense: Dragon variation

B8 - Sicilian: Scheveningen variation

B9 - Sicilian: Najdorf variation

C0 - French Defense: 1.e4 e6

C1 - French Defense: 2.d4 d5 3.Nc3

C2 - King's pawn game: 1.e4 e5

C3 - King's Gambit: 1.e4 e5 2.f4

C4 - King's Knight opening: 1.e4 e5 2.Nf3

C5 - King's Knight: 2.Nf3 Nc6 3.Bc4

C6 - Ruy Lopez: 2.Nf3 Nc6 3.Bb5

C7 - Ruy Lopez: 3.Bb5 a6 3.Ba4

C8 - Ruy Lopez: Open & Closed

C9 - Ruy Lopez: Breyer & Chigorin

D0 - Queen' pawn game: 1.d4 d5

D1 - QGD: Slav Defense: 2.c4 c6

D2 - Queen's Gambit Accepted: 2.c4 dxc4

D3 - Queen's Gambit Declined: 2.c4 e6

D4 - QGD: Semi-Tarrasch & Semi-Slav

D5 - QGD: 2c4 e6 3.Nc3 Nf6 4.Bg5

D6 - QGD: Orthodox Defense (Classical)

D7 - QGD: Neo-Gruenfeld: 2...g6 (3.g3 d5)

D8 - QGD: Gruenfeld Defense: 3.Nc3 d5

D9 - QGD: Gruenfeld Three Knights variat.

E0 - Queen's pawn game: 1.d4 Nf6 2.c4 e6

E1 - Bogo-Indian & Queen's Indian

E2 - Nimzo-Indian Defense: 3.Nc3 Bb4

E3 - Nimzo-Indian Defense: Classical

E4 - Nimzo-Indian Defense: 4.e3

E5 - Nimzo-Indian Defense: Main Line

E6 - King's Indian Defense: 2.c4 g6

E7 - King's Indian Defense: 3.Nc3 Bg7 4.e4

E8 - King's Indian Defense: Saemisch

E9 - King's Indian Defense: 5.Nf3

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