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ECO AFlank openings · 817 lines

A00Amar Opening1. Nh3
A00Amar Opening: Paris Gambit1. Nh3 d5 2. g3 e5 3. f4
A00Amar Opening: Paris Gambit, Gent Gambit1. Nh3 d5 2. g3 e5 3. f4 Bxh3 4. Bxh3 exf4 5. O-O fxg3 6. hxg3
A00Amsterdam Attack1. e3 e5 2. c4 d6 3. Nc3 Nc6 4. b3 Nf6
A00Anderssen's Opening1. a3
A00Anderssen's Opening: Polish Gambit1. a3 a5 2. b4
A00Barnes Opening1. f3
A00Barnes Opening: Fool's Mate1. f3 e5 2. g4 Qh4#
A00Barnes Opening: Gedult Gambit1. f3 d5 2. e4 g6 3. d4 dxe4 4. c3
A00Barnes Opening: Gedult Gambit1. f3 f5 2. e4 fxe4 3. Nc3
A00Barnes Opening: Hammerschlag1. f3 e5 2. Kf2
A00Clemenz Opening1. h3
A00Clemenz Opening: Spike Lee Gambit1. h3 h5 2. g4
A00Creepy Crawly Formation: Classical Defense1. h3 d5 2. a3 e5
A00Formation: Hippopotamus Attack1. a3 e5 2. b3 d5 3. c3 Nf6 4. d3 Nc6 5. e3 Bd6 6. f3 O-O 7. g3
A00Formation: Shy Attack1. a3 e5 2. g3 d5 3. Bg2 Nf6 4. d3 Nc6 5. Nd2 Bd6 6. e3 O-O 7. h3
A00Global Opening1. h3 e5 2. a3
A00Grob Opening1. g4
A00Grob Opening: Alessi Gambit1. g4 f5
A00Grob Opening: Double Grob1. g4 g5
A00Grob Opening: Double Grob, Coca-Cola Gambit1. g4 g5 2. f4
A00Grob Opening: Grob Gambit1. g4 d5 2. Bg2
A00Grob Opening: Grob Gambit Declined1. g4 d5 2. Bg2 c6
A00Grob Opening: Grob Gambit, Basman Gambit1. g4 d5 2. Bg2 h5 3. gxh5

+ 793 more A-code lines — search to narrow down.

ECO BSemi-open games · 769 lines

B00Barnes Defense1. e4 f6
B00Borg Defense1. e4 g5
B00Borg Defense: Borg Gambit1. e4 g5 2. d4 Bg7
B00Borg Defense: Troon Gambit1. e4 g5 2. d4 h6 3. h4 g4
B00Borg Defense: Zilbermints Gambit1. e4 g5 2. d4 e5
B00Carr Defense1. e4 h6
B00Carr Defense: Zilbermints Gambit1. e4 h6 2. d4 e5
B00Duras Gambit1. e4 f5
B00Fried Fox Defense1. e4 f6 2. d4 Kf7
B00Goldsmith Defense1. e4 h5
B00Goldsmith Defense: Picklepuss Defense1. e4 h5 2. d4 Nf6
B00Hippopotamus Defense1. e4 Nh6
B00Hippopotamus Defense1. e4 Nh6 2. d4 g6 3. c4 f6
B00King's Pawn Game1. e4
B00Lemming Defense1. e4 Na6
B00Lion Defense: Lion's Jaw1. e4 d6 2. d4 Nf6 3. f3
B00Nimzowitsch Defense1. e4 Nc6
B00Nimzowitsch Defense1. e4 Nc6 2. d4
B00Nimzowitsch Defense: Breyer Variation1. e4 Nc6 2. Nc3 Nf6 3. d4 e5
B00Nimzowitsch Defense: Colorado Countergambit1. e4 Nc6 2. Nf3 f5
B00Nimzowitsch Defense: Colorado Countergambit Accepted1. e4 Nc6 2. Nf3 f5 3. exf5
B00Nimzowitsch Defense: Declined Variation1. e4 Nc6 2. Nf3
B00Nimzowitsch Defense: El Columpio Defense1. e4 Nc6 2. Nf3 Nf6 3. e5 Ng4
B00Nimzowitsch Defense: El Columpio Defense, El Columpio Gambit1. e4 Nc6 2. Nf3 Nf6 3. e5 Ng4 4. d4 d6 5. h3 Nh6 6. e6

+ 745 more B-code lines — search to narrow down.

ECO COpen games & the French · 1250 lines

C00French Defense1. e4 e6
C00French Defense1. e4 e6 2. d4 d5
C00French Defense: Alapin Gambit1. e4 e6 2. d4 d5 3. Be3
C00French Defense: Baeuerle Gambit1. e4 e6 2. d4 b5
C00French Defense: Banzai-Leong Gambit1. e4 e6 2. b4
C00French Defense: Banzai-Leong Gambit, Pinova Gambit1. e4 e6 2. b4 Bxb4 3. e5
C00French Defense: Bird Invitation1. e4 e6 2. Bb5
C00French Defense: Carlson Gambit1. e4 e6 2. d4 d5 3. Nf3 dxe4 4. Ne5
C00French Defense: Chigorin Variation1. e4 e6 2. Qe2
C00French Defense: Diemer-Duhm Gambit1. e4 e6 2. d4 d5 3. c4
C00French Defense: Diemer-Duhm Gambit Accepted1. e4 e6 2. d4 d5 3. c4 dxe4
C00French Defense: Franco-Hiva Gambit1. e4 e6 2. d4 f5
C00French Defense: Franco-Hiva Gambit Accepted1. e4 e6 2. d4 f5 3. exf5
C00French Defense: Franco-Sicilian Defense1. e4 e6 2. d4 c5
C00French Defense: Hoffmann Gambit1. e4 e6 2. d4 d5 3. Qe2 e5 4. f4 exf4
C00French Defense: Horwitz Attack1. e4 e6 2. b3
C00French Defense: Horwitz Attack, Papa-Ticulat Gambit1. e4 e6 2. b3 d5 3. Bb2
C00French Defense: King's Indian Attack1. e4 e6 2. d3
C00French Defense: King's Indian Attack, Franco-Hiva Gambit1. e4 e6 2. d3 f5
C00French Defense: Knight Variation1. e4 e6 2. Nf3
C00French Defense: Knight Variation, Franco-Hiva Gambit1. e4 e6 2. Nf3 f5
C00French Defense: La Bourdonnais Variation1. e4 e6 2. f4
C00French Defense: La Bourdonnais Variation, Reuter Gambit1. e4 e6 2. f4 d5 3. Nf3 dxe4
C00French Defense: Mediterranean Defense1. e4 e6 2. d4 Nf6

+ 1226 more C-code lines — search to narrow down.

ECO DClosed games & the Queen's Gambit · 614 lines

D00Amazon Attack1. d4 d5 2. Qd3
D00Blackmar-Diemer Gambit1. d4 d5 2. e4
D00Blackmar-Diemer Gambit1. d4 d5 2. e4 dxe4 3. Nc3 Nf6
D00Blackmar-Diemer Gambit Accepted1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3
D00Blackmar-Diemer Gambit Accepted: Bogoljubow Defense1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 g6
D00Blackmar-Diemer Gambit Accepted: Bogoljubow Defense, Kloss Attack1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 g6 6. Bc4 Bg7 7. O-O O-O 8. Kh1
D00Blackmar-Diemer Gambit Accepted: Bogoljubow Defense, Mad Dog Attack1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 g6 6. Bc4 Bg7 7. h4
D00Blackmar-Diemer Gambit Accepted: Bogoljubow Defense, Nimzowitsch Attack1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 g6 6. Bc4 Bg7 7. Ne5
D00Blackmar-Diemer Gambit Accepted: Bogoljubow Defense, Studier Attack1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 g6 6. Bc4 Bg7 7. O-O O-O 8. Qe1
D00Blackmar-Diemer Gambit Accepted: Euwe Defense1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 e6
D00Blackmar-Diemer Gambit Accepted: Euwe Defense, Duthilleul Gambit1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 e6 6. Bd3
D00Blackmar-Diemer Gambit Accepted: Euwe Defense, Zilbermints Gambit1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 e6 6. Bg5 Be7 7. Bd3 Nc6 8. O-O Nxd4 9. Kh1
D00Blackmar-Diemer Gambit Accepted: Gunderam Defense1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Bf5
D00Blackmar-Diemer Gambit Accepted: Gunderam Defense, Stader Variation1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Bf5 6. Ne5 e6 7. g4 Be4
D00Blackmar-Diemer Gambit Accepted: Holwell Defense1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Qd6
D00Blackmar-Diemer Gambit Accepted: Kaulich Defense1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 c5
D00Blackmar-Diemer Gambit Accepted: Pietrowsky Defense1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Nc6
D00Blackmar-Diemer Gambit Accepted: Ritter Defense1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 b6
D00Blackmar-Diemer Gambit Accepted: Ryder Gambit1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Qxf3
D00Blackmar-Diemer Gambit Accepted: Schlutter Defense1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Nbd7
D00Blackmar-Diemer Gambit Accepted: Teichmann Defense1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Bg4
D00Blackmar-Diemer Gambit Accepted: Teichmann Defense, Ciesielski Variation1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Bg4 6. h3 Bxf3 7. Qxf3 c6 8. Qf2
D00Blackmar-Diemer Gambit Accepted: Teichmann Defense, Classical Variation1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Bg4 6. h3 Bxf3 7. Qxf3 c6 8. Be3
D00Blackmar-Diemer Gambit Accepted: Teichmann Defense, Seidel-Hall Attack1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Bg4 6. h3 Bxf3 7. Qxf3 c6 8. g4

+ 590 more D-code lines — search to narrow down.

ECO EIndian defenses · 357 lines

E00Catalan Opening1. d4 Nf6 2. c4 e6 3. g3
E00Catalan Opening1. d4 Nf6 2. c4 e6 3. g3 d5
E00Catalan Opening: Hungarian Gambit1. d4 Nf6 2. c4 e6 3. g3 e5
E00Indian Defense1. d4 Nf6 2. c4 e6 3. Qb3
E00Indian Defense: Devin Gambit1. d4 Nf6 2. c4 e6 3. g4
E00Indian Defense: Seirawan Attack1. d4 Nf6 2. c4 e6 3. Bg5
E01Catalan Opening: Open Defense1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2
E01Catalan Opening: Tarrasch Defense1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 c5 5. Nf3 Nc6
E02Catalan Opening: Open Defense1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4
E03Catalan Opening: Open Defense1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Qa4+ Nbd7 6. Qxc4
E03Catalan Opening: Open Defense, Alekhine Variation1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Qa4+ Nbd7 6. Qxc4 a6 7. Qc2
E04Catalan Opening: Open Defense1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Nf3
E04Catalan Opening: Open Defense1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 c6 5. Bg2 dxc4
E04Catalan Opening: Open Defense, Modern Sharp Variation1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Nf3 Nc6 6. Qa4 Bb4+
E05Catalan Opening: Open Defense, Classical Line1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Nf3 Be7
E05Catalan Opening: Open Defense, Classical Line1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Be7 5. Bg2 O-O 6. O-O dxc4
E06Catalan Opening: Closed1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3
E06Catalan Opening: Closed1. c4 e6 2. Nf3 d5 3. g3 Nf6 4. Bg2 Be7 5. d4 O-O 6. O-O c6
E06Catalan Opening: Closed1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Bb4+ 5. Bd2 Be7 6. Bg2 O-O 7. O-O c6 8. Bf4 b6
E06Catalan Opening: Closed1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O c6 7. Qc2 b6 8. Nbd2 Bb7 9. e4 Na6
E07Catalan Opening: Closed1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7
E07Catalan Opening: Closed, Botvinnik Variation1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Nc3 c6 8. Qd3
E08Catalan Opening: Closed1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2
E08Catalan Opening: Closed1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 c6 8. b3

+ 333 more E-code lines — search to narrow down.

Opening names and lines from lichess-org/chess-openings (CC0-1.0).