3810 ECO lines with main-line moves and diagrams. Start with the flagship families, or browse by volume.
| Name | ECO | Moves |
|---|
| English Opening: King's English Variation, Kramnik-Shirov Counterattack | A21 | 4 |
| English Opening: King's English Variation, Reversed Sicilian | A21 | 3 |
| English Opening: King's English Variation, Smyslov Defense | A21 | 6 |
| English Opening: King's English Variation, Troger Defense | A21 | 8 |
| English Opening: Carls-Bremen System | A22 | 5 |
| English Opening: King's English Variation, Adhiban Gambit | A22 | 8 |
| English Opening: King's English Variation, Bellon Gambit | A22 | 8 |
| English Opening: King's English Variation, Two Knights Variation | A22 | 4 |
| English Opening: King's English Variation, Two Knights Variation, Reversed Dragon | A22 | 6 |
| English Opening: King's English Variation, Two Knights Variation, Smyslov System | A22 | 6 |
| English Opening: King's English, Erbenheimer Gambit | A22 | 8 |
| English Opening: King's English, Mazedonisch | A22 | 5 |
| English Opening: King's English Variation, Two Knights Variation, Keres Variation | A23 | 6 |
| English Opening: King's English Variation, Two Knights Variation, Keres Variation | A23 | 8 |
| English Opening: King's English Variation, Two Knights Variation, Fianchetto Line | A24 | 6 |
| English Opening: Closed, Taimanov Variation | A25 | 10 |
| English Opening: Closed, Taimanov Variation | A25 | 12 |
| English Opening: King's English Variation, Bremen-Hort Variation | A25 | 12 |
| English Opening: King's English Variation, Closed System | A25 | 9 |
| English Opening: King's English Variation, Hungarian Attack | A25 | 9 |
| English Opening: King's English Variation, Reversed Closed Sicilian | A25 | 4 |
| English Opening: King's English Variation, Reversed Closed Sicilian | A25 | 9 |
| English Opening: King's English Variation, Reversed Closed Sicilian | A25 | 11 |
| English Opening: King's English Variation, Reversed Closed Sicilian | A25 | 12 |
| English Opening: King's English Variation, Reversed Closed Sicilian | A25 | 11 |
| English Opening: King's English Variation, Taimanov Variation | A25 | 8 |
| English Opening: King's English Variation, Botvinnik System | A26 | 11 |
| English Opening: King's English Variation, Closed System, Full Symmetry | A26 | 10 |
| English Opening: King's English Variation, Three Knights System | A27 | 5 |
| English Opening: Four Knights System, Nimzowitsch Variation | A28 | 7 |
| English Opening: King's English Variation, Four Knights Variation | A28 | 6 |
| English Opening: King's English Variation, Four Knights Variation | A28 | 16 |
| English Opening: King's English Variation, Four Knights Variation, Bradley Beach Variation | A28 | 8 |
| English Opening: King's English Variation, Four Knights Variation, Flexible Line | A28 | 7 |
| English Opening: King's English Variation, Four Knights Variation, Korchnoi Line | A28 | 7 |
| English Opening: King's English Variation, Four Knights Variation, Quiet Line | A28 | 7 |
| English Opening: King's English Variation, Four Knights Variation, Quiet Line | A28 | 10 |
| English Opening: King's English Variation, Four Knights Variation, Quiet Line | A28 | 13 |
| English Opening: King's English Variation, Four Knights Variation, Fianchetto Line | A29 | 7 |
| English Opening: King's English Variation, Four Knights Variation, Fianchetto Line | A29 | 8 |
| English Opening: King's English Variation, Four Knights Variation, Fianchetto Line | A29 | 14 |
| English Opening: King's English Variation, Four Knights Variation, Fianchetto Line | A29 | 10 |
| English Opening: King's English Variation, Four Knights Variation, Fianchetto Line | A29 | 11 |
| English Opening: King's English Variation, Four Knights Variation, Fianchetto Line | A29 | 14 |
| English Opening: King's English Variation, Four Knights Variation, Fianchetto Line, Delayed .. Nc6 | A29 | 14 |
| English Opening: King's English Variation, Four Knights Variation, Fianchetto Line, with .. d6 | A29 | 11 |
| English Opening: King's English Variation, Four Knights Variation, Fianchetto Line, with .. d6 | A29 | 13 |
| English Opening: King's English Variation, Four Knights Variation, Fianchetto Line, with .. d6, Be7 | A29 | 12 |
| English Opening: King's English Variation, Four Knights Variation, Fianchetto Line, with .. d6, a6 | A29 | 12 |
| English Opening: King's English Variation, Four Knights Variation, Fianchetto Line, with .. d6, h6 | A29 | 12 |
| English Opening: King's English Variation, Four Knights Variation, Fianchetto Line, with Bc5 | A29 | 12 |
| English Opening: King's English Variation, Four Knights Variation, Fianchetto Line, with Nb6 | A29 | 12 |
| English Opening: Symmetrical Variation | A30 | 2 |
| English Opening: Symmetrical Variation | A30 | 3 |
| English Opening: Symmetrical Variation, Hedgehog Defense | A30 | 12 |
| English Opening: Symmetrical Variation, Napolitano Gambit | A30 | 5 |
| English Opening: Symmetrical, Hedgehog, Flexible Formation | A30 | 20 |
| English Opening: Wing Gambit | A30 | 3 |
| English Opening: Symmetrical Variation, Anti-Benoni Variation | A31 | 5 |
| English Opening: Symmetrical Variation, Anti-Benoni Variation, Spielmann Defense | A32 | 8 |
| English Opening: Symmetrical Variation, Anti-Benoni Variation, Geller Variation | A33 | 12 |
| English Opening: Symmetrical Variation, Anti-Benoni Variation, Spielmann Defense | A33 | 10 |
| English Opening: Symmetrical Variation | A34 | 10 |
| English Opening: Symmetrical Variation, Fianchetto Variation | A34 | 5 |
| English Opening: Symmetrical Variation, Normal Variation | A34 | 3 |
| English Opening: Symmetrical Variation, Rubinstein Variation | A34 | 10 |
| English Opening: Symmetrical Variation, Rubinstein Variation | A34 | 12 |
| English Opening: Symmetrical Variation, Three Knights Variation | A34 | 5 |
| English Opening: Symmetrical Variation | A35 | 6 |
| English Opening: Symmetrical Variation, Four Knights Variation | A35 | 6 |
| English Opening: Symmetrical Variation, Four Knights Variation, Keres-Parma System | A35 | 8 |
| English Opening: Symmetrical Variation, Two Knights Variation | A35 | 4 |
| English Opening: Symmetrical Variation, Botvinnik System | A36 | 9 |
| English Opening: Symmetrical Variation, Botvinnik System Reversed, with e3 | A36 | 10 |
| English Opening: Symmetrical Variation, Two Knights, Fianchetto Variation | A36 | 5 |
| English Opening: Symmetrical Variation, Ultra-Symmetrical Variation | A36 | 8 |
| English Opening: Symmetrical Variation, Botvinnik System Reversed, with Nf3 | A37 | 10 |
| English Opening: Symmetrical Variation, Botvinnik System Reversed, with Nf3 | A37 | 12 |
| English Opening: Symmetrical Variation, Botvinnik System Reversed, with Nf3 | A37 | 12 |
| English Opening: Symmetrical Variation, Botvinnik System Reversed, with Nf3 | A37 | 13 |
| English Opening: Symmetrical Variation, Botvinnik System Reversed, with Nf3 | A37 | 13 |
| English Opening: Symmetrical Variation, Botvinnik System Reversed, with Nf3 | A37 | 14 |
| English Opening: Symmetrical Variation, Three Knights, Fianchetto Variation | A37 | 9 |
| English Opening: Symmetrical Variation, Three Knights, Fianchetto Variation | A37 | 11 |
| English Opening: Symmetrical Variation, Three Knights, Fianchetto Variation | A37 | 11 |
| English Opening: Symmetrical Variation, Double Fianchetto | A38 | 13 |
| English Opening: Symmetrical Variation, Duchamp Variation | A38 | 13 |
| English Opening: Symmetrical Variation, Full Symmetry Line | A38 | 10 |
| English Opening: Symmetrical Variation, Mecking Variation | A39 | 13 |
| Australian Defense | A40 | 2 |
| Benoni Defense: Franco-Sicilian Hybrid | A40 | 14 |
| Borg Defense: Borg Gambit | A40 | 2 |
| Colle System: Pterodactyl Variation | A40 | 8 |
| Colle System: Siroccopteryx Variation | A40 | 10 |
| English Defense | A40 | 2 |
| English Defense | A40 | 4 |
| English Defense: Eastbourne Gambit | A40 | 6 |
| English Defense: Hartlaub Gambit Accepted | A40 | 10 |
| English Defense: Hartlaub Gambit Declined | A40 | 9 |
| English Defense: Perrin Variation | A40 | 8 |
Family pages group related lines: the family head with a diagram, main continuations and every catalogued variation.