3810 ECO lines with main-line moves and diagrams. Start with the flagship families, or browse by volume.
| Name | ECO | Moves |
| Philidor Defense: Albin-Blackburne Gambit | C41 | 8 |
| Philidor Defense: Berger Variation | C41 | 19 |
| Philidor Defense: Bird Gambit | C41 | 7 |
| Philidor Defense: Boden Variation | C41 | 8 |
| Philidor Defense: Exchange Variation | C41 | 6 |
| Philidor Defense: Exchange Variation | C41 | 7 |
| Philidor Defense: Exchange Variation | C41 | 8 |
| Philidor Defense: Hanham Variation | C41 | 6 |
| Philidor Defense: Hanham Variation, Delmar Variation | C41 | 9 |
| Philidor Defense: Hanham Variation, Krause Variation | C41 | 9 |
| Philidor Defense: Hanham Variation, Schlechter Variation | C41 | 9 |
| Philidor Defense: Hanham Variation, Sharp Variation | C41 | 8 |
| Philidor Defense: Hanham Variation, Steiner Variation | C41 | 11 |
| Philidor Defense: Hanham, Kmoch Variation | C41 | 9 |
| Philidor Defense: Larsen Variation | C41 | 8 |
| Philidor Defense: Lion Variation | C41 | 8 |
| Philidor Defense: Lion Variation, Bishop Sacrifice | C41 | 11 |
| Philidor Defense: Lion Variation, Delayed Bishop Sacrifice | C41 | 13 |
| Philidor Defense: Lion Variation, Forcing Line | C41 | 15 |
| Philidor Defense: Lion Variation, Lion's Claw, with Bc4 and h6 | C41 | 12 |
| Philidor Defense: Lion Variation, Lion's Claw, with Be2 and c6 | C41 | 12 |
| Philidor Defense: Lion Variation, Shirov Gambit | C41 | 9 |
| Philidor Defense: Lion Variation, Sozin Variation | C41 | 16 |
| Philidor Defense: Lopez Countergambit | C41 | 6 |
| Philidor Defense: Lopez Countergambit, Jaenisch Variation | C41 | 11 |
| Philidor Defense: Morphy Gambit | C41 | 7 |
| Philidor Defense: Nimzowitsch Variation | C41 | 6 |
| Philidor Defense: Nimzowitsch Variation | C41 | 7 |
| Philidor Defense: Nimzowitsch Variation, Klein Variation | C41 | 7 |
| Philidor Defense: Nimzowitsch Variation, Rellstab Variation | C41 | 9 |
| Philidor Defense: Nimzowitsch Variation, Sokolsky Variation | C41 | 9 |
| Philidor Defense: Nimzowitsch, Larobok Variation | C41 | 13 |
| Philidor Defense: Nimzowitsch, Locock Variation | C41 | 7 |
| Philidor Defense: Paulsen Attack | C41 | 9 |
| Philidor Defense: Philidor Countergambit | C41 | 6 |
| Philidor Defense: Philidor Countergambit, Berger Variation | C41 | 13 |
| Philidor Defense: Philidor Countergambit, Zukertort Variation | C41 | 7 |
| Philidor Defense: Philidor Countergambit, del Rio Attack | C41 | 11 |
| Philidor Defense: Philidor Gambit | C41 | 6 |
| Philidor Defense: Steinitz Variation | C41 | 7 |
| Petrov's Defense | C42 | 4 |
| Petrov's Defense | C42 | 5 |
| Petrov's Defense | C42 | 6 |
| Petrov's Defense | C42 | 7 |
| Petrov's Defense | C42 | 8 |
| Petrov's Defense: Classical Attack | C42 | 9 |
| Petrov's Defense: Classical Attack, Berger Variation | C42 | 19 |
| Petrov's Defense: Classical Attack, Chigorin Variation | C42 | 15 |
| Petrov's Defense: Classical Attack, Chigorin Variation, Browne Attack | C42 | 17 |
| Petrov's Defense: Classical Attack, Chigorin Variation, Main Line | C42 | 17 |
| Petrov's Defense: Classical Attack, Closed Variation | C42 | 10 |
| Petrov's Defense: Classical Attack, Jaenisch Variation | C42 | 15 |
| Petrov's Defense: Classical Attack, Krause Variation | C42 | 19 |
| Petrov's Defense: Classical Attack, Marshall Trap | C42 | 20 |
| Petrov's Defense: Classical Attack, Marshall Variation | C42 | 12 |
| Petrov's Defense: Classical Attack, Marshall Variation, Chinese Gambit | C42 | 18 |
| Petrov's Defense: Classical Attack, Maróczy Variation | C42 | 20 |
| Petrov's Defense: Classical Attack, Mason Variation | C42 | 14 |
| Petrov's Defense: Classical Attack, Mason-Showalter Variation | C42 | 12 |
| Petrov's Defense: Classical Attack, Staunton Variation | C42 | 16 |
| Petrov's Defense: Classical Attack, Tarrasch Variation | C42 | 16 |
| Petrov's Defense: Cochrane Gambit | C42 | 7 |
| Petrov's Defense: Cochrane Gambit, Bishop Check Line | C42 | 9 |
| Petrov's Defense: Cochrane Gambit, Center Variation | C42 | 9 |
| Petrov's Defense: Cozio Attack | C42 | 9 |
| Petrov's Defense: Damiano Variation | C42 | 6 |
| Petrov's Defense: Damiano Variation, Kholmov Gambit | C42 | 8 |
| Petrov's Defense: French Attack | C42 | 9 |
| Petrov's Defense: Italian Variation | C42 | 5 |
| Petrov's Defense: Karklins-Martinovsky Variation | C42 | 7 |
| Petrov's Defense: Kaufmann Attack | C42 | 9 |
| Petrov's Defense: Millennium Attack | C42 | 9 |
| Petrov's Defense: Moody Gambit | C42 | 7 |
| Petrov's Defense: Nimzowitsch Attack | C42 | 9 |
| Petrov's Defense: Paulsen Attack | C42 | 7 |
| Petrov's Defense: Stafford Gambit | C42 | 6 |
| Petrov's Defense: Stafford Gambit Accepted | C42 | 8 |
| Petrov's Defense: Stafford Gambit Accepted | C42 | 10 |
| Petrov's Defense: Stafford Gambit Accepted | C42 | 10 |
| Petrov's Defense: Three Knights Game | C42 | 5 |
| Bishop's Opening: Urusov Gambit | C43 | 7 |
| Bishop's Opening: Urusov Gambit, Keidansky Gambit | C43 | 9 |
| Petrov's Defense: Modern Attack | C43 | 5 |
| Petrov's Defense: Modern Attack | C43 | 6 |
| Petrov's Defense: Modern Attack, Bardeleben Variation | C43 | 12 |
| Petrov's Defense: Modern Attack, Center Attack | C43 | 9 |
| Petrov's Defense: Modern Attack, Center Variation | C43 | 7 |
| Petrov's Defense: Modern Attack, Murrey Variation | C43 | 8 |
| Petrov's Defense: Modern Attack, Steinitz Variation | C43 | 9 |
| Petrov's Defense: Modern Attack, Symmetrical Variation | C43 | 6 |
| Petrov's Defense: Modern Attack, Tal Gambit | C43 | 9 |
| Petrov's Defense: Modern Attack, Trifunovic Variation | C43 | 14 |
| Dresden Opening: The Goblin | C44 | 7 |
| Irish Gambit | C44 | 5 |
| King's Knight Opening: Konstantinopolsky | C44 | 5 |
| King's Knight Opening: Normal Variation | C44 | 4 |
| King's Pawn Game: Dresden Opening | C44 | 5 |
| King's Pawn Game: Pachman Wing Gambit | C44 | 5 |
| King's Pawn Game: Schulze-Müller Gambit | C44 | 7 |
| King's Pawn Game: Tayler Opening | C44 | 5 |
Family pages group related lines: the family head with a diagram, main continuations and every catalogued variation.