Chess Openings

3810 ECO lines with main-line moves and diagrams. Start with the flagship families, or browse by volume.

Flagship openings

Sicilian Defense B20
2 plies in the main line
French Defense C00
2 plies in the main line
English Opening A10
1 plies in the main line
Caro-Kann Defense B10
2 plies in the main line
Queen's Pawn Game A40
1 plies in the main line
Queen's Pawn Game A41
2 plies in the main line
Queen's Pawn Game D00
2 plies in the main line
Dutch Defense A80
2 plies in the main line
Alekhine Defense B02
2 plies in the main line
Indian Defense A45
2 plies in the main line
Zukertort Opening A04
1 plies in the main line
Zukertort Opening A05
2 plies in the main line
Zukertort Opening A06
2 plies in the main line
Scandinavian Defense B01
2 plies in the main line
Réti Opening A09
3 plies in the main line
Nimzowitsch Defense B00
2 plies in the main line
Modern Defense B06
2 plies in the main line
King's Pawn Game B00
1 plies in the main line
King's Pawn Game C20
2 plies in the main line
Van Geet Opening A00
1 plies in the main line
Bird Opening A02
1 plies in the main line
Pirc Defense B00
2 plies in the main line
Polish Opening A00
1 plies in the main line
King's Indian Attack A07
3 plies in the main line

All lines by ECO volume

A — Flank openings (817)B — Semi-open games (772)C — Open games & French (1250)D — Closed & semi-closed (614)E — Indian defenses (357)

C — Open games & French

NameECOMoves
Philidor Defense: Albin-Blackburne GambitC418
Philidor Defense: Berger VariationC4119
Philidor Defense: Bird GambitC417
Philidor Defense: Boden VariationC418
Philidor Defense: Exchange VariationC416
Philidor Defense: Exchange VariationC417
Philidor Defense: Exchange VariationC418
Philidor Defense: Hanham VariationC416
Philidor Defense: Hanham Variation, Delmar VariationC419
Philidor Defense: Hanham Variation, Krause VariationC419
Philidor Defense: Hanham Variation, Schlechter VariationC419
Philidor Defense: Hanham Variation, Sharp VariationC418
Philidor Defense: Hanham Variation, Steiner VariationC4111
Philidor Defense: Hanham, Kmoch VariationC419
Philidor Defense: Larsen VariationC418
Philidor Defense: Lion VariationC418
Philidor Defense: Lion Variation, Bishop SacrificeC4111
Philidor Defense: Lion Variation, Delayed Bishop SacrificeC4113
Philidor Defense: Lion Variation, Forcing LineC4115
Philidor Defense: Lion Variation, Lion's Claw, with Bc4 and h6C4112
Philidor Defense: Lion Variation, Lion's Claw, with Be2 and c6C4112
Philidor Defense: Lion Variation, Shirov GambitC419
Philidor Defense: Lion Variation, Sozin VariationC4116
Philidor Defense: Lopez CountergambitC416
Philidor Defense: Lopez Countergambit, Jaenisch VariationC4111
Philidor Defense: Morphy GambitC417
Philidor Defense: Nimzowitsch VariationC416
Philidor Defense: Nimzowitsch VariationC417
Philidor Defense: Nimzowitsch Variation, Klein VariationC417
Philidor Defense: Nimzowitsch Variation, Rellstab VariationC419
Philidor Defense: Nimzowitsch Variation, Sokolsky VariationC419
Philidor Defense: Nimzowitsch, Larobok VariationC4113
Philidor Defense: Nimzowitsch, Locock VariationC417
Philidor Defense: Paulsen AttackC419
Philidor Defense: Philidor CountergambitC416
Philidor Defense: Philidor Countergambit, Berger VariationC4113
Philidor Defense: Philidor Countergambit, Zukertort VariationC417
Philidor Defense: Philidor Countergambit, del Rio AttackC4111
Philidor Defense: Philidor GambitC416
Philidor Defense: Steinitz VariationC417
Petrov's DefenseC424
Petrov's DefenseC425
Petrov's DefenseC426
Petrov's DefenseC427
Petrov's DefenseC428
Petrov's Defense: Classical AttackC429
Petrov's Defense: Classical Attack, Berger VariationC4219
Petrov's Defense: Classical Attack, Chigorin VariationC4215
Petrov's Defense: Classical Attack, Chigorin Variation, Browne AttackC4217
Petrov's Defense: Classical Attack, Chigorin Variation, Main LineC4217
Petrov's Defense: Classical Attack, Closed VariationC4210
Petrov's Defense: Classical Attack, Jaenisch VariationC4215
Petrov's Defense: Classical Attack, Krause VariationC4219
Petrov's Defense: Classical Attack, Marshall TrapC4220
Petrov's Defense: Classical Attack, Marshall VariationC4212
Petrov's Defense: Classical Attack, Marshall Variation, Chinese GambitC4218
Petrov's Defense: Classical Attack, Maróczy VariationC4220
Petrov's Defense: Classical Attack, Mason VariationC4214
Petrov's Defense: Classical Attack, Mason-Showalter VariationC4212
Petrov's Defense: Classical Attack, Staunton VariationC4216
Petrov's Defense: Classical Attack, Tarrasch VariationC4216
Petrov's Defense: Cochrane GambitC427
Petrov's Defense: Cochrane Gambit, Bishop Check LineC429
Petrov's Defense: Cochrane Gambit, Center VariationC429
Petrov's Defense: Cozio AttackC429
Petrov's Defense: Damiano VariationC426
Petrov's Defense: Damiano Variation, Kholmov GambitC428
Petrov's Defense: French AttackC429
Petrov's Defense: Italian VariationC425
Petrov's Defense: Karklins-Martinovsky VariationC427
Petrov's Defense: Kaufmann AttackC429
Petrov's Defense: Millennium AttackC429
Petrov's Defense: Moody GambitC427
Petrov's Defense: Nimzowitsch AttackC429
Petrov's Defense: Paulsen AttackC427
Petrov's Defense: Stafford GambitC426
Petrov's Defense: Stafford Gambit AcceptedC428
Petrov's Defense: Stafford Gambit AcceptedC4210
Petrov's Defense: Stafford Gambit AcceptedC4210
Petrov's Defense: Three Knights GameC425
Bishop's Opening: Urusov GambitC437
Bishop's Opening: Urusov Gambit, Keidansky GambitC439
Petrov's Defense: Modern AttackC435
Petrov's Defense: Modern AttackC436
Petrov's Defense: Modern Attack, Bardeleben VariationC4312
Petrov's Defense: Modern Attack, Center AttackC439
Petrov's Defense: Modern Attack, Center VariationC437
Petrov's Defense: Modern Attack, Murrey VariationC438
Petrov's Defense: Modern Attack, Steinitz VariationC439
Petrov's Defense: Modern Attack, Symmetrical VariationC436
Petrov's Defense: Modern Attack, Tal GambitC439
Petrov's Defense: Modern Attack, Trifunovic VariationC4314
Dresden Opening: The GoblinC447
Irish GambitC445
King's Knight Opening: KonstantinopolskyC445
King's Knight Opening: Normal VariationC444
King's Pawn Game: Dresden OpeningC445
King's Pawn Game: Pachman Wing GambitC445
King's Pawn Game: Schulze-Müller GambitC447
King's Pawn Game: Tayler OpeningC445

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Family pages group related lines: the family head with a diagram, main continuations and every catalogued variation.

Volume A Volume B Volume C Volume D Volume E Gambits Defenses