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Openings classified under ECO A
- Irregular Openings, Nimzovich, Bird, Réti, English, Irregular Queen's Pawn, Modern, Old Benoni,
Indian, Budapest, Old Indian, Benoni, Benko Gambit, Modern Benoni, and Dutch
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Openings classified under ECO B
- Irregular King's Pawn, Scandinavian, Alekhine, Robatsch, Pirc, Caro-Kann, and Sicilian
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Openings classified under ECO C
- French, King's Pawn, Center Game, Bishop's Opening, Vienna, Vienna Gambit, King's Gambit Declined, Falkbeer Counter-Gambit, King's Gambit Accepted, Irregular King's Knight, Philidor, Petrov, King's Knight, Ponziani, Scotch, Three Knights, Four Knights, Italian, Evans Gambit, Giuoco Piano, Two Knights, and Spanish
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Openings classified under ECO D
- Queen's Pawn, Queen's Gambit, Slav, Queen's Gambit Accepted, Queen's Gambit Declined, and Grünfeld
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Openings classified under ECO E
- Catalan, Irregular Indian, Bogo-Indian, Queen's Indian, Nimzo-Indian, and King's Indian
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