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| ECO OPENING CLASSIFICATIONS | |
| The ECO codes for openings are divided into 5 broad categories with 100 subdivisions in each. Click on category A, B, C, D, or E to get to the subdivisions. | |
| A | 1st move without 1. e4 or 1. d4;;
1. d4 without 1 ...d5 or 1... Nf6;; |
| Polish Opening;Grob; Dunst;, Larsen Attack, Bird's Opening, King's Indian Attack, English, Reti, Englung Gambit, Modern Defense, Old Benoni, Trompousky, Queen's Pawn Game, Queen's Indian Defense, Torre Attack, Queen's Indian Defense, Budapest Gambit, Old Indian Defense, Czech Benoni Defense, Benko Gambit, Modern Benoni Defense, Dutch Defense | |
| B | 1. e4 without 1... c5, 1... e6, or 1... e5; 1. e4 c5 |
Nimzovitsch Defense; Owens Defense, Center Counter Defense, Alekhine's Defense, Modern Defense, Pirc Defense, Austrian Attack, Caro-Kann Defense, Sicilian Defense |
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| C | 1. e4 e6;; 1. e4 e5 |
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French Defense, Nordic Gambit, Center Game, Bishop's Opening, Vienna Game, King's Gambit, Latvian Gambit, Philidor's Defense, Petroff's Defense, Ponziani Opening, Scotch Game, Three Knights' Opening, Four Knights' Opening, Italian Game, Ruy Lopez |
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| D | 1. d4 d5;; 1. d4 Nf6 2. c4 g6 + d7-d5 |
Queen's Pawn Opening, Versesov Opening, Gruenfeld Reversed, Colle System, Queen's Gambit, Tchigorin Variation, Albin Counter Gambit, Slav Defense, QG Accepted, QG Declined, Grunfeld Defense |
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| E | 1. d4 Nf6 2. c4 e6;; 1. d4 Nf6 2. c4 g6 ' d7-d5 |
Catalan Opening, Blumenfeld Gambit, Bogo-Indian Defense, Queen's Indian Defense, Nimzo-Indian Defense, King's Indian Defense, Tarrasch Variation |
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