We list the main ECO openings alphabetically showing the ECO code, the opening name and the number of variations available under the opening.
A57 Benko (Volga) Gambit 3 d4,Nf6,c4,c5,d5,b5
A02 Bird's Opening 2 f4
C23 Bishop's Opening 2 e4,e5,Bc4
E10 Blumenfeld Gambit 1 d4,Nf6,c4,e6,Nf3
E11 Bogo-Indian Defense 1 d4,Nf6,c4,e6,Nf3,Bb4+
A51 Budapest Gambit 2 d4,Nf6,c4,e5
B10 Caro-Kann Defense 10 e4,c6
E00 Catalan Opening 10 d4,Nf6,c4,e6
C22 Center Game 1 e4,e5,d4,exd4,Qxd4,Nc6
D05 Colle System 1 d4,d5,Nf3,Nf6,e3,e6
A56 Czech Benoni Defense 1 d4,Nf6,c4,c5
A80 Dutch Defense 20 d4,f5
A10 English Opening 28 c4
A40 Englund Gambit 1 d4
C47 Four Knights' Opening 3 e4,e5,Nf3,Nc6,Nc3,Nf6,d4
C00 French Defense 21 e4,e6
D02 Gruenfeld Reversed Opening 1 d4,d5,Nf3
D70 Grunfeld Defense 30 d4,Nf6,c4,g6,f3,d5
C50 Guioco Piano 8 e4,e5,Nf3,Nc6,Bc4
C53 Italian Game (Guioco Piano) 2 e4,e5,Nf3,Nc6,Bc4,Bc5,c3
C30 King's Gambit 10 e4,e5,f4
A04 King's Indian Attack 6 Nf3
E60 King's Indian Defense 40 d4,Nf6,c4,g6
A01 Larsen Attack 1 b3
C40 Latvian Gambit 1 e4,e5,Nf3
A60 Modern Benoni Defense 20 d4,Nf6,c4,c5,d5,e6
A41 Modern Defense 3 d4,d6
E20 Nimzo-Indian Defense 40 d4,Nf6,c4,e6,Nc3,Bb4
B00 Nimzowitsch Defense; Owens Defense 1 e4
C21 Nordic Gambit 1 e4,e5,d4,exd4
A43 Old Benoni Defense 2 d4,c5
A53 Old Indian Defense 3 d4,Nf6,c4,d6
C41 Philidor's Defense 1 e4,e5,Nf3,d6
B07 Pirc Defense 3 e4,d6,d4,Nf6,Nc3
A00 Polish Opening; Sokolsky's Opening 1 b4
C44 Ponziani Opening 1 e4,e5,Nf3,Nc6
D06 Queen's Gambit 64 d4,d5,c4
A47 Queen's Indian Defense 10 d4,Nf6,Nf3,b6
A46 Queen's Pawn Game 1 d4,Nf6,Nf3
D00 Queen's Pawn Opening 3 d4,d5
A11 Reti Opening 2 c4,c6
C42 Russian (Petroff's) Defense 2 e4,e5,Nf3,Nf6
C61 Ruy Lopez 34 e4,e5,Nf3,Nc6,Bb5,Nd4
B01 Scandinavian Defense 1 e4,d5
C45 Scotch Game 1 e4,e5,Nf3,Nc6,d4,exd4,Nxd4
B20 Sicilian Defense 79 e4,c5
C60 Spanish Opening (Ruy Lopez) 6 e4,e5,Nf3,Nc6,Bb5
C46 Three Knights' Opening 1 e4,e5,Nf3,Nc6,Nc3
A48 Torre Attack 2 d4,Nf6,Nf3,g6
A45 Trompovsky Attack 1 d4,Nf6
D01 Veresov Opening 1 d4,d5,Nc3,Nf6,Bg5
C25 Vienna Game 5 e4,e5,Nc3
ECO Lines
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B02 Alekhine's Defense 4 e4,Nf6A57 Benko (Volga) Gambit 3 d4,Nf6,c4,c5,d5,b5
A02 Bird's Opening 2 f4
C23 Bishop's Opening 2 e4,e5,Bc4
E10 Blumenfeld Gambit 1 d4,Nf6,c4,e6,Nf3
E11 Bogo-Indian Defense 1 d4,Nf6,c4,e6,Nf3,Bb4+
A51 Budapest Gambit 2 d4,Nf6,c4,e5
B10 Caro-Kann Defense 10 e4,c6
E00 Catalan Opening 10 d4,Nf6,c4,e6
C22 Center Game 1 e4,e5,d4,exd4,Qxd4,Nc6
D05 Colle System 1 d4,d5,Nf3,Nf6,e3,e6
A56 Czech Benoni Defense 1 d4,Nf6,c4,c5
A80 Dutch Defense 20 d4,f5
A10 English Opening 28 c4
A40 Englund Gambit 1 d4
C47 Four Knights' Opening 3 e4,e5,Nf3,Nc6,Nc3,Nf6,d4
C00 French Defense 21 e4,e6
D02 Gruenfeld Reversed Opening 1 d4,d5,Nf3
D70 Grunfeld Defense 30 d4,Nf6,c4,g6,f3,d5
C50 Guioco Piano 8 e4,e5,Nf3,Nc6,Bc4
C53 Italian Game (Guioco Piano) 2 e4,e5,Nf3,Nc6,Bc4,Bc5,c3
C30 King's Gambit 10 e4,e5,f4
A04 King's Indian Attack 6 Nf3
E60 King's Indian Defense 40 d4,Nf6,c4,g6
A01 Larsen Attack 1 b3
C40 Latvian Gambit 1 e4,e5,Nf3
A60 Modern Benoni Defense 20 d4,Nf6,c4,c5,d5,e6
A41 Modern Defense 3 d4,d6
E20 Nimzo-Indian Defense 40 d4,Nf6,c4,e6,Nc3,Bb4
B00 Nimzowitsch Defense; Owens Defense 1 e4
C21 Nordic Gambit 1 e4,e5,d4,exd4
A43 Old Benoni Defense 2 d4,c5
A53 Old Indian Defense 3 d4,Nf6,c4,d6
C41 Philidor's Defense 1 e4,e5,Nf3,d6
B07 Pirc Defense 3 e4,d6,d4,Nf6,Nc3
A00 Polish Opening; Sokolsky's Opening 1 b4
C44 Ponziani Opening 1 e4,e5,Nf3,Nc6
D06 Queen's Gambit 64 d4,d5,c4
A47 Queen's Indian Defense 10 d4,Nf6,Nf3,b6
A46 Queen's Pawn Game 1 d4,Nf6,Nf3
D00 Queen's Pawn Opening 3 d4,d5
A11 Reti Opening 2 c4,c6
C42 Russian (Petroff's) Defense 2 e4,e5,Nf3,Nf6
C61 Ruy Lopez 34 e4,e5,Nf3,Nc6,Bb5,Nd4
B01 Scandinavian Defense 1 e4,d5
C45 Scotch Game 1 e4,e5,Nf3,Nc6,d4,exd4,Nxd4
B20 Sicilian Defense 79 e4,c5
C60 Spanish Opening (Ruy Lopez) 6 e4,e5,Nf3,Nc6,Bb5
C46 Three Knights' Opening 1 e4,e5,Nf3,Nc6,Nc3
A48 Torre Attack 2 d4,Nf6,Nf3,g6
A45 Trompovsky Attack 1 d4,Nf6
D01 Veresov Opening 1 d4,d5,Nc3,Nf6,Bg5
C25 Vienna Game 5 e4,e5,Nc3