ECO Codes
A00 Polish Opening; Sokolsky's Opening
A01 Larsen Attack
A02-A03 Bird's Opening
A03 Dutch Variation
A04-A09 King's Indian Attack
A10 English Opening
A11-A12 Reti Opening
A13-A39 English Opening
A17 Hedgehog Variation
A20-A29 Reversed Sicilian
A30-A31 Hedgehod Variation
A32-A39 Symmetrical Variation
A40 Englund Gambit
A41-A42 Modern Defense
A43-A44 Old Benoni Defense
A45 Trompovsky Attack
A46 Queen's Pawn Game
A47 Queen's Indian Defense
A48-A49 Torre Attack
A50 Queen's Indian Defense
A51-A52 Budapest Gambit
A52 Main Line
A53-A55 Old Indian Defense
A56 Czech Benoni Defense
A57-A59 Benko (Volga) Gambit
A58 Accepted
A60-A79 Modern Benoni Defense
A80-A99 Dutch Defense
A82 Staunton Gambit
A83 Mainline
A87-A90 Leningrad
B00 Nimzowitsch Defense; Owens Defense
B01 Scandinavian Defense
B02-B05 Alekhine's Defense
B03 Four Pawns Attack
B06 Modern Defense
B07-B09 Pirc Defense
B08 Classical Variation
B09 Austrian Attack
B10-B19 Caro-Kann Defense
B11 Two Knights' Defense
B12 3.c5 Attack
B14 Panov Attack
B20-B99 Sicilian Defense
B21 Morra Gambit; Grand Prix Attack
B22 Alapin Variation
B23-B26 Closed Variation
B29 Rubinstein Variation
B30-B31 Rossolimo Variation
B32 Lowenthal Hunting Variation
B33 Sveshnikov Variation
B34-B39 Accelerated Dragon Variation
B37-B38 Maroczy Bind
B40 Counter Attack Variation
B41-B49 Paulsen Variation
B41-B43 Kan System
B44 Tiamanov System
B45 Classical System
B46-B47 Tiamanov System
B50 Kopec Variation
B51-B52 Rossolimo Variation
B53 Hungarian Variation
B55 Anti-Dragon Variation
B57 Sozin-Benko Variation
B58 Boleslavsky Variation
B60-B69 Richter Rauzer Attack
B70-B79 Dragon Variation
B72 Classical System
B76-B78 Yugoslav Attack
B80-B89 Scheveningen Variation
B81 Keres System
B86-B87 Fischer/Sozin System
B90-B99 Najdorf Variation
B96 Goteborg System
B97 Poisoned Pawn System
C00-C20 French Defense
C01 Exchange Variation
C02 Advance Variation
C03-C09 Tarrasch Variation
C03 3.... a6 System
C04 3.... Bc6 System
C05-C06 3.... Nf6 System
C07-C09 3.... c5 System
C10 Rubinstein Variation
C11 Steinitz Variation
C12 MacCutcheon Variation
C15-C20 Winawer Variation
C15 Lapus Manus System
C17 Swiss System
C18 Main Line
C20 Exchange System
C21 Nordic Gambit
C22 Center Game
C23-C24 Bishop's Opening
C25-C29 Vienna Game
C30-C30 King's Gambit
C31-C32 Falkbeer Counter Gambit
C33 Keres Variation
C35 Cunningham Variation
C36 Modern Variation
C37 Muzio Gambit
C38 Greco & Philidor Gambits
C39 Allagier & Kiesertisky Gambits
C40 Latvian Gambit
C41 Philidor's Defense
C42-C43 Russian (Petroff's) Defense
C44 Ponziani Opening
C45 Scotch Game
C46 Three Knights' Opening
C47-C49 Four Knights' Opening
C50-C59 Italian Game (Guioco Piano)
C50 Hungarian Defense
C51-C52 Evans Gambit
C55 Two Knights' Defense
C56 Max Lange Attack
C57-C59 Two Knights' Defense
C60-C99 Spanish Opening (Ruy Lopez)
C61 Bird's Defense
C62 Old Steinitz Defense
C63 Schliemann Gambit
C64 Cordel Defense
C65 Berlin Defense
C66 Modern Steinitz Defense
C67 Rio de Janerio Defense
C68-C69 Exchange Variation
C71-C76 Modern Steinitz Defense
C77 Anderssen Variation
C78 Archangel Variation; Moeller Attack
C79 Russian Variation
C80-C83 Open Variation
C80 Bernstein System
C81 Keres System
C83 Main Line
C84 Center Attack
C85 Delayed Defered Exchange Variation
C86 Worral Attack
C88 Marshall Gambit
C92 Zaitsev Variation
C93 Smyslov Variation
C94-C95 Breyer Variation
C96-C99 Tchigorin
D00 Queen's Pawn Opening
D01 Veresov Opening
D02 Gruenfeld Reversed Opening
D03
D04
D05 Colle System
D06-D69 Queen's Gambit
D07 Tchigorin Variation
D08-D09 Albin Counter Gambit
D10-D19 Slav Defense
D14 Exchange System
D15 Geller Gambit
D17 Czech System
D18 Main Line
D19 Euwe System
D20-D29 Accepted
D21 Borsenko-Furman System
D30-D69 Declined
D31 Alatortsev System
D32-D33 Tarrasch System
D34 Rubinstein System
D35-D36 Exchange System
D37 5.Bf4 System
D38-D39 Ragozin Defense
D40-D42 Semi-Tarrasch Defense
D43 Semi-Slav Defense
D44-D45 Anti-Meran Defense
D46 Semi-Slav Defense
D47-D49 Meran Defense
D51-D52 Cambridge Springs Defense
D53-D54 Orthodox Defense
D55 Anti-Tartakower System
D56 Lasker System
D57 Modern System
D58-D59 Tartakower System
D60-D62 Orthodox Defense
D63-D66 Blackburne System
D67 Capablanca System
D68 Blackburne System
D70-D99 Grunfeld Defense
D71 Neo-Grunfeld Variation
D76 Orthodox Fianchetto Variation
D79 Slav Variation
D82-D84 Bf4 System
D85 Modern Exchange Variation
D87 Botvinnik Exchange Variation
D89 Exchange Variation
D93 Bg3 System
D94-D95 Closed Variation
D96 Russian Variation
D97 Ragozin Variation (Classical)
D99 Ragozin Variation (Smyslov)
E00-E09 Catalan Opening
E04-E05 Open Variation
E06-E09 Closed Variation
E10 Blumenfeld Gambit
E11 Bogo-Indian Defense
E12-E19 Queen's Indian Defense
E15 Accelerated Fianchetto Variation
E16 Bogo Variation
E20-E59 Nimzo-Indian Defense
E24-E29 Saemisch Variation
E30-E31 Leningrad Variation
E32-E39 Classical Variation
E41-E42 Huebner Variation
E43-E46 Nimzowitsch Variation
E47-E49 Rubinstein Variation
E50-E59 Modern Variation
E60-E99 King's Indian Defense
E62-E70 Fianchetto Variation
E62-E63 Panno System
E65-E66 Yugoslav System
E73-E74 Averbach Variation
E76-E79 Four Pawns' Variation
E80-E89 Classical Variation
E81 Saemisch (Byrne) System
E83 Panov System
E92 Exchange Variation
E93 Petrosian Variation