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