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| A00 |
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| Polish Opening; Sokolsky's Opening |
| A01 |
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| Larsen Attack |
| A02-A03 |
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| Bird's Opening |
| A03 |
|  Dutch Variation |
| A04-A09 |
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| King's Indian Attack |
| A10 |
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| English Opening |
| A11-A12 |
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| Reti Opening |
| A13-A39 |
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| English Opening |
| A17 |
| Hedgehog Variation |
| A20-A29 |
| Reversed Sicilian |
| A30-A31 |
| Hedgehod Variation |
| A32-A39 |
| Symmetrical Variation |
| A40 |
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| Englund Gambit |
| A41-A42 |
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| Modern Defense |
| A43-A44 |
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| Old Benoni Defense |
| A45 |
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| Trompovsky Attack |
| A46 |
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| Queen's Pawn Game |
| A47 |
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| Queen's Indian Defense |
| A48-A49 |
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| Torre Attack |
| A50 |
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| Queen's Indian Defense |
| A51-A52 |
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| Budapest Gambit |
| A52 |
| Main Line |
| A53-A55 |
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| Old Indian Defense |
| A56 |
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| Czech Benoni Defense |
| A57-A59 |
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| Benko (Volga) Gambit |
| A58 |
| Accepted |
| A60-A79 |
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| Modern Benoni Defense |
| A80-A99 |
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| Dutch Defense |
| A82 |
| Staunton Gambit |
| A83 |
| Mainline |
| A87-A90 |
| Leningrad |
| B00 |
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| Nimzowitsch Defense; Owens Defense |
| B01 |
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| Scandinavian Defense |
| B02-B05 |
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| Alekhine's Defense |
| B03 |
| Four Pawns Attack |
| B06 |
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| Modern Defense |
| B07-B09 |
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| Pirc Defense |
| B08 |
| Classical Variation |
| B09 |
| Austrian Attack |
| B10-B19 |
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| Caro-Kann Defense |
| B11 |
| Two Knights' Defense |
| B12 |
| 3.c5 Attack |
| B14 |
| Panov Attack |
| B20-B99 |
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| 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 |
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| B37-B38 | Maroczy Bind |
| B40 |
| Counter Attack Variation |
| B41-B49 |
| Paulsen Variation |
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| B41-B43 | Kan System |
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| B44 | Taimanov System |
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| B45 | Classical System |
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| B46-B47 | Taimanov 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 |
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| B72 | Classical System |
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| B76-B78 | Yugoslav Attack |
| B80-B89 |
| Scheveningen Variation |
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| B81 | Keres System |
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| B86-B87 | Fischer/Sozin System |
| B90-B99 |
| Najdorf Variation |
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| B96 | Goteborg System |
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| B97 | Poisoned Pawn System |
| C00-C20 |
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| French Defense |
| C01 |
| Exchange Variation |
| C02 |
| Advance Variation |
| C03-C09 |
| Tarrasch Variation |
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| C03 | 3.... a6 System |
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| C04 | 3.... Bc6 System |
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| C05-C06 | 3.... Nf6 System |
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| C07-C09 | 3.... c5 System |
| C10 |
| Rubinstein Variation |
| C11 |
| Steinitz Variation |
| C12 |
| MacCutcheon Variation |
| C15-C20 |
| Winawer Variation |
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| C15 | Lapus Manus System |
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| C17 | Swiss System |
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| C18 | Main Line |
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| C19 | Advance, 6. ... Ne7 |
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| C20 | Exchange System |
| C21 |
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| Nordic Gambit |
| C22 |
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| Center Game |
| C23-C24 |
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| Bishop's Opening |
| C25-C29 |
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| Vienna Game |
| C30-C39 |
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| 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 |
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| Latvian Gambit |
| C41 |
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| Philidor's Defense |
| C42-C43 |
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| Russian (Petroff's) Defense |
| C44 |
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| Ponziani Opening |
| C45 |
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| Scotch Game |
| C46 |
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| Three Knights' Opening |
| C47-C49 |
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| Four Knights' Opening |
| C50-C59 |
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| Italian Game (Giuoco Piano) |
| C50 |
| Hungarian Defense |
| C51-C52 |
| Evans Gambit |
| C55 |
| Two Knights' Defense |
| C56 |
| Max Lange Attack |
| C57-C59 |
| Two Knights' Defense |
| C60-C99 |
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| 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 |
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| C80 | Bernstein System |
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| C81 | Keres System |
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| 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 |
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| Queen's Pawn Opening |
| D01 |
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| Veresov Opening |
| D02 |
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| Gruenfeld Reversed Opening |
| D03 |
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| Torre attack (Tartakower variation) |
| D04 |
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| Queen's pawn game |
| D05 |
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| Colle System |
| D06-D69 |
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| Queen's Gambit |
| D07 |
| Tchigorin Variation |
| D08-D09 |
| Albin Counter Gambit |
| D10-D19 |
| Slav Defense |
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| D14 | Exchange System |
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| D15 | Geller Gambit |
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| D17 | Czech System |
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| D18 | Main Line |
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| D19 | Euwe System |
| D20-D29 |
| Accepted |
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| D21 | Borsenko-Furman System |
| D30-D69 |
| Declined |
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| D31 | Alatortsev System |
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| D32-D33 | Tarrasch System |
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| D34 | Rubinstein System |
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| D35-D36 | Exchange System |
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| D37 | 5.Bf4 System |
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| D38-D39 | Ragozin Defense |
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| D40-D42 | Semi-Tarrasch Defense |
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| D43 | Semi-Slav Defense |
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| D44-D45 | Anti-Meran Defense |
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| D46 | Semi-Slav Defense |
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| D47-D49 | Meran Defense |
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| D51-D52 | Cambridge Springs Defense |
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| D53-D54 | Orthodox Defense |
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| D55 | Anti-Tartakower System |
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| D56 | Lasker System |
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| D57 | Modern System |
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| D58-D59 | Tartakower System |
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| D60-D62 | Orthodox Defense |
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| D63-D66 | Blackburne System |
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| D67 | Capablanca System |
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| D68 | Blackburne System |
| D70-D99 |
| Grunfeld Defense |
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| D71 | Neo-Grunfeld Variation |
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| D76 | Orthodox Fianchetto Variation |
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| D79 | Slav Variation |
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| D82-D84 | Bf4 System |
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| D85 | Modern Exchange Variation |
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| D87 | Botvinnik Exchange Variation |
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| D89 | Exchange Variation |
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| D93 | Bg3 System |
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| D94-D95 | Closed Variation |
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| D96 | Russian Variation |
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| D97 | Ragozin Variation (Classical) |
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| D99 | Ragozin Variation (Smyslov) |
| E00-E09 |
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| Catalan Opening |
| E04-E05 |
| Open Variation |
| E06-E09 |
| Closed Variation |
| E10 |
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| Blumenfeld Gambit |
| E11 |
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| Bogo-Indian Defense |
| E12-E19 |
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| Queen's Indian Defense |
| E15 |
| Accelerated Fianchetto Variation |
| E16 |
| Bogo Variation |
| E20-E59 |
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| 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 |
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| King's Indian Defense |
| E62-E70 |
| Fianchetto Variation |
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| E62-E63 | Panno System |
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| E65-E66 | Yugoslav System |
| E73-E74 |
| Averbach Variation |
| E76-E79 |
| Four Pawns' Variation |
| E80-E89 |
| Classical Variation |
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| E81 | Saemisch (Byrne) System |
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| E83 | Panov System |
| E92 |
| Exchange Variation |
| E93 |
| Petrosian Variation |
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