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Directory ECO codes     (chess openings)   A00     Polish (Sokolsky) opening   A00     Polish : Tuebingen variation   A00     Polish : Outflank variation   A00     Benko's Opening   A00     Lasker simul special   A00     Benko's Opening : reversed Alekhine   A00     Grob's attack   A00     Grob : Spike attack   A00     Grob : Fritz gambit   A00     Grob : Romford counter-gambit   A00     Clemenz (Mead's, Basman's or de Klerk's) Opening   A00     Global Opening   A00     Amar (Paris) Opening   A00     Amar gambit   A00     Dunst (Sleipner, Heinrichsen) Opening   A00     Dunst (Sleipner-Heinrichsen) Opening   A00     Battambang Opening   A00     Novosibirsk Opening   A00     Anderssen's Opening   A00     Ware (Meadow Hay) Opening   A00     Crab Opening   A00     Saragossa Opening   A00     Mieses Opening   A00     Mieses Opening   A00     Valencia Opening   A00     Venezolana Opening   A00     Van't Kruijs Opening   A00     Amsterdam attack   A00     Gedult's Opening   A00     Hammerschlag (Fried fox/Pork chop Opening)   A00     Anti-Borg (Desprez) Opening   A00     Durkin's attack   A01     Nimzovich-Larsen attack   A01     Nimzovich-Larsen attack : Modern variation   A01     Nimzovich-Larsen attack : Indian variation   A01     Nimzovich-Larsen attack : Classical variation   A01     Nimzovich-Larsen attack : English variation   A01     Nimzovich-Larsen attack : Dutch variation   A01     Nimzovich-Larsen attack : Polish variation   A01     Nimzovich-Larsen attack : Symmetrical variation   A02     Bird's Opening   A02     Bird : From gambit   A02     Bird : From gambit, Lasker variation   A02     Bird : From gambit, Lipke variation   A02     Bird's Opening, Swiss gambit   A02     Bird : Hobbs gambit   A03     Bird's Opening   A03     Mujannah Opening   A03     Bird's Opening : Williams gambit   A03     Bird's Opening : Lasker variation   A04     Reti Opening   A04     Reti v Dutch   A04     Reti : Pirc-Lisitsin gambit   A04     Reti : Lisitsin gambit deferred   A04     Reti Opening   A04     Reti : Wade defense   A04     Reti : Herrstroem gambit   A05     Reti Opening   A05     Reti : King's Indian attack, Spassky's variation   A05     Reti : King's Indian attack   A05     Reti : King's Indian attack, Reti-Smyslov variation   A06     Reti Opening   A06     Reti : Old Indian attack   A06     Santasiere's folly   A06     Tennison (Lemberg, Zukertort) gambit   A06     Reti : Nimzovich-Larsen attack   A07     Reti : King's Indian attack (Barcza system)   A07     Reti : King's Indian attack, Yugoslav variation   A07     Reti : King's Indian attack, Keres variation   A07     Reti : King's Indian attack   A07     Reti : King's Indian attack, Pachman system   A07     Reti : King's Indian attack (with ...c5)   A08     Reti : King's Indian attack   A08     Reti : King's Indian attack, French variation   A09     Reti Opening   A09     Reti : Advance variation   A09     Reti accepted   A09     Reti accepted : Keres variation   A10     English Opening   A10     English Opening   A10     English : Adorjan defense   A10     English : Jaenisch gambit   A10     English : Anglo-Dutch defense   A11     English : Caro-Kann defensive system   A12     English : Caro-Kann defensive system   A12     English : Torre defensive system   A12     English : London defensive system   A12     English : Caro-Kann defensive system   A12     English : Bled variation   A12     English : New York (London) defensive system   A12     English : Capablanca's variation   A12     English : Caro-Kann defensive system, Bogoljubov variation   A13     English Opening   A13     English : Romanishin gambit   A13     English Opening : Agincourt variation   A13     English : Wimpey system   A13     English Opening : Agincourt variation   A13     English : Kurajica defense   A13     English : Neo-Catalan   A13     English : Neo-Catalan accepted   A14     English : Neo-Catalan declined   A14     English : Symmetrical, Keres defense   A15     English, 1...Nf6 (Anglo-Indian defense)   A15     English orang-utan   A15     English Opening   A16     English Opening   A16     English : Anglo-Gruenfeld defense   A16     English : Anglo-Gruenfeld, Smyslov defense   A16     English : Anglo-Gruenfeld, Czech defense   A16     English : Anglo-Gruenfeld defense   A16     English : Anglo-Gruenfeld defense, Korchnoi variation   A17     English Opening   A17     English : Queens Indian formation   A17     English : Queens Indian, Romanishin variation   A17     Variation Nimzo-English Opening : Nimzo-English Opening   A18     English : Mikenas-Carls variation   A18     English : Mikenas-Carls, Flohr variation   A18     English : Mikenas-Carls, Kevitz variation   A19     English : Mikenas-Carls, Sicilian variation   A20     English Opening   A20     English, Nimzovich variation   A20     English, Nimzovich, Flohr variation   A21     English Opening   A21     English, Troeger defense   A21     English, Keres variation   A21     English Opening   A21     English, Smyslov defense   A21     English, Kramnik-Shirov counterattack   A22     English Opening   A22     English : Bellon gambit   A22     English : Carls' Bremen system   A22     English : Bremen, reverse Dragon   A22     English : Bremen, Smyslov system   A23     English : Bremen system, Keres variation   A24     English : Bremen system with ...g6   A25     English : Sicilian Reversed   A25     English : Closed system   A25     English : Closed, Taimanov variation   A25     English : Closed, Hort variation   A25     English : Closed, 5.Rb1   A25     English : Closed, 5.Rb1 Taimanov variation   A25     English : Closed system (without ...d6)   A26     English : Closed system   A26     English : Botvinnik system   A27     English : Three knights system   A28     English : Four knights system   A28     English : Nenarokov variation   A28     English : Bradley Beach variation   A28     English : Four knights, Nimzovich variation   A28     English : Four knights, Marini variation   A28     English : Four knights, Capablanca variation   A28     English : Four knights, 4.e3   A28     English : Four knights, Stean variation   A28     English : Four knights, Romanishin variation   A29     English : Four knights, kingside Fianchetto   A30     English : Symmetrical variation   A30     English : Symmetrical, hedgehog system   A30     English : Symmetrical, hedgehog, flexible formation   A31     English : Symmetrical, Benoni formation   A32     English : Symmetrical variation   A33     English : Symmetrical variation   A33     English : Symmetrical, Geller variation   A34     English : Symmetrical variation   A34     English : Symmetrical, Three knights system   A34     English : Symmetrical variation   A34     English : Symmetrical, Rubinstein system   A35     English : Symmetrical variation   A35     English : Symmetrical, Four knights system   A36     English : Symmetrical variation   A36     English : ultra-Symmetrical variation   A36     English : Symmetrical, Botvinnik system Reversed   A36     English : Symmetrical, Botvinnik system   A37     English : Symmetrical variation   A37     English : Symmetrical, Botvinnik system Reversed   A38     English : Symmetrical variation   A38     English : Symmetrical, Main line with d3   A38     English : Symmetrical, Main line with b3   A39     English : Symmetrical, Main line with d4   A40     Queen's pawn   A40     Queen's pawn : Lundin (Kevitz-Mikenas) defense   A40     Queen's pawn : Charlick (Englund) gambit   A40     Queen's pawn : Englund gambit   A40     Queen's pawn : English defense   A40     Polish defense   A40     Queen's pawn   A40     Queen's pawn : Keres defense   A40     Queen's pawn : Franco-Indian (Keres) defense   A40     Modern defense   A40     Beefeater defense   A41     Queen's Pawn   A41     Old Indian : Tartakower (Wade) variation   A41     Old Indian defense   A41     Modern defense   A41     Robatsch defense : Rossolimo variation   A42     Modern defense : Averbakh system   A42     Pterodactyl defense   A42     Modern defense : Averbakh system, Randspringer variation   A42     Modern defense : Averbakh system, Kotov variation   A43     Old Benoni defense   A43     Old Benoni : Franco-Benoni defense   A43     Old Benoni : Mujannah formation   A43     Old Benoni defense   A43     Woozle defense   A43     Old Benoni defense   A43     Hawk (Habichd) defense   A43     Old Benoni defense   A43     Old Benoni : Schmid's system   A44     Old Benoni defense   A44     Semi-Benoni (`blockade variation')   A45     Queen's pawn game   A45     Queen's pawn : Bronstein gambit   A45     Canard Opening   A45     Paleface attack   A45     Blackmar-Diemer gambit   A45     Gedult attack   A45     Trompowsky attack (Ruth, Opovcensky Opening)   A46     Queen's pawn game   A46     Queen's pawn : Torre attack   A46     Queen's pawn : Torre attack, Wagner gambit   A46     Queen's pawn : Yusupov-Rubinstein system   A46     Doery defense   A47     Queen's Indian defense   A47     Queen's Indian : Marienbad system   A47     Queen's Indian : Marienbad system, Berg variation   A48     King's Indian : East Indian defense   A48     King's Indian : Torre attack   A48     King's Indian : London system   A49     King's Indian : Fianchetto without c4   A50     Queen's pawn game   A50     Kevitz-Trajkovich defense   A50     Queen's Indian Accelerated   A51     Budapest defense declined   A51     Budapest : Fajarowicz variation   A51     Budapest : Fajarowicz, Steiner variation   A52     Budapest defense   A52     Budapest : Adler variation   A52     Budapest : Rubinstein variation   A52     Budapest : Alekhine variation   A52     Budapest : Alekhine, Abonyi variation   A52     Budapest : Alekhine variation, Balogh gambit   A53     Old Indian defense   A53     Old Indian : Janowski variation   A54     Old Indian : Ukrainian variation   A54     Old Indian : Dus-Khotimirsky variation   A54     Old Indian : Ukrainian variation, 4.Nf3   A55     Old Indian : Main line   A56     Benoni defense   A56     Benoni defense, Hromodka system   A56     Vulture defense   A56     Czech Benoni defense   A56     Czech Benoni : King's Indian system   A57     Benko gambit   A57     Benko gambit half accepted   A57     Benko gambit : Zaitsev system   A57     Benko gambit : Nescafe Frappe attack   A58     Benko gambit accepted   A58     Benko gambit : Nd2 variation   A58     Benko gambit : Fianchetto variation   A59     Benko gambit : 7.e4   A59     Benko gambit : Ne2 variation   A59     Benko gambit   A59     Benko gambit : Main line   A60     Benoni defense   A61     Benoni defense   A61     Benoni : Uhlmann variation   A61     Benoni : Nimzovich (knight's tour) variation   A61     Benoni : Fianchetto variation   A62     Benoni : Fianchetto variation   A63     Benoni : Fianchetto, 9...Nbd7   A64     Benoni : Fianchetto, 11...Re8   A65     Benoni : 6.e4   A66     Benoni : pawn storm variation   A66     Benoni : Mikenas variation   A67     Benoni : Taimanov variation   A68     Benoni : Four pawns attack   A69     Benoni : Four pawns attack, Main line   A70     Benoni : Classical with e4 and Nf3   A70     Benoni : Classical without 9.O-O   A71     Benoni : Classical, 8.Bg5   A72     Benoni : Classical without 9.O-O   A73     Benoni : Classical, 9.O-O   A74     Benoni : Classical, 9...a6, 10.a4   A75     Benoni : Classical with ...a6 and 10...Bg4   A76     Benoni : Classical, 9...Re8   A77     Benoni : Classical, 9...Re8, 10.Nd2   A78     Benoni : Classical with ...Re8 and ...Na6   A79     Benoni : Classical, 11.f3   A80     Dutch   A80     Dutch, Spielmann gambit   A80     Dutch, Manhattan (Alapin, Ulvestad) variation   A80     Dutch, Von Pretzel gambit   A80     Dutch, Korchnoi attack   A80     Dutch, Krejcik gambit   A80     Dutch, 2.Bg5 variation   A81     Dutch defense   A81     Dutch defense, Blackburne variation   A81     Dutch defense   A81     Dutch : Leningrad, Basman system   A81     Dutch : Leningrad, Karlsbad variation   A82     Dutch : Staunton gambit   A82     Dutch : Balogh defense   A82     Dutch : Staunton gambit   A82     Dutch : Staunton gambit, Tartakower variation   A83     Dutch : Staunton gambit, Staunton's line   A83     Dutch : Staunton gambit, Alekhine variation   A83     Dutch : Staunton gambit, Lasker variation   A83     Dutch : Staunton gambit, Chigorin variation   A83     Dutch : Staunton gambit, Nimzovich variation   A84     Dutch defense   A84     Dutch defense : Bladel variation   A84     Dutch defense   A84     Dutch defense, Rubinstein variation   A84     Dutch : Staunton gambit deferred   A84     Dutch defense   A85     Dutch with c4 & Nc3   A86     Dutch with c4 & g3   A86     Dutch : Hort-Antoshin system   A86     Dutch : Leningrad variation   A87     Dutch : Leningrad, Main variation   A88     Dutch : Leningrad, Main variation with c6   A89     Dutch : Leningrad, Main variation with Nc6   A90     Dutch defense   A90     Dutch defense : Dutch-Indian (Nimzo-Dutch) variation   A90     Dutch-Indian, Alekhine variation   A91     Dutch defense   A92     Dutch defense   A92     Dutch defense, Alekhine variation   A92     Dutch : Stonewall variation   A92     Dutch : Stonewall with Nc3   A93     Dutch : Stonewall, Botwinnik variation   A94     Dutch : Stonewall with Ba3   A95     Dutch : Stonewall with Nc3   A95     Dutch : Stonewall: Chekhover variation   A96     Dutch : Classical variation   A97     Dutch : Ilyin-Genevsky variation   A97     Dutch : Ilyin-Genevsky, Winter variation   A98     Dutch : Ilyin-Genevsky variation with Qc2   A99     Dutch : Ilyin-Genevsky variation with b3   B00     King's pawn Opening   B00     Hippopotamus defense   B00     Corn stalk defense   B00     Lemming defense   B00     Fred   B00     Barnes defense   B00     Fried fox defense   B00     Carr's defense   B00     Reversed Grob (Borg/Basman defense/macho Grob)   B00     St. George (Baker) defense   B00     Owen defense   B00     Guatemala defense   B00     KP : Nimzovich defense   B00     KP : Nimzovich defense, Wheeler gambit   B00     KP : Nimzovich defense   B00     KP : Colorado counter   B00     KP : Nimzovich defense   B00     KP : Nimzovich defense, Marshall gambit   B00     KP : Nimzovich defense, Bogolyubov variation   B00     KP : Neo-Mongoloid defense   B01     Scandinavian (centre counter) defense   B01     Scandinavian defense, Lasker variation   B01     Scandinavian defense   B01     Scandinavian defense, Gruenfeld variation   B01     Scandinavian : Anderssen counter-attack   B01     Scandinavian : Anderssen counter-attack Orthodox attack   B01     Scandinavian : Anderssen counter-attack, Goteborg system   B01     Scandinavian : Anderssen counter-attack, Collijn variation   B01     Scandinavian, Mieses-Kotrvc gambit   B01     Scandinavian : Pytel-Wade variation   B01     Scandinavian defense   B01     Scandinavian : Icelandic gambit   B01     Scandinavian gambit   B01     Scandinavian defense   B01     Scandinavian : Marshall variation   B01     Scandinavian : Kiel variation   B01     Scandinavian : Richter variation   B02     Alekhine's defense   B02     Alekhine's defense : Scandinavian variation   B02     Alekhine's defense : Spielmann variation   B02     Alekhine's defense : Maroczy variation   B02     Alekhine's defense : Krejcik variation   B02     Alekhine's defense : Mokele Mbembe (Buecker) variation   B02     Alekhine's defense : Brooklyn defense   B02     Alekhine's defense   B02     Alekhine's defense : Kmoch variation   B02     Alekhine's defense : Saemisch attack   B02     Alekhine's defense : Welling variation   B02     Alekhine's defense   B02     Alekhine's defense : Steiner variation   B02     Alekhine's defense : Two pawns' (Lasker's) attack   B02     Alekhine's defense : Two pawns' attack, Mikenas variation   B03     Alekhine's defense   B03     Alekhine's defense : O'Sullivan gambit   B03     Alekhine's defense   B03     Alekhine's defense : Balogh variation   B03     Alekhine's defense   B03     Alekhine's defense : Exchange variation   B03     Alekhine's defense : Exchange, Karpov variation   B03     Alekhine's defense : Four pawns attack   B03     Alekhine's defense : Four pawns attack, Korchnoi variation   B03     Alekhine's defense : Four pawns attack, 6...Nc6   B03     Alekhine's defense : Four pawns attack, Ilyin-Genevsky var.   B03     Alekhine's defense : Four pawns attack, 7.Be3   B03     Alekhine's defense : Four pawns attack, Tartakower variation   B03     Alekhine's defense : Four pawns attack, Planinc variation   B03     Alekhine's defense : Four pawns attack, Fianchetto variation   B03     Alekhine's defense : Four pawns attack, Trifunovic variation   B04     Alekhine's defense : Modern variation   B04     Alekhine's defense : Modern, Larsen variation   B04     Alekhine's defense : Modern, Schmid variation   B04     Alekhine's defense : Modern, Fianchetto variation   B04     Alekhine's defense : Modern, Keres variation   B05     Alekhine's defense : Modern variation, 4...Bg4   B05     Alekhine's defense : Modern, Flohr variation   B05     Alekhine's defense : Modern, Panov variation   B05     Alekhine's defense : Modern, Alekhine variation   B05     Alekhine's defense : Modern, Vitolins attack   B06     Robatsch (Modern) defense   B06     Norwegian defense   B06     Robatsch (Modern) defense   B06     Robatsch defense : Three pawns attack   B06     Robatsch defense   B06     Robatsch defense : Gurgenidze variation   B06     Robatsch (Modern) defense   B06     Robatsch defense : Two knights variation   B06     Robatsch defense : Two knights, Suttles variation   B06     Robatsch defense : Pseudo-Austrian attack   B07     Pirc defense   B07     Pirc : Ufimtsev-Pytel variation   B07     Pirc defense   B07     Pirc : 150 attack   B07     Pirc : Sveshnikov system   B07     Pirc : Holmov system   B07     Pirc : Byrne variation   B07     Pirc defense   B07     Pirc : Chinese variation   B07     Pirc : bayonet (Mariotti) attack   B07     Robatsch defense : Geller's system   B08     Pirc : Classical (Two knights) system   B08     Pirc : Classical (Two knights) system   B08     Pirc : Classical, h3 system   B08     Pirc : Classical system, 5.Be2   B09     Pirc : Austrian attack   B09     Pirc : Austrian attack   B09     Pirc : Austrian attack, 6.e5   B09     Pirc : Austrian attack, 6.Be3   B09     Pirc : Austrian attack, 6.Bd3   B09     Pirc : Austrian attack, Dragon formation   B09     Pirc : Austrian attack, Ljubojevic variation   B10     Caro-Kann defense   B10     Caro-Kann : Hillbilly attack   B10     Caro-Kann : Anti-Caro-Kann defense   B10     Caro-Kann : Anti-anti-Caro-Kann defense   B10     Caro-Kann : Closed (Breyer) variation   B10     Caro-Kann defense   B10     Caro-Kann : GOldman (Spielmann) variation   B10     Caro-Kann : Two knights variation   B11     Caro-Kann : Two knights, 3...Bg4   B12     Caro-Kann defense   B12     de Bruycker defense   B12     Caro-Masi defense   B12     Caro-Kann defense   B12     Caro-Kann : Tartakower (fantasy) variation   B12     Caro-Kann : 3.Nd2   B12     Caro-Kann : Edinburgh variation   B12     Caro-Kann : Advance variation   B12     Caro-Kann : Advance, Short variation   B13     Caro-Kann : Exchange variation   B13     Caro-Kann : Exchange, Rubinstein variation   B13     Caro-Kann : Panov-Botvinnik attack   B13     Caro-Kann : Panov-Botvinnik, Gunderam attack   B13     Caro-Kann : Panov-Botvinnik attack   B13     Caro-Kann : Panov-Botvinnik, Herzog defense   B13     Caro-Kann : Panov-Botvinnik, normal variation   B13     Caro-Kann : Panov-Botvinnik, Czerniak variation   B13     Caro-Kann : Panov-Botvinnik, Reifir (Spielmann) variation   B14     Caro-Kann : Panov-Botvinnik attack, 5...e6   B14     Caro-Kann : Panov-Botvinnik attack, 5...g6   B15     Caro-Kann defense   B15     Caro-Kann : Gurgenidze counter-attack   B15     Caro-Kann : Gurgenidze system   B15     Caro-Kann : Rasa-Studier gambit   B15     Caro-Kann defense   B15     Caro-Kann : Alekhine gambit   B15     Caro-Kann : Tartakower (Nimzovich) variation   B15     Caro-Kann : Forgacs variation   B16     Caro-Kann : Bronstein-Larsen variation   B17     Caro-Kann : Steinitz variation   B18     Caro-Kann : Classical variation   B18     Caro-Kann : Classical, Flohr variation   B18     Caro-Kann : Classical, Maroczy attack   B18     Caro-Kann : Classical, 6.h4   B19     Caro-Kann : Classical, 7...Nd7   B19     Caro-Kann : Classical, Spassky variation   B20     Sicilian defense   B20     Sicilian : Gloria variation   B20     Sicilian : Steinitz variation   B20     Sicilian : wing gambit   B20     Sicilian : wing gambit, Santasiere variation   B20     Sicilian : wing gambit, Marshall variation   B20     Sicilian : wing gambit, Marienbad variation   B20     Sicilian : wing gambit, Carlsbad variation   B20     Sicilian : Keres variation (2.Ne2)   B21     Sicilian : Grand Prix attack   B21     Sicilian : Smith-Morra gambit   B21     Sicilian : Andreaschek gambit   B21     Sicilian : Smith-Morra gambit   B21     Sicilian : Smith-Morra gambit, Chicago defense   B22     Sicilian : Alapin's variation (2.c3)   B22     Sicilian : 2.c3, Heidenfeld variation   B23     Sicilian : Closed   B23     Sicilian : Closed, Korchnoi variation   B23     Sicilian : Closed, 2...Nc6   B23     Sicilian : chameleon variation   B23     Sicilian : Grand Prix attack   B23     Sicilian : Grand Prix attack, Schofman variation   B24     Sicilian : Closed   B24     Sicilian : Closed, Smyslov variation   B25     Sicilian : Closed   B25     Sicilian : Closed, 6.Ne2 e5 (Botvinnik)   B25     Sicilian : Closed, 6.f4   B25     Sicilian : Closed, 6.f4 e5 (Botvinnik)   B26     Sicilian : Closed, 6.Be3   B27     Sicilian defense   B27     Sicilian : Stiletto (Althouse) variation   B27     Sicilian : Quinteros variation   B27     Sicilian : Katalimov variation   B27     Sicilian : Hungarian variation   B27     Sicilian : Acton extension   B28     Sicilian : O'Kelly variation   B29     Sicilian : Nimzovich-Rubinstein variation   B29     Sicilian : Nimzovich-Rubinstein; Rubinstein counter-gambit   B30     Sicilian defense   B30     Sicilian : Nimzovich-Rossolimo attack (without ...d6)   B31     Sicilian : Nimzovich-Rossolimo attack (with ...g6, without ...d6)   B31     Sicilian : Nimzovich-Rossolimo attack, Gurgenidze variation   B32     Sicilian defense   B32     Sicilian : Flohr variation   B32     Sicilian : Nimzovich variation   B32     Sicilian : Labourdonnais-Loewenthal variation   B32     Sicilian : Labourdonnais-Loewenthal (Kalashnikov) variation   B33     Sicilian defense   B33     Sicilian : Pelikan (Lasker/Sveshnikov) variation   B33     Sicilian : Pelikan, Bird variation   B33     Sicilian : Pelikan, Chelyabinsk variation   B33     Sicilian : Sveshnikov variation   B34     Sicilian : Accelerated Fianchetto, Exchange variation   B34     Sicilian : Accelerated Fianchetto, Modern variation   B35     Sicilian : Accelerated Fianchetto, Modern variation with Bc4   B36     Sicilian : Accelerated Fianchetto, Maroczy bind   B36     Sicilian : Accelerated Fianchetto, Gurgenidze variation   B37     Sicilian : Accelerated Fianchetto, Maroczy bind, 5...Bg7   B37     Sicilian : Accelerated Fianchetto, Simagin variation   B38     Sicilian : Accelerated Fianchetto, Maroczy bind, 6.Be3   B39     Sicilian : Accelerated Fianchetto, Breyer variation   B40     Sicilian defense   B40     Sicilian : Marshall variation   B40     Sicilian defense   B40     Sicilian : Anderssen variation   B40     Sicilian : Pin variation (Sicilian counter-attack)   B40     Sicilian : Pin, Jaffe variation   B40     Sicilian : Pin, Koch variation   B41     Sicilian : Kan variation   B41     Sicilian : Kan, Maroczy bind (Reti variation)   B41     Sicilian : Kan, Maroczy bind - Bronstein variation   B42     Sicilian : Kan, 5.Bd3   B42     Sicilian : Kan, Gipslis variation   B42     Sicilian : Kan, Polugaievsky variation   B42     Sicilian : Kan, Swiss cheese variation   B43     Sicilian : Kan, 5.Nc3   B44     Sicilian defense   B44     Sicilian, Szen (`anti-Taimanov') variation   B44     Sicilian, Szen, hedgehog variation   B44     Sicilian, Szen variation, Dely-Kasparov gambit   B45     Sicilian : Taimanov variation   B45     Sicilian : Taimanov, American attack   B46     Sicilian : Taimanov variation   B47     Sicilian : Taimanov (Bastrikov) variation   B48     Sicilian : Taimanov variation   B49     Sicilian : Taimanov variation   B50     Sicilian   B50     Sicilian : wing gambit deferred   B51     Sicilian : Canal-Sokolsky (Nimzovich-Rossolimo, Moscow) attack   B52     Sicilian : Canal-Sokolsky attack, 3...Bd7   B52     Sicilian : Canal-Sokolsky attack, Bronstein gambit   B52     Sicilian : Canal-Sokolsky attack, Sokolsky variation   B53     Sicilian, Chekhover variation   B53     Sicilian : Chekhover, Zaitsev variation   B54     Sicilian   B54     Sicilian : Prins (Moscow) variation   B55     Sicilian : Prins variation, Venice attack   B56     Sicilian   B56     Sicilian : Venice attack   B56     Sicilian   B57     Sicilian : Sozin, not Scheveningen   B57     Sicilian : Magnus Smith trap   B57     Sicilian : Sozin, Benko variation   B58     Sicilian : Classical   B58     Sicilian : Boleslavsky variation   B58     Sicilian : Boleslavsky, Louma variation   B59     Sicilian : Boleslavsky variation, 7.Nb3   B60     Sicilian : Richter-Rauzer   B60     Sicilian : Richter-Rauzer, Bondarevsky variation   B60     Sicilian : Richter-Rauzer, Larsen variation   B61     Sicilian : Richter-Rauzer, Larsen variation, 7.Qd2   B62     Sicilian : Richter-Rauzer, 6...e6   B62     Sicilian : Richter-Rauzer, Podvebrady variation   B62     Sicilian : Richter-Rauzer, Margate (Alekhine) variation   B62     Sicilian : Richter-Rauzer, Richter attack   B62     Sicilian : Richter-Rauzer, Keres variation   B63     Sicilian : Richter-Rauzer, Rauzer attack   B63     Sicilian : Richter-Rauzer, Rauzer attack, 7...Be7   B64     Sicilian : Richter-Rauzer, Rauzer attack, 7...Be7 defense, 9.f4   B64     Sicilian : Richter-Rauzer, Rauzer attack, Geller variation   B65     Sicilian : Richter-Rauzer, Rauzer attack, 7...Be7 defense, 9...Nxd4   B65     Sicilian : Richter-Rauzer, Rauzer attack, 7...Be7 defense, 9...Nxd4   B66     Sicilian : Richter-Rauzer, Rauzer attack, 7...a6   B67     Sicilian : Richter-Rauzer, Rauzer attack, 7...a6 defense, 8...Bd7   B68     Sicilian : Richter-Rauzer, Rauzer attack, 7...a6 defense, 9...Be7   B69     Sicilian : Richter-Rauzer, Rauzer attack, 7...a6 defense, 11.Bxf6   B70     Sicilian : Dragon variation   B71     Sicilian : Dragon, Levenfish variation   B71     Sicilian : Dragon, Levenfish; Flohr variation   B72     Sicilian : Dragon, 6.Be3   B72     Sicilian : Dragon, Classical attack   B72     Sicilian : Dragon, Classical, Amsterdam variation   B72     Sicilian : Dragon, Classical, Grigoriev variation   B72     Sicilian : Dragon, Classical, Nottingham variation   B73     Sicilian : Dragon, Classical, 8.O-O   B73     Sicilian : Dragon, Classical, Zollner gambit   B73     Sicilian : Dragon, Classical, Richter variation   B74     Sicilian : Dragon, Classical, 9.Nb3   B74     Sicilian : Dragon, Classical, Stockholm attack   B74     Sicilian : Dragon, Classical, Spielmann variation   B74     Sicilian : Dragon, Classical, Bernard defense   B74     Sicilian : Dragon, Classical, Reti-Tartakower variation   B74     Sicilian : Dragon, Classical, Alekhine variation   B75     Sicilian : Dragon, Yugoslav attack   B76     Sicilian : Dragon, Yugoslav attack, 7...O-O   B76     Sicilian : Dragon, Yugoslav attack, Rauser variation   B77     Sicilian : Dragon, Yugoslav attack, 9.Bc4   B77     Sicilian : Dragon, Yugoslav attack, Byrne variation   B77     Sicilian : Dragon, Yugoslav attack, 9...Bd7   B78     Sicilian : Dragon, Yugoslav attack, 10.O-O-O   B79     Sicilian : Dragon, Yugoslav attack, 12.h4   B80     Sicilian : Scheveningen variation   B80     Sicilian : Scheveningen, English variation   B80     Sicilian : Scheveningen, Vitolins variation   B80     Sicilian : Scheveningen, Fianchetto variation   B81     Sicilian : Scheveningen, Keres attack   B82     Sicilian : Scheveningen, 6.f4   B82     Sicilian : Scheveningen, Tal variation   B83     Sicilian : Scheveningen, 6.Be2   B83     Sicilian : Modern Scheveningen   B83     Sicilian : Modern Scheveningen, Main line   B83     Sicilian : Modern Scheveningen, Main line with Nb3   B84     Sicilian : Scheveningen (Paulsen), Classical variation   B84     Sicilian : Scheveningen, Classical, Nd7 system   B84     Sicilian : Scheveningen (Paulsen), Classical variation   B85     Sicilian : Scheveningen, Classical variation with ...Qc7 and ...Nc6   B85     Sicilian : Scheveningen, Classical, Maroczy system   B85     Sicilian : Scheveningen, Classical   B85     Sicilian : Scheveningen, Classical Main line   B86     Sicilian : Sozin attack   B87     Sicilian : Sozin with ...a6 and ...b5   B88     Sicilian : Sozin, Leonhardt variation   B88     Sicilian : Sozin, Fischer variation   B89     Sicilian : Sozin, 7.Be3   B89     Sicilian : Velimirovic attack   B90     Sicilian : Najdorf   B90     Sicilian : Najdorf, Adams attack   B90     Sicilian : Najdorf, Lipnitzky attack   B90     Sicilian : Najdorf, Byrne (English) attack   B91     Sicilian : Najdorf, Zagreb (Fianchetto) variation   B92     Sicilian : Najdorf, Opovcensky variation   B93     Sicilian : Najdorf, 6.f4   B94     Sicilian : Najdorf, 6.Bg5   B94     Sicilian : Najdorf, Ivkov variation   B95     Sicilian : Najdorf, 6...e6   B96     Sicilian : Najdorf, 7.f4   B96     Sicilian : Najdorf, Polugayevsky variation   B96     Sicilian : Najdorf, Polugayevsky, Simagin variation   B97     Sicilian : Najdorf, 7...Qb6   B97     Sicilian : Najdorf, Poisoned pawn variation   B98     Sicilian : Najdorf, 7...Be7   B98     Sicilian : Najdorf, Browne variation   B98     Sicilian : Najdorf, Goteborg (Argentine) variation   B98     Sicilian : Najdorf variation   B99     Sicilian : Najdorf, 7...Be7 Main line   C00     French defense   C00     French defense, Steiner variation   C00     French : Reti (Spielmann) variation   C00     French : Steinitz attack   C00     French : Labourdonnais variation   C00     French defense   C00     French : Wing gambit   C00     French defense   C00     French : Pelikan variation   C00     French : Two knights variation   C00     French : Chigorin variation   C00     French : King's Indian attack   C00     French : Reversed Philidor formation   C00     French defense   C00     Lengfellner system   C00     St. George defense   C00     French defense   C00     French : Schlechter variation   C00     French : Alapin variation   C01     French : Exchange variation   C01     French : Exchange, Svenonius variation   C01     French : Exchange, Bogolyubov variation   C02     French : Advance variation   C02     French : Advance, Steinitz variation   C02     French : Advance, Nimzovich variation   C02     French : Advance, Nimzovich system   C02     French : Advance variation   C02     French : Advance, Wade variation   C02     French : Advance variation   C02     French : Advance, Paulsen attack   C02     French : Advance, Milner-Barry gambit   C02     French : Advance, Euwe variation   C03     French : Tarrasch   C03     French : Tarrasch, Haberditz variation   C03     French : Tarrasch, Guimard variation   C04     French : Tarrasch, Guimard Main line   C05     French : Tarrasch, Closed variation   C05     French : Tarrasch, Botvinnik variation   C05     French : Tarrasch, Closed variation   C06     French : Tarrasch, Closed variation, Main line   C06     French : Tarrasch, Leningrad variation   C07     French : Tarrasch, Open variation   C07     French : Tarrasch, Eliskases variation   C08     French : Tarrasch, Open, 4.ed ed   C09     French : Tarrasch, Open variation, Main line   C10     French : Paulsen variation   C10     French : Marshall variation   C10     French : Rubinstein variation   C10     French : Fort Knox variation   C10     French : Rubinstein variation   C10     French : Rubinstein, Capablanca line   C10     French : Frere (Becker) variation   C11     French defense   C11     French : Swiss variation   C11     French : Henneberger variation   C11     French : Steinitz variation   C11     French : Steinitz, Bradford attack   C11     French : Steinitz variation   C11     French : Steinitz, Brodsky-Jones variation   C11     French : Steinitz variation   C11     French : Steinitz, Boleslavsky variation   C11     French : Steinitz, Gledhill attack   C11     French : Burn variation   C12     French : MacCutcheon variation   C12     French : MacCutcheon, Bogolyubov variation   C12     French : MacCutcheon, Advance variation   C12     French : MacCutcheon, Chigorin variation   C12     French : MacCutcheon, Grigoriev variation   C12     French : MacCutcheon, Bernstein variation   C12     French : MacCutcheon, Janowski variation   C12     French : MacCutcheon, Dr. Olland (Dutch) variation   C12     French : MacCutcheon, Tartakower variation   C12     French : MacCutcheon, Lasker variation   C12     French : MacCutcheon, Duras variation   C12     French : MacCutcheon, Lasker variation, 8...g6   C13     French : Classical   C13     French : Classical, Anderssen variation   C13     French : Classical, Anderssen-Richter variation   C13     French : Classical, Vistaneckis (Nimzovich) variation   C13     French : Classical, Frankfurt variation   C13     French : Classical, Tartakower variation   C13     French : Albin-Alekhine-Chatard attack   C13     French : Albin-Alekhine-Chatard attack, Maroczy variation   C13     French : Albin-Alekhine-Chatard attack, Breyer variation   C13     French : Albin-Alekhine-Chatard attack, Teichmann variation   C13     French : Albin-Alekhine-Chatard attack, Spielmann variation   C14     French : Classical variation   C14     French : Classical, Tarrasch variation   C14     French : Classical, Rubinstein variation   C14     French : Classical, Alapin variation   C14     French : Classical, Pollock variation   C14     French : Classical, Steinitz variation   C14     French : Classical, Stahlberg variation   C15     French : Winawer (Nimzovich) variation   C15     French : Winawer, Kondratiyev variation   C15     French : Winawer, fingerslip variation   C15     French : Winawer, Alekhine (Maroczy) gambit   C15     French : Winawer, Alekhine gambit, Alatortsev variation   C15     French : Winawer, Alekhine gambit   C15     French : Winawer, Alekhine gambit, Kan variation   C16     French : Winawer, Advance variation   C16     French : Winawer, Petrosian variation   C17     French : Winawer, Advance variation   C17     French : Winawer, Advance, Bogolyubov variation   C17     French : Winawer, Advance, Russian variation   C17     French : Winawer, Advance, 5.a3   C17     French : Winawer, Advance, Rauzer variation   C18     French : Winawer, Advance variation   C18     French : Winawer, Classical variation   C19     French : Winawer, Advance, 6...Ne7   C19     French : Winawer, Advance, Smyslov variation   C19     French : Winawer, Advance, positional Main line   C19     French : Winawer, Advance, poisoned pawn variation   C19     French : Winawer, Advance, poisoned pawn, Euwe-Gligoric variation   C19     French : Winawer, Advance, poisoned pawn, Konstantinopolsky variation   C20     King's pawn game   C20     Variation Indian Opening : Indian Opening   C20     Variation Mengarini's Opening : Mengarini's Opening   C20     Variation King's head Opening : King's head Opening   C20     Variation Patzer Opening : Patzer Opening   C20     Variation Napoleon's Opening : Napoleon's Opening   C20     Variation Lopez Opening : Lopez Opening   C20     Alapin's Opening   C21     Centre game   C21     Centre game, Kieseritsky variation   C21     Halasz gambit   C21     Danish gambit   C21     Danish gambit : Collijn defense   C21     Danish gambit : Schlechter defense   C21     Danish gambit : Soerensen defense   C21     Centre game   C22     Centre game   C22     Centre game : Paulsen attack   C22     Centre game : Charousek variation   C22     Centre game : l'Hermet variation   C22     Centre game : Berger variation   C22     Centre game : Kupreichik variation   C22     Centre game : Hall variation   C23     Bishop's Opening   C23     Bishop's Opening : Philidor counter-attack   C23     Bishop's Opening : Lisitsyn variation   C23     Bishop's Opening : Calabrese counter-gambit   C23     Bishop's Opening : Calabrese counter-gambit, Jaenisch variation   C23     Bishop's Opening : Classical variation   C23     Bishop's Opening : Lopez gambit   C23     Bishop's Opening : Philidor variation   C23     Bishop's Opening : Pratt variation   C23     Bishop's Opening : Lewis counter-gambit   C23     Bishop's Opening : del Rio variation   C23     Bishop's Opening : Lewis gambit   C23     Bishop's Opening : Wing gambit   C23     Bishop's Opening : MacDonnell double gambit   C23     Bishop's Opening : Four pawns' gambit   C24     Bishop's Opening : Berlin defense   C24     Bishop's Opening : Greco gambit   C24     Bishop's Opening : Ponziani gambit   C24     Bishop's Opening : Urusov gambit   C24     Bishop's Opening : Urusov gambit, Panov variation   C25     Vienna game   C25     Vienna : Zhuravlev countergambit   C25     Vienna game, Max Lange defense   C25     Vienna : Paulsen variation   C25     Vienna : Fyfe gambit   C25     Vienna gambit   C25     Vienna : Steinitz gambit   C25     Vienna : Steinitz gambit, Zukertort defense   C25     Vienna : Steinitz gambit, Fraser-Minckwitz variation   C25     Vienna gambit   C25     Vienna : Hamppe-Allgaier gambit   C25     Vienna : Hamppe-Allgaier gambit, Alapin variation   C25     Vienna : Hamppe-Muzio gambit   C25     Vienna : Hamppe-Muzio, Dubois variation   C25     Vienna : Pierce gambit   C25     Vienna : Pierce gambit, Rushmere attack   C26     Vienna : Falkbeer variation   C26     Vienna : Mengarini variation   C26     Vienna : Paulsen-Mieses variation   C26     Vienna game   C27     Vienna game   C27     Vienna : `Frankenstein-Dracula' variation   C27     Vienna : Adams' gambit   C27     Vienna game   C27     Vienna : Alekhine variation   C27     Boden-Kieseritsky gambit   C27     Boden-Kieseritsky gambit : Lichtenhein defense   C28     Vienna game   C29     Vienna gambit   C29     Vienna gambit : Kaufmann variation   C29     Vienna gambit : Breyer variation   C29     Vienna gambit : Paulsen attack   C29     Vienna gambit : Bardeleben variation   C29     Vienna gambit : Heyde variation   C29     Vienna gambit   C29     Vienna gambit, Wurzburger trap   C29     Vienna gambit, Steinitz variation   C30     King's gambit   C30     KGD : Keene's defense   C30     KGD : Mafia defense   C30     KGD : Norwalde variation   C30     KGD : Norwalde variation, Buecker gambit   C30     KGD : Classical variation   C30     KGD : Classical, Svenonius variation   C30     KGD : Classical, Hanham variation   C30     KGD : Classical, 4.c3   C30     KGD : Classical, Marshall attack   C30     KGD : Classical counter-gambit   C30     KGD : Classical, Reti variation   C30     KGD : Classical, SOldatenkov variation   C30     KGD : Classical, Heath variation   C30     KGD : 2...Nf6   C31     KGD : Falkbeer counter-gambit   C31     KGD : Falkbeer, Tartakower variation   C31     KGD : Falkbeer, Milner-Barry variation   C31     KGD : Falkbeer counter-gambit   C31     KGD : Nimzovich counter-gambit   C31     KGD : Falkbeer, 3...e4   C31     KGD : Falkbeer, Rubinstein variation   C31     KGD : Falkbeer, Nimzovich variation   C31     KGD : Falkbeer, 4.d3   C31     KGD : Falkbeer, Morphy gambit   C32     KGD : Falkbeer, 5.de   C32     KGD : Falkbeer, Alapin variation   C32     KGD : Falkbeer, Main line, 7...Bf5   C32     KGD : Falkbeer, Tarrasch variation   C32     KGD : Falkbeer, Charousek gambit   C32     KGD : Falkbeer, Charousek variation   C32     KGD : Falkbeer, Keres variation   C32     KGD : Falkbeer, Reti variation   C33     King's gambit accepted   C33     KGA : Tumbleweed gambit   C33     KGA : Orsini gambit   C33     KGA : Pawn's gambit (Stamma gambit)   C33     KGA : Schurig gambit   C33     KGA : Carrera (Basman) gambit   C33     KGA : Villemson (Steinitz) gambit   C33     KGA : Keres (Mason-Steinitz) gambit   C33     KGA : Breyer gambit   C33     KGA : Lesser Bishop's (Petroff-Jaenisch-Tartakower) gambit   C33     KGA : Bishop's gambit   C33     KGA : Bishop's gambit, Chigorin's attack   C33     KGA : Bishop's gambit, Greco variation   C33     KGA : Bishop's gambit, Classical defense   C33     KGA : Bishop's gambit, Grimm attack   C33     KGA : Bishop's gambit, Classical defense   C33     KGA : Bishop's gambit, McDonnell attack   C33     KGA : Bishop's gambit, McDonnell attack   C33     KGA : Bishop's gambit, Fraser variation   C33     KGA : Bishop's gambit, Classical defense, Cozio attack   C33     KGA : Bishop's gambit, Boden defense   C33     KGA : Bishop's gambit, Bryan counter-gambit   C33     KGA : Bishop's gambit, Bryan counter-gambit   C33     KGA : Bishop's gambit, Steinitz defense   C33     KGA : Bishop's gambit, Maurian defense   C33     KGA : Bishop's gambit, Ruy Lopez defense   C33     KGA : Bishop's gambit, Lopez-Gianutio counter-gambit   C33     KGA : Lopez-Gianutio counter-gambit, Hein variation   C33     KGA : Bishop's gambit, Bledow variation   C33     KGA : Bishop's gambit, Gifford variation   C33     KGA : Bishop's gambit, Boren-Svenonius variation   C33     KGA : Bishop's gambit, Anderssen variation   C33     KGA : Bishop's gambit, Morphy variation   C33     KGA : Bishop's gambit, Cozio (Morphy) defense   C33     KGA : Bishop's gambit, Bogolyubov variation   C33     KGA : Bishop's gambit, Paulsen attack   C33     KGA : Bishop's gambit, Jaenisch variation   C34     King's knight's gambit   C34     KGA : Bonsch-Osmolovsky variation   C34     KGA : Gianutio counter-gambit   C34     KGA : Fischer defense   C34     KGA : Becker defense   C34     KGA : Schallop defense   C35     KGA : Cunningham defense   C35     KGA : Cunningham, Bertin gambit   C35     KGA : Cunningham, Three pawns gambit   C35     KGA : Cunningham, Euwe defense   C36     KGA : Abbazia defense (Classical defense, Modern defense!)   C36     KGA : Abbazia defense, Modern variation   C36     KGA : Abbazia defense, Botvinnik variation   C37     KGA : Quaade gambit   C37     KGA : Rosentreter gambit   C37     KGA : Soerensen gambit   C37     KGA : King's knight's gambit   C37     KGA : Blachly gambit   C37     KGA : Lolli gambit (wild Muzio gambit)   C37     KGA : Lolli gambit, Young variation   C37     KGA : Ghulam Kassim gambit   C37     KGA : MacDonnell gambit   C37     KGA : Salvio gambit   C37     KGA : Silberschmidt gambit   C37     KGA : Salvio gambit, Anderssen counter-attack   C37     KGA : Cochrane gambit   C37     KGA : Herzfeld gambit   C37     KGA : Muzio gambit   C37     KGA : Muzio gambit, Paulsen variation   C37     KGA : double Muzio gambit   C37     KGA : Muzio gambit, From defense   C37     KGA : Muzio gambit, Holloway defense   C37     KGA : Muzio gambit, Kling and Horwitz counter-attack   C37     KGA : Muzio gambit, Brentano defense   C38     King's knight's gambit   C38     KGA : Hanstein gambit   C38     KGA : Philidor gambit   C38     KGA : Greco gambit   C38     KGA : Philidor gambit, Schultz variation   C39     King's knight's gambit   C39     KGA : Allgaier gambit   C39     KGA : Allgaier, Horny defense   C39     KGA : Allgaier, ThorOld variation   C39     KGA : Allgaier, Cook variation   C39     KGA : Allgaier, Blackburne gambit   C39     KGA : Allgaier, Walker attack   C39     KGA : Allgaier, Urusov attack   C39     KGA : Allgaier, Schlechter defense   C39     KGA : Kieseritsky, Paulsen defense   C39     KGA : Kieseritsky, long whip (Stockwhip, Classical) defense   C39     KGA : Kieseritsky, long whip defense, Jaenisch variation   C39     KGA : Kieseritsky, Brentano (Campbell) defense   C39     KGA : Kieseritsky, Brentano defense, Kaplanek variation   C39     KGA : Kieseritsky, Brentano defense   C39     KGA : Kieseritsky, Brentano defense, Caro variation   C39     KGA : Kieseritsky, Salvio (Rosenthal) defense