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List of chess openings
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==A – Flank openings== * White first moves other than 1.e4, 1.d4 (A00–A39) * 1.d4 without 1...d5, 1...Nf6 or 1...f5: Atypical replies to 1.d4 (A40–A44) * 1.d4 Nf6 without 2.c4: Atypical replies to 1...Nf6 (A45–A49) * 1.d4 Nf6 2.c4 without 2...e6 or 2...g6: Atypical [[Indian defences|Indian systems]] (A50–A79) * 1.d4 f5: [[Dutch Defence]] (A80–A99) ===A00–A09=== White first moves other than 1.e4, 1.d4, 1.c4: ==== A00 [[Irregular chess openings|Irregular Openings]] ==== *[[Anderssen's Opening]]: 1.a3 *Anderssen's Opening: Polish Gambit: 1.a3 a5 2.b4 *Formation: Hippopotamus Attack: 1.a3 e5 2.b3 d5 3.c3 Nf6 4.d3 Nc6 5.e3 Bd6 6.f3 0-0 7.g3 *Formation: Shy Attack: 1.a3 e5 2.g3 d5 3.Bg2 Nf6 4.d3 Nc6 5.Nd2 Bd6 6.e3 0-0 7.h3 *[[Van Geet Opening]]: Reversed Nimzowitsch, Battambang Variation: 1.a3 e5 2.Nc3 *[[Ware Opening]]: 1.a4 *Ware Opening: Symmetric Variation: 1.a4 a5 *Ware Opening: Wing Gambit: 1.a4 b5 2.axb5 Bb7 *Ware Opening: Cologne Gambit: 1.a4 b6 2.d4 d5 3.Nc3 Nd7 *Ware Opening: Ware Gambit: 1.a4 e5 2.a5 d5 3.e3 f5 4.a6 *Ware Opening: Crab Variation: 1.a4 e5 2.h4 *Ware Opening: Meadow Hay Trap: 1.a4 e5 2.Ra3 *[[Polish Opening]]: 1.b4 *Polish Opening: Symmetrical Variation: 1.b4 b5 *Polish Opening: Birmingham Gambit: 1.b4 c5 *Polish Opening: Outflank Variation: 1.b4 c6 *Polish Opening: Outflank, Schuehler Gambit: 1.b4 c6 2.Bb2 a5 3.b5 cxb5 4.e4 *Polish Opening: Baltic Defense: 1.b4 d5 2.Bb2 Bf5 *Polish Opening: Myers Variation: 1.b4 d5 2.Bb2 c6 3.a4 *Polish Opening: German Defense: 1.b4 d5 2.Bb2 Qd6 *Polish Opening: Bugayev Attack: 1.b4 e5 2.a3 *Polish Opening: Wolferts Gambit: 1.b4 e5 2.Bb2 c5 *Polish Opening: Czech Defense: 1.b4 e5 2.Bb2 d6 *Polish Opening: Bugayev Advance Variation: 1.b4 e5 2.Bb2 f6 3.b5 *Polish Opening: Tartakower Gambit: 1.b4 e5 2.Bb2 f6 3.e4 *Polish Opening: Queenside Defense: 1.b4 e6 2.Bb2 Nf6 3.b5 a6 *Polish Opening: Queenside Defense, Rooks Exchange Line: 1.b4 e6 2.Bb2 Nf6 3.b5 a6 4.a4 axb5 5.axb5 Rxa1 6.Bxa1 *Polish Opening: Queen's Indian Variation: 1.b4 e6 2.Bb2 Nf6 3.b5 b6 *Polish Opening: Schiffler-Sokolsky Variation: 1.b4 e6 2.Bb2 Nf6 3.b5 d5 4.e3 *Polish Opening: Dutch Defense: 1.b4 f5 *Polish Opening: Grigorian Variation: 1.b4 Nc6 *Polish Opening: King's Indian Variation: 1.b4 Nf6 2.Bb2 g6 *Polish Opening: King's Indian Variation, Sokolsky Attack: 1.b4 Nf6 2.Bb2 g6 3.c4 Bg7 4.e3 d6 5.Nf3 0-0 6.d4 *Polish Opening: King's Indian Variation, Schiffler Attack: 1.b4 Nf6 2.Bb2 g6 3.e4 *Polish Opening: Karniewski Variation: 1.b4 Nh6 *[[Saragossa Opening]]: 1.c3 *[[Mieses Opening]]: 1.d3 *Mieses Opening: Venezolana Variation: 1.d3 c5 2.Nc3 Nc6 3.g3 *Mieses Opening: Reversed Rat: 1.d3 e5 *Valencia Opening: 1.d3 e5 2.Nd2 *Mieses Opening: Myers Spike Attack: 1.d3 g6 2.g4 *[[Van 't Kruijs Opening|Van't Kruijs Opening]]: 1.e3 *Van't Kruijs Opening: Bouncing Bishop Variation: 1.e3 e5 2.Bc4 b5 3.Bb3 *Amsterdam Attack: 1.e3 e5 2.c4 d6 3.Nc3 Nc6 4.b3 Nf6 *Van't Kruijs Opening: Keoni-Hiva Gambit, Ekolu Variation: 1.e3 e5 2.Nc3 d5 3.f4 exf4 4.Nf3 *Van't Kruijs Opening: Keoni-Hiva Gambit, Alua Variation: 1.e3 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3 *Van't Kruijs Opening: Keoni-Hiva Gambit, Akahi Variation: 1.e3 e5 2.Nc3 Nf6 3.f4 exf4 4.Nf3 *[[Barnes Opening]]: 1.f3 *Barnes Opening: Gedult Gambit: 1.f3 d5 2.e4 g6 3.d4 dxe4 4.c3 *Barnes Opening: Fool's Mate: 1.f3 e5 2.g4 Qh4# *Barnes Opening: Hammerschlag: 1.f3 e5 2.Kf2 *Barnes Opening: Gedult Gambit: 1.f3 f5 2.e4 fxe4 3.Nc3 *[[Hungarian Opening]]: 1.g3 *Hungarian Opening: Sicilian Invitation: 1.g3 c5 *Hungarian Opening: Reversed Modern Defense: 1.g3 d5 2.Bg2 c5 *Hungarian Opening: Slav Formation: 1.g3 d5 2.Bg2 c6 *Hungarian Opening: Bücker Gambit: 1.g3 d5 2.Bg2 e5 3.b4 *Hungarian Opening: Winterberg Gambit: 1.g3 d5 2.Bg2 e5 3.c4 dxc4 4.b3 *Hungarian Opening: Catalan Formation: 1.g3 d5 2.Bg2 e6 *Hungarian Opening: Burk Gambit: 1.g3 e5 2.a3 d5 3.Nf3 e4 4.Nh4 Be7 5.d3 *Hungarian Opening: Reversed Alekhine: 1.g3 e5 2.Nf3 *Hungarian Opening: Reversed Brooklyn Defense, Brooklyn Benko Gambit: 1.g3 e5 2.Nf3 e4 3.Ng1 Nf6 4.b4 *Hungarian Opening: Reversed Norwegian Defense: 1.g3 e5 2.Nf3 e4 3.Nh4 *Hungarian Opening: Paris Gambit: 1.g3 e5 2.Nh3 d5 3.f4 Bxh3 4.Bxh3 exf4 5.0-0 *Hungarian Opening: Dutch Defense: 1.g3 f5 *Hungarian Opening: Pachman Gambit: 1.g3 f5 2.e4 fxe4 3.Qh5+ g6 *Hungarian Opening: Myers Defense: 1.g3 g5 *Hungarian Opening: Symmetrical Variation: 1.g3 g6 *Lasker Simul Special: 1.g3 h5 *Hungarian Opening: Van Kuijk Gambit: 1.g3 h5 2.Nf3 h4 *Hungarian Opening: Asten Gambit: 1.g3 Nc6 2.Nc3 d5 3.d4 e5 4.dxe5 d4 5.Ne4 f5 *Hungarian Opening: Indian Defense: 1.g3 Nf6 *[[Grob's Attack|Grob Opening]]: 1.g4 *Grob Opening: Grob Gambit: 1.g4 d5 2.Bg2 *Grob Opening: Grob Gambit, Fritz Gambit: 1.g4 d5 2.Bg2 Bxg4 3.c4 *Grob Opening: Romford Countergambit: 1.g4 d5 2.Bg2 Bxg4 3.c4 d4 *Grob Opening: Grob Gambit, Fritz Gambit, Romford Countergambit: 1.g4 d5 2.Bg2 Bxg4 3.c4 d4 4.Bxb7 Nd7 5.Bxa8 Qxa8 *Grob Opening: Grob Gambit Declined: 1.g4 d5 2.Bg2 c6 *Grob Opening: Grob Gambit, Richter-Grob Gambit: 1.g4 d5 2.Bg2 c6 3.c4 dxc4 4.b3 *Grob Opening: Spike Attack: 1.g4 d5 2.Bg2 c6 3.g5 *Grob Opening: Grob Gambit, Keres Gambit: 1.g4 d5 2.Bg2 e5 3.d4 exd4 4.c3 *Grob Opening: Grob Gambit, Basman Gambit: 1.g4 d5 2.Bg2 h5 3.gxh5 *Grob Opening: Zilbermints Gambit: 1.g4 d5 2.e4 dxe4 3.Nc3 *Grob Opening: Zilbermints Gambit, Zilbermints-Hartlaub Gambit: 1.g4 d5 2.e4 dxe4 3.Nc3 e5 4.d3 *Grob Opening: Zilbermints Gambit, Schiller Defense: 1.g4 d5 2.e4 dxe4 3.Nc3 h5 *Grob Opening: Keene Defense: 1.g4 d5 2.h3 e5 3.Bg2 c6 *Grob Opening: Keene Defense, Main Line: 1.g4 d5 2.h3 e5 3.Bg2 c6 4.d4 e4 5.c4 Bd6 6.Nc3 Ne7 *Grob Opening: Spike, Hurst Attack: 1.g4 e5 2.Bg2 d5 3.c4 *Grob Opening: London Defense: 1.g4 e5 2.h3 Nc6 *Grob Opening: Alessi Gambit: 1.g4 f5 *Grob Opening: Double Grob: 1.g4 g5 *Grob Opening: Double Grob, Coca-Cola Gambit: 1.g4 g5 2.f4 *[[Clemenz Opening]]: 1.h3 *Creepy Crawly Formation: Classical Defense: 1.h3 d5 2.a3 e5 *Global Opening: 1.h3 e5 2.a3 *Clemenz Opening: Spike Lee Gambit: 1.h3 h5 2.g4 *[[Kadas Opening|Kádas Opening:]] 1.h4 *Kádas Opening: Koola-Koola Variation: 1.h4 a5 *Kádas Opening: Kádas Gambit: 1.h4 c5 2.b4 *Kádas Opening: Myers Variation: 1.h4 d5 2.d4 c5 3.e4 *Kádas Opening: Kádas Gambit: 1.h4 d5 2.d4 c5 3.Nf3 cxd4 4.c3 *Kádas Opening: Beginner's Trap: 1.h4 d5 2.Rh3 *Kádas Opening: Kádas Gambit: 1.h4 e5 2.d4 exd4 3.c3 *Kádas Opening: Steinbok Gambit: 1.h4 f5 2.e4 fxe4 3.d3 *Kádas Opening: Schneider Gambit: 1.h4 g5 *[[Sodium Attack]]: 1.Na3 *Sodium Attack: Celadon Variation: 1.Na3 e5 2.d3 Bxa3 3.bxa3 d5 4.e3 c5 5.Rb1 *Sodium Attack: Durkin Gambit: 1.Na3 e5 2.Nc4 Nc6 3.e4 f5 *Sodium Attack: Chenoboskion Variation: 1.Na3 g6 2.g4 *[[Van Geet Opening]]: 1.Nc3 *Van Geet Opening: Laroche Gambit: 1.Nc3 b5 *Van Geet Opening: Düsseldorf Gambit: 1.Nc3 c5 2.b4 *Van Geet Opening: Novosibirsk Variation: 1.Nc3 c5 2.d4 cxd4 3.Qxd4 Nc6 4.Qh4 *Van Geet Opening: Sicilian Two Knights: 1.Nc3 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 *Van Geet Opening: Twyble Attack: 1.Nc3 c5 2.Rb1 *Van Geet Opening: Venezolana Variation: 1.Nc3 d5 2.d3 Nf6 3.g3 *Van Geet Opening: Sleipnir Gambit: 1.Nc3 d5 2.e3 e5 3.d4 Bb4 *Van Geet Opening: Hector Gambit: 1.Nc3 d5 2.e4 dxe4 3.Bc4 *Van Geet Opening: Dunst-Perrenet Gambit: 1.Nc3 d5 2.e4 dxe4 3.d3 *Van Geet Opening: Dougherty Gambit: 1.Nc3 d5 2.e4 dxe4 3.f3 *Van Geet Opening: Melleby Gambit: 1.Nc3 d5 2.f4 d4 3.Ne4 c5 *Van Geet Opening: Pfeiffer Gambit: 1.Nc3 d5 2.f4 d4 3.Ne4 e5 *Van Geet Opening: Pfeiffer Gambit, Sleipnir Countergambit: 1.Nc3 d5 2.f4 d4 3.Ne4 e5 4.Nf3 *Van Geet Opening: Jendrossek Gambit: 1.Nc3 d5 2.f4 d4 3.Ne4 f5 4.Nf2 Nf6 5.Nf3 c5 6.b4 *Van Geet Opening: Damhaug Gambit: 1.Nc3 d5 2.f4 e5 *Van Geet Opening: Warsteiner Gambit: 1.Nc3 d5 2.f4 g5 *Van Geet Opening: Hergert Gambit: 1.Nc3 d6 2.f4 e5 3.fxe5 Nc6 *Van Geet Opening: Reversed Nimzowitsch: 1.Nc3 e5 *Van Geet Opening: Gladbacher Gambit: 1.Nc3 e5 2.b3 d5 3.e4 dxe4 4.d3 *Van Geet Opening: Reversed Scandinavian: 1.Nc3 e5 2.d4 exd4 3.Qxd4 Nc6 4.Qa4 *Van Geet Opening: Hulsemann Gambit: 1.Nc3 e5 2.e3 d5 3.Qh5 Be6 *Van Geet Opening: Liebig Gambit: 1.Nc3 e5 2.e3 d5 3.Qh5 Nf6 *Van Geet Opening: Nowokunski Gambit: 1.Nc3 e5 2.f4 exf4 3.e4 *Van Geet Opening: Billockus-Johansen Gambit: 1.Nc3 e5 2.Nf3 Bc5 *Van Geet Opening: Napoleon Attack: 1.Nc3 e5 2.Nf3 Nc6 3.d4 *Van Geet Opening: Kluever Gambit: 1.Nc3 f5 2.e4 fxe4 3.d3 *Van Geet Opening: Myers Attack: 1.Nc3 g6 2.h4 *Van Geet Opening: Tübingen Gambit: 1.Nc3 Nf6 2.g4 *[[Amar Opening]]: 1.Nh3 *Amar Opening: Paris Gambit: 1.Nh3 d5 2.g3 e5 3.f4 *Amar Opening: Paris Gambit, Gent Gambit: 1.Nh3 d5 2.g3 e5 3.f4 Bxh3 4.Bxh3 exf4 5.0-0 fxg3 6.hxg3 ==== A01 [[Larsen's Opening]]: 1.b3 ==== *Nimzo-Larsen Attack: 1.b3 *Nimzo-Larsen Attack: Polish Variation: 1.b3 b5 *Nimzo-Larsen Attack: Symmetrical Variation: 1.b3 b6 *Nimzo-Larsen Attack: English Variation: 1.b3 c5 *Nimzo-Larsen Attack: Classical Variation: 1.b3 d5 *Nimzo-Larsen Attack: Graz Attack: 1.b3 d5 2.Ba3 *Nimzo-Larsen Attack: Modern Variation: 1.b3 e5 *Nimzo-Larsen Attack: Modern Variation: 1.b3 e5 2.Bb2 Nc6 *Nimzo-Larsen Attack: Modern Variation: 1.b3 e5 2.Bb2 Nc6 3.c4 Nf6 *Nimzo-Larsen Attack: Modern Variation: 1.b3 e5 2.Bb2 Nc6 3.e3 *Nimzo-Larsen Attack: Pachman Gambit: 1.b3 e5 2.Bb2 Nc6 3.f4 *Nimzo-Larsen Attack: Dutch Variation: 1.b3 f5 *Nimzo-Larsen Attack: Ringelbach Gambit: 1.b3 f5 2.Bb2 e6 3.e4 *Nimzo-Larsen Attack: Indian Variation: 1.b3 Nf6 *Nimzo-Larsen Attack: Spike Variation: 1.b3 Nf6 2.Bb2 g6 3.g4 ==== A02–A03 [[Bird's Opening]] ==== '''A02''' *Bird Opening: 1.f4 *Bird Opening: Myers Defense: 1.f4 b5 *Bird Opening: From's Gambit: 1.f4 e5 *Bird Opening: Siegener Gambit: 1.f4 e5 2.d4 exd4 3.Nf3 c5 4.c3 *Bird Opening: From's Gambit, Lasker Variation: 1.f4 e5 2.fxe5 d6 3.exd6 Bxd6 4.Nf3 g5 *Bird Opening: From's Gambit, Lipke Variation: 1.f4 e5 2.fxe5 d6 3.exd6 Bxd6 4.Nf3 Nh6 5.d4 *Bird Opening: From's Gambit, Langheld Gambit: 1.f4 e5 2.fxe5 d6 3.exd6 Nf6 *Bird Opening: Lasker Gambit: 1.f4 e5 2.fxe5 f6 *Bird Opening: Schlechter Gambit: 1.f4 e5 2.fxe5 Nc6 *Bird Opening: Platz Gambit: 1.f4 e5 2.fxe5 Ne7 *Bird Opening: From's Gambit, Bahr Gambit: 1.f4 e5 2.Nc3 *Bird Opening: Double Duck Formation: 1.f4 f5 2.d4 d5 *Bird Opening: Wagner-Zwitersch Gambit: 1.f4 f5 2.e4 *Bird Opening: Swiss Gambit: 1.f4 f5 2.e4 fxe4 3.Nc3 Nf6 4.g4 *Bird Opening: Hobbs Gambit: 1.f4 g5 *Bird Opening: Hobbs-Zilbermints Gambit: 1.f4 h6 2.Nf3 g5 *Bird Opening: Mujannah: 1.f4 Nf6 2.c4 *Bird Opening: Batavo-Polish Attack: 1.f4 Nf6 2.Nf3 g6 3.b4 *Bird Opening: Horsefly Defense: 1.f4 Nh6 '''A03''' Bird's Opening, Dutch Variation: *Bird Opening: Dutch Variation: 1.f4 d5 *Bird Opening: Thomas Gambit: 1.f4 d5 2.b3 Nf6 3.Bb2 d4 4.Nf3 c5 5.e3 *Bird Opening: Sturm Gambit: 1.f4 d5 2.c4 *Bird Opening: Williams Gambit: 1.f4 d5 2.e4 *Bird Opening: Williams-Zilbermints Gambit: 1.f4 d5 2.e4 dxe4 3.Nc3 Nf6 4.Nge2 *Bird Opening: Williams Gambit: 1.f4 d5 2.e4 dxe4 3.Nc3 Nf6 4.Qe2 *Bird Opening: Dutch Variation, Dudweiler Gambit: 1.f4 d5 2.g4 *Bird Opening: Lasker Variation: 1.f4 d5 2.Nf3 Nf6 3.e3 c5 ==== A04–A09 [[Zukertort Opening|Réti Opening or Zukertort Opening]] ==== '''A04''' *Zukertort Opening: 1.Nf3 *Zukertort Opening: Ware Defense: 1.Nf3 a5 *Zukertort Opening: St. George Defense: 1.Nf3 a6 *Zukertort Opening: Polish Defense: 1.Nf3 b5 *Zukertort Opening: Queenside Fianchetto Variation: 1.Nf3 b6 *Zukertort Opening: Sicilian Invitation: 1.Nf3 c5 *Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation: 1.Nf3 c5 2.c4 g6 3.d4 Bg7 4.e4 Qa5+ *Modern Defense: Semi-Averbakh Variation, Polish Variation: 1.Nf3 c5 2.c4 g6 3.d4 Bg7 4.e4 Qb6 *Zukertort Opening: Speelsmet Gambit: 1.Nf3 c5 2.d4 cxd4 3.e3 *Colle System: Rhamphorhynchus Variation: 1.Nf3 c5 2.e3 g6 3.d4 Bg7 4.dxc5 Qa5+ *Zukertort Opening: Slav Invitation: 1.Nf3 c6 *Zukertort Opening: Pirc Invitation: 1.Nf3 d6 *Zukertort Opening: Vos Gambit: 1.Nf3 d6 2.d4 e5 *Zukertort Opening: Wade Defense: 1.Nf3 d6 2.e4 Bg4 *Zukertort Opening: Ross Gambit: 1.Nf3 e5 *Zukertort Opening: The Walrus: 1.Nf3 e5 2.Nxe5 Nc6 3.Nxc6 dxc6 *Zukertort Opening: Queen's Gambit Invitation: 1.Nf3 e6 *Zukertort Opening: Shabalov Gambit: 1.Nf3 e6 2.c4 a6 3.Nc3 c5 4.g3 b5 *Zukertort Opening: Dutch Variation: 1.Nf3 f5 *Zukertort Opening: Lisitsyn Gambit Deferred: 1.Nf3 f5 2.d3 Nf6 3.e4 *Zukertort Opening: Lisitsyn Gambit: 1.Nf3 f5 2.e4 *Zukertort Opening: Arctic Defense: 1.Nf3 f6 *Zukertort Opening: Arctic Defense, Drunken Knight Variation: 1.Nf3 f6 2.e4 Nh6 3.d4 Nf7 *Zukertort Opening: Herrstrom Gambit: 1.Nf3 g5 *Zukertort Opening: Kingside Fianchetto: 1.Nf3 g6 *Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation Accepted: 1.Nf3 g6 2.d4 Bg7 3.e4 d6 4.c4 c5 5.dxc5 Qa5+ *Zukertort Opening: Basman Defense: 1.Nf3 h6 *Zukertort Defense: Sicilian Knight Variation: 1.Nf3 Na6 2.e4 c5 *Zukertort Opening: Drunken Cavalry Variation: 1.Nf3 Na6 2.e4 Nh6 *Zukertort Opening: Black Mustang Defense: 1.Nf3 Nc6 *Zukertort Defense: Kingside Variation: 1.Nf3 Nh6 2.d4 g6 <br />'''A05''' Réti Opening: 1...Nf6 *Zukertort Opening: 1.Nf3 Nf6 *Zukertort Opening: Myers Polish Attack: 1.Nf3 Nf6 2.a4 g6 3.b4 *Zukertort Opening: Nimzo-Larsen Variation: 1.Nf3 Nf6 2.b3 *Polish Opening: Zukertort System: 1.Nf3 Nf6 2.b4 *Zukertort Opening: Quiet System: 1.Nf3 Nf6 2.e3 *Zukertort Opening: Lemberger Gambit: 1.Nf3 Nf6 2.e4 *King's Indian Attack: Spassky Variation: 1.Nf3 Nf6 2.g3 b5 *King's Indian Attack: 1.Nf3 Nf6 2.g3 d5 *King's Indian Attack: Symmetrical Defense: 1.Nf3 Nf6 2.g3 g6 *Zukertort Opening: Double Fianchetto Attack: 1.Nf3 Nf6 2.g3 g6 3.b3 Bg7 4.Bb2 0-0 5.Bg2 d6 6.0-0 *King's Indian Attack: Smyslov Variation: 1.Nf3 Nf6 2.g3 g6 3.b4 *King's Indian Attack: Wahls Defense: 1.Nf3 Nf6 2.g3 g6 3.Bg2 Bg7 4.0-0 0-0 5.d3 d5 *Zukertort Opening: 1.Nf3 Nf6 2.Nc3 Nc6 '''A06''' Réti Opening: 1...d5 *Zukertort Opening: Santasiere's Folly: 1.b4 d5 2.Nf3 *Zukertort Opening: Tennison Gambit: 1.e4 d5 2.Nf3 *Zukertort Opening: 1.Nf3 d5 *Zukertort Opening: The Potato: 1.Nf3 d5 2.a4 *Nimzo-Larsen Attack: Classical Variation: 1.Nf3 d5 2.b3 *Zukertort Opening: Regina-Nu Gambit: 1.Nf3 d5 2.b3 c5 3.c4 dxc4 4.Nc3 *Nimzo-Larsen Attack: Norfolk Gambit: 1.Nf3 d5 2.b3 c5 3.e4 *Nimzo-Larsen Attack: Norfolk Gambit: 1.Nf3 d5 2.b3 Nf6 3.Bb2 c5 4.e4 *Zukertort Opening: Old Indian Attack: 1.Nf3 d5 2.d3 *Zukertort Opening: Pachman Gambit: 1.Nf3 d5 2.e3 c5 3.c4 dxc4 4.b3 *Zukertort Opening: Reversed Mexican Defense: 1.Nf3 d5 2.Nc3 *Zukertort Opening: Ampel Variation: 1.Nf3 d5 2.Rg1 '''A07''' Réti Opening, [[King's Indian Attack]] (Barcza System): *Hungarian Opening: Wiedenhagen-Beta Gambit: 1.g3 d5 2.Nf3 g5 *King's Indian Attack: 1.Nf3 d5 2.g3 *King's Indian Attack: Keres Variation: 1.Nf3 d5 2.g3 Bg4 *King's Indian Attack: Keres Variation: 1.Nf3 d5 2.g3 Bg4 3.Bg2 Nd7 *King's Indian Attack: Sicilian Variation: 1.Nf3 d5 2.g3 c5 *King's Indian Attack: Omega-Delta Gambit: 1.Nf3 d5 2.g3 e5 *King's Indian Attack: Double Fianchetto: 1.Nf3 d5 2.g3 g6 *King's Indian Attack: Pachman System: 1.Nf3 d5 2.g3 g6 3.Bg2 Bg7 4.0-0 e5 5.d3 Ne7 *King's Indian Attack: Yugoslav Variation: 1.Nf3 Nf6 2.g3 d5 3.Bg2 c6 4.0-0 Bg4 '''A08''' Réti Opening, King's Indian Attack: *King's Indian Attack: Sicilian Variation: 1.e4 e6 2.d3 d5 3.Nd2 Nf6 4.Ngf3 c5 5.g3 Nc6 6.Bg2 Be7 7.0-0 0-0 8.Re1 *King's Indian Attack: Sicilian Variation: 1.Nf3 d5 2.g3 c5 3.Bg2 *King's Indian Attack: French Variation: 1.Nf3 d5 2.g3 c5 3.Bg2 Nc6 *Zukertort Opening: Reversed Grünfeld: 1.Nf3 d5 2.g3 c5 3.Bg2 Nc6 4.d4 *Zukertort Opening: Reversed Grünfeld: 1.Nf3 d5 2.g3 c5 3.Bg2 Nc6 4.d4 e6 5.0-0 *Zukertort Opening: Reversed Grünfeld: 1.Nf3 d5 2.g3 c5 3.Bg2 Nc6 4.d4 Nf6 *Zukertort Opening: Reversed Grünfeld: 1.Nf3 d5 2.g3 c5 3.Bg2 Nc6 4.d4 Nf6 5.0-0 *King's Indian Attack: Sicilian Variation: 1.Nf3 d5 2.g3 c5 3.Bg2 Nf6 4.0-0 e6 5.d3 '''A09''' [[Réti Opening]]: *Réti Opening: 1.Nf3 d5 2.c4 *Réti Opening: Zilbermints Gambit: 1.Nf3 d5 2.c4 b5 *Réti Opening: Advance Variation: 1.Nf3 d5 2.c4 d4 *Réti Opening: Advance Variation, Michel Gambit: 1.Nf3 d5 2.c4 d4 3.b4 c5 *Réti Opening: Reversed Blumenfeld Gambit: 1.Nf3 d5 2.c4 d4 3.e3 c5 4.b4 *Réti Opening: Penguin Variation: 1.Nf3 d5 2.c4 d4 3.Rg1 *Réti Opening: Réti Gambit: 1.Nf3 d5 2.c4 dxc4 *Réti Opening: Réti Gambit, Keres Variation: 1.Nf3 d5 2.c4 dxc4 3.e3 Be6 ===A10–A39=== 1.c4: [[English Opening]] '''A10''': 1.c4 (without: 1...g6 2.d4, 1...f5 2.d4, 1...b6 2.d4, 1...d6 2.e4, 1...d6 2.d4, 1...Nc6 2.d4) *English Opening: 1.c4 *English Opening: Jaenisch Gambit: 1.c4 b5 *English Opening: Anglo-Scandinavian Defense: 1.c4 d5 *English Opening: Anglo-Scandinavian Defense, Löhn Gambit: 1.c4 d5 2.cxd5 e6 *English Opening: Anglo-Scandinavian Defense, Schulz Gambit: 1.c4 d5 2.cxd5 Nf6 *English Opening: Anglo-Scandinavian Defense, Malvinas Variation: 1.c4 d5 2.cxd5 Qxd5 3.Nc3 Qa5 *English Opening: Anglo-Dutch Defense: 1.c4 f5 *English Opening: Anglo-Dutch Defense, Hickmann Gambit: 1.c4 f5 2.e4 *English Opening: Wade Gambit: 1.c4 f5 2.g4 *English Opening: Anglo-Dutch Variation, Ferenc Gambit: 1.c4 f5 2.Nc3 Nf6 3.e4 *English Opening: Porcupine Variation: 1.c4 f5 2.Nc3 Nf6 3.e4 fxe4 4.g4 *English Opening: Anglo-Dutch Variation, Chabanon Gambit: 1.c4 f5 2.Nf3 d6 3.e4 *English Opening: Myers Defense: 1.c4 g5 *English Opening: Myers Gambit: 1.c4 g5 2.d4 Bg7 *English Opening: Zilbermints Gambit: 1.c4 g5 2.d4 e5 *English Opening: Great Snake Variation: 1.c4 g6 *English Opening: Adorjan Defense: 1.c4 g6 2.e4 e5 *English Opening: King's English Variation, Botvinnik System, Prickly Pawn Pass System: 1.c4 g6 2.Nc3 Bg7 3.g3 Nf6 4.Bg2 0-0 5.e4 d6 6.Nge2 e5 7.0-0 c6 8.d3 a6 *English Opening: Anglo-Lithuanian Variation: 1.c4 Nc6 *English Opening: Achilles-Omega Gambit: 1.c4 Nf6 2.e4 '''A11''' English, Caro–Kann defensive system, 1...c6 (without: 2.e4, 2.d4) *English Opening: Caro-Kann Defensive System: 1.c4 c6 '''A12''' English, Caro–Kann defensive system: 2.Nf3 d5 3.b3 *Réti Opening: Anglo-Slav Variation, London Defensive System: 1.c4 Nf6 2.g3 c6 3.Nf3 d5 4.b3 Bf5 *Réti Opening: Anglo-Slav Variation, Torre System: 1.c4 Nf6 2.g3 c6 3.Nf3 d5 4.b3 Bg4 *Réti Opening: Anglo-Slav Variation, Capablanca Variation: 1.c4 Nf6 2.Nf3 c6 3.b3 d5 4.Bb2 Bg4 *Réti Opening: Anglo-Slav Variation, Bled Variation: 1.Nf3 d5 2.b3 Nf6 3.Bb2 g6 4.c4 c6 *Réti Opening: Anglo-Slav Variation, Bogoljubow Variation: 1.Nf3 d5 2.c4 c6 3.b3 *Réti Opening: Anglo-Slav Variation, Bogoljubow Variation: 1.Nf3 d5 2.c4 c6 3.b3 Bg4 *Réti Opening: Anglo-Slav Variation, Bogoljubow Variation: 1.Nf3 Nf6 2.c4 c6 3.b3 d5 4.Bb2 *Réti Opening: Anglo-Slav Variation, New York System: 1.Nf3 Nf6 2.c4 c6 3.b3 d5 4.Bb2 Bf5 '''A13''' English Opening: 1...e6 (without 2.e4 or 2.d4) *English Opening: Agincourt Defense: 1.c4 e6 *English Opening: Agincourt Defense: 1.c4 e6 2.Nf3 *English Opening: Agincourt Defense: 1.c4 e6 2.Nf3 d5 *English Opening: Agincourt Defense, Catalan Defense: 1.c4 e6 2.Nf3 d5 3.g3 b6 4.Bg2 Bb7 5.0-0 *English Opening: Agincourt Defense, Catalan Defense: 1.c4 e6 2.Nf3 d5 3.g3 c5 *English Opening: Agincourt Defense, Kurajica Defense: 1.c4 e6 2.Nf3 d5 3.g3 c6 *English Opening: Neo-Catalan: 1.c4 e6 2.Nf3 d5 3.g3 Nf6 *English Opening: Agincourt Defense, Bogoljubow Defense: 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Bd6 *English Opening: Neo-Catalan Declined: 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 *English Opening: Agincourt Defense, Tarrasch Defense: 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 c5 5.b3 Nc6 6.0-0 Be7 *English Opening: Agincourt Defense, Wimpy System: 1.c4 e6 2.Nf3 Nf6 3.b3 d5 4.Bb2 c5 5.e3 *English Opening: Agincourt Defense, Catalan Defense, Semi-Slav Defense: 1.c4 e6 2.Nf3 Nf6 3.g3 d5 4.Bg2 c6 *English Opening: Agincourt Defense, Catalan Defense Accepted: 1.c4 e6 2.Nf3 Nf6 3.g3 d5 4.Bg2 dxc4 *English Opening: Romanishin Gambit: 1.c4 Nf6 2.Nf3 e6 3.g3 a6 4.Bg2 b5 '''A14''' English, Neo-Catalan Declined: 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 *English Opening: Agincourt Defense, Neo-Catalan Declined: 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 5.0-0 *English Opening: Agincourt Defense, Keres Defense: 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 5.0-0 c5 6.cxd5 Nxd5 7.Nc3 Nc6 *Réti Opening: Anglo-Slav Variation, Bogoljubow Variation, Stonewall Line: 1.Nf3 d5 2.c4 e6 3.g3 Nf6 4.Bg2 Be7 5.0-0 0-0 6.b3 c6 7.Bb2 '''A15''' English, Anglo-Indian Defence: 1...Nf6 (without: 2.d4, 2.g3 c6, 2.g3 e5, 2.Nf3 c5, 2.Nf3 e6, 2.Nf3 c6) *English Opening: Anglo-Indian Defense, Romanishin Variation: 1.c4 e6 2.Nf3 Nf6 3.g3 a6 *English Opening: Anglo-Indian Defense, Queen's Indian Formation: 1.c4 e6 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 *English Opening: Anglo-Indian Defense: 1.c4 Nf6 *English Orangutan: 1.c4 Nf6 2.b4 *English Opening: Anglo-Indian Defense, Anti-Anti-Grünfeld: 1.c4 Nf6 2.Nc3 g6 3.Nf3 Bg7 4.e4 *English Opening: Anglo-Indian Defense, King's Knight Variation: 1.c4 Nf6 2.Nf3 *English Opening: Anglo-Indian Defense, Queen's Indian Formation: 1.c4 Nf6 2.Nf3 b6 *English Opening: Anglo-Indian Defense, Scandinavian Defense: 1.c4 Nf6 2.Nf3 d5 *English Opening: Anglo-Indian Defense, Scandinavian Defense, Exchange Variation: 1.c4 Nf6 2.Nf3 d5 3.cxd5 Nxd5 *English Opening: Anglo-Indian Defense, Old Indian Formation: 1.c4 Nf6 2.Nf3 d6 *English Opening: Anglo-Indian Defense, King's Indian Formation: 1.c4 Nf6 2.Nf3 g6 *English Opening: Anglo-Indian Defense, King's Indian Formation, Double Fianchetto: 1.c4 Nf6 2.Nf3 g6 3.g3 b6 4.Bg2 Bb7 *English Opening: Anglo-Indian Defense, Slav Formation: 1.c4 Nf6 2.Nf3 g6 3.g3 c6 *English Opening: Anglo-Indian Defense, Grünfeld Formation: 1.c4 Nf6 2.Nf3 g6 3.g3 d5 '''A16''' English Opening, Anglo-Indian Defence: 2.Nc3 (without: 2...c5, 2...e5, 2...e6) *English Opening: Anglo-Indian Defense, Queen's Knight Variation: 1.c4 Nf6 2.Nc3 *English Opening: Anglo-Grünfeld Defense: 1.c4 Nf6 2.Nc3 d5 *English Opening: Anglo-Indian Defense, Anglo-Grünfeld Variation: 1.c4 Nf6 2.Nc3 d5 3.cxd5 Nxd5 4.g3 g6 5.Bg2 Nb6 *English Opening: Anglo-Indian Defense, Anglo-Grünfeld Variation: 1.c4 Nf6 2.Nc3 d5 3.cxd5 Nxd5 4.g3 g6 5.Bg2 Nxc3 *English Opening: Anglo-Indian Defense, Anglo-Grünfeld Variation: 1.c4 Nf6 2.Nc3 d5 3.cxd5 Nxd5 4.Nf3 *English Opening: Anglo-Indian Defense, Anglo-Grünfeld Variation: 1.c4 Nf6 2.Nc3 d5 3.cxd5 Nxd5 4.Nf3 g6 *English Opening: Anglo-Grünfeld Defense, Korchnoi Variation: 1.c4 Nf6 2.Nc3 d5 3.cxd5 Nxd5 4.Nf3 g6 5.g3 Bg7 6.Bg2 e5 '''A17''' English Opening, [[Hedgehog (chess)|Hedgehog Defence]]: 2...e6 (without: 3.d4, 3.Nf3 c5, 3...d5 4.d4, 3...b5 4.d4, 3...Bb4 4.d4) *English Opening: Anglo-Indian Defense, Queen's Indian Formation: 1.c4 e6 2.Nc3 Nf6 3.Nf3 b6 *English Opening: Anglo-Indian Defense, Queen's Indian Variation: 1.c4 e6 2.Nc3 Nf6 3.Nf3 b6 4.e4 Bb7 5.Bd3 *English Opening: Anglo-Indian Defense, Zvjaginsev-Krasenkow Attack: 1.c4 e6 2.Nc3 Nf6 3.Nf3 Bb4 4.g4 *English Opening: Anglo-Indian Defense, Hedgehog System: 1.c4 Nf6 2.Nc3 e6 *English Opening: Anglo-Indian Defense, Nimzo-English: 1.c4 Nf6 2.Nc3 e6 3.Nf3 Bb4 '''A18''' English, Mikenas–Carls Variation: 3.e4 (without: 3...c5) *English Opening: Mikenas-Carls Variation: 1.c4 e6 2.Nc3 Nf6 3.e4 *English Opening: Mikenas-Carls Variation: 1.c4 e6 2.Nc3 Nf6 3.e4 d5 4.e5 *English Opening: Mikenas-Carls Variation: 1.c4 e6 2.Nc3 Nf6 3.e4 Nc6 '''A19''' English, Mikenas–Carls, Sicilian Variation: 3...c5 *English Opening: Mikenas-Carls, Sicilian: 1.c4 e6 2.Nc3 Nf6 3.e4 c5 *English Opening: Anglo-Indian Defense, Flohr–Mikenas–Carls Variation, Nei Gambit: 1.c4 e6 2.Nc3 Nf6 3.e4 c5 4.e5 Ng8 '''A20''' English Opening: 1...e5 (without: 2.e4, 2.Nf3 Nc6 3.Nc3, 2.Nf3 Nf6 3.Nc3, 2.Nf3 d6 3.Nc3) *English Opening: King's English Variation: 1.c4 e5 *English Opening: King's English Variation, Kahiko-Hula Gambit: 1.c4 e5 2.e3 Nf6 3.f4 exf4 4.Nf3 *English Opening: Drill Variation: 1.c4 e5 2.g3 h5 *English Opening: King's English Variation, Nimzowitsch Variation: 1.c4 e5 2.Nf3 *English Opening: King's English Variation, Nimzowitsch-Flohr Variation: 1.c4 e5 2.Nf3 e4 '''A21''' English Opening: 2.Nc3 (without: 2...Nf6, 2...Nc6, 2...Bb4 3.g3 Nf6, 2...Bb4 3.Nf3 Nc6 2...Bb4 3.e3 Nf6) *English Opening: King's English Variation, Reversed Sicilian: 1.c4 e5 2.Nc3 *English Opening: King's English Variation, Kramnik-Shirov Counterattack: 1.c4 e5 2.Nc3 Bb4 *English Opening: King's English Variation, Keres Defense: 1.c4 e5 2.Nc3 d6 3.g3 c6 *English Opening: King's English Variation: 1.c4 e5 2.Nc3 d6 3.Nf3 *English Opening: King's English Variation, Smyslov Defense: 1.c4 e5 2.Nc3 d6 3.Nf3 Bg4 *English Opening: King's English Variation, Troger Defense: 1.c4 e5 2.Nc3 Nc6 3.g3 d6 4.Bg2 Be6 '''A22''' English Opening: 2...Nf6 (without: 3.Nf3 Nc6, 3.e3 Nc6, 3.g3 Nc6, 3.g3 c6, 3.g3 g6, 3.e4 Nc6 4.Nf3) *English Opening: King's English Variation, Two Knights Variation: 1.c4 e5 2.Nc3 Nf6 *English Opening: King's English, Mazedonisch: 1.c4 e5 2.Nc3 Nf6 3.f4 *English Opening: Carls-Bremen System: 1.c4 e5 2.Nc3 Nf6 3.g3 *English Opening: King's English Variation, Two Knights Variation, Smyslov System: 1.c4 e5 2.Nc3 Nf6 3.g3 Bb4 *English Opening: King's English Variation, Two Knights Variation, Reversed Dragon: 1.c4 e5 2.Nc3 Nf6 3.g3 d5 *English Opening: King's English Variation, Bellon Gambit: 1.c4 e5 2.Nc3 Nf6 3.Nf3 e4 4.Ng5 b5 *English Opening: King's English Variation, Adhiban Gambit: 1.c4 e5 2.Nc3 Nf6 3.Nf3 e4 4.Ng5 c6 *English Opening: King's English, Erbenheimer Gambit: 1.c4 e5 2.Nc3 Nf6 3.Nf3 e4 4.Ng5 Ng4 '''A23''' English Opening, Bremen System, Keres Variation: 3.g3 c6 *English Opening: King's English Variation, Two Knights Variation, Keres Variation: 1.c4 e5 2.Nc3 Nf6 3.g3 Bc5 4.Bg2 c6 *English Opening: King's English Variation, Two Knights Variation, Keres Variation: 1.c4 e5 2.Nc3 Nf6 3.g3 c6 '''A24''' English Opening, Bremen System with 1...e5 2.Nc3 Nf6 3.g3 g6 (without: 4.Bg2 Bg7 5.d3 d6): 3.g3 g6 *English Opening: King's English Variation, Two Knights Variation, Fianchetto Line: 1.c4 e5 2.Nc3 Nf6 3.g3 g6 '''A25''' English Opening, Sicilian Reversed: 2...Nc6 (without 3.e3 Nf6 4.Nf3) *English Opening: King's English Variation, Reversed Closed Sicilian: 1.c4 e5 2.Nc3 Nc6 *English Opening: King's English Variation, Taimanov Variation: 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 *English Opening: King's English Variation, Closed System: 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 *English Opening: King's English Variation, Bremen-Hort Variation: 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.e3 d6 6.Nge2 Be6 *English Opening: Closed, Taimanov Variation: 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.e3 d6 6.Nge2 Nh6 *English Opening: King's English Variation, Hungarian Attack: 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Rb1 *English Opening: Closed, Taimanov Variation: 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Rb1 Nh6 5.Bg2 Bg7 '''A26''' English Opening, Closed System: 3.g3 g6 4.Bg2 Bg7 5.d3 d6 *English Opening: King's English Variation, Closed System, Full Symmetry: 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 *English Opening: King's English Variation, Botvinnik System: 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.e4 '''A27''' English Opening, Three Knights System: 3.Nf3 (without: 3...Nf6) *English Opening: King's English Variation, Three Knights System: 1.c4 e5 2.Nc3 Nc6 3.Nf3 '''A28''' English Opening, Four Knights System: 3...Nf6 (without 4.g3) *English Opening: King's English Variation, Four Knights Variation: 1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 *English Opening: King's English Variation, Four Knights Variation, Korchnoi Line: 1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 4.a3 *English Opening: King's English Variation, Four Knights Variation, Flexible Line: 1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 4.d3 *English Opening: King's English Variation, Four Knights Variation, Bradley Beach Variation: 1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 4.d4 e4 *English Opening: King's English Variation, Four Knights Variation: 1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 4.d4 exd4 5.Nxd4 Bb4 6.Bg5 h6 7.Bh4 Bxc3+ 8.bxc3 Ne5 *English Opening: King's English Variation, Four Knights Variation, Quiet Line: 1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 4.e3 *English Opening: King's English Variation, Four Knights Variation, Quiet Line: 1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 4.e3 Bb4 5.Qc2 Bxc3 *English Opening: King's English Variation, Four Knights Variation, Quiet Line: 1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 4.e3 Bb4 5.Qc2 0-0 6.Nd5 Re8 7.Qf5 *English Opening: Four Knights System, Nimzowitsch Variation: 1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 4.e4 '''A29''' English Opening, Four Knights, Kingside Fianchetto: 4.g3 *English Opening: King's English Variation, Four Knights Variation, Fianchetto Line: 1.c4 e5 2.g3 Nf6 3.Bg2 d5 4.cxd5 Nxd5 5.Nf3 Nc6 *English Opening: King's English Variation, Four Knights Variation, Fianchetto Line: 1.c4 e5 2.g3 Nf6 3.Bg2 d5 4.cxd5 Nxd5 5.Nf3 Nc6 6.d3 *English Opening: King's English Variation, Four Knights Variation, Fianchetto Line: 1.c4 e5 2.g3 Nf6 3.Bg2 d5 4.cxd5 Nxd5 5.Nf3 Nc6 6.d3 Be7 7.0-0 0-0 *English Opening: King's English Variation, Four Knights Variation, Fianchetto Line: 1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 4.g3 *English Opening: King's English Variation, Four Knights Variation, Fianchetto Line, with Bc5: 1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 4.g3 d5 5.cxd5 Nxd5 6.Bg2 Bc5 *English Opening: King's English Variation, Four Knights Variation, Fianchetto Line, with Nb6: 1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 4.g3 d5 5.cxd5 Nxd5 6.Bg2 Nb6 '''A30''' English Opening, Symmetrical Defence: 1...c5 (without: 2.e4, 2.g3 g6 3.Nc3, 2.g3 Nc6 3.Nc3, 2.Nf3 Nc6 3.Nc3, 2.e3 Nf6 4.d4) *English Opening: Symmetrical Variation: 1.c4 c5 *English Opening: Wing Gambit: 1.c4 c5 2.b4 *English Opening: Symmetrical Variation: 1.c4 c5 2.Nf3 *English Opening: Symmetrical Variation, Napolitano Gambit: 1.c4 c5 2.Nf3 Nf6 3.b4 *English Opening: Symmetrical, Hedgehog, Flexible Formation: 1.c4 e6 2.Nf3 c5 3.Nc3 Nf6 4.g3 b6 5.Bg2 Bb7 6.0-0 Be7 7.d4 cxd4 8.Qxd4 d6 9.Rd1 a6 10.b3 Nbd7 *English Opening: Symmetrical Variation, Hedgehog Defense: 1.c4 e6 2.Nf3 Nf6 3.Nc3 c5 4.g3 b6 5.Bg2 Bb7 6.0-0 Be7 '''A31''' English Opening, Symmetrical, Benoni formation: 2.Nf3 Nf6 3.d4 (without: 3...cxd4 4.Nxd4 e6, 3...cxd4 4.Nxd4 a6 5.Nc3 e6, 3...cxd4 4.Nxd4 Nc6 5.Nc3 e6) *English Opening: Symmetrical Variation, Anti-Benoni Variation: 1.c4 Nf6 2.d4 c5 3.Nf3 '''A32''' English Opening, Symmetrical: 3...cxd4 4.Nxd4 e6 *English Opening: Symmetrical Variation, Anti-Benoni Variation, Spielmann Defense: 1.c4 e6 2.d4 c5 3.Nf3 cxd4 4.Nxd4 Nf6 '''A33''' English Opening, Symmetrical: 5.Nc3 Nc6 *English Opening: Symmetrical Variation, Anti-Benoni Variation, Spielmann Defense: 1.c4 e6 2.Nf3 Nf6 3.Nc3 c5 4.d4 cxd4 5.Nxd4 Nc6 *English Opening: Symmetrical Variation, Anti-Benoni Variation, Geller Variation: 1.c4 e6 2.Nf3 Nf6 3.Nc3 c5 4.d4 Nc6 5.g3 cxd4 6.Nxd4 Qb6 '''A34''' English Opening, Symmetrical: 2.Nc3 (without 2...Nc6, 2...Nf6 3.Nf3 Nc6, 2...Nf6 3.e4 e6, 2...e6 3.Nf3 Nf6, 4.g3 Nc6) *English Opening: Symmetrical Variation, Normal Variation: 1.c4 c5 2.Nc3 *English Opening: Symmetrical Variation, Three Knights Variation: 1.c4 c5 2.Nc3 Nf6 3.Nf3 *English Opening: Symmetrical Variation, Fianchetto Variation: 1.c4 Nf6 2.Nc3 c5 3.g3 *English Opening: Symmetrical Variation, Rubinstein Variation: 1.c4 Nf6 2.Nc3 c5 3.g3 d5 4.cxd5 Nxd5 5.Bg2 Nc7 '''A35''' English Opening, Symmetrical: 2...Nc6 (without 3.g3, 3.e4, 3.Nf3 Nf6, 4.g3 e6, 3.Nf3 Nf6 4.d4 cxd4 5.Nxd4, 3.Nf3 e5 4.g3 g6 5.Bg2 Bg7) *English Opening: Symmetrical Variation, Two Knights Variation: 1.c4 c5 2.Nc3 Nc6 *English Opening: Symmetrical Variation, Four Knights Variation: 1.c4 Nf6 2.Nf3 c5 3.Nc3 Nc6 '''A36''' English Opening, Symmetrical: 3.g3 *English Opening: Symmetrical Variation, Botvinnik System: 1.c4 c5 2.e4 Nc6 3.Nc3 g6 4.g3 Bg7 5.Bg2 *English Opening: Symmetrical Variation, Ultra-Symmetrical Variation: 1.c4 c5 2.g3 g6 3.Bg2 Bg7 4.Nc3 Nc6 *English Opening: Symmetrical Variation, Two Knights, Fianchetto Variation: 1.c4 c5 2.Nc3 Nc6 3.g3 *English Opening: Symmetrical Variation, Botvinnik System Reversed, with e3: 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.e3 e5 '''A37''' English Opening, Symmetrical: 3...g6 4.Bg2 Bg7 5.Nf3 *English Opening: Symmetrical Variation, Three Knights, Fianchetto Variation: 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 *English Opening: Symmetrical Variation, Botvinnik System Reversed, with Nf3: 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 e5 '''A38''' English Opening, Symmetrical: 5...Nf6 *English Opening: Symmetrical Variation, Double Fianchetto: 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6 6.0-0 0-0 7.b3 *English Opening: Symmetrical Variation, Full Symmetry Line: 1.c4 Nf6 2.Nf3 c5 3.Nc3 Nc6 4.g3 g6 5.Bg2 Bg7 *English Opening: Symmetrical Variation, Duchamp Variation: 1.c4 Nf6 2.Nf3 g6 3.g3 Bg7 4.Bg2 0-0 5.0-0 c5 6.Nc3 Nc6 7.d3 '''A39''' English, symmetrical, main line with d4: 6.0-0 0-0 7.d4 or 6.d4 cxd4 7.Nxd4 0-0 8.0-0 *English Opening: Symmetrical Variation, Mecking Variation: 1.c4 Nf6 2.Nf3 c5 3.Nc3 Nc6 4.g3 g6 5.Bg2 Bg7 6.0-0 0-0 7.d4 ===A40–A44=== 1.d4 without 1...d5, 1...Nf6 or 1...f5: Atypical replies to 1.d4 '''A40''' [[Queen's Pawn Game]] *English Defense: Hartlaub Gambit Declined: 1.c4 e6 2.d4 b6 3.Nc3 Bb7 4.e4 f5 5.d5 *English Defense: Hartlaub Gambit Accepted: 1.c4 e6 2.d4 b6 3.Nc3 Bb7 4.e4 f5 5.exf5 Nf6 *Queen's Pawn Game: 1.d4 *Polish Defense: 1.d4 b5 *Polish Defense: Spassky Gambit Accepted: 1.d4 b5 2.e4 Bb7 3.Bxb5 *English Defense: 1.d4 b6 *English Defense: Eastbourne Gambit: 1.d4 b6 2.c4 Bb7 3.Nc3 e5 *Queen's Pawn Game: Anglo-Slav Opening: 1.d4 c6 2.c4 d6 *Slav Indian: Kudischewitsch Gambit: 1.d4 c6 2.Nf3 Nf6 3.c4 b5 *Englund Gambit: 1.d4 e5 *Englund Gambit Declined: 1.d4 e5 2.d5 *Englund Gambit Declined: Diemer Counterattack: 1.d4 e5 2.d5 Bc5 3.e4 Qh4 *Englund Gambit: Hartlaub-Charlick Gambit: 1.d4 e5 2.dxe5 d6 *Englund Gambit: Soller Gambit: 1.d4 e5 2.dxe5 f6 *Englund Gambit: Felbecker Gambit: 1.d4 e5 2.dxe5 Nc6 3.Nf3 Bc5 *Englund Gambit: Soller Gambit Deferred: 1.d4 e5 2.dxe5 Nc6 3.Nf3 f6 *Englund Gambit: Zilbermints Gambit: 1.d4 e5 2.dxe5 Nc6 3.Nf3 Nge7 *Englund Gambit: Main Line: 1.d4 e5 2.dxe5 Nc6 3.Nf3 Qe7 *Englund Gambit: Stockholm Variation: 1.d4 e5 2.dxe5 Nc6 3.Nf3 Qe7 4.Qd5 *Englund Gambit: Mosquito Gambit: 1.d4 e5 2.dxe5 Qh4 *Englund Gambit Declined: Reversed French: 1.d4 e5 2.e3 *Englund Gambit Declined: Reversed Alekhine: 1.d4 e5 2.Nf3 *Englund Gambit Declined: Reversed Krebs: 1.d4 e5 2.Nf3 e4 *Englund Gambit Declined: Reversed Mokele Mbembe: 1.d4 e5 2.Nf3 e4 3.Ne5 *Englund Gambit Declined: Reversed Brooklyn: 1.d4 e5 2.Nf3 e4 3.Ng1 *Horwitz Defense: 1.d4 e6 *English Defense: 1.d4 e6 2.c4 b6 *English Defense: Perrin Variation: 1.d4 e6 2.c4 b6 3.e4 Bb7 4.Bd3 Nc6 *English Defense: Poli Gambit: 1.d4 e6 2.c4 b6 3.e4 Bb7 4.f3 f5 5.exf5 Nh6 *Kangaroo Defense: 1.d4 e6 2.c4 Bb4+ *Kangaroo Defense: Keres Defense, Transpositional Variation: 1.d4 e6 2.c4 Bb4+ 3.Nc3 *Benoni Defense: Franco-Sicilian Hybrid: 1.d4 e6 2.c4 c5 3.d5 exd5 4.cxd5 d6 5.Nc3 g6 6.e4 Bg7 7.Nf3 Ne7 *Horwitz Defense: Zilbermints Gambit: 1.d4 e6 2.c4 e5 *Borg Defense: Borg Gambit: 1.d4 g5 *Queen's Pawn Game: Modern Defense: 1.d4 g6 *Pterodactyl Defense: Central, Benoni Pterodactyl: 1.d4 g6 2.c4 Bg7 3.e4 c5 4.d5 Qa5+ *Modern Defense: Beefeater Variation: 1.d4 g6 2.c4 Bg7 3.Nc3 c5 4.d5 Bxc3+ 5.bxc3 f5 *Pterodactyl Defense: Fianchetto, Queen Pteranodon: 1.d4 g6 2.c4 Bg7 3.Nc3 c5 4.d5 Bxc3+ 5.bxc3 Qa5 *Pterodactyl Defense: Central, Benoni Beefeater Pterodactyl: 1.d4 g6 2.c4 Bg7 3.Nc3 c5 4.d5 d6 5.e4 Bxc3+ 6.bxc3 Qa5 *Pterodactyl Defense: Fianchetto, Queen Benoni Pterodactyl: 1.d4 g6 2.c4 Bg7 3.Nc3 c5 4.d5 Qa5 *Pterodactyl Defense: Queen Pterodactyl, Quiet Line: 1.d4 g6 2.c4 Bg7 3.Nc3 c5 4.e3 *Modern Defense: Lizard Defense, Pirc-Diemer Gambit: 1.d4 g6 2.h4 Nf6 3.h5 *Colle System: Siroccopteryx Variation: 1.d4 g6 2.Nf3 Bg7 3.e3 c5 4.Bd3 cxd4 5.Nxd4 Qa5+ *Colle System: Pterodactyl Variation: 1.d4 g6 2.Nf3 Bg7 3.e3 c5 4.Bd3 Qa5+ *Pterodactyl Defense: Fianchetto, Queen Pterodactyl: 1.d4 g6 2.Nf3 Bg7 3.g3 c5 4.Bg2 Qa5+ *Australian Defense: 1.d4 Na6 *Mikenas Defense: 1.d4 Nc6 *Mikenas Defense: Lithuanian Variation: 1.d4 Nc6 2.c4 e5 3.d5 Nce7 *Mikenas Defense: Cannstatter Variation: 1.d4 Nc6 2.c4 e5 3.d5 Nd4 *Mikenas Defense: Pozarek Gambit: 1.d4 Nc6 2.c4 e5 3.dxe5 Nxe5 4.Nc3 Nxc4 *Montevideo Defense: 1.d4 Nc6 2.d5 Nb8 *Zaire Defense: 1.d4 Nc6 2.d5 Nb8 3.e4 Nf6 4.e5 Ng8 '''A41''' Queen's Pawn Game: 1...d6 *Queen's Pawn Game: 1.d4 d6 *Old Indian Defense: 1.d4 d6 2.c4 *Rat Defense: English Rat: 1.d4 d6 2.c4 e5 *Rat Defense: English Rat, Pounds Gambit: 1.d4 d6 2.c4 e5 3.dxe5 Be6 *Rat Defense: English Rat, Lisbon Gambit: 1.d4 d6 2.c4 e5 3.dxe5 Nc6 *Wade Defense: 1.d4 d6 2.Nf3 Bg4 *Zukertort Opening: Wade Defense, Chigorin Plan: 1.d4 d6 2.Nf3 Bg4 3.c4 Nd7 4.Qb3 Rb8 *Robatsch Defense: 1.d4 d6 2.Nf3 g6 3.c4 Bg7 4.e4 Bg4 *Modern Defense: Neo-Modern Defense: 1.d4 g6 2.c4 Bg7 3.e4 e5 *Modern Defense: 1.d4 g6 2.c4 Bg7 3.Nc3 d6 '''A42''' [[Modern Defence]], Averbakh System, also [[Wade Defence]]: 2.c4 g6 3.Nc3 Bg7 4.e4 *Modern Defense: Averbakh Variation, Pseudo-Sämisch: 1.d4 g6 2.c4 Bg7 3.e4 d6 4.Be3 Nf6 5.f3 *Pterodactyl Defense: Central, Bogolubovia: 1.d4 g6 2.c4 Bg7 3.e4 d6 4.Nc3 c5 5.Nge2 Qa5 *Modern Defense: Averbakh System: 1.d4 g6 2.c4 Bg7 3.Nc3 d6 4.e4 *Modern Defense: Randspringer Variation: 1.d4 g6 2.c4 Bg7 3.Nc3 d6 4.e4 f5 *Modern Defense: Kotov Variation: 1.d4 g6 2.c4 Bg7 3.Nc3 d6 4.e4 Nc6 *Pterodactyl Defense: 1.Nf3 c5 2.c4 g6 3.d4 Bg7 4.e4 Qa5+ 5.Nc3 d6 '''A43''' [[Old Benoni Defence]]: 1...c5 *Benoni Defense: Old Benoni: 1.d4 c5 *Benoni Defense: Zilbermints-Benoni Gambit: 1.d4 c5 2.b4 *Queen's Pawn Game: Liedmann Gambit: 1.d4 c5 2.c4 cxd4 3.e3 *Benoni Defense: Old Benoni: 1.d4 c5 2.d5 *Benoni Defense: Old Benoni: 1.d4 c5 2.d5 d6 *Benoni Defense: Old Benoni, Schmid Variation: 1.d4 c5 2.d5 d6 3.Nc3 g6 *Benoni Defense: Old Benoni, Mujannah Formation: 1.d4 c5 2.d5 f5 *Benoni Defense: Benoni-Staunton Gambit: 1.d4 c5 2.d5 f5 3.e4 *Benoni Defense: Snail Variation: 1.d4 c5 2.d5 Na6 *Benoni Defense: Benoni-Indian Defense: 1.d4 c5 2.d5 Nf6 *Benoni Defense: Woozle: 1.d4 c5 2.d5 Nf6 3.Nc3 Qa5 *Benoni Defense: Benoni Gambit Accepted: 1.d4 c5 2.dxc5 *Benoni Defense: Cormorant Gambit: 1.d4 c5 2.dxc5 b6 *Benoni Defense: Benoni Gambit, Schlenker Defense: 1.d4 c5 2.dxc5 Na6 *Benoni Defense: Zilbermints-Benoni Gambit: 1.d4 c5 2.Nf3 cxd4 3.b4 *Benoni Defense: Zilbermints-Benoni Gambit, Tamarkin Countergambit: 1.d4 c5 2.Nf3 cxd4 3.b4 e5 *Benoni Defense: Benoni-Indian Defense, Kingside Move Order: 1.d4 Nf6 2.Nf3 c5 3.d5 *Indian Defense: Pseudo-Benko: 1.d4 Nf6 2.Nf3 c5 3.d5 b5 *Benoni Defense: Hawk Variation: 1.d4 Nf6 2.Nf3 c5 3.d5 c4 *Benoni Defense: French Benoni: 1.e4 e6 2.d4 c5 3.d5 '''A44''' Old Benoni Defence: 2.d5 e5 *Benoni Defense: Old Benoni: 1.d4 c5 2.d5 e5 *Benoni Defense: Semi-Benoni: 1.d4 c5 2.d5 e5 3.e4 d6 ===A45–A49=== 1.d4 Nf6 without 2.c4: Atypical replies to 1...Nf6 '''A45''' [[Queen's Pawn Game]], [[Trompowsky Attack]]: 1.d4 Nf6 (without 2.Nf3) *Indian Defense: 1.d4 Nf6 *Trompowsky Attack: 1.d4 Nf6 2.Bg5 *Trompowsky Attack: Poisoned Pawn Variation: 1.d4 Nf6 2.Bg5 c5 3.d5 Qb6 4.Nc3 *Trompowsky Attack: Classical Defense: 1.d4 Nf6 2.Bg5 e6 *Trompowsky Attack: Classical Defense, Big Center Variation: 1.d4 Nf6 2.Bg5 e6 3.e4 *Trompowsky Attack: Borg Variation: 1.d4 Nf6 2.Bg5 Ne4 3.Bf4 g5 *Trompowsky Attack: Edge Variation: 1.d4 Nf6 2.Bg5 Ne4 3.Bh4 *Trompowsky Attack: Edge Variation, Hergert Gambit: 1.d4 Nf6 2.Bg5 Ne4 3.Bh4 c6 4.Nd2 Qa5 5.c3 Nxd2 6.Qxd2 d5 7.e4 *Trompowsky Attack: Edge Variation, Hergert Gambit: 1.d4 Nf6 2.Bg5 Ne4 3.Bh4 d5 4.f3 Nf6 5.Nc3 Bf5 6.e4 *Trompowsky Attack: Raptor Variation: 1.d4 Nf6 2.Bg5 Ne4 3.h4 *Trompowsky Attack: Raptor Variation, Hergert Gambit: 1.d4 Nf6 2.Bg5 Ne4 3.h4 Nxg5 4.hxg5 e5 *Indian Defense: Pawn Push Variation: 1.d4 Nf6 2.d5 *Indian Defense: Omega Gambit: 1.d4 Nf6 2.e4 *Indian Defense: Omega Gambit, Arafat Gambit: 1.d4 Nf6 2.e4 Nxe4 3.Bd3 Nf6 4.Bg5 *Paleface Attack: 1.d4 Nf6 2.f3 *Indian Defense: Paleface Attack, Blackmar-Diemer Gambit Deferred: 1.d4 Nf6 2.f3 d5 3.e4 *Indian Defense: Gedult Attack, Gedult Attack: 1.d4 Nf6 2.f3 d5 3.g4 *Queen's Pawn Game: Veresov, Richter Attack: 1.d4 Nf6 2.f3 d5 3.Nc3 *Canard Opening: 1.d4 Nf6 2.f4 *Indian Defense: Tartakower Attack: 1.d4 Nf6 2.g3 *Indian Defense: Gibbins-Weidenhagen Gambit: 1.d4 Nf6 2.g4 *Indian Defense: Gibbins-Weidenhagen Gambit, Oshima Defense: 1.d4 Nf6 2.g4 e5 *Indian Defense: Gibbins-Weidenhagen Gambit Accepted: 1.d4 Nf6 2.g4 Nxg4 *Indian Defense: Gibbins-Weidenhagen Gambit, Stummer Gambit: 1.d4 Nf6 2.g4 Nxg4 3.e4 d6 4.Be2 Nf6 5.Nc3 *Indian Defense: Gibbins-Weidenhagen Gambit, Maltese Falcon: 1.d4 Nf6 2.g4 Nxg4 3.f3 Nf6 4.e4 *Indian Defense: Reversed Chigorin Defense: 1.d4 Nf6 2.Nc3 c5 *Queen's Pawn Game: Chigorin Variation: 1.d4 Nf6 2.Nc3 d5 *Amazon Attack: Siberian Attack: 1.d4 Nf6 2.Nc3 d5 3.Qd3 *Indian Defense: Maddigan Gambit: 1.d4 Nf6 2.Nc3 e5 *Indian Defense: Lazard Gambit: 1.d4 Nf6 2.Nd2 e5 '''A46''' Queen's Pawn Game, [[Torre Attack]]: 2.Nf3 *Indian Defense: Knights Variation: 1.d4 Nf6 2.Nf3 *Indian Defense: Knights Variation, Alburt-Miles Variation: 1.d4 Nf6 2.Nf3 a6 *Indian Defense: Polish Variation: 1.d4 Nf6 2.Nf3 b5 *Indian Defense: Spielmann-Indian: 1.d4 Nf6 2.Nf3 c5 *Indian Defense: Czech-Indian: 1.d4 Nf6 2.Nf3 c6 *Indian Defense: Wade-Tartakower Defense: 1.d4 Nf6 2.Nf3 d6 *Indian Defense: London System: 1.d4 Nf6 2.Nf3 e6 3.Bf4 *Torre Attack: Classical Defense: 1.d4 Nf6 2.Nf3 e6 3.Bg5 *Torre Attack: Classical Defense, Petrosian Gambit: 1.d4 Nf6 2.Nf3 e6 3.Bg5 c5 4.e3 b6 5.d5 *Torre Attack: Wagner Gambit: 1.d4 Nf6 2.Nf3 e6 3.Bg5 c5 4.e4 *Queen's Pawn Game: Torre Attack, Breyer Variation: 1.d4 Nf6 2.Nf3 e6 3.Bg5 d5 4.e3 c5 5.c3 Qb6 *Torre Attack: Classical Defense, Nimzowitsch Variation: 1.d4 Nf6 2.Nf3 e6 3.Bg5 h6 *Yusupov-Rubinstein System: 1.d4 Nf6 2.Nf3 e6 3.e3 *Queen's Pawn Game: Veresov Attack, Classical Defense: 1.d4 Nf6 2.Nf3 e6 3.Nc3 d5 4.Bg5 *Döry Defense: 1.d4 Nf6 2.Nf3 Ne4 '''A47''' [[Queen's Indian Defence]]: 2...b6 *Pseudo Queen's Indian Defense: 1.d4 Nf6 2.Nf3 b6 *Indian Defense: Schnepper Gambit: 1.d4 Nf6 2.Nf3 b6 3.c3 e5 *Marienbad System: 1.d4 Nf6 2.Nf3 b6 3.g3 Bb7 4.Bg2 c5 *Marienbad System: Berg Variation: 1.d4 Nf6 2.Nf3 b6 3.g3 Bb7 4.Bg2 c5 5.c4 cxd4 6.Qxd4 '''A48''' [[King's Indian]], [[East Indian Defence]]: 2...g6 *East Indian Defense: 1.d4 Nf6 2.Nf3 g6 *London System: 1.d4 Nf6 2.Nf3 g6 3.Bf4 *Torre Attack: Fianchetto Defense: 1.d4 Nf6 2.Nf3 g6 3.Bg5 *Torre Attack: Fianchetto Defense, Euwe Variation: 1.d4 Nf6 2.Nf3 g6 3.Bg5 Bg7 4.Nbd2 c5 *Queen's Pawn Game: Torre Attack, Grünfeld Variation, Main Line: 1.d4 Nf6 2.Nf3 g6 3.Bg5 Bg7 4.Nbd2 d5 5.e3 0-0 *Indian Defense: Colle System, King's Indian Variation: 1.d4 Nf6 2.Nf3 g6 3.e3 Bg7 4.Bd3 d6 *Queen's Pawn Game: Barry Attack: 1.d4 Nf6 2.Nf3 g6 3.Nc3 d5 4.Bf4 *Queen's Pawn Game: Barry Attack: 1.d4 Nf6 2.Nf3 g6 3.Nc3 d5 4.Bf4 Bg7 *Queen's Pawn Game: Barry Attack, Grünfeld Variation: 1.d4 Nf6 2.Nf3 g6 3.Nc3 d5 4.Bf4 Bg7 5.e3 0-0 6.Be2 *Queen's Pawn Game: Barry Attack, Tarzan Attack: 1.d4 Nf6 2.Nf3 g6 3.Nc3 d5 4.Bf4 Bg7 5.Qd2 '''A49''' King's Indian, Fianchetto without c4: 3.g3 *Indian Defense: Przepiorka Variation: 1.d4 Nf6 2.Nf3 g6 3.g3 ===A50–A55=== 1.d4 Nf6 2.c4 without 2...e6 or 2...g6: Atypical [[Indian defences|Indian systems]] '''A50''' [[Queen's Pawn Game]]: 1.d4 Nf6 2.c4 (without 2...d6 2...e5, 2...e6, 2...g6 or 2...c5) *Indian Defense: Normal Variation: 1.d4 Nf6 2.c4 *Indian Defense: Pyrenees Gambit: 1.d4 Nf6 2.c4 b5 *Queen's Indian Accelerated: 1.d4 Nf6 2.c4 b6 *Slav Indian: 1.d4 Nf6 2.c4 c6 *Indian Defense: Medusa Gambit: 1.d4 Nf6 2.c4 g5 *Mexican Defense: 1.d4 Nf6 2.c4 Nc6 *Mexican Defense: Horsefly Gambit: 1.d4 Nf6 2.c4 Nc6 3.d5 Ne5 4.f4 '''A51''' [[Budapest Gambit]] Declined: 2...e5 *Indian Defense: Budapest Defense: 1.d4 Nf6 2.c4 e5 *Indian Defense: Budapest Defense, Fajarowicz Variation: 1.d4 Nf6 2.c4 e5 3.dxe5 Ne4 *Indian Defense: Budapest Defense, Fajarowicz Defense, Bonsdorf Variation: 1.d4 Nf6 2.c4 e5 3.dxe5 Ne4 4.a3 b6 *Indian Defense: Budapest Defense, Fajarowicz-Steiner Variation: 1.d4 Nf6 2.c4 e5 3.dxe5 Ne4 4.Qc2 '''A52''' Budapest Gambit: 3.dxe5 Ng4 *Indian Defense: Budapest Defense: 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4 *Indian Defense: Budapest Defense, Rubinstein Variation: 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4 4.Bf4 *Indian Defense: Budapest Defense, Alekhine Variation: 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4 4.e4 *Indian Defense: Budapest Defense, Alekhine Variation, Tartakower Defense: 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4 4.e4 d6 *Indian Defense: Budapest Defense, Alekhine Variation, Abonyi Variation: 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4 4.e4 Nxe5 5.f4 Nec6 *Indian Defense: Budapest Defense, Adler Variation: 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4 4.Nf3 '''A53''' [[Old Indian Defence]]: 2...d6 *Old Indian Defense: 1.d4 Nf6 2.c4 d6 *Old Indian Defense: Aged Gibbon Gambit: 1.d4 Nf6 2.c4 d6 3.g4 *Old Indian Defense: Janowski Variation: 1.d4 Nf6 2.c4 d6 3.Nc3 Bf5 *Old Indian Defense: Janowski Variation, Grinberg Gambit: 1.d4 Nf6 2.c4 d6 3.Nc3 Bf5 4.e4 *Old Indian Defense: Janowski Variation, Main Line: 1.d4 Nf6 2.c4 d6 3.Nc3 Bf5 4.f3 *Old Indian Defense: Janowski Variation, Fianchetto Variation: 1.d4 Nf6 2.c4 d6 3.Nc3 Bf5 4.g3 *Old Indian Defense: Czech Variation, with Nc3: 1.d4 Nf6 2.c4 d6 3.Nc3 c6 *Old Indian Defense: Czech Variation, with Nf3: 1.d4 Nf6 2.c4 d6 3.Nf3 c6 '''A54''' Old Indian, Ukrainian Variation: 3.Nc3 e5 *Old Indian Defense: Ukrainian Variation: 1.d4 Nf6 2.c4 d6 3.Nc3 e5 *Old Indian Defense: Duz-Khotimirsky Variation: 1.d4 Nf6 2.c4 d6 3.Nc3 e5 4.e3 Nbd7 5.Bd3 *Old Indian Defense: Two Knights Variation: 1.d4 Nf6 2.c4 d6 3.Nc3 e5 4.Nf3 *Old Indian Defense: Tartakower-Indian: 1.d4 Nf6 2.c4 d6 3.Nf3 Bg4 '''A55''' Old Indian, Main line: 4.Nf3 Nbd7 5.e4 *Old Indian Defense: Normal Variation: 1.d4 Nf6 2.c4 d6 3.Nc3 Nbd7 4.e4 e5 5.Nf3 === A56–A79 === [[Benoni Defense|Benoni Defence]] (and [[Benko Gambit]]): 1.d4 Nf6 2.c4 c5 '''A56''' [[Benoni Defence]]: 1.d4 Nf6 2.c4 c5 *Benoni Defense: 1.d4 Nf6 2.c4 c5 *Benoni Defense: Hromádka System: 1.d4 Nf6 2.c4 c5 3.d5 d6 *Benoni Defense: Czech Benoni Defense: 1.d4 Nf6 2.c4 c5 3.d5 e5 *Benoni Defense: King's Indian System: 1.d4 Nf6 2.c4 c5 3.d5 e5 4.Nc3 d6 5.e4 g6 *Vulture Defense: 1.d4 Nf6 2.c4 c5 3.d5 Ne4 *Benoni Defense: Weenink Variation: 1.d4 Nf6 2.c4 c5 3.dxc5 e6 *Grünfeld Defense: Three Knights Variation, Burille Variation, Reversed Tarrasch: 1.d4 Nf6 2.c4 c5 3.e3 g6 4.Nc3 Bg7 5.Nf3 0-0 6.Be2 cxd4 7.exd4 d5 8.0-0 Nc6 '''A57''' [[Benko Gambit]]: 3.d5 b5 *Benko Gambit: 1.d4 Nf6 2.c4 c5 3.d5 b5 *Benko Gambit Declined: Sosonko Variation: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.a4 *Benko Gambit Declined: Bishop Attack: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.Bg5 *Benko Gambit Accepted: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 *Benko Gambit Accepted: Pawn Return Variation: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.b6 *Benko Gambit Accepted: Modern Variation: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.e3 *Benko Gambit Accepted: Dlugy Variation: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.f3 *Benko Gambit: Zaitsev System: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.Nc3 *Benko Gambit: Zaitsev Variation, Nescafe Frappe Attack: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.Nc3 axb5 6.e4 b4 7.Nb5 *Benko Gambit: Nescafe Frappe Attack: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.Nc3 axb5 6.e4 b4 7.Nb5 d6 8.Bc4 *Benko Gambit Declined: Hjørring Countergambit: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.e4 *Benko Gambit Declined: Pseudo-Sämisch: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.f3 *Benko Gambit: Mutkin Countergambit: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.g4 *Benko Gambit Declined: Quiet Line: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.Nd2 *Benko Gambit Declined: Main Line: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.Nf3 '''A58''' Benko Gambit Accepted: 4.cxb5 a6 5.bxa6 *Benko Gambit Accepted: Fully Accepted Variation: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6 *Benko Gambit: Fianchetto Variation: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6 Bxa6 6.Nc3 d6 7.Nf3 g6 8.g3 *Benko Gambit: Nd2 Variation: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6 Bxa6 6.Nc3 d6 7.Nf3 g6 8.Nd2 *Benko Gambit Accepted: Central Storming Variation: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6 g6 6.Nc3 Bxa6 7.f4 *Benko Gambit Accepted: Fianchetto Variation: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6 g6 6.Nc3 Bxa6 7.g3 d6 8.Bg2 Bg7 9.Nf3 '''A59''' [[Benko Gambit, 7.e4]]: 5...Bxa6 6.Nc3 d6 7.e4 *Benko Gambit Accepted: Yugoslav: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6 Bxa6 6.Nc3 d6 7.e4 *Benko Gambit: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6 g6 6.Nc3 Bxa6 7.e4 Bxf1 8.Kxf1 d6 9.g3 *Benko Gambit Accepted: Yugoslav: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6 g6 6.Nc3 Bxa6 7.e4 Bxf1 8.Kxf1 d6 9.Nge2 *Benko Gambit Accepted: King Walk Variation: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6 g6 6.Nc3 Bxa6 7.Nf3 d6 8.e4 Bxf1 9.Kxf1 Bg7 10.g3 0-0 11.Kg2 '''A60''' Benoni Defence: 3.d5 e6 *Benoni Defense: Modern Variation: 1.d4 Nf6 2.c4 c5 3.d5 e6 *Benoni Defense: Modern Variation, Snake Variation: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 Bd6 '''A61''' Benoni Defence: 4.Nc3 exd5 5.cxd5 d6 6.Nf3 g6 *Benoni Defense: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 *Benoni Defense: Uhlmann Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.Bg5 *Benoni Defense: Fianchetto Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.g3 *Benoni Defense: Knight's Tour Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.Nd2 '''A62''' Benoni, Fianchetto Variation without 9...Nbd7: 7.g3 Bg7 8.Bg2 0-0 *Benoni Defense: Fianchetto Variation: 1.d4 Nf6 2.c4 e6 3.g3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.Bg2 Bg7 8.Nf3 0-0 '''A63''' Benoni, Fianchetto Variation, 9...Nbd7: 9.Nbd7 *Benoni Defense: Fianchetto Variation, Hastings Defense: 1.d4 Nf6 2.c4 e6 3.g3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.Bg2 Bg7 8.Nf3 0-0 9.0-0 Nbd7 '''A64''' Benoni, Fianchetto Variation, 11...Re8: 9...Nbd7: 10.Nd2 a6 11.a4 Re8 *Benoni Defense: Fianchetto Variation, Hastings Defense, Main Line: 1.d4 Nf6 2.c4 e6 3.g3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.Bg2 Bg7 8.Nf3 0-0 9.0-0 a6 10.a4 Nbd7 11.Nd2 Re8 '''A65''' Benoni, 6.e4: 4.Nc3 exd5 5.cxd5 d6 6.e4 *Benoni Defense: King's Pawn Line: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 '''A66''' Benoni, Pawn Storm Variation: 6...g6 7.f4 *Benoni Defense: Pawn Storm Variation: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4 *Benoni Defense: Mikenas Variation: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4 Bg7 8.e5 '''A67''' [[Benoni, Taimanov Variation]]: 7...Bg7 8.Bb5+ *Benoni Defense: Taimanov Variation: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4 Bg7 8.Bb5+ '''A68''' Benoni, Four Pawns Attack: 7...Bg7 8.Nf3 0-0 *Benoni Defense: Four Pawns Attack: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4 Bg7 8.Nf3 0-0 '''A69''' Benoni, Four Pawns Attack, Main line: 9.Be2 Re8 *Benoni Defense: Four Pawns Attack, Main Line: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f4 0-0 6.Nf3 c5 7.d5 e6 8.Be2 exd5 9.cxd5 Re8 '''A70''' [[Benoni, Classical]] with e4 and Nf3: 6...g6 7.Nf3 *Benoni Defense: Classical Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.e4 *Benoni Defense: Classical Variation, Traditional Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.e4 Bg7 8.Be2 *Benoni Defense: Classical Variation, New York Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.e4 Bg7 8.h3 '''A71''' Benoni, Classical, 8.Bg5: 7... Bg7 8.Bg5 *Benoni Defense: Classical Variation, Averbakh-Grivas Attack: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.e4 Bg7 8.Bg5 '''A72''' Benoni, Classical without 9.0-0: 7...Bg7 8.Be2 0-0 *Benoni Defense: Classical Variation: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 0-0 '''A73''' Benoni, Classical, 9.0-0: 9.0-0 *Benoni Defense: Classical Variation, Main Line: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 0-0 9.0-0 '''A74''' Benoni, Classical, 9...a6, 10.a4: 9...a6 10.a4 *Benoni Defense: Classical Variation, Full Line: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 0-0 9.0-0 a6 10.a4 '''A75''' Benoni, Classical with 9...a6 and 10...Bg4: 9...a6 10.a4 Bg4 *Benoni Defense: Classical Variation, Argentine Counterattack: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.e4 Bg7 8.Be2 0-0 9.0-0 a6 10.a4 Bg4 '''A76''' Benoni, Classical, 9...Re8: 9...Re8 *Benoni Defense: Classical Variation, Czerniak Defense: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 0-0 9.0-0 Re8 '''A77''' Benoni, Classical, 9...Re8, 10.Nd2: 10.Nd2 *Benoni Defense: Classical Variation, Czerniak Defense, Tal Line: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 0-0 9.0-0 Re8 10.Nd2 '''A78''' Benoni, Classical with 9...Re8 and 10...Na6: 10...Na6 *Benoni Defense: Classical Variation, Czerniak Defense: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.e4 Bg7 8.Be2 0-0 9.0-0 Re8 10.Nd2 Na6 '''A79''' Benoni, Classical, 11.f3: 11.f3 *Benoni Defense: Classical Variation, Czerniak Defense: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 0-0 9.0-0 Re8 10.Nd2 Na6 11.f3 ===A80–A99=== [[Dutch Defence]]: 1.d4 f5 '''A80''' [[Dutch Defence]]: 1.d4 f5 *Dutch Defense: 1.d4 f5 *Dutch Defense: Senechaud Gambit: 1.d4 f5 2.Bf4 e6 3.g4 *Dutch Defense: Hopton Attack: 1.d4 f5 2.Bg5 *Dutch Defense: Krejcik Gambit: 1.d4 f5 2.g4 *Dutch Defense: Hevendehl Gambit: 1.d4 f5 2.g4 e5 *Dutch Defense: Krejcik Gambit, Tate Gambit: 1.d4 f5 2.g4 fxg4 3.e4 d5 4.Nc3 *Dutch Defense: Korchnoi Attack: 1.d4 f5 2.h3 *Dutch Defense: Janzen-Korchnoi Gambit: 1.d4 f5 2.h3 Nf6 3.g4 *Dutch Defense: Raphael Variation: 1.d4 f5 2.Nc3 *Queen's Pawn Game: Veresov Attack, Dutch System: 1.d4 f5 2.Nc3 d5 *Dutch Defense: Kingfisher Gambit: 1.d4 f5 2.Nc3 d5 3.e4 *Dutch Defense: Spielmann Gambit: 1.d4 f5 2.Nc3 Nf6 3.g4 *Dutch Defense: Omega-Isis Gambit: 1.d4 f5 2.Nf3 e5 *Dutch Defense: Alapin Variation: 1.d4 f5 2.Qd3 *Dutch Defense: Manhattan Gambit, Anti-Stonewall: 1.d4 f5 2.Qd3 d5 3.g4 *Dutch Defense: Manhattan Gambit, Anti-Modern: 1.d4 f5 2.Qd3 d6 3.g4 *Dutch Defense: Manhattan Gambit, Anti-Classical Line: 1.d4 f5 2.Qd3 e6 3.g4 *Dutch Defense: Manhattan Gambit, Anti-Leningrad: 1.d4 f5 2.Qd3 g6 3.g4 '''A81''' Dutch Defence: 2.g3 *Dutch Defense: Fianchetto Attack: 1.d4 f5 2.g3 *Dutch Defense: Leningrad, Basman System: 1.d4 f5 2.g3 c6 3.Bg2 g6 4.Nf3 Bg7 5.0-0 Nh6 *Dutch Defense: Leningrad Variation, Carlsbad Variation: 1.d4 f5 2.g3 g6 3.Bg2 Bg7 4.Nh3 *Dutch Defense: Blackburne Variation: 1.d4 f5 2.g3 Nf6 3.Bg2 e6 4.Nh3 *Dutch Defense: Semi-Leningrad Variation: 1.d4 f5 2.g3 Nf6 3.Bg2 g6 '''A82''' [[Dutch, Staunton Gambit]] 2.e4 *Dutch Defense: Staunton Gambit: 1.d4 f5 2.e4 *Dutch Defense: Staunton Gambit Accepted: 1.d4 f5 2.e4 fxe4 *Dutch Defense: Blackmar's Second Gambit: 1.d4 f5 2.e4 fxe4 3.Nc3 Nf6 4.f3 *Dutch Defense: Staunton Gambit, Tartakower Variation: 1.d4 f5 2.e4 fxe4 3.Nc3 Nf6 4.g4 *Dutch Defense: Staunton Gambit, American Attack: 1.d4 f5 2.e4 fxe4 3.Nd2 *Rat Defense: Balogh Defense: 1.e4 d6 2.d4 f5 '''A83''' Dutch, Staunton Gambit, Staunton's line 2.e4 fxe4 3.Nc3 Nf6 4.Bg5 *Dutch Defense: Staunton Gambit: 1.d4 f5 2.e4 fxe4 3.Nc3 Nf6 4.Bg5 *Dutch Defense: Staunton Gambit, Nimzowitsch Variation: 1.d4 f5 2.e4 fxe4 3.Nc3 Nf6 4.Bg5 b6 *Dutch Defense: Staunton Gambit, Chigorin Variation: 1.d4 f5 2.e4 fxe4 3.Nc3 Nf6 4.Bg5 c6 *Dutch Defense: Staunton Gambit, Lasker Variation: 1.d4 f5 2.e4 fxe4 3.Nc3 Nf6 4.Bg5 g6 5.f3 *Dutch Defense: Staunton Gambit, Alekhine Variation: 1.d4 f5 2.e4 fxe4 3.Nc3 Nf6 4.Bg5 g6 5.h4 '''A84''' Dutch Defence 2.c4: 2.c4 *Dutch Defense: 1.d4 f5 2.c4 *Dutch Defense: Classical Variation: 1.d4 f5 2.c4 e6 *Dutch Defense: Bellon Gambit: 1.d4 f5 2.c4 e6 3.e4 *Dutch Defense: Rubinstein Variation: 1.d4 f5 2.c4 e6 3.Nc3 *Dutch Defense: Bladel Variation: 1.d4 f5 2.c4 g6 3.Nc3 Nh6 *Dutch Defense: Normal Variation: 1.d4 f5 2.c4 Nf6 *Dutch Defense: Krause Variation: 1.d4 f5 2.c4 Nf6 3.Nc3 d6 4.Nf3 Nc6 '''A85''' Dutch with 2.c4 Nf6 3.Nc3: 2... Nf6 3.Nc3 *Dutch Defense: Queen's Knight Variation: 1.d4 f5 2.c4 Nf6 3.Nc3 '''A86''' Dutch with 2.c4 Nf6 3.g3: 2... Nf6 3.g3 *Dutch Defense: Fianchetto Variation: 1.d4 f5 2.c4 Nf6 3.g3 *Dutch Defense: Hort-Antoshin System: 1.d4 f5 2.c4 Nf6 3.g3 d6 4.Bg2 c6 5.Nc3 Qc7 *Dutch Defense: Leningrad Variation: 1.d4 f5 2.c4 Nf6 3.g3 g6 '''A87''' Dutch, Leningrad, Main Variation: 3...g6 4.Bg2 Bg7 5.Nf3 *Dutch Defense: Leningrad Variation: 1.d4 f5 2.c4 Nf6 3.g3 g6 4.Bg2 Bg7 5.Nf3 '''A88''' Dutch, Leningrad, Main Variation with 5...0-0 6.0-0 d6 7.Nc3 c6: 5...0-0 6.0-0 d6 7.Nc3 c6 *Dutch Defense: Leningrad Variation, Warsaw Variation: 1.d4 f5 2.g3 Nf6 3.Bg2 g6 4.Nf3 Bg7 5.0-0 0-0 6.c4 d6 7.Nc3 c6 '''A89''' Dutch, Leningrad, Main Variation with 5...0-0 6.0-0 d6 7.Nc3 Nc6: 5...0-0 6.0-0 d6 7.Nc3 Nc6 *Dutch Defense: Leningrad Variation, Matulovic Variation: 1.d4 f5 2.g3 Nf6 3.Bg2 g6 4.Nf3 Bg7 5.0-0 0-0 6.c4 d6 7.Nc3 Nc6 '''A90''' Dutch Defence 2.c4 Nf6 3.g3 e6 4.Bg2: 3...e6 4.Bg2 *Dutch Defense: Stonewall Variation, Modern Variation: 1.d4 f5 2.c4 e6 3.Nf3 Nf6 4.g3 c6 5.Bg2 d5 6.0-0 Bd6 *Dutch Defense: Classical Variation: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 *Dutch Defense: Nimzo-Dutch Variation: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Bb4+ *Dutch Defense: Nimzo-Dutch Variation, Alekhine Variation: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Bb4+ 5.Bd2 Be7 *Dutch Defense: Classical Variation: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 d5 5.Nf3 '''A91''' Dutch Defence 2.c4 Nf6 3.g3 e6 4.Bg2 Be7: 4...Be7 *Dutch Defense: Classical Variation: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 *Dutch Defense: Classical Variation, Blackburne Attack: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nh3 '''A92''' Dutch Defence 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0: 5.Nf3 0-0 *Dutch Defense: Classical Variation: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 *Dutch Defense: Stonewall Variation: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d5 *Dutch Defense: Stonewall Variation: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d5 7.Nc3 *Dutch Defense: Alekhine Variation: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 Ne4 '''A93''' Dutch, Stonewall, Botvinnik Variation 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d5 7.b3: 6.0-0 d5 7.b3 *Dutch Defense: Stonewall Variation, Botvinnik Variation: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d5 7.b3 '''A94''' Dutch, Stonewall with 6.0-0 d5.7.b3 c6 8.Ba3: 7... c6 8.Ba3 *Dutch Defense: Stonewall Variation: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d5 7.b3 c6 8.Ba3 '''A95''' Dutch, Stonewall with 6.0-0 d5.7.Nc3 c6: 6.0-0 d5 7.Nc3 c6 *Dutch Defense: Stonewall Variation: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d5 7.Nc3 c6 *Dutch Defense: Stonewall Variation, Chekhover Variation: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d5 7.Nc3 c6 8.Qc2 Qe8 9.Bg5 '''A96''' Dutch, Classical Variation 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d6: 6.0-0 d6 *Dutch Defense: Classical Variation: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d6 *Dutch Defense: Classical Variation, Buenos Aires Variation: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d6 7.Nc3 a5 *Dutch Defense: Classical Variation, Huisl Variation: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d6 7.Nc3 Ne4 '''A97''' Dutch, Ilyin–Genevsky Variation 7.Nc3 Qe8: 7.Nc3 Qe8 *Dutch Defense: Classical Variation, Ilyin-Zhenevsky Variation: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d6 7.Nc3 Qe8 *Dutch Defense: Classical Variation, Ilyin-Zhenevsky Variation, Winter Variation: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d6 7.Nc3 Qe8 8.Re1 '''A98''' Dutch, Ilyin–Genevsky Variation with 7.Nc3 Qe8 8.Qc2: 8.Qc2 *Dutch Defense: Classical Variation, Ilyin-Zhenevsky Variation, Alatortsev-Lisitsyn Line: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d6 7.Nc3 Qe8 8.Qc2 '''A99''' Dutch, Ilyin–Genevsky Variation with 7.Nc3 Qe8 8.b3: 8.b3 *Dutch Defense: Classical Variation, Ilyin-Zhenevsky Variation, Modern Main Line: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d6 7.Nc3 Qe8 8.b3
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