export const chessOpeningTree = { "Nh3": { "_metadata": { "eco": "A00", "name": "Amar Opening" }, "d5": { "g3": { "e5": { "f4": { "_metadata": { "eco": "A00", "name": "Amar Opening: Paris Gambit" }, "Bxh3": { "Bxh3": { "exf4": { "O-O": { "fxg3": { "hxg3": { "_metadata": { "eco": "A00", "name": "Amar Opening: Paris Gambit, Gent Gambit" } } } } } } } } } } } }, "e3": { "e5": { "c4": { "d6": { "Nc3": { "Nc6": { "b3": { "Nf6": { "_metadata": { "eco": "A00", "name": "Amsterdam Attack" } } } } } } }, "Bc4": { "b5": { "Bb3": { "_metadata": { "eco": "A00", "name": "Van't Kruijs Opening: Bouncing Bishop Variation" } } } }, "Nc3": { "Nf6": { "f4": { "exf4": { "Nf3": { "_metadata": { "eco": "A00", "name": "Van't Kruijs Opening: Keoni-Hiva Gambit, Akahi Variation" } } } } }, "Nc6": { "f4": { "exf4": { "Nf3": { "_metadata": { "eco": "A00", "name": "Van't Kruijs Opening: Keoni-Hiva Gambit, Alua Variation" } } } } }, "d5": { "f4": { "exf4": { "Nf3": { "_metadata": { "eco": "A00", "name": "Van't Kruijs Opening: Keoni-Hiva Gambit, Ekolu Variation" } } } } } } }, "_metadata": { "eco": "A00", "name": "Van't Kruijs Opening" } }, "a3": { "_metadata": { "eco": "A00", "name": "Anderssen's Opening" }, "a5": { "b4": { "_metadata": { "eco": "A00", "name": "Anderssen's Opening: Polish Gambit" } } }, "e5": { "b3": { "d5": { "c3": { "Nf6": { "d3": { "Nc6": { "e3": { "Bd6": { "f3": { "O-O": { "g3": { "_metadata": { "eco": "A00", "name": "Formation: Hippopotamus Attack" } } } } } } } } } } } }, "g3": { "d5": { "Bg2": { "Nf6": { "d3": { "Nc6": { "Nd2": { "Bd6": { "e3": { "O-O": { "h3": { "_metadata": { "eco": "A00", "name": "Formation: Shy Attack" } } } } } } } } } } } }, "Nc3": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Battambang Variation" } } } }, "f3": { "_metadata": { "eco": "A00", "name": "Barnes Opening" }, "e5": { "g4": { "Qh4#": { "_metadata": { "eco": "A00", "name": "Barnes Opening: Fool's Mate" } } }, "Kf2": { "_metadata": { "eco": "A00", "name": "Barnes Opening: Hammerschlag" } }, "e4": { "Nf6": { "Bc4": { "_metadata": { "eco": "C20", "name": "Barnes Opening: Walkerling" } } } } }, "d5": { "e4": { "g6": { "d4": { "dxe4": { "c3": { "_metadata": { "eco": "A00", "name": "Barnes Opening: Gedult Gambit" } } } } } } }, "f5": { "e4": { "fxe4": { "Nc3": { "_metadata": { "eco": "A00", "name": "Barnes Opening: Gedult Gambit" } } } } } }, "h3": { "_metadata": { "eco": "A00", "name": "Clemenz Opening" }, "h5": { "g4": { "_metadata": { "eco": "A00", "name": "Clemenz Opening: Spike Lee Gambit" } } }, "d5": { "a3": { "e5": { "_metadata": { "eco": "A00", "name": "Creepy Crawly Formation: Classical Defense" } } } }, "e5": { "a3": { "_metadata": { "eco": "A00", "name": "Global Opening" } } } }, "g4": { "_metadata": { "eco": "A00", "name": "Grob Opening" }, "f5": { "_metadata": { "eco": "A00", "name": "Grob Opening: Alessi Gambit" } }, "g5": { "_metadata": { "eco": "A00", "name": "Grob Opening: Double Grob" }, "f4": { "_metadata": { "eco": "A00", "name": "Grob Opening: Double Grob, Coca-Cola Gambit" } } }, "d5": { "Bg2": { "_metadata": { "eco": "A00", "name": "Grob Opening: Grob Gambit" }, "c6": { "_metadata": { "eco": "A00", "name": "Grob Opening: Grob Gambit Declined" }, "c4": { "dxc4": { "b3": { "_metadata": { "eco": "A00", "name": "Grob Opening: Grob Gambit, Richter-Grob Gambit" } } } }, "g5": { "_metadata": { "eco": "A00", "name": "Grob Opening: Spike Attack" } } }, "h5": { "gxh5": { "_metadata": { "eco": "A00", "name": "Grob Opening: Grob Gambit, Basman Gambit" } } }, "Bxg4": { "c4": { "_metadata": { "eco": "A00", "name": "Grob Opening: Grob Gambit, Fritz Gambit" }, "d4": { "Bxb7": { "Nd7": { "Bxa8": { "Qxa8": { "_metadata": { "eco": "A00", "name": "Grob Opening: Grob Gambit, Fritz Gambit, Romford Countergambit" } } } } }, "_metadata": { "eco": "A00", "name": "Grob Opening: Romford Countergambit" } } } }, "e5": { "d4": { "exd4": { "c3": { "_metadata": { "eco": "A00", "name": "Grob Opening: Grob Gambit, Keres Gambit" } } } } } }, "h3": { "e5": { "Bg2": { "c6": { "_metadata": { "eco": "A00", "name": "Grob Opening: Keene Defense" }, "d4": { "e4": { "c4": { "Bd6": { "Nc3": { "Ne7": { "_metadata": { "eco": "A00", "name": "Grob Opening: Keene Defense, Main Line" } } } } } } } } } } }, "e4": { "dxe4": { "Nc3": { "_metadata": { "eco": "A00", "name": "Grob Opening: Zilbermints Gambit" }, "h5": { "_metadata": { "eco": "A00", "name": "Grob Opening: Zilbermints Gambit, Schiller Defense" } }, "e5": { "d3": { "_metadata": { "eco": "A00", "name": "Grob Opening: Zilbermints Gambit, Zilbermints-Hartlaub Gambit" } } } } } } }, "e5": { "h3": { "Nc6": { "_metadata": { "eco": "A00", "name": "Grob Opening: London Defense" } } }, "Bg2": { "d5": { "c4": { "_metadata": { "eco": "A00", "name": "Grob Opening: Spike, Hurst Attack" } } } } } }, "g3": { "_metadata": { "eco": "A00", "name": "Hungarian Opening" }, "Nc6": { "Nc3": { "d5": { "d4": { "e5": { "dxe5": { "d4": { "Ne4": { "f5": { "_metadata": { "eco": "A00", "name": "Hungarian Opening: Asten Gambit" } } } } } } } } } }, "e5": { "a3": { "d5": { "Nf3": { "e4": { "Nh4": { "Be7": { "d3": { "_metadata": { "eco": "A00", "name": "Hungarian Opening: Burk Gambit" } } } } } } } }, "Nh3": { "d5": { "f4": { "Bxh3": { "Bxh3": { "exf4": { "O-O": { "_metadata": { "eco": "A00", "name": "Hungarian Opening: Paris Gambit" } } } } } } } }, "Nf3": { "_metadata": { "eco": "A00", "name": "Hungarian Opening: Reversed Alekhine" }, "e4": { "Ng1": { "Nf6": { "b4": { "_metadata": { "eco": "A00", "name": "Hungarian Opening: Reversed Brooklyn Defense, Brooklyn Benko Gambit" } } } }, "Nh4": { "_metadata": { "eco": "A00", "name": "Hungarian Opening: Reversed Norwegian Defense" } } } } }, "d5": { "Bg2": { "e5": { "b4": { "_metadata": { "eco": "A00", "name": "Hungarian Opening: B\u00fccker Gambit" } }, "c4": { "dxc4": { "b3": { "_metadata": { "eco": "A00", "name": "Hungarian Opening: Winterberg Gambit" } } } } }, "e6": { "_metadata": { "eco": "A00", "name": "Hungarian Opening: Catalan Formation" } }, "c5": { "_metadata": { "eco": "A00", "name": "Hungarian Opening: Reversed Modern Defense" } }, "c6": { "_metadata": { "eco": "A00", "name": "Hungarian Opening: Slav Formation" } } }, "Nf3": { "g5": { "_metadata": { "eco": "A07", "name": "Hungarian Opening: Wiedenhagen-Beta Gambit" } } } }, "f5": { "_metadata": { "eco": "A00", "name": "Hungarian Opening: Dutch Defense" }, "e4": { "fxe4": { "Qh5+": { "g6": { "_metadata": { "eco": "A00", "name": "Hungarian Opening: Pachman Gambit" } } } } } }, "Nf6": { "_metadata": { "eco": "A00", "name": "Hungarian Opening: Indian Defense" } }, "g5": { "_metadata": { "eco": "A00", "name": "Hungarian Opening: Myers Defense" } }, "c5": { "_metadata": { "eco": "A00", "name": "Hungarian Opening: Sicilian Invitation" } }, "g6": { "_metadata": { "eco": "A00", "name": "Hungarian Opening: Symmetrical Variation" } }, "h5": { "Nf3": { "h4": { "_metadata": { "eco": "A00", "name": "Hungarian Opening: Van Kuijk Gambit" } } }, "_metadata": { "eco": "A00", "name": "Lasker Simul Special" } } }, "h4": { "_metadata": { "eco": "A00", "name": "K\u00e1das Opening" }, "d5": { "Rh3": { "_metadata": { "eco": "A00", "name": "K\u00e1das Opening: Beginner's Trap" } }, "d4": { "c5": { "Nf3": { "cxd4": { "c3": { "_metadata": { "eco": "A00", "name": "K\u00e1das Opening: K\u00e1das Gambit" } } } }, "e4": { "_metadata": { "eco": "A00", "name": "K\u00e1das Opening: Myers Variation" } } } } }, "a5": { "_metadata": { "eco": "A00", "name": "K\u00e1das Opening: Koola-Koola Variation" } }, "c5": { "b4": { "_metadata": { "eco": "A00", "name": "K\u00e1das Opening: K\u00e1das Gambit" } } }, "e5": { "d4": { "exd4": { "c3": { "_metadata": { "eco": "A00", "name": "K\u00e1das Opening: K\u00e1das Gambit" } } } } }, "g5": { "_metadata": { "eco": "A00", "name": "K\u00e1das Opening: Schneider Gambit" } }, "f5": { "e4": { "fxe4": { "d3": { "_metadata": { "eco": "A00", "name": "K\u00e1das Opening: Steinbok Gambit" } } } } } }, "d3": { "_metadata": { "eco": "A00", "name": "Mieses Opening" }, "g6": { "g4": { "_metadata": { "eco": "A00", "name": "Mieses Opening: Myers Spike Attack" } } }, "e5": { "_metadata": { "eco": "A00", "name": "Mieses Opening: Reversed Rat" }, "Nd2": { "_metadata": { "eco": "A00", "name": "Valencia Opening" } } }, "c5": { "Nc3": { "Nc6": { "g3": { "_metadata": { "eco": "A00", "name": "Mieses Opening: Venezolana Variation" } } } } } }, "b4": { "_metadata": { "eco": "A00", "name": "Polish Opening" }, "d5": { "Bb2": { "Bf5": { "_metadata": { "eco": "A00", "name": "Polish Opening: Baltic Defense" } }, "Qd6": { "_metadata": { "eco": "A00", "name": "Polish Opening: German Defense" } }, "c6": { "a4": { "_metadata": { "eco": "A00", "name": "Polish Opening: Myers Variation" } } } }, "Nf3": { "_metadata": { "eco": "A06", "name": "Zukertort Opening: Santasiere's Folly" } } }, "c5": { "_metadata": { "eco": "A00", "name": "Polish Opening: Birmingham Gambit" } }, "e5": { "Bb2": { "f6": { "b5": { "_metadata": { "eco": "A00", "name": "Polish Opening: Bugayev Advance Variation" } }, "e4": { "_metadata": { "eco": "A00", "name": "Polish Opening: Tartakower Gambit" } } }, "d6": { "_metadata": { "eco": "A00", "name": "Polish Opening: Czech Defense" } }, "c5": { "_metadata": { "eco": "A00", "name": "Polish Opening: Wolferts Gambit" } } }, "a3": { "_metadata": { "eco": "A00", "name": "Polish Opening: Bugayev Attack" } } }, "f5": { "_metadata": { "eco": "A00", "name": "Polish Opening: Dutch Defense" } }, "Nc6": { "_metadata": { "eco": "A00", "name": "Polish Opening: Grigorian Variation" } }, "Nh6": { "_metadata": { "eco": "A00", "name": "Polish Opening: Karniewski Variation" } }, "Nf6": { "Bb2": { "g6": { "_metadata": { "eco": "A00", "name": "Polish Opening: King's Indian Variation" }, "e4": { "_metadata": { "eco": "A00", "name": "Polish Opening: King's Indian Variation, Schiffler Attack" } }, "c4": { "Bg7": { "e3": { "d6": { "Nf3": { "O-O": { "d4": { "_metadata": { "eco": "A00", "name": "Polish Opening: King's Indian Variation, Sokolsky Attack" } } } } } } } } } } }, "c6": { "_metadata": { "eco": "A00", "name": "Polish Opening: Outflank Variation" }, "Bb2": { "a5": { "b5": { "cxb5": { "e4": { "_metadata": { "eco": "A00", "name": "Polish Opening: Schuehler Gambit" } } } } } } }, "e6": { "Bb2": { "Nf6": { "b5": { "b6": { "_metadata": { "eco": "A00", "name": "Polish Opening: Queen's Indian Variation" } }, "a6": { "_metadata": { "eco": "A00", "name": "Polish Opening: Queenside Defense" }, "a4": { "axb5": { "axb5": { "Rxa1": { "Bxa1": { "_metadata": { "eco": "A00", "name": "Polish Opening: Rooks Swap Line" } } } } } } }, "d5": { "e3": { "_metadata": { "eco": "A00", "name": "Polish Opening: Schiffler-Sokolsky Variation" } } } } } } }, "b5": { "_metadata": { "eco": "A00", "name": "Polish Opening: Symmetrical Variation" } } }, "c3": { "_metadata": { "eco": "A00", "name": "Saragossa Opening" } }, "Na3": { "_metadata": { "eco": "A00", "name": "Sodium Attack" }, "e5": { "d3": { "Bxa3": { "bxa3": { "d5": { "e3": { "c5": { "Rb1": { "_metadata": { "eco": "A00", "name": "Sodium Attack: Celadon Variation" } } } } } } } }, "Nc4": { "Nc6": { "e4": { "f5": { "_metadata": { "eco": "A00", "name": "Sodium Attack: Durkin Gambit" } } } } } }, "g6": { "g4": { "_metadata": { "eco": "A00", "name": "Sodium Attack: Chenoboskion Variation" } } } }, "Nc3": { "_metadata": { "eco": "A00", "name": "Van Geet Opening" }, "e5": { "Nf3": { "Bc5": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Billockus-Johansen Gambit" } }, "Nc6": { "d4": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Napoleon Attack" } } } }, "b3": { "d5": { "e4": { "dxe4": { "d3": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Gladbacher Gambit" } } } } } }, "e3": { "d5": { "Qh5": { "Be6": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Hulsemann Gambit" } }, "Nf6": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Liebig Gambit" } } } } }, "f4": { "exf4": { "e4": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Nowokunski Gambit" } } } }, "_metadata": { "eco": "A00", "name": "Van Geet Opening: Reversed Nimzowitsch" }, "d4": { "exd4": { "Qxd4": { "Nc6": { "Qa4": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Reversed Scandinavian" } } } } } } }, "d5": { "f4": { "e5": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Damhaug Gambit" } }, "d4": { "Ne4": { "f5": { "Nf2": { "Nf6": { "Nf3": { "c5": { "b4": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Jendrossek Gambit" } } } } } } }, "c5": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Melleby Gambit" } }, "e5": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Pfeiffer Gambit" }, "Nf3": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Pfeiffer Gambit, Sleipnir Countergambit" } } } } }, "g5": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Warsteiner Gambit" } } }, "e4": { "dxe4": { "f3": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Dougherty Gambit" } }, "d3": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Dunst-Perrenet Gambit" } }, "Bc4": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Hector Gambit" } } } }, "e3": { "e5": { "d4": { "Bb4": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Sleipnir Gambit" } } } } }, "d3": { "Nf6": { "g3": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Venezolana Variation" } } } } }, "c5": { "b4": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: D\u00fcsseldorf Gambit" } }, "d4": { "cxd4": { "Qxd4": { "Nc6": { "Qh4": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Novosibirsk Variation" } } } } } }, "Nf3": { "Nc6": { "d4": { "cxd4": { "Nxd4": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Sicilian Two Knights" } } } } } }, "Rb1": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Twyble Attack" } } }, "d6": { "f4": { "e5": { "fxe5": { "Nc6": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Hergert Gambit" } } } } } }, "f5": { "e4": { "fxe4": { "d3": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Kluever Gambit" } } } } }, "b5": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Laroche Gambit" } }, "g6": { "h4": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: Myers Attack" } } }, "Nf6": { "g4": { "_metadata": { "eco": "A00", "name": "Van Geet Opening: T\u00fcbingen Gambit" } } } }, "a4": { "_metadata": { "eco": "A00", "name": "Ware Opening" }, "b6": { "d4": { "d5": { "Nc3": { "Nd7": { "_metadata": { "eco": "A00", "name": "Ware Opening: Cologne Gambit" } } } } } }, "e5": { "h4": { "_metadata": { "eco": "A00", "name": "Ware Opening: Crab Variation" } }, "Ra3": { "_metadata": { "eco": "A00", "name": "Ware Opening: Meadow Hay Trap" } }, "a5": { "d5": { "e3": { "f5": { "a6": { "_metadata": { "eco": "A00", "name": "Ware Opening: Ware Gambit" } } } } } } }, "a5": { "_metadata": { "eco": "A00", "name": "Ware Opening: Symmetric Variation" } }, "b5": { "axb5": { "Bb7": { "_metadata": { "eco": "A00", "name": "Ware Opening: Wing Gambit" } } } } }, "b3": { "_metadata": { "eco": "A01", "name": "Nimzo-Larsen Attack" }, "d5": { "_metadata": { "eco": "A01", "name": "Nimzo-Larsen Attack: Classical Variation" }, "Ba3": { "_metadata": { "eco": "A01", "name": "Nimzo-Larsen Attack: Graz Attack" } } }, "f5": { "_metadata": { "eco": "A01", "name": "Nimzo-Larsen Attack: Dutch Variation" }, "Bb2": { "e6": { "e4": { "_metadata": { "eco": "A01", "name": "Nimzo-Larsen Attack: Ringelbach Gambit" } } } } }, "c5": { "_metadata": { "eco": "A01", "name": "Nimzo-Larsen Attack: English Variation" } }, "Nf6": { "_metadata": { "eco": "A01", "name": "Nimzo-Larsen Attack: Indian Variation" }, "Bb2": { "g6": { "g4": { "_metadata": { "eco": "A01", "name": "Nimzo-Larsen Attack: Spike Variation" } } } } }, "e5": { "_metadata": { "eco": "A01", "name": "Nimzo-Larsen Attack: Modern Variation" }, "Bb2": { "Nc6": { "_metadata": { "eco": "A01", "name": "Nimzo-Larsen Attack: Modern Variation" }, "e3": { "_metadata": { "eco": "A01", "name": "Nimzo-Larsen Attack: Modern Variation" } }, "c4": { "Nf6": { "_metadata": { "eco": "A01", "name": "Nimzo-Larsen Attack: Modern Variation" } } }, "f4": { "_metadata": { "eco": "A01", "name": "Nimzo-Larsen Attack: Pachman Gambit" } } } } }, "b5": { "_metadata": { "eco": "A01", "name": "Nimzo-Larsen Attack: Polish Variation" } }, "b6": { "_metadata": { "eco": "A01", "name": "Nimzo-Larsen Attack: Symmetrical Variation" } } }, "f4": { "_metadata": { "eco": "A02", "name": "Bird Opening" }, "Nf6": { "Nf3": { "g6": { "b4": { "_metadata": { "eco": "A02", "name": "Bird Opening: Batavo-Polish Attack" } } } }, "c4": { "_metadata": { "eco": "A02", "name": "Bird Opening: Mujannah" } } }, "f5": { "d4": { "d5": { "_metadata": { "eco": "A02", "name": "Bird Opening: Double Duck Formation" } } }, "e4": { "fxe4": { "Nc3": { "Nf6": { "g4": { "_metadata": { "eco": "A02", "name": "Bird Opening: Swiss Gambit" } } } } }, "_metadata": { "eco": "A02", "name": "Bird Opening: Wagner-Zwitersch Gambit" } } }, "e5": { "_metadata": { "eco": "A02", "name": "Bird Opening: From's Gambit" }, "Nc3": { "_metadata": { "eco": "A02", "name": "Bird Opening: From's Gambit, Bahr Gambit" } }, "fxe5": { "d6": { "exd6": { "Nf6": { "_metadata": { "eco": "A02", "name": "Bird Opening: From's Gambit, Langheld Gambit" } }, "Bxd6": { "Nf3": { "g5": { "_metadata": { "eco": "A02", "name": "Bird Opening: From's Gambit, Lasker Variation" } }, "Nh6": { "d4": { "_metadata": { "eco": "A02", "name": "Bird Opening: From's Gambit, Lipke Variation" } } } } } } }, "f6": { "_metadata": { "eco": "A02", "name": "Bird Opening: Lasker Gambit" } }, "Ne7": { "_metadata": { "eco": "A02", "name": "Bird Opening: Platz Gambit" } }, "Nc6": { "_metadata": { "eco": "A02", "name": "Bird Opening: Schlechter Gambit" } } }, "d4": { "exd4": { "Nf3": { "c5": { "c3": { "_metadata": { "eco": "A02", "name": "Bird Opening: Siegener Gambit" } } } } } } }, "g5": { "_metadata": { "eco": "A02", "name": "Bird Opening: Hobbs Gambit" } }, "h6": { "Nf3": { "g5": { "_metadata": { "eco": "A02", "name": "Bird Opening: Hobbs-Zilbermints Gambit" } } } }, "Nh6": { "_metadata": { "eco": "A02", "name": "Bird Opening: Horsefly Defense" } }, "b5": { "_metadata": { "eco": "A02", "name": "Bird Opening: Myers Defense" } }, "d5": { "_metadata": { "eco": "A03", "name": "Bird Opening: Dutch Variation" }, "g4": { "_metadata": { "eco": "A03", "name": "Bird Opening: Dutch Variation, Dudweiler Gambit" } }, "Nf3": { "Nf6": { "e3": { "c5": { "_metadata": { "eco": "A03", "name": "Bird Opening: Lasker Variation" } } } } }, "c4": { "_metadata": { "eco": "A03", "name": "Bird Opening: Sturm Gambit" } }, "b3": { "Nf6": { "Bb2": { "d4": { "Nf3": { "c5": { "e3": { "_metadata": { "eco": "A03", "name": "Bird Opening: Thomas Gambit" } } } } } } } }, "e4": { "_metadata": { "eco": "A03", "name": "Bird Opening: Williams Gambit" }, "dxe4": { "Nc3": { "Nf6": { "Qe2": { "_metadata": { "eco": "A03", "name": "Bird Opening: Williams Gambit" } }, "Nge2": { "_metadata": { "eco": "A03", "name": "Bird Opening: Williams-Zilbermints Gambit" } } } } } } } }, "Nf3": { "c5": { "e3": { "g6": { "d4": { "Bg7": { "dxc5": { "Qa5+": { "_metadata": { "eco": "A04", "name": "Colle System: Rhamphorhynchus Variation" } } } } } } }, "c4": { "g6": { "d4": { "Bg7": { "e4": { "Qb6": { "_metadata": { "eco": "A04", "name": "Modern Defense: Semi-Averbakh Variation, Polish Variation" } }, "Qa5+": { "_metadata": { "eco": "A04", "name": "Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation" }, "Nc3": { "d6": { "_metadata": { "eco": "A42", "name": "Pterodactyl Defense" } } } } } } } } }, "_metadata": { "eco": "A04", "name": "Zukertort Opening: Sicilian Invitation" }, "d4": { "cxd4": { "e3": { "_metadata": { "eco": "A04", "name": "Zukertort Opening: Speelsmet Gambit" } } } } }, "g6": { "d4": { "Bg7": { "e4": { "d6": { "c4": { "c5": { "dxc5": { "Qa5+": { "_metadata": { "eco": "A04", "name": "Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation Accepted" } } } } } } } } }, "_metadata": { "eco": "A04", "name": "Zukertort Opening: Kingside Fianchetto" } }, "Nh6": { "d4": { "g6": { "_metadata": { "eco": "A04", "name": "Zukertort Defense: Kingside Variation" } } } }, "Na6": { "e4": { "c5": { "_metadata": { "eco": "A04", "name": "Zukertort Defense: Sicilian Knight Variation" } }, "Nh6": { "_metadata": { "eco": "A04", "name": "Zukertort Opening: Drunken Cavalry Variation" } } } }, "_metadata": { "eco": "A04", "name": "Zukertort Opening" }, "f6": { "_metadata": { "eco": "A04", "name": "Zukertort Opening: Arctic Defense" }, "e4": { "Nh6": { "d4": { "Nf7": { "_metadata": { "eco": "A04", "name": "Zukertort Opening: Arctic Defense, Drunken Knight Variation" } } } } } }, "h6": { "_metadata": { "eco": "A04", "name": "Zukertort Opening: Basman Defense" } }, "Nc6": { "_metadata": { "eco": "A04", "name": "Zukertort Opening: Black Mustang Defense" } }, "f5": { "_metadata": { "eco": "A04", "name": "Zukertort Opening: Dutch Variation" }, "e4": { "_metadata": { "eco": "A04", "name": "Zukertort Opening: Lisitsyn Gambit" } }, "d3": { "Nf6": { "e4": { "_metadata": { "eco": "A04", "name": "Zukertort Opening: Lisitsyn Gambit Deferred" } } } } }, "g5": { "_metadata": { "eco": "A04", "name": "Zukertort Opening: Herrstrom Gambit" } }, "d6": { "_metadata": { "eco": "A04", "name": "Zukertort Opening: Pirc Invitation" }, "d4": { "e5": { "_metadata": { "eco": "A04", "name": "Zukertort Opening: Vos Gambit" } } }, "e4": { "Bg4": { "_metadata": { "eco": "A04", "name": "Zukertort Opening: Wade Defense" } } } }, "b5": { "_metadata": { "eco": "A04", "name": "Zukertort Opening: Polish Defense" } }, "e6": { "_metadata": { "eco": "A04", "name": "Zukertort Opening: Queen's Gambit Invitation" }, "c4": { "a6": { "Nc3": { "c5": { "g3": { "b5": { "_metadata": { "eco": "A04", "name": "Zukertort Opening: Shabalov Gambit" } } } } } } } }, "b6": { "_metadata": { "eco": "A04", "name": "Zukertort Opening: Queenside Fianchetto Variation" } }, "e5": { "_metadata": { "eco": "A04", "name": "Zukertort Opening: Ross Gambit" }, "Nxe5": { "Nc6": { "Nxc6": { "dxc6": { "_metadata": { "eco": "A04", "name": "Zukertort Opening: The Walrus" } } } } } }, "c6": { "_metadata": { "eco": "A04", "name": "Zukertort Opening: Slav Invitation" } }, "a6": { "_metadata": { "eco": "A04", "name": "Zukertort Opening: St. George Defense" } }, "a5": { "_metadata": { "eco": "A04", "name": "Zukertort Opening: Ware Defense" } }, "Nf6": { "g3": { "d5": { "_metadata": { "eco": "A05", "name": "King's Indian Attack" }, "Bg2": { "c6": { "O-O": { "Bg4": { "_metadata": { "eco": "A07", "name": "King's Indian Attack: Yugoslav Variation" } } } } } }, "g6": { "b4": { "_metadata": { "eco": "A05", "name": "King's Indian Attack: Smyslov Variation" } }, "_metadata": { "eco": "A05", "name": "King's Indian Attack: Symmetrical Defense" }, "Bg2": { "Bg7": { "O-O": { "O-O": { "d3": { "d5": { "_metadata": { "eco": "A05", "name": "King's Indian Attack: Wahls Defense" } } } } } } }, "b3": { "Bg7": { "Bb2": { "O-O": { "Bg2": { "d6": { "O-O": { "_metadata": { "eco": "A05", "name": "Zukertort Opening: Double Fianchetto Attack" } } } } } } } } }, "b5": { "_metadata": { "eco": "A05", "name": "King's Indian Attack: Spassky Variation" } } }, "b4": { "_metadata": { "eco": "A05", "name": "Polish Opening: Zukertort System" } }, "_metadata": { "eco": "A05", "name": "Zukertort Opening" }, "Nc3": { "Nc6": { "_metadata": { "eco": "A05", "name": "Zukertort Opening" } } }, "e4": { "_metadata": { "eco": "A05", "name": "Zukertort Opening: Lemberger Gambit" } }, "a4": { "g6": { "b4": { "_metadata": { "eco": "A05", "name": "Zukertort Opening: Myers Polish Attack" } } } }, "b3": { "_metadata": { "eco": "A05", "name": "Zukertort Opening: Nimzo-Larsen Variation" } }, "e3": { "_metadata": { "eco": "A05", "name": "Zukertort Opening: Quiet System" } }, "c4": { "c6": { "b3": { "d5": { "Bb2": { "_metadata": { "eco": "A12", "name": "R\u00fcti Opening: Anglo-Slav Variation, Bogoljubow Variation" }, "Bf5": { "_metadata": { "eco": "A12", "name": "R\u00fcti Opening: Anglo-Slav Variation, New York System" } } } } } } } }, "d5": { "b3": { "_metadata": { "eco": "A06", "name": "Nimzo-Larsen Attack: Classical Variation" }, "c5": { "e4": { "_metadata": { "eco": "A06", "name": "Nimzo-Larsen Attack: Norfolk Gambit" } }, "c4": { "dxc4": { "Nc3": { "_metadata": { "eco": "A06", "name": "Zukertort Opening: Regina-Nu Gambit" } } } } }, "Nf6": { "Bb2": { "c5": { "e4": { "_metadata": { "eco": "A06", "name": "Nimzo-Larsen Attack: Norfolk Gambit" } } }, "g6": { "c4": { "c6": { "_metadata": { "eco": "A12", "name": "R\u00fcti Opening: Anglo-Slav Variation, Bled Variation" } } } } } } }, "_metadata": { "eco": "A06", "name": "Zukertort Opening" }, "Rg1": { "_metadata": { "eco": "A06", "name": "Zukertort Opening: Ampel Variation" } }, "d3": { "_metadata": { "eco": "A06", "name": "Zukertort Opening: Old Indian Attack" } }, "e3": { "c5": { "c4": { "dxc4": { "b3": { "_metadata": { "eco": "A06", "name": "Zukertort Opening: Pachman Gambit" } } } } } }, "Nc3": { "_metadata": { "eco": "A06", "name": "Zukertort Opening: Reversed Mexican Defense" } }, "a4": { "_metadata": { "eco": "A06", "name": "Zukertort Opening: The Potato" } }, "g3": { "_metadata": { "eco": "A07", "name": "King's Indian Attack" }, "g6": { "_metadata": { "eco": "A07", "name": "King's Indian Attack: Double Fianchetto" }, "Bg2": { "Bg7": { "O-O": { "e5": { "d3": { "Ne7": { "_metadata": { "eco": "A07", "name": "King's Indian Attack: Pachman System" } } } } } } } }, "Bg4": { "_metadata": { "eco": "A07", "name": "King's Indian Attack: Keres Variation" }, "Bg2": { "Nd7": { "_metadata": { "eco": "A07", "name": "King's Indian Attack: Keres Variation" } } } }, "e5": { "_metadata": { "eco": "A07", "name": "King's Indian Attack: Omega-Delta Gambit" } }, "c5": { "_metadata": { "eco": "A07", "name": "King's Indian Attack: Sicilian Variation" }, "Bg2": { "Nc6": { "_metadata": { "eco": "A08", "name": "King's Indian Attack: French Variation" }, "d4": { "_metadata": { "eco": "A08", "name": "Zukertort Opening: Reversed Gr\u00fcnfeld" }, "Nf6": { "_metadata": { "eco": "A08", "name": "Zukertort Opening: Reversed Gr\u00fcnfeld" }, "O-O": { "_metadata": { "eco": "A08", "name": "Zukertort Opening: Reversed Gr\u00fcnfeld" } } }, "e6": { "O-O": { "_metadata": { "eco": "A08", "name": "Zukertort Opening: Reversed Gr\u00fcnfeld" } } } } }, "_metadata": { "eco": "A08", "name": "King's Indian Attack: Sicilian Variation" }, "Nf6": { "O-O": { "e6": { "d3": { "_metadata": { "eco": "A08", "name": "King's Indian Attack: Sicilian Variation" } } } } } } } }, "c4": { "_metadata": { "eco": "A09", "name": "R\u00fcti Opening" }, "d4": { "_metadata": { "eco": "A09", "name": "R\u00fcti Opening: Advance Variation" }, "b4": { "c5": { "_metadata": { "eco": "A09", "name": "R\u00fcti Opening: Advance Variation, Michel Gambit" } } }, "Rg1": { "_metadata": { "eco": "A09", "name": "R\u00fcti Opening: Penguin Variation" } }, "e3": { "c5": { "b4": { "_metadata": { "eco": "A09", "name": "R\u00fcti Opening: Reversed Blumenfeld Gambit" } } } } }, "dxc4": { "_metadata": { "eco": "A09", "name": "R\u00fcti Opening: R\u00fcti Accepted" }, "e3": { "Be6": { "_metadata": { "eco": "A09", "name": "R\u00fcti Opening: R\u00fcti Gambit, Keres Variation" } } } }, "b5": { "_metadata": { "eco": "A09", "name": "R\u00fcti Opening: Zilbermints Gambit" } }, "c6": { "b3": { "_metadata": { "eco": "A12", "name": "R\u00fcti Opening: Anglo-Slav Variation, Bogoljubow Variation" }, "Bg4": { "_metadata": { "eco": "A12", "name": "R\u00fcti Opening: Anglo-Slav Variation, Bogoljubow Variation" } } } }, "e6": { "g3": { "Nf6": { "Bg2": { "Be7": { "O-O": { "O-O": { "b3": { "c6": { "Bb2": { "_metadata": { "eco": "A14", "name": "R\u00fcti Opening: Anglo-Slav Variation, Bogoljubow Variation, Stonewall Line" } } } } } } } } } } } }, "d4": { "Bg4": { "_metadata": { "eco": "D02", "name": "Queen's Pawn Game: Anti-Torre" } }, "Nf6": { "c4": { "e6": { "Nc3": { "Be7": { "Bg5": { "O-O": { "e3": { "Nbd7": { "Rc1": { "b6": { "cxd5": { "exd5": { "Bb5": { "_metadata": { "eco": "D63", "name": "Queen's Gambit Declined: Orthodox Defense, Capablanca Variation" } } } } }, "c6": { "Qc2": { "Ne4": { "_metadata": { "eco": "D64", "name": "Queen's Gambit Declined: Orthodox Defense, Rubinstein Attack" } } } } } } } } } } } } } } } } }, "e4": { "d5": { "Nf3": { "_metadata": { "eco": "A06", "name": "Zukertort Opening: Tennison Gambit" }, "dxe4": { "Ng5": { "Nf6": { "Nc3": { "Bf5": { "Qe2": { "Qd4": { "_metadata": { "eco": "A06", "name": "Zukertort Opening: Tennison Gambit, Brigg's Trap" } } } } } } } } }, "_metadata": { "eco": "B01", "name": "Scandinavian Defense" }, "b3": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense" } }, "exd5": { "Qxd5": { "Nc3": { "Qa5": { "d4": { "e5": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Anderssen Counterattack" }, "Nf3": { "Bg4": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Anderssen Counterattack, Collijn Variation" } }, "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Anderssen Counterattack, Goteborg System" } }, "dxe5": { "Nc6": { "Nf3": { "Bb4": { "Bd2": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Anderssen Counterattack, Orthodox Attack" } } } } } } }, "Nf6": { "Nf3": { "Bf5": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Classical Variation" }, "Ne5": { "c6": { "g4": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Gr\u00fcnfeld Variation" } } } } }, "Bg4": { "h3": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Lasker Variation" } } } }, "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Main Line, Mieses Variation" } } }, "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Main Line" }, "b4": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Main Line, Leonhardt Gambit" } } }, "Qd6": { "d4": { "Nf6": { "Nf3": { "a6": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Bronstein Variation" } } }, "Bc4": { "c6": { "Nge2": { "Bf5": { "Bf4": { "Qb4": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Schiller-Pytel Variation, Modern Variation" } } } } } } } }, "c6": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Schiller-Pytel Variation" } } }, "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Gubinsky-Melts Defense" } }, "Qd8": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Valencian Variation" }, "d4": { "Nf6": { "Nf3": { "c6": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Valencian Variation, Ilundain Variation" } }, "Bg4": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Valencian Variation, Main Line" } } } } } } }, "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Mieses-Kotroc Variation" } }, "c6": { "dxc6": { "Nxc6": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Blackburne Gambit" } }, "e5": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Kloosterboer Gambit" } } }, "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Blackburne-Kloosterboer Gambit" } }, "e5": { "dxe6": { "Bxe6": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Boehnke Gambit" } } } }, "Nf6": { "c4": { "e6": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Icelandic-Palme Gambit" } }, "c6": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Panov Transfer" } } }, "d4": { "Nxd5": { "c4": { "Nb4": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Kiel Variation" } } }, "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Marshall Variation" }, "Nf3": { "Bg4": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Modern Variation, Gipslis Variation" } }, "g6": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Richter Variation" } } } }, "c6": { "dxc6": { "e5": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: K\u00e1das Gambit" } } } }, "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Modern Variation" }, "g6": { "c4": { "b5": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Modern Variation, Wing Gambit" } } }, "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Richter Variation" } }, "Bg4": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Portuguese Gambit" }, "f3": { "Bf5": { "c4": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Portuguese Gambit, Banker Variation" } }, "g4": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Portuguese Gambit, Correspondence Refutation" } }, "Bb5+": { "Nbd7": { "c4": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Portuguese Gambit, Jadoul Variation" } }, "Nc3": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Portuguese Gambit, Melbourne Shuffle Variation" } } } } } }, "Nf3": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Portuguese Gambit, Classical Variation" } }, "Bb5+": { "c6": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Portuguese Gambit, Elbow Variation" } }, "Nbd7": { "Be2": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Portuguese Gambit, Lusophobe Variation" } } } }, "Be2": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Portuguese Gambit, Wuss Variation" } } } }, "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Modern Variation" } } }, "b4": { "_metadata": { "eco": "B01", "name": "Scandinavian Defense: Zilbermints Gambit" } }, "Nc3": { "dxe4": { "Nxe4": { "e5": { "_metadata": { "eco": "B01", "name": "Van Geet Opening: Gr\u00fcnfeld Defense" } } } } } }, "e6": { "d3": { "d5": { "Nd2": { "Nf6": { "Ngf3": { "c5": { "g3": { "Nc6": { "Bg2": { "Be7": { "O-O": { "O-O": { "Re1": { "_metadata": { "eco": "A08", "name": "King's Indian Attack: Sicilian Variation" } } } } } } } } }, "Nc6": { "Be2": { "_metadata": { "eco": "C00", "name": "French Defense: Reversed Philidor Formation" } } } } } } }, "_metadata": { "eco": "C00", "name": "French Defense: King's Indian Attack" }, "f5": { "_metadata": { "eco": "C00", "name": "French Defense: King's Indian Attack, Franco-Hiva Gambit" } } }, "d4": { "c5": { "d5": { "_metadata": { "eco": "A43", "name": "Benoni Defense: French Benoni" } }, "_metadata": { "eco": "C00", "name": "French Defense: Franco-Sicilian Defense" } }, "d5": { "_metadata": { "eco": "C00", "name": "French Defense" }, "Be3": { "_metadata": { "eco": "C00", "name": "French Defense: Alapin Gambit" } }, "Nf3": { "dxe4": { "Ne5": { "_metadata": { "eco": "C00", "name": "French Defense: Carlson Gambit" } } }, "_metadata": { "eco": "C00", "name": "French Defense: Perseus Gambit" } }, "c4": { "_metadata": { "eco": "C00", "name": "French Defense: Diemer-Duhm Gambit" }, "dxe4": { "_metadata": { "eco": "C00", "name": "French Defense: Diemer-Duhm Gambit Accepted" } } }, "Qe2": { "e5": { "f4": { "exf4": { "_metadata": { "eco": "C00", "name": "French Defense: Hoffmann Gambit" } } } } }, "Nh3": { "_metadata": { "eco": "C00", "name": "French Defense: Morphy Gambit" } }, "Bd3": { "_metadata": { "eco": "C00", "name": "French Defense: Schlechter Variation" } }, "exd5": { "_metadata": { "eco": "C01", "name": "French Defense: Exchange Variation" }, "exd5": { "Nf3": { "_metadata": { "eco": "C01", "name": "French Defense: Exchange Variation" } }, "Nc3": { "_metadata": { "eco": "C01", "name": "French Defense: Exchange Variation" }, "Nf6": { "Bg5": { "Nc6": { "_metadata": { "eco": "C01", "name": "French Defense: Exchange Variation, Bogoljubow Variation" } } } } }, "c4": { "_metadata": { "eco": "C01", "name": "French Defense: Exchange Variation, Monte Carlo Variation" } } } }, "Nc3": { "Nf6": { "exd5": { "exd5": { "Bg5": { "_metadata": { "eco": "C01", "name": "French Defense: Exchange Variation, Svenonius Variation" } } }, "_metadata": { "eco": "C11", "name": "French Defense: Classical Variation, Delayed Exchange Variation" } }, "Bg5": { "_metadata": { "eco": "C11", "name": "French Defense: Burn Variation" }, "dxe4": { "Nxe4": { "Be7": { "Bxf6": { "Bxf6": { "Nf3": { "O-O": { "_metadata": { "eco": "C11", "name": "French Defense: Classical Variation, Burn Variation, Main Line" } } } }, "gxf6": { "_metadata": { "eco": "C11", "name": "French Defense: Classical Variation, Burn Variation, Morozevich Line" } } } } } }, "Bb4": { "_metadata": { "eco": "C12", "name": "French Defense: MacCutcheon Variation" }, "e5": { "_metadata": { "eco": "C12", "name": "French Defense: MacCutcheon Variation, Advance Variation" }, "h6": { "Bh4": { "_metadata": { "eco": "C12", "name": "French Defense: MacCutcheon Variation, Bernstein Variation" } }, "exf6": { "_metadata": { "eco": "C12", "name": "French Defense: MacCutcheon Variation, Chigorin Variation" }, "hxg5": { "fxg7": { "Rg8": { "h4": { "gxh4": { "Qg4": { "_metadata": { "eco": "C12", "name": "French Defense: MacCutcheon Variation, Grigoriev Variation" } } } } } } } }, "Bc1": { "_metadata": { "eco": "C12", "name": "French Defense: MacCutcheon Variation, Dr. Olland Variation" } }, "Be3": { "_metadata": { "eco": "C12", "name": "French Defense: MacCutcheon Variation, Janowski Variation" } }, "Bd2": { "Bxc3": { "_metadata": { "eco": "C12", "name": "French Defense: MacCutcheon Variation, Lasker Variation" }, "bxc3": { "Ne4": { "Qg4": { "g6": { "_metadata": { "eco": "C12", "name": "French Defense: MacCutcheon Variation, Lasker Variation" } } } } } }, "Nfd7": { "_metadata": { "eco": "C12", "name": "French Defense: MacCutcheon Variation, Tartakower Variation" } } } } }, "exd5": { "Qxd5": { "Bxf6": { "gxf6": { "Qd2": { "Qa5": { "_metadata": { "eco": "C12", "name": "French Defense: MacCutcheon Variation, Bogoljubow Variation" } } } } } }, "_metadata": { "eco": "C12", "name": "French Defense: MacCutcheon Variation, Exchange Variation" } } }, "Be7": { "e5": { "Nfd7": { "h4": { "_metadata": { "eco": "C13", "name": "French Defense: Alekhine-Chatard Attack" }, "Bxg5": { "hxg5": { "Qxg5": { "_metadata": { "eco": "C13", "name": "French Defense: Alekhine-Chatard Attack, Albin-Chatard Gambit" } } } }, "c5": { "_metadata": { "eco": "C13", "name": "French Defense: Alekhine-Chatard Attack, Breyer Variation" } }, "a6": { "_metadata": { "eco": "C13", "name": "French Defense: Alekhine-Chatard Attack, Mar\u00f3czy Variation" } }, "O-O": { "_metadata": { "eco": "C13", "name": "French Defense: Alekhine-Chatard Attack, Spielmann Variation" } }, "f6": { "_metadata": { "eco": "C13", "name": "French Defense: Alekhine-Chatard Attack, Teichmann Variation" } } }, "Bxe7": { "Qxe7": { "_metadata": { "eco": "C14", "name": "French Defense: Classical Variation" }, "Nb5": { "_metadata": { "eco": "C14", "name": "French Defense: Classical Variation, Alapin Variation" } }, "Qg4": { "_metadata": { "eco": "C14", "name": "French Defense: Classical Variation, Pollock Variation" } }, "Qd2": { "_metadata": { "eco": "C14", "name": "French Defense: Classical Variation, Rubinstein Variation" } }, "f4": { "O-O": { "Nf3": { "c5": { "Qd2": { "Nc6": { "O-O-O": { "c4": { "_metadata": { "eco": "C14", "name": "French Defense: Classical Variation, Stahlberg Variation" } } } } } } } }, "_metadata": { "eco": "C14", "name": "French Defense: Classical Variation, Steinitz Variation" } }, "Bd3": { "_metadata": { "eco": "C14", "name": "French Defense: Classical Variation, Tarrasch Variation" } } } } }, "Ng8": { "Be3": { "b6": { "_metadata": { "eco": "C13", "name": "French Defense: Classical Variation, Frankfurt Variation" } } }, "_metadata": { "eco": "C13", "name": "French Defense: Classical Variation, Vistaneckis Variation" } }, "Ne4": { "_metadata": { "eco": "C13", "name": "French Defense: Classical Variation, Tartakower Variation" } } }, "_metadata": { "eco": "C13", "name": "French Defense: Classical Variation, Normal Variation" }, "Bxf6": { "_metadata": { "eco": "C13", "name": "French Defense: Classical Variation, Richter Attack" }, "Bxf6": { "e5": { "Be7": { "Qg4": { "_metadata": { "eco": "C13", "name": "French Defense: Classical Variation, Richter Attack" } } } } } } } }, "_metadata": { "eco": "C11", "name": "French Defense: Classical Variation" }, "e5": { "_metadata": { "eco": "C11", "name": "French Defense: Classical Variation, Steinitz Variation" }, "Nfd7": { "f4": { "c5": { "dxc5": { "Nc6": { "_metadata": { "eco": "C11", "name": "French Defense: Steinitz Variation" }, "a3": { "Bxc5": { "Qg4": { "O-O": { "Nf3": { "f6": { "_metadata": { "eco": "C11", "name": "French Defense: Steinitz Variation, Brodsky-Jones Variation" } } } } } } } }, "Bxc5": { "Qg4": { "_metadata": { "eco": "C11", "name": "French Defense: Steinitz Variation, Bradford Attack Variation" } } } }, "Nf3": { "_metadata": { "eco": "C11", "name": "French Defense: Steinitz Variation" }, "Nc6": { "Be3": { "_metadata": { "eco": "C11", "name": "French Defense: Steinitz Variation, Boleslavsky Variation" } } } } } }, "Qg4": { "_metadata": { "eco": "C11", "name": "French Defense: Steinitz Variation, Gledhill Attack" } } } }, "Bd3": { "_metadata": { "eco": "C11", "name": "French Defense: Classical Variation, Swiss Variation" } }, "Be3": { "_metadata": { "eco": "C11", "name": "French Defense: Henneberger Variation" } } }, "Nc6": { "exd5": { "_metadata": { "eco": "C10", "name": "French Defense: Classical Variation, Svenonius Variation" } } }, "c5": { "_metadata": { "eco": "C10", "name": "French Defense: Marshall Gambit" } }, "_metadata": { "eco": "C10", "name": "French Defense: Paulsen Variation" }, "dxe4": { "_metadata": { "eco": "C10", "name": "French Defense: Rubinstein Variation" }, "Nxe4": { "Nd7": { "_metadata": { "eco": "C10", "name": "French Defense: Rubinstein Variation, Blackburne Defense" }, "Nf3": { "Ngf6": { "Nxf6+": { "Nxf6": { "Ne5": { "_metadata": { "eco": "C10", "name": "French Defense: Rubinstein Variation, Capablanca Line" } } } } } } }, "e5": { "_metadata": { "eco": "C10", "name": "French Defense: Rubinstein Variation, Ellis Gambit" } }, "Bd7": { "Nf3": { "Bc6": { "_metadata": { "eco": "C10", "name": "French Defense: Rubinstein Variation, Fort Knox Variation" } } } }, "Qd5": { "_metadata": { "eco": "C10", "name": "French Defense: Rubinstein Variation, Maric Variation" } } } }, "a6": { "Nf3": { "Nf6": { "e5": { "Nfd7": { "_metadata": { "eco": "C11", "name": "French Defense: Steinitz Variation" }, "a3": { "_metadata": { "eco": "C11", "name": "French Defense: Steinitz Variation" } }, "Ne2": { "_metadata": { "eco": "C11", "name": "French Defense: Steinitz Variation" } }, "Bg5": { "_metadata": { "eco": "C14", "name": "French Defense: Classical Variation" } } } } } } }, "Bb4": { "Ne2": { "Nf6": { "Bg5": { "_metadata": { "eco": "C15", "name": "French Defense: MacCutcheon Variation, Wolf Gambit" } } }, "dxe4": { "a3": { "Bxc3+": { "_metadata": { "eco": "C15", "name": "French Defense: Winawer Variation, Alekhine Gambit Accepted" }, "Nxc3": { "Nc6": { "_metadata": { "eco": "C15", "name": "French Defense: Winawer Variation, Alekhine Gambit, Kan Variation" } } } }, "Be7": { "Nxe4": { "Nf6": { "N2g3": { "O-O": { "Be2": { "Nc6": { "_metadata": { "eco": "C15", "name": "French Defense: Winawer Variation, Alekhine Gambit, Alatortsev Variation" } } } } } } } } } }, "_metadata": { "eco": "C15", "name": "French Defense: Winawer Variation, Alekhine-Mar\u00f3czy Gambit" } }, "_metadata": { "eco": "C15", "name": "French Defense: Winawer Variation" }, "exd5": { "_metadata": { "eco": "C15", "name": "French Defense: Winawer Variation, Delayed Exchange Variation" }, "exd5": { "Bd3": { "Ne7": { "Qh5": { "_metadata": { "eco": "C15", "name": "French Defense: Winawer Variation, Exchange Variation, Canal Attack" } } } } } }, "Bd2": { "_metadata": { "eco": "C15", "name": "French Defense: Winawer Variation, Fingerslip Variation" }, "dxe4": { "Qg4": { "Qxd4": { "_metadata": { "eco": "C15", "name": "French Defense: Winawer Variation, Fingerslip Variation, Kunin Double Gambit" } }, "Nf6": { "Qxg7": { "Rg8": { "Qh6": { "_metadata": { "eco": "C15", "name": "French Defense: Winawer Variation, Fingerslip Variation, Main Line" } } } } } } }, "Ne7": { "Nb1": { "_metadata": { "eco": "C15", "name": "French Defense: Winawer Variation, Fingerslip Variation, Schwarz's Line" } } } }, "Bd3": { "c5": { "exd5": { "Qxd5": { "Bd2": { "_metadata": { "eco": "C15", "name": "French Defense: Winawer Variation, Kondratiyev Variation" } } } } } }, "a3": { "Bxc3+": { "bxc3": { "dxe4": { "f3": { "_metadata": { "eco": "C15", "name": "French Defense: Winawer Variation, Winckelmann-Reimer Gambit" } } } } } }, "e5": { "_metadata": { "eco": "C16", "name": "French Defense: Winawer Variation, Advance Variation" }, "Qd7": { "_metadata": { "eco": "C16", "name": "French Defense: Winawer Variation, Petrosian Variation" } }, "c5": { "_metadata": { "eco": "C17", "name": "French Defense: Winawer Variation, Advance Variation" }, "a3": { "_metadata": { "eco": "C17", "name": "French Defense: Winawer Variation, Advance Variation" }, "cxd4": { "axb4": { "dxc3": { "Nf3": { "_metadata": { "eco": "C17", "name": "French Defense: Winawer Variation, Advance Variation" } }, "_metadata": { "eco": "C17", "name": "French Defense: Winawer Variation, Mar\u00f3czy-Wallis Variation" } } } }, "Ba5": { "_metadata": { "eco": "C17", "name": "French Defense: Winawer Variation, Retreat Variation" }, "b4": { "cxd4": { "_metadata": { "eco": "C17", "name": "French Defense: Winawer Variation, Retreat Variation, Armenian Line" } } } }, "Bxc3+": { "bxc3": { "_metadata": { "eco": "C18", "name": "French Defense: Winawer Variation, Advance Variation" }, "Qc7": { "_metadata": { "eco": "C18", "name": "French Defense: Winawer Variation, Classical Variation" } }, "Qa5": { "_metadata": { "eco": "C18", "name": "French Defense: Winawer Variation, Portisch-Hook Variation" } }, "Ne7": { "_metadata": { "eco": "C19", "name": "French Defense: Winawer Variation, Advance Variation" }, "a4": { "_metadata": { "eco": "C19", "name": "French Defense: Winawer Variation, Advance Variation" } }, "Qg4": { "_metadata": { "eco": "C19", "name": "French Defense: Winawer Variation, Advance Variation" }, "Kf8": { "_metadata": { "eco": "C19", "name": "French Defense: Winawer Variation, Eingorn Variation" } }, "Qc7": { "_metadata": { "eco": "C19", "name": "French Defense: Winawer Variation, Poisoned Pawn Variation" }, "Qxg7": { "Rg8": { "Qxh7": { "cxd4": { "Ne2": { "_metadata": { "eco": "C19", "name": "French Defense: Winawer Variation, Poisoned Pawn Variation, Main Line" } }, "Kd1": { "_metadata": { "eco": "C19", "name": "French Defense: Winawer Variation, Poisoned Pawn Variation, Paoli Variation" } } } } } } }, "O-O": { "_metadata": { "eco": "C19", "name": "French Defense: Winawer Variation, Warsaw Variation" } } }, "Nf3": { "_metadata": { "eco": "C19", "name": "French Defense: Winawer Variation, Positional Variation" } } } } } }, "Qg4": { "_metadata": { "eco": "C17", "name": "French Defense: Winawer Variation, Advance Variation, Moscow Variation" } }, "Bd2": { "_metadata": { "eco": "C17", "name": "French Defense: Winawer Variation, Bogoljubow Variation" }, "Ne7": { "f4": { "_metadata": { "eco": "C17", "name": "French Defense: Winawer Variation, Bogoljubow Variation, Icelandic Defense" } } } } } } } }, "e5": { "_metadata": { "eco": "C02", "name": "French Defense: Advance Variation" }, "c5": { "_metadata": { "eco": "C02", "name": "French Defense: Advance Variation" }, "c3": { "_metadata": { "eco": "C02", "name": "French Defense: Advance Variation" }, "Nc6": { "_metadata": { "eco": "C02", "name": "French Defense: Advance Variation" }, "Nf3": { "Bd7": { "_metadata": { "eco": "C02", "name": "French Defense: Advance Variation, Euwe Variation" } }, "Qb6": { "a3": { "Nh6": { "_metadata": { "eco": "C02", "name": "French Defense: Advance Variation, Lputian Variation" } }, "_metadata": { "eco": "C02", "name": "French Defense: Advance Variation, Main Line" } }, "Bd3": { "_metadata": { "eco": "C02", "name": "French Defense: Advance Variation, Milner-Barry Gambit" }, "cxd4": { "O-O": { "_metadata": { "eco": "C02", "name": "French Defense: Advance Variation, Milner-Barry Gambit, Hector Variation" }, "Bd7": { "Re1": { "_metadata": { "eco": "C02", "name": "French Defense: Advance Variation, Milner-Barry Gambit, Hector Variation" } } } }, "cxd4": { "Bd7": { "O-O": { "_metadata": { "eco": "C02", "name": "French Defense: Advance Variation, Milner-Barry Gambit, Main Line" }, "Nxd4": { "Ng5": { "_metadata": { "eco": "C02", "name": "French Defense: Advance Variation, Milner-Barry Gambit, Sirensen Variation" } } } } } } } } }, "_metadata": { "eco": "C02", "name": "French Defense: Advance Variation, Paulsen Attack" } } }, "Qb6": { "Nf3": { "Bd7": { "_metadata": { "eco": "C02", "name": "French Defense: Advance Variation, Wade Variation" } } } } }, "b4": { "_metadata": { "eco": "C02", "name": "French Defense: Advance Variation, Frenkel Gambit" } }, "Qg4": { "_metadata": { "eco": "C02", "name": "French Defense: Advance Variation, Nimzowitsch Attack" }, "cxd4": { "Nf3": { "_metadata": { "eco": "C02", "name": "French Defense: Advance Variation, Nimzowitsch Gambit" } } } }, "Nf3": { "_metadata": { "eco": "C02", "name": "French Defense: Advance Variation, Nimzowitsch System" }, "cxd4": { "Bd3": { "_metadata": { "eco": "C02", "name": "French Defense: Advance Variation, Ruisdonk Gambit" } } } }, "dxc5": { "_metadata": { "eco": "C02", "name": "French Defense: Advance Variation, Steinitz Variation" } } }, "Bd7": { "_metadata": { "eco": "C02", "name": "French Defense: Advance Variation, Extended Bishop Swap" } } }, "Nd2": { "Nc6": { "c3": { "dxe4": { "Nxe4": { "e5": { "_metadata": { "eco": "C03", "name": "French Defense: Guimard Variation, Thunderbunny Variation" } } } } }, "_metadata": { "eco": "C03", "name": "French Defense: Tarrasch Variation, Guimard Defense" }, "Ngf3": { "Nf6": { "_metadata": { "eco": "C04", "name": "French Defense: Tarrasch Variation, Guimard Defense, Main Line" } } } }, "_metadata": { "eco": "C03", "name": "French Defense: Tarrasch Variation" }, "f5": { "_metadata": { "eco": "C03", "name": "French Defense: Tarrasch Variation, Haberditz Variation" } }, "a6": { "_metadata": { "eco": "C03", "name": "French Defense: Tarrasch Variation, Modern System" } }, "Be7": { "_metadata": { "eco": "C03", "name": "French Defense: Tarrasch Variation, Morozevich Variation" } }, "Nf6": { "e5": { "Nfd7": { "Bd3": { "c5": { "c3": { "b6": { "_metadata": { "eco": "C05", "name": "French Defense: Tarrasch Variation, Botvinnik Variation" } }, "Nc6": { "_metadata": { "eco": "C05", "name": "French Defense: Tarrasch Variation, Closed Variation" }, "Ne2": { "cxd4": { "cxd4": { "_metadata": { "eco": "C06", "name": "French Defense: Tarrasch Variation, Closed Variation, Main Line" }, "Nb6": { "_metadata": { "eco": "C06", "name": "French Defense: Tarrasch Variation, Leningrad Variation" } } } } } } } } }, "f4": { "_metadata": { "eco": "C05", "name": "French Defense: Tarrasch Variation, Pawn Center Variation" } } } }, "_metadata": { "eco": "C05", "name": "French Defense: Tarrasch Variation, Closed Variation" } }, "c5": { "exd5": { "Qxd5": { "_metadata": { "eco": "C07", "name": "French Defense: Tarrasch Variation, Chistyakov Defense" }, "Ngf3": { "cxd4": { "Bc4": { "Qd6": { "O-O": { "Nf6": { "Nb3": { "Nc6": { "Nbxd4": { "Nxd4": { "Nxd4": { "a6": { "_metadata": { "eco": "C07", "name": "French Defense: Tarrasch Variation, Chistyakov Defense, Modern Line" } } } } } } } } } }, "Qd8": { "_metadata": { "eco": "C07", "name": "French Defense: Tarrasch Variation, Eliskases Variation" } } } } } }, "Nf6": { "_metadata": { "eco": "C07", "name": "French Defense: Tarrasch Variation, Open System, Shaposhnikov Gambit" } }, "exd5": { "_metadata": { "eco": "C08", "name": "French Defense: Tarrasch Variation, Open System" }, "Ngf3": { "c4": { "_metadata": { "eco": "C08", "name": "French Defense: Tarrasch Variation, Open System, Advance Line" } }, "Nc6": { "_metadata": { "eco": "C09", "name": "French Defense: Tarrasch Variation, Open System, Main Line" } } } } }, "_metadata": { "eco": "C07", "name": "French Defense: Tarrasch Variation, Open System" }, "Ngf3": { "_metadata": { "eco": "C07", "name": "French Defense: Tarrasch Variation, Open System, Euwe-Keres Line" } }, "c3": { "_metadata": { "eco": "C07", "name": "French Defense: Tarrasch Variation, Open System, S\u00fcchting Line" } } }, "dxe4": { "Nxe4": { "Nd7": { "Nf3": { "Ngf6": { "Nxf6+": { "Nxf6": { "c3": { "_metadata": { "eco": "C10", "name": "French Defense: Rubinstein Variation, Kasparov Attack" } } } } } } } } } } }, "b5": { "_metadata": { "eco": "C00", "name": "French Defense: Baeuerle Gambit" } }, "f5": { "_metadata": { "eco": "C00", "name": "French Defense: Franco-Hiva Gambit" }, "exf5": { "_metadata": { "eco": "C00", "name": "French Defense: Franco-Hiva Gambit Accepted" } } }, "Nf6": { "_metadata": { "eco": "C00", "name": "French Defense: Mediterranean Defense" } }, "_metadata": { "eco": "C00", "name": "French Defense: Normal Variation" }, "a6": { "_metadata": { "eco": "C00", "name": "French Defense: St. George Defense" }, "c4": { "b5": { "_metadata": { "eco": "C00", "name": "French Defense: St. George Defense, Sanky-George Gambit" }, "cxb5": { "axb5": { "_metadata": { "eco": "C00", "name": "French Defense: St. George Defense, St. George Gambit" } } } }, "_metadata": { "eco": "C00", "name": "French Defense: St. George Defense, Three Pawn Attack" } }, "Nf3": { "b5": { "Bd3": { "c5": { "c3": { "Bb7": { "O-O": { "Nf6": { "_metadata": { "eco": "C00", "name": "French Defense: St. George Defense, Traditional Line" } } } } } } } } } } }, "_metadata": { "eco": "C00", "name": "French Defense" }, "b4": { "_metadata": { "eco": "C00", "name": "French Defense: Banzai-Leong Gambit" }, "Bxb4": { "e5": { "_metadata": { "eco": "C00", "name": "French Defense: Banzai-Leong Gambit, Pinova Gambit" } } } }, "Bb5": { "_metadata": { "eco": "C00", "name": "French Defense: Bird Invitation" } }, "Qe2": { "_metadata": { "eco": "C00", "name": "French Defense: Chigorin Variation" } }, "b3": { "_metadata": { "eco": "C00", "name": "French Defense: Horwitz Attack" }, "d5": { "Bb2": { "_metadata": { "eco": "C00", "name": "French Defense: Horwitz Attack, Papa-Ticulat Gambit" } } } }, "Nf3": { "_metadata": { "eco": "C00", "name": "French Defense: Knight Variation" }, "f5": { "_metadata": { "eco": "C00", "name": "French Defense: Knight Variation, Franco-Hiva Gambit" } }, "d5": { "Nc3": { "_metadata": { "eco": "C00", "name": "French Defense: Two Knights Variation" } }, "e5": { "c5": { "b4": { "_metadata": { "eco": "C00", "name": "French Defense: Wing Gambit" } } } } } }, "f4": { "_metadata": { "eco": "C00", "name": "French Defense: La Bourdonnais Variation" }, "d5": { "Nf3": { "dxe4": { "_metadata": { "eco": "C00", "name": "French Defense: La Bourdonnais Variation, Reuter Gambit" } } } } }, "c4": { "d5": { "cxd5": { "exd5": { "Qb3": { "_metadata": { "eco": "C00", "name": "French Defense: Orthoschnapp Gambit" } } } } }, "_metadata": { "eco": "C00", "name": "French Defense: Steiner Variation" } }, "Nc3": { "d5": { "f4": { "_metadata": { "eco": "C00", "name": "French Defense: Pelikan Variation" } }, "d4": { "Nf6": { "Bg5": { "Bb4": { "e5": { "h6": { "Bd2": { "Bxc3": { "bxc3": { "Ne4": { "Qg4": { "Kf8": { "Bc1": { "_metadata": { "eco": "C12", "name": "French Defense: MacCutcheon Variation, Duras Variation" } } } } } } } } } } } } } } }, "_metadata": { "eco": "C00", "name": "French Defense: Queen's Knight" } }, "g3": { "_metadata": { "eco": "C00", "name": "French Defense: R\u00fcti-Spielmann Attack" } }, "e5": { "_metadata": { "eco": "C00", "name": "French Defense: Steinitz Attack" } } }, "d6": { "d4": { "f5": { "_metadata": { "eco": "A82", "name": "Rat Defense: Balogh Defense" } }, "Nf6": { "f3": { "_metadata": { "eco": "B00", "name": "Lion Defense: Lion's Jaw" } }, "_metadata": { "eco": "B00", "name": "Pirc Defense" }, "Nf3": { "_metadata": { "eco": "B00", "name": "Pirc Defense: Roscher Gambit" } }, "Nc3": { "c6": { "_metadata": { "eco": "B07", "name": "Czech Defense" } }, "Nbd7": { "f4": { "_metadata": { "eco": "B07", "name": "Lion Defense: Anti-Philidor" }, "e5": { "_metadata": { "eco": "B07", "name": "Lion Defense: Anti-Philidor, Lion's Cave" }, "Nf3": { "exd4": { "Qxd4": { "c6": { "Bc4": { "d5": { "_metadata": { "eco": "B07", "name": "Lion Defense: Anti-Philidor, Lion's Cave, Lion Claw Gambit" } } } } } } } } }, "g4": { "_metadata": { "eco": "B07", "name": "Lion Defense: Bayonet Attack" } }, "Nf3": { "e5": { "Bc4": { "Be7": { "dxe5": { "dxe5": { "Bxf7+": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Lion Variation, Delayed Bishop Sacrifice" } } } } } } } } }, "g6": { "_metadata": { "eco": "B07", "name": "Pirc Defense" }, "Be3": { "c6": { "Qd2": { "_metadata": { "eco": "B07", "name": "Pirc Defense: 150 Attack" }, "Bg4": { "_metadata": { "eco": "B07", "name": "Pirc Defense: 150 Attack, Inner Doll Defense" } } }, "h3": { "_metadata": { "eco": "B07", "name": "Pirc Defense: 150 Attack, Sveshnikov-Jansa Attack" } } } }, "Be2": { "Bg7": { "h4": { "_metadata": { "eco": "B07", "name": "Pirc Defense: Bayonet Attack" } }, "g4": { "_metadata": { "eco": "B07", "name": "Pirc Defense: Chinese Variation" } } } }, "Bg5": { "_metadata": { "eco": "B07", "name": "Pirc Defense: Byrne Variation" } }, "Bc4": { "_metadata": { "eco": "B07", "name": "Pirc Defense: Kholmov System" } }, "g3": { "_metadata": { "eco": "B07", "name": "Pirc Defense: Sveshnikov System" } }, "Nf3": { "_metadata": { "eco": "B08", "name": "Pirc Defense: Classical Variation" }, "Bg7": { "_metadata": { "eco": "B08", "name": "Pirc Defense: Classical Variation" }, "Be2": { "_metadata": { "eco": "B08", "name": "Pirc Defense: Classical Variation, Quiet System" }, "O-O": { "O-O": { "Nc6": { "_metadata": { "eco": "B08", "name": "Pirc Defense: Classical Variation, Quiet System, Chigorin Line" } }, "c6": { "_metadata": { "eco": "B08", "name": "Pirc Defense: Classical Variation, Quiet System, Czech Defense" } }, "Bg4": { "_metadata": { "eco": "B08", "name": "Pirc Defense: Classical Variation, Quiet System, Parma Defense" } } } } }, "h3": { "_metadata": { "eco": "B08", "name": "Pirc Defense: Classical Variation, Schlechter Variation" } } } }, "f4": { "_metadata": { "eco": "B09", "name": "Pirc Defense: Austrian Attack" }, "Bg7": { "Nf3": { "O-O": { "_metadata": { "eco": "B09", "name": "Pirc Defense: Austrian Attack" }, "Be3": { "_metadata": { "eco": "B09", "name": "Pirc Defense: Austrian Attack, Kurajica Variation" } }, "e5": { "_metadata": { "eco": "B09", "name": "Pirc Defense: Austrian Attack, Unzicker Attack" }, "Nfd7": { "h4": { "_metadata": { "eco": "B09", "name": "Pirc Defense: Austrian Attack, Unzicker Attack, Bronstein Variation" } } } }, "Bd3": { "_metadata": { "eco": "B09", "name": "Pirc Defense: Austrian Attack, Weiss Variation" } } }, "c5": { "_metadata": { "eco": "B09", "name": "Pirc Defense: Austrian Attack, Dragon Formation" } } }, "Bc4": { "_metadata": { "eco": "B09", "name": "Pirc Defense: Austrian Attack, Ljubojevic Variation" } } } } }, "e5": { "Nf3": { "Nbd7": { "Bc4": { "Be7": { "O-O": { "O-O": { "Qe2": { "c6": { "a4": { "exd4": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Lion Variation, Sozin Variation" } } } } } } } } } } } } } }, "_metadata": { "eco": "B00", "name": "Pirc Defense" }, "Nd7": { "_metadata": { "eco": "B00", "name": "Rat Defense: Antal Defense" } }, "e5": { "_metadata": { "eco": "B07", "name": "King's Pawn Game: Mar\u00f3czy Defense" } } }, "_metadata": { "eco": "B00", "name": "Pirc Defense" }, "f4": { "d5": { "exd5": { "Nf6": { "_metadata": { "eco": "B00", "name": "Rat Defense: Fuller Gambit" } } } }, "_metadata": { "eco": "B00", "name": "Rat Defense: Harmonist" } }, "h4": { "_metadata": { "eco": "B00", "name": "Rat Defense: Petruccioli Attack" } }, "g4": { "_metadata": { "eco": "B00", "name": "Rat Defense: Spike Attack" } } }, "f6": { "_metadata": { "eco": "B00", "name": "Barnes Defense" }, "d4": { "Kf7": { "_metadata": { "eco": "B00", "name": "Fried Fox Defense" } }, "b6": { "c4": { "Bb7": { "_metadata": { "eco": "B00", "name": "Owen Defense: Unicorn Variation" } } } } } }, "g5": { "_metadata": { "eco": "B00", "name": "Borg Defense" }, "d4": { "Bg7": { "_metadata": { "eco": "B00", "name": "Borg Defense: Borg Gambit" } }, "h6": { "h4": { "g4": { "_metadata": { "eco": "B00", "name": "Borg Defense: Troon Gambit" } } } }, "e5": { "_metadata": { "eco": "B00", "name": "Borg Defense: Zilbermints Gambit" } } } }, "h6": { "_metadata": { "eco": "B00", "name": "Carr Defense" }, "d4": { "e5": { "_metadata": { "eco": "B00", "name": "Carr Defense: Zilbermints Gambit" } } } }, "f5": { "_metadata": { "eco": "B00", "name": "Duras Gambit" } }, "h5": { "_metadata": { "eco": "B00", "name": "Goldsmith Defense" }, "d4": { "Nf6": { "_metadata": { "eco": "B00", "name": "Goldsmith Defense: Picklepuss Defense" } } } }, "Nh6": { "_metadata": { "eco": "B00", "name": "Hippopotamus Defense" }, "d4": { "g6": { "c4": { "f6": { "_metadata": { "eco": "B00", "name": "Hippopotamus Defense" } } } } } }, "_metadata": { "eco": "B00", "name": "King's Pawn Game" }, "Na6": { "_metadata": { "eco": "B00", "name": "Lemming Defense" } }, "Nc6": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense" }, "d4": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense" }, "d5": { "Be3": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Hornung Gambit" } }, "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Scandinavian Variation" }, "exd5": { "Nb4": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Scandinavian Variation, Aachen Gambit" } }, "Qxd5": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Scandinavian Variation, Exchange Variation" }, "Nc3": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Scandinavian Variation, Exchange Variation, Marshall Gambit" } } } }, "e5": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Scandinavian Variation, Advance Variation" } }, "Nc3": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation" }, "dxe4": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation" }, "d5": { "Ne5": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Nimzowitsch Gambit" } }, "Nb8": { "f3": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Richter Gambit" } } }, "_metadata": { "eco": "B00", "name": "Van Geet Opening: Berlin Gambit" } } }, "a6": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Brandics Gambit" } }, "g6": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Erben Gambit" } }, "e5": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Heinola-Deppe Gambit" } }, "Nf6": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Vehre Variation" } } } }, "e5": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Kennedy Variation" }, "dxe5": { "Bc5": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Kennedy Variation, Bielefelder Gambit" } }, "f6": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Kennedy Variation, Hammer Gambit" } }, "Qh4": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Kennedy Variation, Herford Gambit" } }, "Nxe5": { "Nc3": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Kennedy Variation, Keres Attack" } }, "f4": { "Ng6": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Kennedy Variation, Main Line" } }, "Nc6": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Kennedy Variation, Riemann Defense" } } }, "Nf3": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Kennedy Variation, Paulsen Attack" } } }, "d6": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Kennedy Variation, de Smet Gambit" } } }, "d5": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Kennedy Variation, Linksspringer Variation" } } }, "d6": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Mikenas Variation" } }, "f6": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Neo-Mongoloid Defense" } }, "a6": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Woodchuck Variation" } } }, "Nc3": { "Nf6": { "d4": { "e5": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Breyer Variation" } } } }, "e6": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: French Connection" } }, "g6": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Pirc Connection" } } }, "Nf3": { "f5": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Colorado Countergambit" }, "exf5": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Colorado Countergambit Accepted" } } }, "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Declined Variation" }, "Nf6": { "e5": { "Ng4": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: El Columpio Defense" }, "d4": { "d6": { "h3": { "Nh6": { "e6": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: El Columpio Defense, El Columpio Gambit" } }, "exd6": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: El Columpio Defense, Exchange Variation" } }, "Bb5": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: El Columpio Defense, Pin Variation" } } } } } } } } }, "e6": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Franco-Nimzowitsch Variation" } }, "d6": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Williams Variation" } } }, "Bb5": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Pseudo-Spanish Variation" } }, "b4": { "_metadata": { "eco": "B00", "name": "Nimzowitsch Defense: Wheeler Gambit" } } }, "b6": { "_metadata": { "eco": "B00", "name": "Owen Defense" }, "d4": { "Ba6": { "_metadata": { "eco": "B00", "name": "Owen Defense: Guatemala Defense" } }, "c5": { "dxc5": { "Nc6": { "_metadata": { "eco": "B00", "name": "Owen Defense: Hekili-Loa Gambit" } } } }, "Bb7": { "Bd3": { "f5": { "exf5": { "Bxg2": { "Qh5+": { "g6": { "_metadata": { "eco": "B00", "name": "Owen Defense: Matovinsky Gambit" } } } } } } }, "Bg5": { "_metadata": { "eco": "B00", "name": "Owen Defense: Naselwaus Gambit" } }, "Nf3": { "_metadata": { "eco": "B00", "name": "Owen Defense: Smith Gambit" } }, "f3": { "e5": { "_metadata": { "eco": "B00", "name": "Owen Defense: Wind Gambit" } } } } } }, "a6": { "_metadata": { "eco": "B00", "name": "St. George Defense" }, "d4": { "b5": { "Nf3": { "Bb7": { "Bd3": { "e6": { "_metadata": { "eco": "B00", "name": "St. George Defense: Polish Variation" } }, "d6": { "O-O": { "g6": { "c3": { "Bg7": { "_metadata": { "eco": "B00", "name": "St. George Defense: San Jorge Variation" } } } } } } } } } }, "e5": { "_metadata": { "eco": "B00", "name": "St. George Defense: Zilbermints Gambit" } } } }, "a5": { "_metadata": { "eco": "B00", "name": "Ware Defense" }, "d4": { "Nc6": { "_metadata": { "eco": "B00", "name": "Ware Defense: Snagglepuss Defense" } } } }, "Nf6": { "_metadata": { "eco": "B02", "name": "Alekhine Defense" }, "e5": { "Ng8": { "_metadata": { "eco": "B02", "name": "Alekhine Defense: Brooklyn Variation" }, "d4": { "f5": { "_metadata": { "eco": "B02", "name": "Alekhine Defense: Brooklyn Variation, Everglades Variation" } } } }, "Nd5": { "Na3": { "_metadata": { "eco": "B02", "name": "Alekhine Defense: Buckley Attack" } }, "c4": { "Nb6": { "c5": { "Nd5": { "Bc4": { "e6": { "Nc3": { "_metadata": { "eco": "B02", "name": "Alekhine Defense: Hunt Variation, Lasker Simul Gambit" }, "d6": { "Nxd5": { "exd5": { "Bxd5": { "_metadata": { "eco": "B02", "name": "Alekhine Defense: Hunt Variation, Mikenas Gambit" } } } }, "_metadata": { "eco": "B02", "name": "Alekhine Defense: Two Pawns Attack, Mikenas Variation" } } } } }, "Nc3": { "Nxc3": { "dxc3": { "d6": { "Bg5": { "_metadata": { "eco": "B02", "name": "Alekhine Defense: Hunt Variation, Matsukevich Gambit" } } } } } } }, "_metadata": { "eco": "B02", "name": "Alekhine Defense: Two Pawns Attack, Lasker Variation" } }, "b3": { "_metadata": { "eco": "B02", "name": "Alekhine Defense: Steiner Variation" } }, "a4": { "_metadata": { "eco": "B02", "name": "Alekhine Defense: Two Pawns Attack, Tate Variation" } } }, "Nf4": { "_metadata": { "eco": "B02", "name": "Alekhine Defense: The Squirrel" } }, "_metadata": { "eco": "B02", "name": "Alekhine Defense: Two Pawns Attack" } }, "Bc4": { "Nb6": { "Bb3": { "c5": { "d3": { "_metadata": { "eco": "B02", "name": "Alekhine Defense: Kmoch Variation" } } } } } }, "_metadata": { "eco": "B02", "name": "Alekhine Defense: Normal Variation" }, "Nc3": { "_metadata": { "eco": "B02", "name": "Alekhine Defense: S\u00e4misch Attack" } }, "b3": { "_metadata": { "eco": "B02", "name": "Alekhine Defense: Welling Variation" } }, "d4": { "_metadata": { "eco": "B03", "name": "Alekhine Defense" }, "d6": { "_metadata": { "eco": "B03", "name": "Alekhine Defense" }, "c4": { "_metadata": { "eco": "B03", "name": "Alekhine Defense" }, "Nb6": { "exd6": { "_metadata": { "eco": "B03", "name": "Alekhine Defense: Exchange Variation" }, "cxd6": { "Nc3": { "g6": { "h3": { "Bg7": { "Nf3": { "O-O": { "Be2": { "Nc6": { "O-O": { "Bf5": { "1Bf4": { "_metadata": { "eco": "B03", "name": "Alekhine Defense: Exchange Variation, Karpov Variation" } } } } } } } } } }, "Be3": { "Bg7": { "Rc1": { "O-O": { "b3": { "_metadata": { "eco": "B03", "name": "Alekhine Defense: Exchange Variation, Voronezh Variation" } } } } } } } } } }, "f4": { "_metadata": { "eco": "B03", "name": "Alekhine Defense: Four Pawns Attack" }, "g5": { "_metadata": { "eco": "B03", "name": "Alekhine Defense: Four Pawns Attack, Cambridge Gambit" } }, "g6": { "_metadata": { "eco": "B03", "name": "Alekhine Defense: Four Pawns Attack, Fianchetto Variation" } }, "dxe5": { "fxe5": { "Nc6": { "Nf3": { "Bg4": { "e6": { "fxe6": { "c5": { "_metadata": { "eco": "B03", "name": "Alekhine Defense: Four Pawns Attack, Ilyin-Zhenevsky Variation" } } } } } }, "Be3": { "_metadata": { "eco": "B03", "name": "Alekhine Defense: Four Pawns Attack, Main Line" }, "Bf5": { "Nc3": { "e6": { "Nf3": { "Qd7": { "Be2": { "O-O-O": { "1O-O": { "Be7": { "_metadata": { "eco": "B03", "name": "Alekhine Defense: Four Pawns Attack, Tartakower Variation" } } } } } } } } } } } }, "Bf5": { "Nc3": { "e6": { "Nf3": { "Be7": { "Be2": { "O-O": { "O-O": { "f6": { "_metadata": { "eco": "B03", "name": "Alekhine Defense: Four Pawns Attack, Korchnoi Variation" } } } } } } } } } } } }, "Bf5": { "_metadata": { "eco": "B03", "name": "Alekhine Defense: Four Pawns Attack, Trifunovic Variation" } } }, "c5": { "_metadata": { "eco": "B03", "name": "Alekhine Defense: Hunt Variation" } }, "Nf3": { "Bg4": { "Be2": { "_metadata": { "eco": "B03", "name": "Alekhine Defense: Modern Variation, Alekhine Gambit" } } } } } }, "Bc4": { "_metadata": { "eco": "B03", "name": "Alekhine Defense: Balogh Variation" } }, "Nf3": { "_metadata": { "eco": "B04", "name": "Alekhine Defense: Modern Variation" }, "g6": { "_metadata": { "eco": "B04", "name": "Alekhine Defense: Modern Variation, Alburt Variation" }, "Bc4": { "Nb6": { "Bb3": { "Bg7": { "a4": { "_metadata": { "eco": "B04", "name": "Alekhine Defense: Modern Variation, Keres Variation" } } } } } } }, "dxe5": { "_metadata": { "eco": "B04", "name": "Alekhine Defense: Modern Variation, Larsen Variation" } }, "Nc6": { "_metadata": { "eco": "B04", "name": "Alekhine Defense: Modern Variation, Larsen-Haakert Variation" } }, "Nb6": { "_metadata": { "eco": "B04", "name": "Alekhine Defense: Modern Variation, Schmid Variation" } }, "Bg4": { "c4": { "_metadata": { "eco": "B05", "name": "Alekhine Defense: Modern Variation, Alekhine Variation" }, "Nb6": { "d5": { "_metadata": { "eco": "B05", "name": "Alekhine Defense: Modern Variation, Vitolins Attack" } } } }, "Be2": { "c6": { "_metadata": { "eco": "B05", "name": "Alekhine Defense: Modern Variation, Flohr Variation" } } }, "_metadata": { "eco": "B05", "name": "Alekhine Defense: Modern Variation, Main Line" }, "h3": { "_metadata": { "eco": "B05", "name": "Alekhine Defense: Modern Variation, Panov Variation" } } } } }, "b5": { "_metadata": { "eco": "B03", "name": "Alekhine Defense: O'Sullivan Gambit" } } } }, "Ne4": { "_metadata": { "eco": "B02", "name": "Alekhine Defense: Mokele Mbembe" }, "d4": { "f6": { "_metadata": { "eco": "B02", "name": "Alekhine Defense: Mokele Mbembe, Modern Line" } }, "e6": { "_metadata": { "eco": "B02", "name": "Alekhine Defense: Mokele Mbembe, Vavra Defense" } } } } }, "Bc4": { "_metadata": { "eco": "B02", "name": "Alekhine Defense: Krejcik Variation" }, "Nxe4": { "Bxf7+": { "_metadata": { "eco": "B02", "name": "Alekhine Defense: Krejcik Variation, Krejcik Gambit" } } } }, "d3": { "_metadata": { "eco": "B02", "name": "Alekhine Defense: Mar\u00f3czy Variation" } }, "Nc3": { "d5": { "_metadata": { "eco": "B02", "name": "Alekhine Defense: Scandinavian Variation" }, "exd5": { "c6": { "_metadata": { "eco": "B02", "name": "Alekhine Defense: Scandinavian Variation, Geschev Gambit" } } }, "d3": { "dxe4": { "Bg5": { "_metadata": { "eco": "B02", "name": "Alekhine Defense: Scandinavian Variation, Myers Gambit" } } } }, "e5": { "Nfd7": { "e6": { "_metadata": { "eco": "B02", "name": "Alekhine Defense: Spielmann Gambit" } } } } } } }, "g6": { "_metadata": { "eco": "B06", "name": "Modern Defense" }, "d4": { "Bg7": { "_metadata": { "eco": "B06", "name": "Modern Defense" }, "Nc3": { "c6": { "Bc4": { "d6": { "Qe2": { "_metadata": { "eco": "B06", "name": "Modern Defense: Anti-Modern" } } } }, "f4": { "d5": { "e5": { "h5": { "_metadata": { "eco": "B06", "name": "Modern Defense: Gurgenidze Defense" } } } } }, "Nf3": { "d6": { "_metadata": { "eco": "B06", "name": "Modern Defense: Two Knights Variation, Suttles Variation" } } } }, "d5": { "_metadata": { "eco": "B06", "name": "Modern Defense: Lizard Defense, Mittenberger Gambit" } }, "c5": { "_metadata": { "eco": "B06", "name": "Modern Defense: Modern Pterodactyl" }, "Be3": { "_metadata": { "eco": "B06", "name": "Pterodactyl Defense: Eastern, Anhanguera" } }, "d5": { "Bxc3+": { "bxc3": { "Qa5": { "_metadata": { "eco": "B06", "name": "Pterodactyl Defense: Eastern, Benoni Pteranodon" } } } } }, "dxc5": { "Bxc3+": { "bxc3": { "Qa5": { "_metadata": { "eco": "B06", "name": "Pterodactyl Defense: Eastern, Pteranodon" } } } }, "Qa5": { "_metadata": { "eco": "B06", "name": "Pterodactyl Defense: Eastern, Pterodactyl" } }, "_metadata": { "eco": "B06", "name": "Pterodactyl Defense: Eastern, Rhamphorhynchus" } }, "Nf3": { "Qa5": { "Be2": { "d6": { "_metadata": { "eco": "B06", "name": "Pterodactyl Defense: Sicilian, Quetzalcoatlus" } } }, "Bc4": { "_metadata": { "eco": "B06", "name": "Pterodactyl Defense: Sicilian, Siroccopteryx" } } } } }, "b6": { "_metadata": { "eco": "B06", "name": "Modern Defense: Mongredien Defense, with Nc3" } }, "d6": { "f4": { "_metadata": { "eco": "B06", "name": "Modern Defense: Pseudo-Austrian Attack" } }, "_metadata": { "eco": "B06", "name": "Modern Defense: Standard Defense" }, "Nf3": { "_metadata": { "eco": "B06", "name": "Modern Defense: Two Knights Variation" }, "c6": { "Bg5": { "Qb6": { "Qd2": { "Qxb2": { "_metadata": { "eco": "B06", "name": "Modern Defense: Two Knights Variation, Suttles Variation, Tal Gambit" } } } } } } } }, "_metadata": { "eco": "B06", "name": "Modern Defense: Standard Line" } }, "Bc4": { "_metadata": { "eco": "B06", "name": "Modern Defense: Bishop Attack" }, "b5": { "_metadata": { "eco": "B06", "name": "Modern Defense: Bishop Attack, B\u00fccker Gambit" } } }, "c4": { "d5": { "exd5": { "c6": { "dxc6": { "Bxd4": { "_metadata": { "eco": "B06", "name": "Modern Defense: Dunworthy Variation" } } } } } }, "c5": { "Nf3": { "d6": { "Be2": { "Qa5+": { "_metadata": { "eco": "B06", "name": "Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation Declined" } } } } }, "Nc3": { "d6": { "Be3": { "Qa5": { "_metadata": { "eco": "B06", "name": "Pterodactyl Defense: Central, Anhanguera" } } }, "dxc5": { "Qa5": { "_metadata": { "eco": "B06", "name": "Pterodactyl Defense: Central, Quetzalcoatlus Gambit" } } } } }, "d5": { "d6": { "Nc3": { "Qa5": { "_metadata": { "eco": "B06", "name": "Pterodactyl Defense: Central, Benoni Quetzalcoatlus" } } } } } } }, "Nf3": { "b6": { "_metadata": { "eco": "B06", "name": "Modern Defense: Mongredien Defense, with Nf3" } }, "c5": { "Be3": { "Qa5+": { "_metadata": { "eco": "B06", "name": "Pterodactyl Defense: Western, Anhanguera" } } } }, "d6": { "c3": { "_metadata": { "eco": "B07", "name": "Modern Defense: Geller's System" } } } }, "f4": { "_metadata": { "eco": "B06", "name": "Modern Defense: Three Pawns Attack" }, "c5": { "Nf3": { "Qa5+": { "_metadata": { "eco": "B06", "name": "Pterodactyl Defense: Austrian, Austriadactylus Western" } } }, "c3": { "Qa5": { "_metadata": { "eco": "B06", "name": "Pterodactyl Defense: Austrian, Pteranodon" } } } } }, "Bd2": { "_metadata": { "eco": "B06", "name": "Modern Defense: Westermann Gambit" } }, "Bd3": { "_metadata": { "eco": "B06", "name": "Modern Defense: Wind Gambit" } }, "g3": { "c5": { "Nf3": { "Qa5+": { "_metadata": { "eco": "B06", "name": "Pterodactyl Defense: Fianchetto, King Pterodactyl" } } }, "dxc5": { "Qa5+": { "_metadata": { "eco": "B06", "name": "Pterodactyl Defense: Fianchetto, Rhamphorhynchus" } } } } } }, "f5": { "_metadata": { "eco": "B06", "name": "Modern Defense: Fianchetto Gambit" } }, "Nh6": { "Nc3": { "f5": { "Bxh6": { "Bxh6": { "exf5": { "O-O": { "_metadata": { "eco": "B06", "name": "Modern Defense: Masur Gambit" } } } } } } } }, "Nf6": { "_metadata": { "eco": "B06", "name": "Modern Defense: Norwegian Defense" }, "e5": { "Nh5": { "Be2": { "d6": { "_metadata": { "eco": "B06", "name": "Modern Defense: Norwegian Defense, Norwegian Gambit" } } } } } }, "d6": { "Nc3": { "c6": { "_metadata": { "eco": "B06", "name": "Rat Defense: Accelerated Gurgenidze" } } } } }, "Bc4": { "Bg7": { "Qf3": { "e6": { "d4": { "Bxd4": { "_metadata": { "eco": "B06", "name": "Modern Defense: Bishop Attack, Monkey's Bum" } } } } } } }, "Nc3": { "Bg7": { "f4": { "c5": { "Nf3": { "Qa5": { "_metadata": { "eco": "B06", "name": "Pterodactyl Defense: Austrian, Grand Prix Pterodactyl" } } } } } } }, "Nf3": { "Bg7": { "d4": { "c5": { "Bc4": { "cxd4": { "Nxd4": { "Qa5+": { "_metadata": { "eco": "B06", "name": "Pterodactyl Defense: Western, Siroccopteryx" } } } } } } } } } }, "c6": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense" }, "Nc3": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense" }, "d5": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense" }, "Qf3": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Goldman Variation" } }, "Nf3": { "dxe4": { "Ng5": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Hector Gambit" } } }, "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Two Knights Attack" }, "Bg4": { "_metadata": { "eco": "B11", "name": "Caro-Kann Defense: Two Knights Attack, Mindeno Variation" }, "h3": { "Bxf3": { "_metadata": { "eco": "B11", "name": "Caro-Kann Defense: Two Knights Attack, Mindeno Variation, Exchange Line" } }, "Bh5": { "_metadata": { "eco": "B11", "name": "Caro-Kann Defense: Two Knights Attack, Mindeno Variation, Retreat Line" } } } } }, "d3": { "dxe4": { "Bg5": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Scorpion-Horus Gambit" } } } }, "h3": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: St. Patrick's Attack" } } } }, "c4": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Accelerated Panov Attack" }, "d5": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Accelerated Panov Attack" }, "exd5": { "cxd5": { "cxd5": { "Nf6": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Accelerated Panov Attack, Modern Variation" } } } }, "Qxd5": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Accelerated Panov Attack, Pseudo-Scandinavian" } } }, "cxd5": { "cxd5": { "Qb3": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Accelerated Panov Attack, Van Weersel Attack" } } } }, "e5": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Toikkanen Gambit" } } }, "e5": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Accelerated Panov Attack, Open Variation" } } }, "Nf3": { "d5": { "exd5": { "cxd5": { "Ne5": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Apocalypse Attack" } } } }, "d3": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Endgame Offer" }, "dxe4": { "dxe4": { "Qxd1+": { "Kxd1": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Endgame Variation" } } } } } } } }, "d3": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Breyer Variation" }, "d5": { "Nd2": { "g6": { "Ngf3": { "Bg7": { "g3": { "e5": { "Bg2": { "Ne7": { "O-O": { "O-O": { "b4": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Breyer Variation, Stein Attack" } } } } } } } } } } } } } }, "b3": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Euwe Attack" } }, "Bc4": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Hillbilly Attack" }, "d5": { "Bb3": { "dxe4": { "Qh5": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Hillbilly Attack, Schaeffer Gambit" } } } } } }, "b4": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Labahn Attack" }, "d5": { "b5": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Labahn Attack, Double Gambit" } } }, "e5": { "Bb2": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Labahn Attack, Polish Variation" } } } }, "g4": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Spike Variation" }, "d5": { "Nc3": { "dxe4": { "d3": { "_metadata": { "eco": "B10", "name": "Caro-Kann Defense: Spike Variation, Scorpion-Grob Gambit" } } } } } }, "d4": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense" }, "d5": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense" }, "e5": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense: Advance Variation" }, "Bf5": { "g4": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense: Advance Variation, Bayonet Attack" } }, "Ne2": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense: Advance Variation, Bronstein Variation" } }, "b4": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense: Advance Variation, Prins Attack" } }, "Nf3": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense: Advance Variation, Short Variation" } }, "h4": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense: Advance Variation, Tal Variation" } }, "Nc3": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense: Advance Variation, Van der Wiel Attack" }, "e6": { "g4": { "Bg6": { "Nge2": { "c5": { "h4": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense: Advance Variation, Van der Wiel Attack" } } } } } } }, "Qb6": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense: Advance Variation, Van der Wiel Attack, Dreyev Defense" } } }, "c3": { "e6": { "Be2": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense: Advance, Short Variation" } } } } }, "c5": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense" } } }, "Nd2": { "Qb6": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense: Edinburgh Variation" } }, "_metadata": { "eco": "B12", "name": "Caro-Kann Defense: Modern Variation" }, "dxe4": { "Nxe4": { "_metadata": { "eco": "B15", "name": "Caro-Kann Defense: Main Line" }, "h6": { "_metadata": { "eco": "B16", "name": "Caro-Kann Defense: Finnish Variation" } }, "Nd7": { "_metadata": { "eco": "B17", "name": "Caro-Kann Defense: Karpov Variation" }, "Ng5": { "Ngf6": { "Bd3": { "e6": { "N1f3": { "Bd6": { "Qe2": { "h6": { "Ne4": { "Nxe4": { "Qxe4": { "_metadata": { "eco": "B17", "name": "Caro-Kann Defense: Karpov Variation, Modern Main Line" } } } } } } } } } } }, "_metadata": { "eco": "B17", "name": "Caro-Kann Defense: Karpov Variation, Modern Variation" }, "Ndf6": { "_metadata": { "eco": "B17", "name": "Caro-Kann Defense: Karpov Variation, Modern Variation, Ivanchuk Defense" } } }, "Bc4": { "Ngf6": { "Ng5": { "e6": { "Qe2": { "Nb6": { "_metadata": { "eco": "B17", "name": "Caro-Kann Defense: Karpov Variation, Smyslov Variation" }, "Bb3": { "_metadata": { "eco": "B17", "name": "Caro-Kann Defense: Karpov Variation, Smyslov Variation, Main Line" } } } } } }, "Nxf6+": { "Nxf6": { "_metadata": { "eco": "B17", "name": "Caro-Kann Defense: Karpov Variation, Tiviakov-Fischer Attack" } } } } } }, "Bf5": { "_metadata": { "eco": "B18", "name": "Caro-Kann Defense: Classical Variation" }, "Ng3": { "Bg6": { "Nh3": { "_metadata": { "eco": "B18", "name": "Caro-Kann Defense: Classical Variation, Flohr Variation" } }, "h4": { "_metadata": { "eco": "B18", "name": "Caro-Kann Defense: Classical Variation, Main Line" }, "h6": { "Nf3": { "Nd7": { "_metadata": { "eco": "B19", "name": "Caro-Kann Defense: Classical Variation" }, "h5": { "Bh7": { "Bd3": { "Bxd3": { "Qxd3": { "e6": { "1Bd2": { "Ngf6": { "1O-O-O": { "Be7": { "_metadata": { "eco": "B19", "name": "Caro-Kann Defense: Classical Variation, Lobron System" } } } } } }, "Ngf6": { "1Bd2": { "e6": { "1O-O-O": { "Bd6": { "_metadata": { "eco": "B19", "name": "Caro-Kann Defense: Classical Variation, Seirawan Variation" } } } } } } } } } }, "_metadata": { "eco": "B19", "name": "Caro-Kann Defense: Classical Variation, Spassky Variation" } } } } } }, "f4": { "_metadata": { "eco": "B18", "name": "Caro-Kann Defense: Classical Variation, Mar\u00f3czy Attack" } } } }, "Ng5": { "Bg6": { "N1f3": { "h6": { "Ne6": { "_metadata": { "eco": "B18", "name": "Caro-Kann Defense: Martian Gambit" } } } } } } } } } }, "f3": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense: Mar\u00f3czy Variation" }, "dxe4": { "fxe4": { "e5": { "Nf3": { "exd4": { "Bc4": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense: Mar\u00f3czy Variation, Mar\u00f3czy Gambit" } } } } } } } }, "Bd3": { "Nf6": { "e5": { "Nfd7": { "e6": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense: Mieses Attack, Landau Gambit" } } } } } }, "Be3": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense: Mieses Gambit" } }, "Nf3": { "dxe4": { "Ng5": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense: Ulysses Gambit" } } } }, "exd5": { "_metadata": { "eco": "B13", "name": "Caro-Kann Defense: Exchange Variation" }, "cxd5": { "Nf3": { "Nc6": { "_metadata": { "eco": "B13", "name": "Caro-Kann Defense: Exchange Variation" } } }, "g4": { "_metadata": { "eco": "B13", "name": "Caro-Kann Defense: Exchange Variation, Bulla Attack" } }, "Bd3": { "Nc6": { "c3": { "Nf6": { "Bf4": { "_metadata": { "eco": "B13", "name": "Caro-Kann Defense: Exchange Variation, Rubinstein Variation" } } } } } }, "c4": { "_metadata": { "eco": "B13", "name": "Caro-Kann Defense: Panov Attack" }, "Nf6": { "Nc3": { "_metadata": { "eco": "B13", "name": "Caro-Kann Defense: Panov Attack" }, "Nc6": { "_metadata": { "eco": "B13", "name": "Caro-Kann Defense: Panov Attack, Modern Defense" }, "Bg5": { "e6": { "_metadata": { "eco": "B13", "name": "Caro-Kann Defense: Panov Attack, Modern Defense, Carlsbad Line" } }, "Qa5": { "_metadata": { "eco": "B13", "name": "Caro-Kann Defense: Panov Attack, Modern Defense, Czerniak Line" } }, "Qb6": { "_metadata": { "eco": "B13", "name": "Caro-Kann Defense: Panov Attack, Modern Defense, Reifir-Spielmann Line" } }, "dxc4": { "d5": { "Na5": { "_metadata": { "eco": "B13", "name": "Caro-Kann Defense: Panov-Botvinnik, Herzog Defense" } } } } }, "Nf3": { "Bg4": { "_metadata": { "eco": "B13", "name": "Caro-Kann Defense: Panov Attack, Modern Defense, Mieses Line" } } } }, "e6": { "_metadata": { "eco": "B14", "name": "Caro-Kann Defense: Panov Attack" }, "Nf3": { "Bb4": { "_metadata": { "eco": "B14", "name": "Caro-Kann Defense: Panov Attack, Main Line" } } } }, "g6": { "_metadata": { "eco": "B14", "name": "Caro-Kann Defense: Panov Attack, Fianchetto Defense" }, "cxd5": { "Bg7": { "_metadata": { "eco": "B14", "name": "Caro-Kann Defense: Panov Attack, Fianchetto Defense, Fianchetto Gambit" } } } } }, "c5": { "_metadata": { "eco": "B13", "name": "Caro-Kann Defense: Panov Attack, Gunderam Attack" } } } } } }, "Nc3": { "_metadata": { "eco": "B15", "name": "Caro-Kann Defense" }, "dxe4": { "_metadata": { "eco": "B15", "name": "Caro-Kann Defense" }, "Nxe4": { "Nf6": { "Bd3": { "_metadata": { "eco": "B15", "name": "Caro-Kann Defense: Alekhine Gambit" } }, "Ng5": { "h6": { "Nxf7": { "_metadata": { "eco": "B15", "name": "Caro-Kann Defense: Alien Gambit" } } } }, "Nxf6+": { "exf6": { "Bc4": { "_metadata": { "eco": "B15", "name": "Caro-Kann Defense: Forgacs Variation" } }, "_metadata": { "eco": "B15", "name": "Caro-Kann Defense: Tartakower Variation" } }, "gxf6": { "_metadata": { "eco": "B16", "name": "Caro-Kann Defense: Bronstein-Larsen Variation" } } } }, "Nd7": { "Nf3": { "Ngf6": { "Ng3": { "_metadata": { "eco": "B17", "name": "Caro-Kann Defense: Karpov Variation, Modern Variation, Kasparov Attack" } } } } } }, "f3": { "_metadata": { "eco": "B15", "name": "Caro-Kann Defense: Rasa-Studier Gambit" } }, "Bc4": { "_metadata": { "eco": "B15", "name": "Caro-Kann Defense: von Hennig Gambit" } } }, "Nf6": { "_metadata": { "eco": "B15", "name": "Caro-Kann Defense: Campomanes Attack" } }, "b5": { "_metadata": { "eco": "B15", "name": "Caro-Kann Defense: Gurgenidze Counterattack" } }, "g6": { "_metadata": { "eco": "B15", "name": "Caro-Kann Defense: Gurgenidze System" } } } }, "Na6": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense: De Bruycker Defense" }, "Nc3": { "Nc7": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense: De Bruycker Defense" } } } }, "Nf6": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense: Masi Variation" } }, "f5": { "_metadata": { "eco": "B12", "name": "Caro-Kann Defense: Massachusetts Defense" } } } }, "c5": { "_metadata": { "eco": "B20", "name": "Sicilian Defense" }, "Qg4": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: Amazon Attack" } }, "d3": { "Nc6": { "c3": { "d6": { "f4": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: Big Clamp Formation" } } } } } }, "Bc4": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: Bowdler Attack" } }, "Nh3": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: Brick Variation" } }, "b3": { "d5": { "Bb2": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: Euwe Attack, Prins Gambit" } } }, "_metadata": { "eco": "B20", "name": "Sicilian Defense: Snyder Variation" }, "b6": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: Snyder Variation, Queen Fianchetto Variation" } } }, "c4": { "d6": { "Nc3": { "Nc6": { "g3": { "h5": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: Gloria Variation" } } } } } }, "_metadata": { "eco": "B20", "name": "Sicilian Defense: Staunton-Cochrane Variation" } }, "g4": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: Grob Variation" } }, "Ne2": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: Keres Variation" } }, "Ke2": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: King David's Opening" } }, "Na3": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: Kronberger Variation" }, "Nc6": { "d4": { "cxd4": { "Bc4": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: Kronberger Variation, Nemeth Gambit" } } } } } }, "g3": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: Lasker-Dunne Attack" } }, "a3": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: Mengarini Variation" } }, "a4": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: Myers Attack, with a4" } }, "h4": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: Myers Attack, with h4" } }, "b4": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: Wing Gambit" }, "cxb4": { "Bb2": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: Wing Gambit, Abrahams Variation" } }, "a3": { "bxa3": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: Wing Gambit, Carlsbad Variation" } }, "d5": { "exd5": { "Qxd5": { "Bb2": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: Wing Gambit, Marienbad Variation" } }, "Nf3": { "e5": { "c4": { "Qe6": { "Bd3": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: Wing Gambit, Nanu Gambit" } } } }, "Bb2": { "Nc6": { "c4": { "Qe6": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: Wing Gambit, Romanian Defense" } } } } } } } } } }, "_metadata": { "eco": "B20", "name": "Sicilian Defense: Wing Gambit, Marshall Variation" } }, "c4": { "_metadata": { "eco": "B20", "name": "Sicilian Defense: Wing Gambit, Santasiere Variation" } } } }, "f4": { "d5": { "Nf3": { "dxe4": { "_metadata": { "eco": "B21", "name": "Bird Opening: Dutch Variation, Batavo Gambit" } } }, "exd5": { "Nf6": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: McDonnell Attack, Tal Gambit" } } } }, "_metadata": { "eco": "B21", "name": "Sicilian Defense: McDonnell Attack" }, "e5": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Mafia Defense" } } }, "d4": { "cxd4": { "Qxd4": { "Nc6": { "Qd1": { "Nf6": { "Bc4": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Coles Sicilian Gambit" } } } } } }, "f4": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Halasz Gambit" } }, "Nf3": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Morphy Gambit" }, "e5": { "c3": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Morphy Gambit, Andreaschek Gambit" } } } }, "c3": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit" }, "dxc3": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Accepted" }, "Nxc3": { "Nc6": { "Bc4": { "e6": { "Nf3": { "d6": { "O-O": { "a6": { "Qe2": { "b5": { "Bb3": { "Ra7": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Accepted, Chicago Defense" } } }, "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Accepted, Sozin Formation" } } } } } } } } }, "Nf3": { "d6": { "Bc4": { "a6": { "O-O": { "Nf6": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Accepted, Classical Formation" } } } }, "e6": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Accepted, Scheveningen Formation" } } } }, "g6": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Accepted, Fianchetto Defense" } }, "e6": { "Bc4": { "Qc7": { "Qe2": { "a6": { "O-O": { "Bd6": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Accepted, Larsen Defense" } } } }, "Nf6": { "O-O": { "Ng4": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Accepted, Siberian Variation, Siberian Trap" } } } } }, "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Accepted, Siberian Variation" } }, "Bc5": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Accepted, Morphy Defense" } }, "a6": { "O-O": { "b5": { "Bb3": { "Bc5": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Accepted, Morphy Defense Deferred" } } } } }, "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Accepted, Paulsen Formation" } }, "Bb4": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Accepted, Pin Defense" } } } } } }, "d6": { "Nf3": { "e6": { "Bc4": { "Nf6": { "O-O": { "a6": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Accepted, Chicago Defense" } } } } } } } }, "e6": { "Nf3": { "d6": { "Bc4": { "a6": { "O-O": { "Be7": { "Qe2": { "Nf6": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Accepted, Finegold Defense" } } } } } } } }, "a6": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Accepted, Kan Formation" } } }, "Bc4": { "a6": { "Nf3": { "Ne7": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Accepted, Taimanov Formation" } } } } } } }, "Nf3": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Accepted, Danish Variation" } } }, "Nf6": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Declined, Alapin Formation" } }, "e5": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Declined, Center Formation" } }, "d3": { "c4": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Declined, Dubois Variation" } }, "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Declined, Push Variation" } }, "d5": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Declined, Scandinavian Formation" } }, "Qa5": { "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit Declined, Wing Formation" } } } }, "_metadata": { "eco": "B21", "name": "Sicilian Defense: Smith-Morra Gambit" } }, "c3": { "_metadata": { "eco": "B22", "name": "Sicilian Defense: Alapin Variation" }, "d5": { "exd5": { "Qxd5": { "_metadata": { "eco": "B22", "name": "Sicilian Defense: Alapin Variation, Barmen Defense" }, "d4": { "cxd4": { "cxd4": { "Nc6": { "Nf3": { "Bg4": { "_metadata": { "eco": "B22", "name": "Sicilian Defense: Alapin Variation, Barmen Defense, Central Exchange" }, "Nc3": { "Bxf3": { "gxf3": { "Qxd4": { "Qxd4": { "Nxd4": { "_metadata": { "eco": "B22", "name": "Sicilian Defense: Alapin Variation, Barmen Defense, Endgame Variation" } } } } } } } } } } } }, "Nc6": { "Nf3": { "cxd4": { "cxd4": { "e5": { "Nc3": { "Bb4": { "Be2": { "_metadata": { "eco": "B22", "name": "Sicilian Defense: Alapin Variation, Barmen Defense, Milner-Barry Attack" } } } } } } } } }, "Nf6": { "Nf3": { "Bg4": { "_metadata": { "eco": "B22", "name": "Sicilian Defense: Alapin Variation, Barmen Defense, Modern Line" } } } } } } } }, "Nf6": { "e5": { "Nd5": { "d4": { "cxd4": { "_metadata": { "eco": "B22", "name": "Sicilian Defense: Alapin Variation, Smith-Morra Declined" } } }, "Nf3": { "Nc6": { "Bc4": { "Nb6": { "Bb3": { "_metadata": { "eco": "B22", "name": "Sicilian Defense: Alapin Variation, Stoltz Attack" }, "c4": { "Bc2": { "Qc7": { "Qe2": { "g5": { "_metadata": { "eco": "B22", "name": "Sicilian Defense: Alapin Variation, Stoltz Attack, Ivanchuk Line" } } } } } } } } }, "Na3": { "_metadata": { "eco": "B22", "name": "Sicilian Defense: Heidenfeld Variation" } } } } } } } }, "Nf3": { "e6": { "c3": { "d5": { "exd5": { "Qxd5": { "d4": { "Nf6": { "_metadata": { "eco": "B22", "name": "Sicilian Defense: Delayed Alapin Variation" } } } } } }, "Nf6": { "e5": { "Nd5": { "d4": { "Nc6": { "_metadata": { "eco": "B40", "name": "Sicilian Defense: Alapin Variation, Sherzer Variation" } } } } } }, "_metadata": { "eco": "B40", "name": "Sicilian Defense: Delayed Alapin Variation, with e6" } }, "d4": { "a6": { "_metadata": { "eco": "B40", "name": "Sicilian Defense: Drazic Variation" } }, "cxd4": { "Nxd4": { "Nf6": { "Nc3": { "Nc6": { "_metadata": { "eco": "B40", "name": "Sicilian Defense: Four Knights Variation" }, "Nxc6": { "_metadata": { "eco": "B40", "name": "Sicilian Defense: Four Knights Variation, Exchange Variation" } } }, "Qb6": { "_metadata": { "eco": "B40", "name": "Sicilian Defense: Gaw-Paw Variation" } }, "Bb4": { "_metadata": { "eco": "B40", "name": "Sicilian Defense: Pin Variation" }, "Bd3": { "e5": { "_metadata": { "eco": "B40", "name": "Sicilian Defense: Pin Variation, Jaffe Variation" } } }, "e5": { "_metadata": { "eco": "B40", "name": "Sicilian Defense: Pin Variation, Koch Variation" } } }, "d6": { "_metadata": { "eco": "B80", "name": "Sicilian Defense: Scheveningen Variation" }, "g3": { "_metadata": { "eco": "B80", "name": "Sicilian Defense: Scheveningen Variation, Fianchetto Variation" } }, "Bb5+": { "_metadata": { "eco": "B80", "name": "Sicilian Defense: Scheveningen Variation, Vitolins Variation" } }, "g4": { "_metadata": { "eco": "B81", "name": "Sicilian Defense: Scheveningen Variation, Keres Attack" } }, "f4": { "_metadata": { "eco": "B82", "name": "Sicilian Defense: Scheveningen Variation, Matanovic Attack" }, "Nc6": { "Be3": { "Be7": { "Qf3": { "_metadata": { "eco": "B82", "name": "Sicilian Defense: Scheveningen Variation, Tal Variation" } } } } } }, "Be2": { "_metadata": { "eco": "B83", "name": "Sicilian Defense: Scheveningen Variation, Classical Variation" }, "Be7": { "O-O": { "O-O": { "f4": { "Nc6": { "Be3": { "_metadata": { "eco": "B83", "name": "Sicilian Defense: Scheveningen Variation, Modern Variation" }, "Bd7": { "Nb3": { "_metadata": { "eco": "B83", "name": "Sicilian Defense: Scheveningen Variation, Modern Variation" } } } } } } } } } }, "Bc4": { "_metadata": { "eco": "B86", "name": "Sicilian Defense: Sozin Attack" } } } }, "_metadata": { "eco": "B40", "name": "Sicilian Defense: French Variation, Normal" } }, "Qb6": { "_metadata": { "eco": "B40", "name": "Sicilian Defense: Kveinis Variation" } }, "Bc5": { "_metadata": { "eco": "B40", "name": "Sicilian Defense: Paulsen-Basman Defense" } }, "a6": { "_metadata": { "eco": "B41", "name": "Sicilian Defense: Kan Variation" }, "c4": { "Nf6": { "Nc3": { "Bb4": { "Bd3": { "Nc6": { "_metadata": { "eco": "B41", "name": "Sicilian Defense: Kan Variation, Mar\u00f3czy Bind, Bronstein Variation" }, "Bc2": { "_metadata": { "eco": "B41", "name": "Sicilian Defense: Kan Variation, Mar\u00f3czy Bind, Bronstein Variation" } } } } } } }, "g6": { "_metadata": { "eco": "B41", "name": "Sicilian Defense: Kan Variation, Mar\u00f3czy Bind, Hedgehog Variation" } }, "_metadata": { "eco": "B41", "name": "Sicilian Defense: Kan Variation, Mar\u00f3czy Bind, R\u00fcti Variation" } }, "Bd3": { "Nf6": { "O-O": { "d6": { "c4": { "g6": { "_metadata": { "eco": "B42", "name": "Sicilian Defense: Kan Variation, Gipslis Variation" } } } } } }, "_metadata": { "eco": "B42", "name": "Sicilian Defense: Kan Variation, Modern Variation" }, "Bc5": { "_metadata": { "eco": "B42", "name": "Sicilian Defense: Kan Variation, Polugaevsky Variation" } }, "g6": { "_metadata": { "eco": "B42", "name": "Sicilian Defense: Kan Variation, Swiss Cheese Variation" } } }, "Nc3": { "_metadata": { "eco": "B43", "name": "Sicilian Defense: Kan Variation, Knight Variation" }, "b5": { "_metadata": { "eco": "B43", "name": "Sicilian Defense: Kan Variation, Wing Attack" }, "Bd3": { "Qb6": { "Be3": { "Bc5": { "Qg4": { "_metadata": { "eco": "B43", "name": "Sicilian Defense: Kan Variation, Wing Attack, Christiansen's Dream" } } } }, "Nf3": { "_metadata": { "eco": "B43", "name": "Sicilian Defense: Kan Variation, Wing Attack, Spraggett Attack" } } } } } } }, "Nc6": { "_metadata": { "eco": "B44", "name": "Sicilian Defense: Taimanov Variation" }, "Nb5": { "d6": { "c4": { "Nf6": { "N1c3": { "a6": { "Na3": { "d5": { "_metadata": { "eco": "B44", "name": "Sicilian Defense: Taimanov Variation, Gary Gambit" } }, "Be7": { "Be2": { "O-O": { "O-O": { "b6": { "_metadata": { "eco": "B44", "name": "Sicilian Defense: Taimanov Variation, Modern Line" } } } } } } } } } } } }, "_metadata": { "eco": "B44", "name": "Sicilian Defense: Taimanov Variation, Sz\u00fcn Variation" } }, "Nc3": { "Nf6": { "Ndb5": { "Bb4": { "Nd6+": { "_metadata": { "eco": "B45", "name": "Sicilian Defense: Taimanov Variation, American Attack" } } } } }, "_metadata": { "eco": "B45", "name": "Sicilian Defense: Taimanov Variation, Normal Variation" }, "a6": { "_metadata": { "eco": "B46", "name": "Sicilian Defense: Taimanov Variation" } }, "Qc7": { "_metadata": { "eco": "B47", "name": "Sicilian Defense: Taimanov Variation, Bastrikov Variation" }, "Ndb5": { "Qb8": { "Be3": { "a6": { "Bb6": { "_metadata": { "eco": "B47", "name": "Sicilian Defense: Taimanov Variation, Bastrikov Variation, Ponomariov Gambit" } } } } } }, "Be3": { "_metadata": { "eco": "B48", "name": "Sicilian Defense: Taimanov Variation, Bastrikov Variation, English Attack" }, "a6": { "Be2": { "_metadata": { "eco": "B49", "name": "Sicilian Defense: Taimanov Variation, Bastrikov Variation" } } } }, "Be2": { "a6": { "O-O": { "Nf6": { "Be3": { "Be7": { "f4": { "d6": { "Qe1": { "O-O": { "_metadata": { "eco": "B85", "name": "Sicilian Defense: Scheveningen Variation, Classical Main Line" } } } } } }, "d6": { "f4": { "_metadata": { "eco": "B85", "name": "Sicilian Defense: Scheveningen Variation, Classical Variation, Paulsen Variation" } } } }, "Kh1": { "Be7": { "f4": { "d6": { "a4": { "_metadata": { "eco": "B85", "name": "Sicilian Defense: Scheveningen Variation, Classical Variation, Paulsen Variation" } } } } } } } } } } }, "d6": { "Be2": { "Nf6": { "_metadata": { "eco": "B83", "name": "Sicilian Defense: Scheveningen Variation, Modern Variation" } } } } } } }, "_metadata": { "eco": "B40", "name": "Sicilian Defense: French Variation, Open" }, "c3": { "_metadata": { "eco": "B40", "name": "Sicilian Defense: Smith-Morra Gambit Deferred" } } }, "d5": { "_metadata": { "eco": "B40", "name": "Sicilian Defense: Marshall Counterattack" } } }, "_metadata": { "eco": "B40", "name": "Sicilian Defense: French Variation" }, "b3": { "_metadata": { "eco": "B40", "name": "Sicilian Defense: French Variation, Westerinen Attack" } }, "Nc3": { "a6": { "g3": { "b5": { "d4": { "cxd4": { "Nxd4": { "_metadata": { "eco": "B40", "name": "Sicilian Defense: Kan Variation, Wing Attack, Fianchetto Variation" } } } } } } } }, "c4": { "_metadata": { "eco": "B40", "name": "Sicilian Defense: Kramnik Variation" } }, "b4": { "_metadata": { "eco": "B40", "name": "Sicilian Defense: Wing Gambit Deferred" } } }, "g6": { "d4": { "Bg7": { "Nc3": { "Qa5": { "_metadata": { "eco": "B27", "name": "Modern Defense: Pterodactyl Variation" }, "Be3": { "_metadata": { "eco": "B27", "name": "Pterodactyl Defense: Sicilian, Anhanguera" } }, "d5": { "_metadata": { "eco": "B27", "name": "Pterodactyl Defense: Sicilian, Benoni Gambit" } }, "Bd2": { "_metadata": { "eco": "B27", "name": "Pterodactyl Defense: Sicilian, Unpin" } } } }, "dxc5": { "Qa5+": { "Nc3": { "Bxc3+": { "bxc3": { "_metadata": { "eco": "B27", "name": "Pterodactyl Defense: Sicilian, Pteranodon" }, "Qxc3+": { "_metadata": { "eco": "B27", "name": "Sicilian Defense: Hyperaccelerated Pterodactyl, Exchange Variation" } } } }, "_metadata": { "eco": "B27", "name": "Pterodactyl Defense: Sicilian, Rhamphorhynchus" } }, "_metadata": { "eco": "B27", "name": "Pterodactyl Defense: Western, Rhamphorhynchus" } } }, "_metadata": { "eco": "B27", "name": "Sicilian Defense: Hyperaccelerated Pterodactyl" } }, "f5": { "_metadata": { "eco": "B27", "name": "Sicilian Defense: Frederico Variation" } }, "_metadata": { "eco": "B27", "name": "Sicilian Defense: Hyperaccelerated Fianchetto" }, "cxd4": { "Nxd4": { "Nf6": { "Nc3": { "d6": { "Be2": { "Bg7": { "O-O": { "O-O": { "Be3": { "Nc6": { "Nb3": { "Be6": { "f4": { "Na5": { "1f5": { "Bc4": { "1Bd3": { "Bxd3": { "1cxd3": { "d5": { "_metadata": { "eco": "B74", "name": "Sicilian Defense: Dragon Variation, Classical Variation, Bernard Defense" } } } } } } } } } } } } } } } } } } } } } } }, "c3": { "Bg7": { "d4": { "Qa5": { "_metadata": { "eco": "B27", "name": "Pterodactyl Defense: Western, Pterodactyl" } } } } }, "c4": { "Bh6": { "_metadata": { "eco": "B27", "name": "Sicilian Defense: Acton Extension" } } }, "_metadata": { "eco": "B27", "name": "Sicilian Defense: Hyperaccelerated Dragon" } }, "_metadata": { "eco": "B27", "name": "Sicilian Defense" }, "f5": { "_metadata": { "eco": "B27", "name": "Sicilian Defense: Brussels Gambit" }, "exf5": { "Nh6": { "_metadata": { "eco": "B27", "name": "Sicilian Defense: Double-Dutch Gambit" } } } }, "h6": { "_metadata": { "eco": "B27", "name": "Sicilian Defense: B\u00fccker Variation" } }, "e5": { "_metadata": { "eco": "B27", "name": "Sicilian Defense: Jalalabad Variation" } }, "b6": { "_metadata": { "eco": "B27", "name": "Sicilian Defense: Katalimov Variation" } }, "Qa5": { "_metadata": { "eco": "B27", "name": "Sicilian Defense: Mongoose Variation" } }, "b5": { "_metadata": { "eco": "B27", "name": "Sicilian Defense: Polish Gambit" } }, "Qc7": { "_metadata": { "eco": "B27", "name": "Sicilian Defense: Quinteros Variation" } }, "a6": { "_metadata": { "eco": "B28", "name": "Sicilian Defense: O'Kelly Variation" }, "Be2": { "_metadata": { "eco": "B28", "name": "Sicilian Defense: O'Kelly Variation, Aronin System" } }, "b3": { "_metadata": { "eco": "B28", "name": "Sicilian Defense: O'Kelly Variation, Kieseritzky System" } }, "c4": { "_metadata": { "eco": "B28", "name": "Sicilian Defense: O'Kelly Variation, Mar\u00f3czy Bind" }, "e6": { "_metadata": { "eco": "B28", "name": "Sicilian Defense: O'Kelly Variation, Mar\u00f3czy Bind, Paulsen Line" } }, "d6": { "_metadata": { "eco": "B28", "name": "Sicilian Defense: O'Kelly Variation, Mar\u00f3czy Bind, Robatsch Line" } } }, "d4": { "_metadata": { "eco": "B28", "name": "Sicilian Defense: O'Kelly Variation, Normal System" }, "cxd4": { "Bc4": { "_metadata": { "eco": "B28", "name": "Sicilian Defense: O'Kelly Variation, Normal System, Cortlever Gambit" } }, "c3": { "_metadata": { "eco": "B28", "name": "Sicilian Defense: O'Kelly Variation, Normal System, Smith-Morra Line" } }, "Nxd4": { "e5": { "_metadata": { "eco": "B28", "name": "Sicilian Defense: O'Kelly Variation, Normal System, Taimanov Line" } } }, "Qxd4": { "_metadata": { "eco": "B28", "name": "Sicilian Defense: O'Kelly Variation, Normal System, Zagorovsky Line" } } } }, "d3": { "_metadata": { "eco": "B28", "name": "Sicilian Defense: O'Kelly Variation, Quiet System" } }, "g3": { "_metadata": { "eco": "B28", "name": "Sicilian Defense: O'Kelly Variation, R\u00fcti System" } }, "c3": { "_metadata": { "eco": "B28", "name": "Sicilian Defense: O'Kelly Variation, Venice System" }, "Nf6": { "_metadata": { "eco": "B28", "name": "Sicilian Defense: O'Kelly Variation, Venice System, Barcza Line" } }, "d5": { "exd5": { "Nf6": { "_metadata": { "eco": "B28", "name": "Sicilian Defense: O'Kelly Variation, Venice System, Gambit Line" } } } }, "b5": { "_metadata": { "eco": "B28", "name": "Sicilian Defense: O'Kelly Variation, Venice System, Ljubojevic Line" } }, "d6": { "_metadata": { "eco": "B28", "name": "Sicilian Defense: O'Kelly Variation, Venice System, Steiner Line" } } }, "b4": { "_metadata": { "eco": "B28", "name": "Sicilian Defense: O'Kelly Variation, Wing Gambit" } }, "Nc3": { "_metadata": { "eco": "B28", "name": "Sicilian Defense: O'Kelly Variation, Yerevan System" } } }, "Nf6": { "_metadata": { "eco": "B29", "name": "Sicilian Defense: Nimzowitsch Variation" }, "e5": { "_metadata": { "eco": "B29", "name": "Sicilian Defense: Nimzowitsch Variation, Advance Variation" }, "Nd5": { "Nc3": { "Nxc3": { "_metadata": { "eco": "B29", "name": "Sicilian Defense: Nimzowitsch Variation, Exchange Variation" } }, "e6": { "Nxd5": { "exd5": { "d4": { "Nc6": { "_metadata": { "eco": "B29", "name": "Sicilian Defense: Nimzowitsch Variation, Main Line" } } } } } } } } }, "Nc3": { "_metadata": { "eco": "B29", "name": "Sicilian Defense: Nimzowitsch Variation, Closed Variation" }, "d6": { "d4": { "cxd4": { "Nxd4": { "a6": { "Be2": { "e5": { "Nb3": { "Be6": { "Be3": { "_metadata": { "eco": "B92", "name": "Sicilian Defense: Najdorf Variation, Opocensky Variation" } } } } } } } } } } } } }, "Nc6": { "Nc3": { "e5": { "Bc4": { "Be7": { "d3": { "d6": { "Nd2": { "Bg5": { "_metadata": { "eco": "B30", "name": "Sicilian Defense: Closed, Anti-Sveshnikov Variation, Kharlov-Kramnik Line" } } }, "_metadata": { "eco": "B30", "name": "Sicilian Defense: Closed, Anti-Sveshnikov Variation, with d6" } }, "Nf6": { "_metadata": { "eco": "B30", "name": "Sicilian Defense: Closed, Anti-Sveshnikov Variation, with Nf6" } } } } } } }, "Bb5": { "_metadata": { "eco": "B30", "name": "Sicilian Defense: Nyezhmetdinov-Rossolimo Attack" }, "Nb8": { "_metadata": { "eco": "B30", "name": "Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Brooklyn Retreat Defense" } }, "Na5": { "b4": { "_metadata": { "eco": "B30", "name": "Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, San Francisco Gambit" } } }, "g6": { "_metadata": { "eco": "B31", "name": "Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation" }, "O-O": { "Bg7": { "c3": { "e5": { "d4": { "_metadata": { "eco": "B31", "name": "Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation, Gufeld Gambit" } } }, "Nf6": { "d4": { "_metadata": { "eco": "B31", "name": "Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation, Lutikov Gambit" } }, "Qa4": { "_metadata": { "eco": "B31", "name": "Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation, Totsky Attack" } } } }, "Re1": { "e5": { "b4": { "_metadata": { "eco": "B31", "name": "Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Gurgenidze Variation" } } } } } } } }, "_metadata": { "eco": "B30", "name": "Sicilian Defense: Old Sicilian" }, "b4": { "_metadata": { "eco": "B30", "name": "Sicilian Defense: Portsmouth Gambit" } }, "d4": { "cxd4": { "Nxd4": { "g6": { "_metadata": { "eco": "B32", "name": "Sicilian Defense: Accelerated Dragon" }, "Nxc6": { "_metadata": { "eco": "B34", "name": "Sicilian Defense: Accelerated Dragon, Exchange Variation" } }, "Nc3": { "_metadata": { "eco": "B34", "name": "Sicilian Defense: Accelerated Dragon, Modern Variation" }, "Bg7": { "Be3": { "Nf6": { "Bc4": { "_metadata": { "eco": "B35", "name": "Sicilian Defense: Accelerated Dragon, Modern Bc4 Variation" }, "d6": { "_metadata": { "eco": "B35", "name": "Sicilian Defense: Dragon Variation, Modern Bc4 Variation" } } }, "Be2": { "O-O": { "O-O": { "d6": { "Nb3": { "a5": { "_metadata": { "eco": "B74", "name": "Sicilian Defense: Dragon Variation, Classical Variation, Alekhine Line" } } } } }, "Nb3": { "d6": { "O-O": { "Be6": { "f4": { "Na5": { "1f5": { "Bc4": { "1Bd3": { "_metadata": { "eco": "B74", "name": "Sicilian Defense: Dragon Variation, Classical Variation, Spielmann Variation" } } } } } } } } } } } } } } } }, "c4": { "_metadata": { "eco": "B36", "name": "Sicilian Defense: Accelerated Dragon, Mar\u00f3czy Bind" }, "Nf6": { "Nc3": { "Nxd4": { "Qxd4": { "d6": { "_metadata": { "eco": "B36", "name": "Sicilian Defense: Accelerated Dragon, Mar\u00f3czy Bind, Gurgenidze Variation" } } } } } }, "Bg7": { "_metadata": { "eco": "B37", "name": "Sicilian Defense: Accelerated Dragon, Mar\u00f3czy Bind" }, "Nc2": { "d6": { "Be2": { "Nh6": { "_metadata": { "eco": "B37", "name": "Sicilian Defense: Accelerated Dragon, Simagin Variation" } } } } }, "Be3": { "_metadata": { "eco": "B38", "name": "Sicilian Defense: Accelerated Dragon, Mar\u00f3czy Bind" }, "Nf6": { "Nc3": { "Ng4": { "_metadata": { "eco": "B39", "name": "Sicilian Defense: Accelerated Dragon, Mar\u00f3czy Bind, Breyer Variation" } } } } } } }, "Be3": { "Bg7": { "Be2": { "Nf6": { "Nc3": { "O-O": { "O-O": { "d6": { "f4": { "Qb6": { "e5": { "_metadata": { "eco": "B73", "name": "Sicilian Defense: Dragon Variation, Classical Variation, Zollner Gambit" } } } } } } } } } } } } }, "Qc7": { "_metadata": { "eco": "B32", "name": "Sicilian Defense: Flohr Variation" } }, "Qb6": { "_metadata": { "eco": "B32", "name": "Sicilian Defense: Godiva Variation" } }, "e5": { "Nb5": { "d6": { "_metadata": { "eco": "B32", "name": "Sicilian Defense: Kalashnikov Variation" } } }, "_metadata": { "eco": "B32", "name": "Sicilian Defense: L\u00f6wenthal Variation" } }, "d5": { "_metadata": { "eco": "B32", "name": "Sicilian Defense: Nimzo-American Variation" } }, "a6": { "c4": { "e5": { "_metadata": { "eco": "B32", "name": "Sicilian Defense: O'Kelly Variation, Mar\u00f3czy Bind, Geller Line" } } } }, "_metadata": { "eco": "B32", "name": "Sicilian Defense: Open" }, "Nf6": { "Nc3": { "e6": { "Ndb5": { "Bc5": { "_metadata": { "eco": "B33", "name": "Sicilian Defense: Four Knights Variation, Cobra Variation" } } } }, "e5": { "_metadata": { "eco": "B33", "name": "Sicilian Defense: Lasker-Pelikan Variation" }, "Ndb5": { "d6": { "Bg5": { "a6": { "Na3": { "Be6": { "_metadata": { "eco": "B33", "name": "Sicilian Defense: Lasker-Pelikan Variation, Bird Variation" } }, "b5": { "_metadata": { "eco": "B33", "name": "Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation" }, "Bxf6": { "gxf6": { "Nd5": { "f5": { "_metadata": { "eco": "B33", "name": "Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation" }, "1Bxb5": { "_metadata": { "eco": "B33", "name": "Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Peresypkin's Sacrifice" } } }, "Bg7": { "_metadata": { "eco": "B33", "name": "Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Novosibirsk Variation" } } } } }, "Nd5": { "_metadata": { "eco": "B33", "name": "Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Chelyabinsk Variation" } } } } } } } }, "Nxc6": { "_metadata": { "eco": "B33", "name": "Sicilian Defense: Lasker-Pelikan Variation, Exchange Variation" } }, "Nf3": { "_metadata": { "eco": "B33", "name": "Sicilian Defense: Lasker-Pelikan Variation, Retreat Variation" } }, "Nb3": { "_metadata": { "eco": "B33", "name": "Sicilian Defense: Lasker-Pelikan Variation, Schlechter Variation" } } }, "d6": { "Nde2": { "_metadata": { "eco": "B56", "name": "Sicilian Defense: Spielmann Variation" } }, "Bd3": { "_metadata": { "eco": "B56", "name": "Sicilian Defense: Yates Variation" } }, "Bc4": { "Qb6": { "_metadata": { "eco": "B57", "name": "Sicilian Defense: Classical Variation, Anti-Sozin Variation" } }, "g6": { "Nxc6": { "bxc6": { "e5": { "_metadata": { "eco": "B57", "name": "Sicilian Defense: Magnus Smith Trap" } } } } }, "e6": { "Bb3": { "Be7": { "Be3": { "O-O": { "f4": { "_metadata": { "eco": "B88", "name": "Sicilian Defense: Sozin Attack, Fischer Variation" } } } } } }, "_metadata": { "eco": "B88", "name": "Sicilian Defense: Sozin Attack, Leonhardt Variation" }, "Be3": { "_metadata": { "eco": "B89", "name": "Sicilian Defense: Sozin Attack, Main Line" }, "Be7": { "Qe2": { "_metadata": { "eco": "B89", "name": "Sicilian Defense: Velimirovic Attack" } } } } } }, "Be2": { "e5": { "Nxc6": { "_metadata": { "eco": "B58", "name": "Sicilian Defense: Boleslavsky Variation, Louma Variation" } }, "Nb3": { "_metadata": { "eco": "B59", "name": "Sicilian Defense: Boleslavsky Variation" } } }, "g6": { "Be3": { "Bg7": { "Qd2": { "_metadata": { "eco": "B72", "name": "Sicilian Defense: Dragon Variation, Classical Variation, Amsterdam Variation" }, "O-O": { "O-O-O": { "_metadata": { "eco": "B72", "name": "Sicilian Defense: Dragon Variation, Classical Variation, Grigoriev Variation" } } } } } } } }, "Bg5": { "g6": { "_metadata": { "eco": "B60", "name": "Sicilian Defense: Richter-Rauzer Variation, Dragon Variation" } }, "Bd7": { "Qd2": { "_metadata": { "eco": "B61", "name": "Sicilian Defense: Richter-Rauzer Variation, Modern Variation" } } }, "e6": { "Nb3": { "_metadata": { "eco": "B62", "name": "Sicilian Defense: Richter-Rauzer Variation, Podebrady Variation" } }, "Qd2": { "Be7": { "O-O-O": { "O-O": { "f4": { "e5": { "_metadata": { "eco": "B64", "name": "Sicilian Defense: Richter-Rauzer Variation, Classical Variation" } } } } } }, "a6": { "O-O-O": { "Bd7": { "_metadata": { "eco": "B67", "name": "Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation" }, "f4": { "Be7": { "_metadata": { "eco": "B68", "name": "Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation" }, "Nf3": { "b5": { "1Bxf6": { "_metadata": { "eco": "B69", "name": "Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation, Nyezhmetdinov Attack" } } } } } } } } } } } } } }, "_metadata": { "eco": "B33", "name": "Sicilian Defense: Open" } } }, "_metadata": { "eco": "B32", "name": "Sicilian Defense: Open" } }, "e6": { "_metadata": { "eco": "B32", "name": "Sicilian Defense: Franco-Sicilian Variation" } }, "_metadata": { "eco": "B32", "name": "Sicilian Defense: Open" } } }, "d6": { "d4": { "_metadata": { "eco": "B50", "name": "Sicilian Defense" }, "cxd4": { "_metadata": { "eco": "B50", "name": "Sicilian Defense" }, "c3": { "_metadata": { "eco": "B50", "name": "Sicilian Defense: Modern Variations, Tartakower" } }, "Qxd4": { "_metadata": { "eco": "B53", "name": "Sicilian Defense: Chekhover Variation" }, "Nc6": { "Bb5": { "Qd7": { "_metadata": { "eco": "B53", "name": "Sicilian Defense: Chekhover Variation, Zaitsev Defense" } } } } }, "Nxd4": { "g6": { "_metadata": { "eco": "B54", "name": "Sicilian Defense: Dragon Variation, Accelerated Dragon" } }, "Nf6": { "Bc4": { "_metadata": { "eco": "B54", "name": "Sicilian Defense: Modern Variations, Ginsberg Gambit" } }, "_metadata": { "eco": "B54", "name": "Sicilian Defense: Modern Variations, Main Line" }, "f3": { "_metadata": { "eco": "B54", "name": "Sicilian Defense: Prins Variation" }, "e5": { "Bb5+": { "_metadata": { "eco": "B55", "name": "Sicilian Defense: Prins Variation, Venice Attack" } } } }, "Nc3": { "Nc6": { "_metadata": { "eco": "B56", "name": "Sicilian Defense: Classical Variation" }, "g3": { "_metadata": { "eco": "B56", "name": "Sicilian Defense: Classical Variation, Fianchetto Variation" } }, "Bc4": { "_metadata": { "eco": "B57", "name": "Sicilian Defense: Classical Variation, Sozin Attack" }, "e6": { "Be3": { "Be7": { "Bb3": { "O-O": { "O-O": { "Na5": { "f4": { "b6": { "_metadata": { "eco": "B89", "name": "Sicilian Defense: Sozin Attack, Main Line, Sherbakov Variation" } } } } } } } } } } }, "Be2": { "e5": { "_metadata": { "eco": "B58", "name": "Sicilian Defense: Boleslavsky Variation" } }, "_metadata": { "eco": "B58", "name": "Sicilian Defense: Classical Variation" }, "Nxd4": { "Qxd4": { "g6": { "_metadata": { "eco": "B58", "name": "Sicilian Defense: Classical Variation, Dragon Transfer" } } } } }, "Bg5": { "_metadata": { "eco": "B60", "name": "Sicilian Defense: Richter-Rauzer Variation" }, "Bd7": { "_metadata": { "eco": "B60", "name": "Sicilian Defense: Richter-Rauzer Variation, Modern Variation" } }, "e6": { "_metadata": { "eco": "B62", "name": "Sicilian Defense: Richter-Rauzer Variation" }, "Qd3": { "_metadata": { "eco": "B62", "name": "Sicilian Defense: Richter-Rauzer Variation" } }, "Nxc6": { "_metadata": { "eco": "B62", "name": "Sicilian Defense: Richter-Rauzer Variation, Exchange Variation" } }, "Bb5": { "_metadata": { "eco": "B62", "name": "Sicilian Defense: Richter-Rauzer Variation, Vitolins Variation" } }, "Qd2": { "Be7": { "_metadata": { "eco": "B63", "name": "Sicilian Defense: Richter-Rauzer Variation, Classical Variation" }, "O-O-O": { "Nxd4": { "Qxd4": { "a6": { "f4": { "b5": { "_metadata": { "eco": "B63", "name": "Sicilian Defense: Richter-Rauzer Variation, Classical Variation, Kantscher Line" } } } } } }, "O-O": { "f4": { "_metadata": { "eco": "B64", "name": "Sicilian Defense: Richter-Rauzer Variation, Classical Variation" }, "Nxd4": { "Qxd4": { "_metadata": { "eco": "B65", "name": "Sicilian Defense: Richter-Rauzer Variation, Classical Variation" } }, "_metadata": { "eco": "B65", "name": "Sicilian Defense: Richter-Rauzer Variation, Rauzer Attack" } } } } } }, "Qb6": { "_metadata": { "eco": "B63", "name": "Sicilian Defense: Richter-Rauzer Variation, Ivanov Variation" } }, "_metadata": { "eco": "B63", "name": "Sicilian Defense: Richter-Rauzer Variation, Traditional Variation" }, "a6": { "_metadata": { "eco": "B66", "name": "Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation, Early Deviations" } } } } } }, "Bd7": { "_metadata": { "eco": "B56", "name": "Sicilian Defense: Kupreichik Variation" } }, "e5": { "Bb5+": { "_metadata": { "eco": "B56", "name": "Sicilian Defense: Venice Attack" } } }, "g6": { "_metadata": { "eco": "B70", "name": "Sicilian Defense: Dragon Variation" }, "Be2": { "_metadata": { "eco": "B70", "name": "Sicilian Defense: Dragon Variation, Classical Variation" }, "Bg7": { "O-O": { "Nc6": { "Be3": { "_metadata": { "eco": "B73", "name": "Sicilian Defense: Dragon Variation, Classical Variation" } } }, "O-O": { "Be3": { "Nc6": { "Qd2": { "_metadata": { "eco": "B73", "name": "Sicilian Defense: Dragon Variation, Classical Variation, Battery Variation" } }, "Nb3": { "Be6": { "f4": { "Na5": { "_metadata": { "eco": "B74", "name": "Sicilian Defense: Dragon Variation, Classical Variation, Mar\u00f3czy Line" } }, "Qc8": { "_metadata": { "eco": "B74", "name": "Sicilian Defense: Dragon Variation, Classical Variation, Tartakower Line" } } } }, "_metadata": { "eco": "B74", "name": "Sicilian Defense: Dragon Variation, Classical Variation, Normal Line" } } } } } } } }, "g3": { "_metadata": { "eco": "B70", "name": "Sicilian Defense: Dragon Variation, Fianchetto Variation" } }, "f4": { "_metadata": { "eco": "B71", "name": "Sicilian Defense: Dragon Variation, Levenfish Variation" }, "Nbd7": { "_metadata": { "eco": "B71", "name": "Sicilian Defense: Dragon Variation, Levenfish Variation, Main Line" } } }, "Be3": { "_metadata": { "eco": "B72", "name": "Sicilian Defense: Dragon Variation" }, "Bg7": { "Be2": { "_metadata": { "eco": "B72", "name": "Sicilian Defense: Dragon Variation, Classical Variation" }, "Nc6": { "_metadata": { "eco": "B72", "name": "Sicilian Defense: Dragon Variation, Classical Variation" }, "Nb3": { "_metadata": { "eco": "B72", "name": "Sicilian Defense: Dragon Variation, Classical Variation" } } } }, "f3": { "Nc6": { "_metadata": { "eco": "B75", "name": "Sicilian Defense: Dragon Variation, Yugoslav Attack, Belezky Line" }, "Qd2": { "O-O": { "O-O-O": { "_metadata": { "eco": "B76", "name": "Sicilian Defense: Dragon Variation, Yugoslav Attack, Modern Line" } }, "Bc4": { "Nxd4": { "Bxd4": { "Be6": { "_metadata": { "eco": "B77", "name": "Sicilian Defense: Dragon Variation, Yugoslav Attack, Czerniak Variation" } } } }, "Nd7": { "_metadata": { "eco": "B77", "name": "Sicilian Defense: Dragon Variation, Yugoslav Attack, Sosonko Variation" } } } } } }, "_metadata": { "eco": "B75", "name": "Sicilian Defense: Dragon Variation, Yugoslav Attack, Early Deviations" }, "O-O": { "_metadata": { "eco": "B76", "name": "Sicilian Defense: Dragon Variation, Yugoslav Attack" }, "Qd2": { "Nc6": { "_metadata": { "eco": "B76", "name": "Sicilian Defense: Dragon Variation, Yugoslav Attack" }, "g4": { "_metadata": { "eco": "B76", "name": "Sicilian Defense: Dragon Variation, Yugoslav Attack, Panov Variation" } }, "Bc4": { "Bd7": { "_metadata": { "eco": "B77", "name": "Sicilian Defense: Dragon Variation, Yugoslav Attack" }, "O-O-O": { "_metadata": { "eco": "B78", "name": "Sicilian Defense: Dragon Variation, Yugoslav Attack" }, "Rc8": { "_metadata": { "eco": "B78", "name": "Sicilian Defense: Dragon Variation, Yugoslav Attack, Old Line" } }, "Qa5": { "1h4": { "Rfc8": { "1Bb3": { "h5": { "_metadata": { "eco": "B79", "name": "Sicilian Defense: Dragon Variation, Yugoslav Attack, Soltis Variation" } } } } } } }, "h4": { "Qa5": { "1O-O-O": { "Rfc8": { "1Bb3": { "_metadata": { "eco": "B79", "name": "Sicilian Defense: Dragon Variation, Yugoslav Attack" } } } } } } }, "a5": { "_metadata": { "eco": "B77", "name": "Sicilian Defense: Dragon Variation, Yugoslav Attack, Byrne Variation" } }, "_metadata": { "eco": "B77", "name": "Sicilian Defense: Dragon Variation, Yugoslav Attack, Main Line" } } } } } } } } }, "a6": { "Be3": { "e6": { "Qd2": { "_metadata": { "eco": "B80", "name": "Sicilian Defense: Scheveningen Variation, English Attack, with Qd2" } }, "g4": { "_metadata": { "eco": "B90", "name": "Sicilian Defense: Scheveningen Variation, Delayed Keres Attack" }, "e5": { "Nf5": { "g6": { "g5": { "_metadata": { "eco": "B90", "name": "Sicilian Defense: Scheveningen Variation, Delayed Keres Attack, Perenyi Gambit" } } } } } }, "f3": { "_metadata": { "eco": "B90", "name": "Sicilian Defense: Scheveningen Variation, English Attack, with f3" } } }, "_metadata": { "eco": "B90", "name": "Sicilian Defense: Najdorf Variation, English Attack" }, "Ng4": { "_metadata": { "eco": "B90", "name": "Sicilian Defense: Najdorf Variation, English Attack, Anti-English" } } }, "Be2": { "e6": { "O-O": { "Nbd7": { "_metadata": { "eco": "B84", "name": "Sicilian Defense: Najdorf Variation, Scheveningen Variation" } }, "Qc7": { "_metadata": { "eco": "B84", "name": "Sicilian Defense: Scheveningen Variation, Classical Variation" } } }, "_metadata": { "eco": "B84", "name": "Sicilian Defense: Scheveningen Variation, Classical Variation" } }, "_metadata": { "eco": "B92", "name": "Sicilian Defense: Najdorf Variation, Opocensky Variation" }, "e5": { "Nb3": { "Be7": { "O-O": { "Be6": { "_metadata": { "eco": "B92", "name": "Sicilian Defense: Najdorf Variation, Opocensky Variation, Modern Line" } }, "O-O": { "_metadata": { "eco": "B92", "name": "Sicilian Defense: Najdorf Variation, Opocensky Variation, Traditional Line" } } } } } } }, "f4": { "e6": { "Be2": { "Qc7": { "O-O": { "Nc6": { "_metadata": { "eco": "B85", "name": "Sicilian Defense: Scheveningen Variation, Classical Variation, Paulsen Variation" } } } } } }, "_metadata": { "eco": "B93", "name": "Sicilian Defense: Najdorf Variation, Amsterdam Variation" } }, "Bc4": { "e6": { "Bb3": { "b5": { "_metadata": { "eco": "B87", "name": "Sicilian Defense: Sozin Attack, Flank Variation" } } } }, "_metadata": { "eco": "B90", "name": "Sicilian Defense: Najdorf Variation, Lipnitsky Attack" } }, "_metadata": { "eco": "B90", "name": "Sicilian Defense: Najdorf Variation" }, "h3": { "_metadata": { "eco": "B90", "name": "Sicilian Defense: Najdorf Variation, Adams Attack" } }, "g4": { "_metadata": { "eco": "B90", "name": "Sicilian Defense: Najdorf Variation, Dekker Gambit" } }, "Rg1": { "_metadata": { "eco": "B90", "name": "Sicilian Defense: Najdorf Variation, Freak Attack" } }, "g3": { "_metadata": { "eco": "B91", "name": "Sicilian Defense: Najdorf Variation, Zagreb Variation" } }, "Bg5": { "_metadata": { "eco": "B94", "name": "Sicilian Defense: Najdorf Variation" }, "Nbd7": { "Bc4": { "Qa5": { "Qd2": { "e6": { "O-O-O": { "b5": { "Bb3": { "Bb7": { "1Rhe1": { "Nc5": { "1e5": { "_metadata": { "eco": "B94", "name": "Sicilian Defense: Najdorf Variation, Ivkov Variation" } } } } } } } } } } } } }, "e6": { "_metadata": { "eco": "B95", "name": "Sicilian Defense: Najdorf Variation" }, "f4": { "_metadata": { "eco": "B96", "name": "Sicilian Defense: Najdorf Variation" }, "Nc6": { "_metadata": { "eco": "B96", "name": "Sicilian Defense: Najdorf Variation, Neo-Classical Defense" } }, "b5": { "_metadata": { "eco": "B96", "name": "Sicilian Defense: Najdorf Variation, Polugaevsky Variation" }, "e5": { "dxe5": { "fxe5": { "Qc7": { "Qe2": { "_metadata": { "eco": "B96", "name": "Sicilian Defense: Najdorf Variation, Polugaevsky Variation, Simagin Line" } } } } } } }, "Qb6": { "Qd2": { "Qxb2": { "Rb1": { "Qa3": { "_metadata": { "eco": "B97", "name": "Sicilian Defense: Najdorf Variation, Poisoned Pawn Accepted" } } } } }, "_metadata": { "eco": "B97", "name": "Sicilian Defense: Najdorf Variation, Poisoned Pawn Variation" } }, "Be7": { "_metadata": { "eco": "B98", "name": "Sicilian Defense: Najdorf Variation" }, "Qf3": { "h6": { "Bh4": { "Qc7": { "_metadata": { "eco": "B98", "name": "Sicilian Defense: Najdorf Variation, Browne Variation" } }, "g5": { "_metadata": { "eco": "B98", "name": "Sicilian Defense: Najdorf Variation, Goteborg Variation" } } } }, "Qc7": { "_metadata": { "eco": "B98", "name": "Sicilian Defense: Najdorf Variation, Traditional Line" }, "O-O-O": { "Nbd7": { "_metadata": { "eco": "B99", "name": "Sicilian Defense: Najdorf Variation, Main Line" } } } } } } } } } } } } } }, "Nf6": { "_metadata": { "eco": "B50", "name": "Sicilian Defense: Modern Variations, Anti-Qxd4 Move Order" }, "dxc5": { "Nxe4": { "_metadata": { "eco": "B50", "name": "Sicilian Defense: Modern Variations, Anti-Qxd4 Move Order Accepted" } } } } }, "c3": { "Nf6": { "Be2": { "Nc6": { "d4": { "cxd4": { "cxd4": { "Nxe4": { "d5": { "Qa5+": { "Nc3": { "Nxc3": { "bxc3": { "_metadata": { "eco": "B50", "name": "Sicilian Defense: Delayed Alapin Variation, Basman-Palatnik Double Gambit" } } } } } }, "_metadata": { "eco": "B50", "name": "Sicilian Defense: Delayed Alapin Variation, Basman-Palatnik Gambit" } } } } } } } }, "_metadata": { "eco": "B50", "name": "Sicilian Defense: Delayed Alapin Variation, with d6" } }, "Bd3": { "_metadata": { "eco": "B50", "name": "Sicilian Defense: Kopec System" } }, "g3": { "b5": { "_metadata": { "eco": "B50", "name": "Sicilian Defense: Kotov Gambit" } } }, "_metadata": { "eco": "B50", "name": "Sicilian Defense: Modern Variations" }, "b4": { "_metadata": { "eco": "B50", "name": "Sicilian Defense: Wing Gambit, Deferred Variation" } }, "Bb5+": { "_metadata": { "eco": "B51", "name": "Sicilian Defense: Moscow Variation" }, "Nc6": { "O-O": { "Bd7": { "Qe2": { "g6": { "e5": { "_metadata": { "eco": "B51", "name": "Sicilian Defense: Moscow Variation, Dorfman Gambit" } } } }, "c3": { "Nf6": { "Re1": { "a6": { "Bxc6": { "Bxc6": { "d4": { "Bxe4": { "Bg5": { "_metadata": { "eco": "B51", "name": "Sicilian Defense: Moscow Variation, Moscow Gambit" } } } } } } } } } } } } }, "Bd7": { "Bxd7+": { "Qxd7": { "O-O": { "Nc6": { "c3": { "Nf6": { "d4": { "_metadata": { "eco": "B52", "name": "Sicilian Defense: Moscow Variation, Haag Gambit" } } } } } }, "c4": { "_metadata": { "eco": "B52", "name": "Sicilian Defense: Moscow Variation, Sokolsky Variation" } } } }, "_metadata": { "eco": "B52", "name": "Sicilian Defense: Moscow Variation, Main Line" } } } } }, "Nc3": { "_metadata": { "eco": "B23", "name": "Sicilian Defense: Closed" }, "e6": { "_metadata": { "eco": "B23", "name": "Sicilian Defense: Closed" }, "g3": { "_metadata": { "eco": "B23", "name": "Sicilian Defense: Closed" }, "d5": { "_metadata": { "eco": "B23", "name": "Sicilian Defense: Closed, Korchnoi Defense" } } } }, "Nc6": { "Nge2": { "_metadata": { "eco": "B23", "name": "Sicilian Defense: Closed, Chameleon Variation" } }, "g4": { "_metadata": { "eco": "B23", "name": "Sicilian Defense: Closed, Grob Attack" } }, "_metadata": { "eco": "B23", "name": "Sicilian Defense: Closed, Traditional" }, "f4": { "_metadata": { "eco": "B23", "name": "Sicilian Defense: Grand Prix Attack" }, "g6": { "Nf3": { "Bg7": { "Bc4": { "e6": { "f5": { "_metadata": { "eco": "B23", "name": "Sicilian Defense: Grand Prix Attack, Schofman Variation" } } } } } } } }, "g3": { "g6": { "_metadata": { "eco": "B24", "name": "Sicilian Defense: Closed" }, "Bg2": { "Bg7": { "_metadata": { "eco": "B24", "name": "Sicilian Defense: Closed" }, "d3": { "e6": { "Be3": { "Nd4": { "Nce2": { "_metadata": { "eco": "B24", "name": "Sicilian Defense: Closed, Smyslov Variation" } } } } }, "d6": { "_metadata": { "eco": "B25", "name": "Sicilian Defense: Closed" }, "f4": { "_metadata": { "eco": "B25", "name": "Sicilian Defense: Closed" }, "e5": { "Nh3": { "Nge7": { "_metadata": { "eco": "B25", "name": "Sicilian Defense: Closed, Botvinnik Defense, Edge Variation" } } }, "_metadata": { "eco": "B25", "name": "Sicilian Defense: Closed, Botvinnik Defense, with f4" } } }, "Nge2": { "e5": { "_metadata": { "eco": "B25", "name": "Sicilian Defense: Closed, Botvinnik Defense, with Nge2" } } }, "Be3": { "_metadata": { "eco": "B26", "name": "Sicilian Defense: Closed" } } } } } } }, "_metadata": { "eco": "B24", "name": "Sicilian Defense: Closed, Fianchetto Variation" } } }, "d6": { "f4": { "Nc6": { "Nf3": { "g6": { "d4": { "cxd4": { "Nxd4": { "Bg7": { "Be3": { "Nf6": { "Be2": { "O-O": { "Nb3": { "Be6": { "O-O": { "Na5": { "1f5": { "Bc4": { "1Nxa5": { "Bxe2": { "1Qxe2": { "Qxa5": { "1g4": { "_metadata": { "eco": "B74", "name": "Sicilian Defense: Dragon Variation, Classical Variation, Stockholm Attack" } } } } } } } } } } } } } } } } } } } } } } } } } } }, "e5": { "Ke2": { "_metadata": { "eco": "C20", "name": "Bongcloud Attack" } }, "d4": { "_metadata": { "eco": "C20", "name": "Center Game" }, "d5": { "_metadata": { "eco": "C20", "name": "King's Pawn Game: Beyer Gambit" } }, "d6": { "dxe5": { "Bd7": { "_metadata": { "eco": "C20", "name": "King's Pawn Game: Philidor Gambit" } } } }, "exd4": { "Qxd4": { "_metadata": { "eco": "C21", "name": "Center Game" }, "Nc6": { "Qe3": { "Nf6": { "_metadata": { "eco": "C22", "name": "Center Game: Berger Variation" }, "Nc3": { "Bb4": { "Bd2": { "O-O": { "O-O-O": { "Re8": { "Bc4": { "d6": { "Nh3": { "_metadata": { "eco": "C22", "name": "Center Game: Kupreichik Variation" } } } } } } } } } } }, "Bb4+": { "c3": { "Be7": { "_metadata": { "eco": "C22", "name": "Center Game: Charousek Variation" } } } }, "_metadata": { "eco": "C22", "name": "Center Game: Paulsen Attack Variation" }, "f5": { "_metadata": { "eco": "C22", "name": "Center Game: l'Hermet Variation" } } }, "Qc4": { "_metadata": { "eco": "C22", "name": "Center Game: Hall Variation" } }, "_metadata": { "eco": "C22", "name": "Center Game: Normal Variation" } } }, "_metadata": { "eco": "C21", "name": "Center Game Accepted" }, "f4": { "_metadata": { "eco": "C21", "name": "Center Game: Halasz-McDonnell Gambit" }, "Bc5": { "Nf3": { "Nc6": { "c3": { "_metadata": { "eco": "C21", "name": "Center Game: Halasz-McDonnell Gambit, Crocodile Variation" } } } } } }, "Nf3": { "_metadata": { "eco": "C21", "name": "Center Game: Kieseritzky Variation" }, "c5": { "_metadata": { "eco": "C21", "name": "Center Game: Kieseritzky Variation" }, "Bc4": { "_metadata": { "eco": "C21", "name": "Center Game: Kieseritzky Variation" } } }, "Bc5": { "c3": { "_metadata": { "eco": "C21", "name": "Center Game: Lanc-Arnold Gambit" }, "dxc3": { "Bc4": { "_metadata": { "eco": "C21", "name": "Center Game: Lanc-Arnold Gambit, Schippler Gambit" } } } } } }, "Bd3": { "_metadata": { "eco": "C21", "name": "Center Game: Ross Gambit" } }, "Bc4": { "_metadata": { "eco": "C21", "name": "Center Game: von der Lasa Gambit" } }, "c3": { "_metadata": { "eco": "C21", "name": "Danish Gambit" }, "dxc3": { "_metadata": { "eco": "C21", "name": "Danish Gambit Accepted" }, "Bc4": { "cxb2": { "Bxb2": { "Qe7": { "_metadata": { "eco": "C21", "name": "Danish Gambit Accepted: Chigorin Defense" } }, "Nf6": { "_metadata": { "eco": "C21", "name": "Danish Gambit Accepted: Classical Defense" } }, "Bb4+": { "_metadata": { "eco": "C21", "name": "Danish Gambit Accepted: Copenhagen Defense" } }, "d5": { "_metadata": { "eco": "C21", "name": "Danish Gambit Accepted: Schlechter Defense" } } } } } }, "Ne7": { "_metadata": { "eco": "C21", "name": "Danish Gambit Accepted: Svenonius Defense" } }, "d5": { "_metadata": { "eco": "C21", "name": "Danish Gambit Declined: S\u00f6rensen Defense" } } } } }, "c4": { "_metadata": { "eco": "C20", "name": "English Opening: The Whale" }, "d5": { "_metadata": { "eco": "C20", "name": "King's Pawn Game: Bavarian Gambit" } } }, "_metadata": { "eco": "C20", "name": "King's Pawn Game" }, "Ne2": { "_metadata": { "eco": "C20", "name": "King's Pawn Game: Alapin Opening" } }, "d3": { "f5": { "_metadata": { "eco": "C20", "name": "King's Pawn Game: Clam Variation, King's Gambit Reversed" } }, "Nf6": { "f4": { "Bc5": { "_metadata": { "eco": "C20", "name": "King's Pawn Game: Clam Variation, Radisch Gambit" } } } }, "_metadata": { "eco": "C20", "name": "King's Pawn Game: Leonardis Variation" }, "d5": { "exd5": { "c6": { "dxc6": { "Nxc6": { "_metadata": { "eco": "C20", "name": "King's Pawn Game: Weber Gambit" } } } } } } }, "f3": { "_metadata": { "eco": "C20", "name": "King's Pawn Game: King's Head Opening" }, "Nf6": { "Nc3": { "_metadata": { "eco": "C20", "name": "King's Pawn Game: King's Head Opening" } } } }, "c3": { "_metadata": { "eco": "C20", "name": "King's Pawn Game: MacLeod Attack" }, "f5": { "_metadata": { "eco": "C20", "name": "King's Pawn Game: MacLeod Attack, Lasa Gambit" } }, "d5": { "Qh5": { "Bd6": { "_metadata": { "eco": "C20", "name": "King's Pawn Game: MacLeod Attack, Norwalde Gambit" } } } } }, "a3": { "_metadata": { "eco": "C20", "name": "King's Pawn Game: Mengarini's Opening" } }, "Qf3": { "_metadata": { "eco": "C20", "name": "King's Pawn Game: Napoleon Attack" } }, "Bd3": { "_metadata": { "eco": "C20", "name": "King's Pawn Game: Tortoise Opening" } }, "Qh5": { "_metadata": { "eco": "C20", "name": "King's Pawn Game: Wayward Queen Attack" }, "Nf6": { "_metadata": { "eco": "C20", "name": "King's Pawn Game: Wayward Queen Attack, Kiddie Countergambit" } }, "Nc6": { "Bc4": { "Nh6": { "d3": { "g6": { "Qf3": { "f6": { "Ne2": { "d5": { "_metadata": { "eco": "C20", "name": "King's Pawn Game: Wayward Queen Attack, Mellon Gambit" } } } } } } } } } } }, "b3": { "_metadata": { "eco": "C20", "name": "King's Pawn Opening" } }, "Qg4": { "Nf6": { "Qf5": { "_metadata": { "eco": "C20", "name": "King's Pawn Opening: Speers" } } } }, "Qe2": { "Nc6": { "c3": { "Nf6": { "Nf3": { "Bc5": { "d4": { "exd4": { "cxd4": { "Nxd4": { "_metadata": { "eco": "C20", "name": "King's Pawn Opening: Van Hooydoon Gambit" } } } } } } } } } } }, "Bb5": { "_metadata": { "eco": "C20", "name": "Portuguese Opening" }, "Bc5": { "b4": { "_metadata": { "eco": "C20", "name": "Portuguese Opening: Miguel Gambit" } } }, "Nf6": { "d4": { "_metadata": { "eco": "C20", "name": "Portuguese Opening: Portuguese Gambit" } } } }, "Bc4": { "_metadata": { "eco": "C23", "name": "Bishop's Opening" }, "b5": { "Bxb5": { "c6": { "_metadata": { "eco": "C23", "name": "Bishop's Opening: Anderssen Gambit" } }, "f5": { "_metadata": { "eco": "C23", "name": "Bishop's Opening: Thorold Gambit" } } } }, "Bc5": { "_metadata": { "eco": "C23", "name": "Bishop's Opening: Boi Variation" }, "b4": { "Bxb4": { "f4": { "exf4": { "Nf3": { "Be7": { "d4": { "Bh4+": { "g3": { "fxg3": { "O-O": { "gxh2+": { "Kh1": { "_metadata": { "eco": "C23", "name": "Bishop's Opening: Four Pawns Gambit" } } } } } } } } } } }, "_metadata": { "eco": "C23", "name": "Bishop's Opening: McDonnell Gambit, McDonnell Double Gambit" } }, "c3": { "_metadata": { "eco": "C23", "name": "Bishop's Opening: McDonnell Gambit, La Bourdonnais-Denker Gambit" } } }, "_metadata": { "eco": "C23", "name": "Bishop's Opening: McDonnell Gambit" } }, "c3": { "d5": { "_metadata": { "eco": "C23", "name": "Bishop's Opening: Lewis Countergambit" }, "Bxd5": { "Nf6": { "_metadata": { "eco": "C23", "name": "Bishop's Opening: Lewis Countergambit" }, "d4": { "_metadata": { "eco": "C23", "name": "Bishop's Opening: Lewis Countergambit, Walker Variation" } } } } }, "_metadata": { "eco": "C23", "name": "Bishop's Opening: Philidor Variation" }, "Nf6": { "d4": { "exd4": { "e5": { "d5": { "exf6": { "dxc4": { "Qh5": { "O-O": { "_metadata": { "eco": "C23", "name": "Bishop's Opening: Pratt Variation" } } } } } } } } } }, "Qg5": { "_metadata": { "eco": "C23", "name": "Bishop's Opening: del Rio Variation" } } }, "d4": { "_metadata": { "eco": "C23", "name": "Bishop's Opening: Lewis Gambit" } }, "Qe2": { "Nc6": { "c3": { "Nf6": { "f4": { "_metadata": { "eco": "C23", "name": "Bishop's Opening: Lopez Gambit" } } } } }, "_metadata": { "eco": "C23", "name": "Bishop's Opening: Lopez Variation" }, "Nf6": { "f4": { "_metadata": { "eco": "C23", "name": "Bishop's Opening: Lopez Variation, Lopez Gambit" } } } }, "f4": { "_metadata": { "eco": "C23", "name": "Bishop's Opening: Stein Gambit" } } }, "f5": { "_metadata": { "eco": "C23", "name": "Bishop's Opening: Calabrese Countergambit" }, "d3": { "_metadata": { "eco": "C23", "name": "Bishop's Opening: Calabrese Countergambit, Jaenisch Variation" } } }, "d5": { "_metadata": { "eco": "C23", "name": "Bishop's Opening: Khan Gambit" } }, "c6": { "d4": { "d5": { "exd5": { "cxd5": { "Bb5+": { "Bd7": { "Bxd7+": { "Nxd7": { "dxe5": { "Nxe5": { "Ne2": { "_metadata": { "eco": "C23", "name": "Bishop's Opening: Lisitsyn Variation" } } } } } } } } } } } }, "_metadata": { "eco": "C23", "name": "Bishop's Opening: Philidor Counterattack" } }, "Nf6": { "_metadata": { "eco": "C24", "name": "Bishop's Opening: Berlin Defense" }, "f4": { "_metadata": { "eco": "C24", "name": "Bishop's Opening: Berlin Defense, Greco Gambit" } }, "d3": { "Be7": { "Nf3": { "O-O": { "_metadata": { "eco": "C24", "name": "Bishop's Opening: Kitchener Folly" } } } }, "Nc6": { "Nc3": { "_metadata": { "eco": "C24", "name": "Bishop's Opening: Vienna Hybrid" } } } }, "f3": { "Bc5": { "Ne2": { "Nc6": { "b4": { "_metadata": { "eco": "C24", "name": "Bishop's Opening: Krejcik Gambit" } } } } } }, "Ne2": { "Nxe4": { "Nec3": { "_metadata": { "eco": "C24", "name": "Bishop's Opening: Pachman Gambit" } } } }, "d4": { "_metadata": { "eco": "C24", "name": "Bishop's Opening: Ponziani Gambit" }, "exd4": { "Nf3": { "d5": { "exd5": { "Bb4+": { "c3": { "Qe7+": { "_metadata": { "eco": "C24", "name": "Bishop's Opening: Urusov Gambit, Panov Variation" } } } } } }, "_metadata": { "eco": "C43", "name": "Bishop's Opening: Urusov Gambit" }, "Nxe4": { "Qxd4": { "_metadata": { "eco": "C43", "name": "Bishop's Opening: Urusov Gambit, Keidansky Gambit" } } } }, "c3": { "_metadata": { "eco": "C24", "name": "Bishop's Opening: Warsaw Gambit" } } } }, "Nc3": { "b5": { "_metadata": { "eco": "C26", "name": "Bishop's Opening: Horwitz Gambit" } } } }, "Nc6": { "Nc3": { "Nf6": { "d3": { "Bc5": { "f4": { "d6": { "Nf3": { "Bg4": { "h3": { "Bxf3": { "Qxf3": { "exf4": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Classical, Svenonius Variation" } } } } } } } } } } } } } } }, "Nc3": { "Nc6": { "f4": { "_metadata": { "eco": "C25", "name": "Vienna Gambit, with Max Lange Defense" }, "exf4": { "Nf3": { "Be7": { "_metadata": { "eco": "C25", "name": "Vienna Gambit, with Max Lange Defense: Cunningham Defense" } }, "g5": { "h4": { "g4": { "Ng5": { "_metadata": { "eco": "C25", "name": "Vienna Gambit, with Max Lange Defense: Hamppe-Allgaier Gambit" }, "d6": { "_metadata": { "eco": "C25", "name": "Vienna Gambit, with Max Lange Defense: Hamppe-Allgaier Gambit, Alapin Variation" } } } } }, "Bc4": { "g4": { "O-O": { "gxf3": { "_metadata": { "eco": "C25", "name": "Vienna Gambit, with Max Lange Defense: Hamppe-Muzio Gambit" }, "Qxf3": { "Ne5": { "Qxf4": { "Qf6": { "_metadata": { "eco": "C25", "name": "Vienna Game: Hamppe-Muzio, Dubois Variation" } } } } } }, "_metadata": { "eco": "C25", "name": "Vienna Game: Hamppe-Muzio Gambit" } } } }, "d4": { "_metadata": { "eco": "C25", "name": "Vienna Gambit, with Max Lange Defense: Pierce Gambit" }, "g4": { "Bc4": { "gxf3": { "O-O": { "d5": { "exd5": { "Bg4": { "dxc6": { "_metadata": { "eco": "C25", "name": "Vienna Game: Pierce Gambit, Rushmere Attack" } } } } } } } } } } }, "_metadata": { "eco": "C25", "name": "Vienna Gambit, with Max Lange Defense: Knight Variation" } }, "d4": { "_metadata": { "eco": "C25", "name": "Vienna Gambit, with Max Lange Defense: Steinitz Gambit" }, "Qh4+": { "Ke2": { "b6": { "_metadata": { "eco": "C25", "name": "Vienna Gambit, with Max Lange Defense: Steinitz Gambit, Fraser-Minckwitz Defense" } }, "_metadata": { "eco": "C25", "name": "Vienna Gambit, with Max Lange Defense: Steinitz Gambit, Main Line" }, "d6": { "_metadata": { "eco": "C25", "name": "Vienna Gambit, with Max Lange Defense: Steinitz Gambit, Paulsen Defense" } }, "g5": { "_metadata": { "eco": "C25", "name": "Vienna Gambit, with Max Lange Defense: Steinitz Gambit, S\u00f6rensen Defense" } }, "d5": { "_metadata": { "eco": "C25", "name": "Vienna Gambit, with Max Lange Defense: Steinitz Gambit, Zukertort Defense" } } } } } }, "Bc5": { "fxe5": { "d6": { "_metadata": { "eco": "C25", "name": "Vienna Gambit, with Max Lange Defense: Quelle Gambit" } } } } }, "d4": { "_metadata": { "eco": "C25", "name": "Vienna Game: Fyfe Gambit" }, "f5": { "_metadata": { "eco": "C25", "name": "Vienna Game: Philidor Countergambit" } } }, "_metadata": { "eco": "C25", "name": "Vienna Game: Max Lange Defense" }, "g3": { "_metadata": { "eco": "C25", "name": "Vienna Game: Paulsen Variation" }, "Nf6": { "Bg2": { "Bc5": { "Nge2": { "d5": { "_metadata": { "eco": "C25", "name": "Vienna Game: Paulsen Variation" } } } } } }, "Bc5": { "Bg2": { "h5": { "Nf3": { "h4": { "_metadata": { "eco": "C25", "name": "Vienna Game: Paulsen Variation, Mariotti Gambit" } } } } } } }, "Bc4": { "Bc5": { "Qg4": { "Qf6": { "Nd5": { "_metadata": { "eco": "C25", "name": "Vienna Game: Stanley Variation, Meitner-Mieses Gambit" } } } } }, "Nf6": { "d3": { "Bb4": { "Ne2": { "_metadata": { "eco": "C28", "name": "Bishop's Opening: Vienna Hybrid, Hrom\u00e1dka Variation" } } } }, "f4": { "Nxe4": { "Nf3": { "_metadata": { "eco": "C28", "name": "Vienna Game: Stanley Variation, Bronstein Gambit" } } } }, "_metadata": { "eco": "C28", "name": "Vienna Game: Stanley Variation, Three Knights Variation" } } } }, "_metadata": { "eco": "C25", "name": "Vienna Game" }, "Bc5": { "_metadata": { "eco": "C25", "name": "Vienna Game: Anderssen Defense" }, "Qg4": { "_metadata": { "eco": "C25", "name": "Vienna Game: Giraffe Attack" } }, "Na4": { "_metadata": { "eco": "C25", "name": "Vienna Game: Hamppe-Meitner Variation" } } }, "d6": { "f4": { "_metadata": { "eco": "C25", "name": "Vienna Game: Omaha Gambit" } } }, "Bb4": { "Qg4": { "Nf6": { "_metadata": { "eco": "C25", "name": "Vienna Game: Zhuravlev Countergambit" } } } }, "Nf6": { "Bc4": { "Bc5": { "d3": { "_metadata": { "eco": "C26", "name": "Bishop's Opening: Vienna Hybrid, Spielmann Attack" } }, "Nge2": { "b5": { "_metadata": { "eco": "C26", "name": "Vienna Game: Stanley Variation, Eifel Gambit" } } } }, "_metadata": { "eco": "C26", "name": "Vienna Game: Stanley Variation" }, "Bb4": { "_metadata": { "eco": "C26", "name": "Vienna Game: Stanley Variation, Reversed Spanish" } }, "Nxe4": { "Qh5": { "Nd6": { "Bb3": { "Nc6": { "d4": { "_metadata": { "eco": "C27", "name": "Vienna Game: Adams' Gambit" } }, "Nb5": { "g6": { "Qf3": { "f5": { "Qd5": { "Qe7": { "Nxc7+": { "Kd8": { "Nxa8": { "b6": { "_metadata": { "eco": "C27", "name": "Vienna Game: Stanley Variation, Frankenstein-Dracula Variation" } } } } } } } } } } } }, "Be7": { "Nf3": { "Nc6": { "Nxe5": { "_metadata": { "eco": "C27", "name": "Vienna Game: Stanley Variation, Alekhine Variation" } } } }, "_metadata": { "eco": "C27", "name": "Vienna Game: Stanley Variation, Monster Declined" } } } } }, "_metadata": { "eco": "C27", "name": "Vienna Game: Frankenstein-Dracula Variation" } } }, "_metadata": { "eco": "C26", "name": "Vienna Game: Falkbeer Variation" }, "a3": { "_metadata": { "eco": "C26", "name": "Vienna Game: Mengarini Variation" } }, "g3": { "_metadata": { "eco": "C26", "name": "Vienna Game: Mieses Variation" }, "d5": { "exd5": { "c6": { "_metadata": { "eco": "C26", "name": "Vienna Game: Mieses Variation, Erben Gambit" } } } }, "Bc5": { "Bg2": { "Nc6": { "Nge2": { "d5": { "exd5": { "_metadata": { "eco": "C26", "name": "Vienna Game: Paulsen Variation, Pollock Gambit" } } } } } } } }, "f4": { "d5": { "fxe5": { "Nxe4": { "Qf3": { "f5": { "d4": { "_metadata": { "eco": "C29", "name": "Vienna Game: Heyde Variation" } }, "_metadata": { "eco": "C29", "name": "Vienna Game: Vienna Gambit, Bardeleben Variation" } }, "_metadata": { "eco": "C29", "name": "Vienna Game: Vienna Gambit, Paulsen Attack" } }, "Nf3": { "Be7": { "_metadata": { "eco": "C29", "name": "Vienna Game: Vienna Gambit, Breyer Variation" } }, "Bg4": { "Qe2": { "_metadata": { "eco": "C29", "name": "Vienna Game: Vienna Gambit, Kaufmann Variation" } } } }, "d3": { "_metadata": { "eco": "C29", "name": "Vienna Game: Vienna Gambit, Modern Variation" }, "Qh4+": { "g3": { "Nxg3": { "Nf3": { "Qh5": { "Nxd5": { "_metadata": { "eco": "C29", "name": "Vienna Game: Vienna Gambit, Wurzburger Trap" } } } } } } } } } }, "_metadata": { "eco": "C29", "name": "Vienna Game: Vienna Gambit, Main Line" }, "d3": { "_metadata": { "eco": "C29", "name": "Vienna Game: Vienna Gambit, Steinitz Variation" } }, "exd5": { "e4": { "d3": { "Bb4": { "Bd2": { "e3": { "_metadata": { "eco": "C31", "name": "King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit, Morphy Defense" } } } } } } } }, "_metadata": { "eco": "C29", "name": "Vienna Game: Vienna Gambit" } } } }, "f4": { "exf4": { "Nf3": { "Nc6": { "Nc3": { "g5": { "h4": { "g4": { "Ng5": { "h6": { "Nxf7": { "Kxf7": { "d4": { "_metadata": { "eco": "C25", "name": "Vienna Gambit, with Max Lange Defense: Hamppe-Allgaier Gambit, Thorold Variation" } } } } } } } } } }, "_metadata": { "eco": "C34", "name": "King's Gambit Accepted: MacLeod Defense" }, "Bc4": { "g5": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Blachly Gambit" } } } }, "h6": { "_metadata": { "eco": "C34", "name": "King's Gambit Accepted: Becker Defense" }, "Bc4": { "d6": { "d4": { "g5": { "h4": { "Bg7": { "Qd3": { "_metadata": { "eco": "C38", "name": "King's Gambit Accepted: Philidor Gambit, Schultz Variation" } } } } } } } } }, "Ne7": { "_metadata": { "eco": "C34", "name": "King's Gambit Accepted: Bonsch-Osmolovsky Variation" } }, "d6": { "_metadata": { "eco": "C34", "name": "King's Gambit Accepted: Fischer Defense" }, "b4": { "_metadata": { "eco": "C34", "name": "King's Gambit Accepted: Fischer Defense, Schulder Gambit" } }, "d4": { "Nf6": { "Bd3": { "_metadata": { "eco": "C34", "name": "King's Gambit Accepted: Fischer Defense, Spanish Variation" } } } }, "Bc4": { "h6": { "d4": { "g5": { "h4": { "Bg7": { "_metadata": { "eco": "C34", "name": "King's Gambit Accepted: Greco Gambit" } } } } } } } }, "f5": { "_metadata": { "eco": "C34", "name": "King's Gambit Accepted: Gianutio Countergambit" } }, "g5": { "_metadata": { "eco": "C34", "name": "King's Gambit Accepted: King's Knight's Gambit" }, "Bc4": { "g4": { "h4": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Australian Gambit" } }, "O-O": { "gxf3": { "Qxf3": { "Qf6": { "e5": { "Qxe5": { "Bxf7+": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Double Muzio Gambit" } }, "d3": { "Bh6": { "Nc3": { "Ne7": { "Bd2": { "Nbc6": { "1Rae1": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Double Muzio Gambit, Paulsen Defense" } } } } } } } } } }, "Nc3": { "Qd4+": { "Kh1": { "Qxc4": { "Nd5": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Double Muzio Gambit, Baldwin Gambit" } } } } }, "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Double Muzio Gambit, Bello Gambit" } }, "Bxf7+": { "Kxf7": { "d4": { "Qxd4+": { "Be3": { "Qf6": { "Nc3": { "fxe3": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Double Muzio Gambit, Young Gambit" } } } } } } } } }, "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Muzio Gambit, Sarratt Defense" } }, "Qe7": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Muzio Gambit Accepted, From's Defense" } }, "Nc6": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Muzio Gambit, Holloway Defense" } } } }, "d5": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Muzio Gambit, Brentano Defense" } }, "Qe7": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Muzio Gambit, Kling and Horwitz Counterattack" } }, "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Muzio Gambit, Wild Muzio Gambit" } }, "d4": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Ghulam-Kassim Gambit" }, "gxf3": { "Qxf3": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Ghulam-Kassim Gambit" } }, "Bxf4": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Kotov Gambit" } } } }, "Bxf7+": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Lolli Gambit" }, "Kxf7": { "O-O": { "gxf3": { "Qxf3": { "Qf6": { "d4": { "Qxd4+": { "Be3": { "Qf6": { "Nc3": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Lolli Gambit, Young Variation" } } } } } } } } } } } }, "Nc3": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: McDonnell Gambit" } }, "Ne5": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Salvio Gambit" }, "Qh4+": { "Kf1": { "Nh6": { "d4": { "d6": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Salvio Gambit, Anderssen Counterattack" } }, "f3": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Silberschmidt Gambit" } } }, "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Salvio Gambit, Silberschmidt Defense" } }, "f3": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Salvio Gambit, Cochrane Gambit" } }, "Nf6": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Salvio Gambit, Santa Maria Defense" } }, "Nc6": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Salvio Gambit, Viennese Variation" } } } } } }, "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: King's Knight's Gambit" }, "d6": { "O-O": { "Bg4": { "h3": { "h5": { "hxg4": { "hxg4": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Middleton Countergambit" } } } } } } } }, "Bg7": { "h4": { "h6": { "d4": { "d6": { "Nc3": { "c6": { "hxg5": { "hxg5": { "Rxh8": { "Bxh8": { "Ne5": { "_metadata": { "eco": "C38", "name": "King's Gambit Accepted: Greco Gambit" } } } } } } } } } } }, "_metadata": { "eco": "C38", "name": "King's Gambit Accepted: Philidor Gambit" } }, "O-O": { "_metadata": { "eco": "C38", "name": "King's Gambit Accepted: Hanstein Gambit" } }, "d4": { "d6": { "c3": { "_metadata": { "eco": "C38", "name": "King's Gambit Accepted: Mayet Gambit" } } } }, "_metadata": { "eco": "C38", "name": "King's Gambit Accepted: Traditional Variation" } } }, "Nc3": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Quaade Gambit" } }, "d4": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Rosentreter Gambit" }, "g4": { "Ne5": { "Qh4+": { "g3": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Rosentreter Gambit, Bird Gambit" } } }, "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: S\u00f6rensen Gambit" } }, "Nc3": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Rosentreter Gambit, S\u00f6rensen Gambit" } }, "Bxf4": { "_metadata": { "eco": "C37", "name": "King's Gambit Accepted: Rosentreter Gambit, Testa Variation" } } } }, "h4": { "g4": { "Ng5": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Allgaier Gambit" }, "h6": { "Nxf7": { "Kxf7": { "d4": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Allgaier Gambit, Thorold Attack" }, "d5": { "Bxf4": { "dxe4": { "Bc4+": { "Kg7": { "Be5+": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Allgaier, Cook Variation" } } } } } } } }, "Bc4+": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Allgaier Gambit, Urusov Attack" }, "d5": { "Bxd5+": { "Kg7": { "d4": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Allgaier, Urusov Attack" } } } } } }, "Nc3": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Allgaier, Blackburne Gambit" } }, "Qxg4": { "Nf6": { "Qxf4": { "Bd6": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Allgaier, Horny Defense" } } } } } }, "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Kieseritzky Gambit, Cotter Gambit" } } }, "Nf6": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Allgaier, Schlechter Defense" } } }, "Ne5": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Kieseritzky Gambit" }, "Nf6": { "Bc4": { "d5": { "exd5": { "Bd6": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Kieseritzky Gambit, Anderssen Defense" }, "d4": { "Nh5": { "Bxf4": { "Nxf4": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Kieseritzky Gambit, Anderssen-Cordel Gambit" } } } } }, "O-O": { "Bxe5": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Kieseritzky Gambit, Rice Gambit" } }, "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Kieseritzky, Rice Gambit" } } }, "Bg7": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Kieseritzky Gambit, Paulsen Defense Deferred" } } } } }, "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Kieseritzky Gambit, Berlin Defense" }, "d4": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Kieseritzky Gambit, Berlin Defense, Rubinstein Variation" } }, "Nxg4": { "d5": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Kieseritzky Gambit, Berlin Defense, de Riviere Variation" } } } }, "d5": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Kieseritzky Gambit, Brentano Defense" }, "d4": { "Nf6": { "Bxf4": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Kieseritzky Gambit, Brentano Defense" }, "Nxe4": { "Nd2": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Kieseritzky Gambit, Brentano Defense, Caro Variation" } } } } } } }, "d6": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Kieseritzky Gambit, Kolisch Defense" } }, "h5": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Kieseritzky Gambit, Long Whip" }, "Bc4": { "Rh7": { "d4": { "Bh6": { "Nc3": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Kieseritzky, Long Whip Defense, Jaenisch Variation" } } } } } } }, "Nc6": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Kieseritzky Gambit, Neumann Defense" } }, "Bg7": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Kieseritzky Gambit, Paulsen Defense" } }, "Qe7": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Kieseritzky Gambit, Rosenthal Defense" }, "d4": { "f5": { "Bc4": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Kieseritzky, Salvio Defense, Cozio Variation" } } } } }, "Be7": { "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: Kieseritzky, Polerio Defense" } } } }, "_metadata": { "eco": "C39", "name": "King's Gambit Accepted: King's Knight's Gambit" } } }, "_metadata": { "eco": "C34", "name": "King's Gambit Accepted: King's Knight's Gambit" }, "Nf6": { "_metadata": { "eco": "C34", "name": "King's Gambit Accepted: Schallopp Defense" }, "e5": { "Nh5": { "g4": { "_metadata": { "eco": "C34", "name": "King's Gambit Accepted: Schallopp Defense, Tashkent Attack" } } } } }, "h5": { "_metadata": { "eco": "C34", "name": "King's Gambit Accepted: Wagenbach Defense" } }, "Be7": { "_metadata": { "eco": "C35", "name": "King's Gambit Accepted: Cunningham Defense" }, "Bc4": { "Bh4+": { "g3": { "_metadata": { "eco": "C35", "name": "King's Gambit Accepted: Cunningham Defense, Bertin Gambit" }, "fxg3": { "O-O": { "gxh2+": { "Kh1": { "_metadata": { "eco": "C35", "name": "King's Gambit Accepted: Cunningham Defense, Bertin Gambit" } } } } } } }, "Nf6": { "_metadata": { "eco": "C35", "name": "King's Gambit Accepted: Cunningham Defense, McCormick Defense" } } } }, "d5": { "exd5": { "Nf6": { "_metadata": { "eco": "C36", "name": "King's Gambit Accepted: Abbazia Defense" }, "Bb5+": { "c6": { "dxc6": { "bxc6": { "Bc4": { "Nd5": { "_metadata": { "eco": "C36", "name": "King's Gambit Accepted: Abbazia Defense, Main Line" } } } } } } } }, "_metadata": { "eco": "C36", "name": "King's Gambit Accepted: Modern Defense" } }, "_metadata": { "eco": "C36", "name": "King's Gambit Accepted: Modern Defense" } } }, "_metadata": { "eco": "C33", "name": "King's Gambit Accepted" }, "Qe2": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Basman Gambit" } }, "Bc4": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit" }, "g5": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Anderssen Defense" } }, "d5": { "Bxd5": { "c6": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Anderssen Variation" } }, "Nf6": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Bledow Countergambit" } }, "Qh4+": { "Kf1": { "Bd6": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Boren-Svenonius Variation" } } } } }, "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Bledow Variation" } }, "Qh4+": { "Kf1": { "Nc6": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Boden Variation" } }, "b5": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Bryan Countergambit" } }, "d5": { "Bxd5": { "g5": { "g3": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Chigorin's Attack" } } } } }, "Ne7": { "Nc3": { "g5": { "d4": { "Bg7": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Classical Defense" } } } } } }, "g5": { "Qf3": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Classical Defense, Cozio Attack" } }, "Nc3": { "Bg7": { "g3": { "fxg3": { "Qf3": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Fraser Variation" } } }, "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, McDonnell Attack" } }, "d4": { "d6": { "e5": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Grimm Attack" } } }, "Ne7": { "g3": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, McDonnell Attack" } } } } } }, "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Lopez Variation" } }, "d6": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Cozio Variation" } }, "Nf6": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, First Jaenisch Variation" } }, "Bc5": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Greco Variation" } } } }, "Nf6": { "Nc3": { "c6": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Bogoljubow Defense" } }, "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Bogoljubow Variation" }, "Bb4": { "e5": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Paulsen Attack" } } } }, "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Cozio Defense" } }, "f5": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Gianutio Gambit" }, "Qe2": { "Qh4+": { "Kd1": { "fxe4": { "Nc3": { "Kd8": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Lopez-Gianutio Countergambit, Hein Variation" } } } } } } } }, "b5": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Kieseritzky Gambit" } }, "c6": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Lopez Defense" } }, "Nc6": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Maurian Defense" } }, "Ne7": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Bishop's Gambit, Steinitz Defense" } } }, "Qf3": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Breyer Gambit" } }, "Qh5": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Carrera Gambit" } }, "Qg4": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Dodo Variation" } }, "Nh3": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Eisenberg Variation" } }, "g3": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Gaga Gambit" } }, "Nc3": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Mason-Keres Gambit" } }, "b3": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Orsini Gambit" } }, "Ne2": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Paris Gambit" } }, "Bb5": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Schurig Gambit, with Bb5" } }, "Bd3": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Schurig Gambit, with Bd3" } }, "h4": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Stamma Gambit" } }, "Be2": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Tartakower Gambit" }, "f5": { "exf5": { "d6": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Tartakower Gambit, Weiss Defense" } } } } }, "Kf2": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Tumbleweed" } }, "d4": { "_metadata": { "eco": "C33", "name": "King's Gambit Accepted: Villemson Gambit" } } }, "_metadata": { "eco": "C30", "name": "King's Gambit" }, "Bc5": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Classical Variation" }, "Nf3": { "d6": { "c3": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Classical Variation" }, "Bg4": { "fxe5": { "dxe5": { "Qa4+": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Classical Variation, Euwe Attack" } } } } }, "f5": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Classical Variation, Rubinstein Countergambit" }, "fxe5": { "dxe5": { "d4": { "exd4": { "Bc4": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Classical, R\u00fcti Variation" } } } } } } } }, "b4": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Classical Variation, Rotlewi Countergambit" } }, "Nc3": { "Nd7": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Classical, Hanham Variation" } } }, "fxe5": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Classical, Soldatenkov Variation" } } }, "g5": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Senechaud Countergambit" } } }, "Qh5": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Classical Variation, Walthoffen Attack" } } }, "Nc6": { "Nf3": { "g5": { "fxg5": { "h6": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Hobbs-Zilbermints Gambit" } } }, "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Zilbermints Double Gambit" } }, "f5": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Miles Defense" } } }, "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Queen's Knight Defense" } }, "Qh4+": { "g3": { "Qe7": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Keene Defense" } }, "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Keene's Defense" } }, "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Keene's Defense" } }, "Qf6": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Norwalde Variation" }, "Nc3": { "Qxf4": { "Nf3": { "Bb4": { "Bc4": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Norwalde Variation, B\u00fccker Gambit" } } } }, "d4": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Norwalde Variation, Schubert Variation" } } } } }, "f5": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Panteldakis Countergambit" }, "exf5": { "Qh4+": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Panteldakis Countergambit, Greco Variation" } }, "exf4": { "Qh5+": { "g6": { "fxg6": { "Qe7+": { "Kd1": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Panteldakis Countergambit, Pawn Sacrifice Line" } } } } }, "Ke7": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Panteldakis Countergambit, Shirazi Line" } } }, "Nf3": { "d5": { "d4": { "Bd6": { "Bd3": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Panteldakis Countergambit, Symmetrical Variation" } } } } } } }, "Bc5": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Panteldakis Countergambit, Schiller's Defense" } } } }, "Nf6": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Petrov's Defense" } }, "f6": { "fxe5": { "Nc6": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Soller-Zilbermints Gambit" } } } }, "g5": { "_metadata": { "eco": "C30", "name": "King's Gambit Declined: Zilbermints Double Countergambit" } }, "d5": { "_metadata": { "eco": "C31", "name": "King's Gambit Declined: Falkbeer Countergambit" }, "exd5": { "_metadata": { "eco": "C31", "name": "King's Gambit Declined: Falkbeer Countergambit Accepted" }, "e4": { "Bb5+": { "_metadata": { "eco": "C31", "name": "King's Gambit Declined: Falkbeer Countergambit, Anderssen Attack" } }, "d3": { "_metadata": { "eco": "C31", "name": "King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit" }, "Nf6": { "dxe4": { "Nxe4": { "Nf3": { "Bc5": { "Qe2": { "Bf2+": { "Kd1": { "Qxd5+": { "Nfd2": { "_metadata": { "eco": "C32", "name": "King's Gambit Declined: Falkbeer Countergambit, Alapin Variation" } } } } }, "Bf5": { "_metadata": { "eco": "C32", "name": "King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit, Main Line" }, "g4": { "O-O": { "_metadata": { "eco": "C32", "name": "King's Gambit Declined: Falkbeer Countergambit, Tarrasch Variation" } } } } } } }, "Qe2": { "_metadata": { "eco": "C32", "name": "King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit" }, "Qxd5": { "Nd2": { "f5": { "g4": { "_metadata": { "eco": "C32", "name": "King's Gambit Declined: Falkbeer Countergambit, Charousek Variation" } } } } } } }, "_metadata": { "eco": "C32", "name": "King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit Accepted" } }, "Nd2": { "_metadata": { "eco": "C32", "name": "King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit, Keres Variation" } }, "Qe2": { "_metadata": { "eco": "C32", "name": "King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit, Old Line" } } } }, "Nc3": { "Nf6": { "Qe2": { "_metadata": { "eco": "C31", "name": "King's Gambit Declined: Falkbeer Countergambit, Rubinstein Variation" } } } }, "_metadata": { "eco": "C31", "name": "King's Gambit Declined: Falkbeer Countergambit, Staunton Line" } }, "Bc5": { "_metadata": { "eco": "C31", "name": "King's Gambit Declined: Falkbeer Countergambit, Miles Gambit" } }, "exf4": { "_metadata": { "eco": "C31", "name": "King's Gambit Declined: Falkbeer Countergambit, Modern Transfer" } }, "c6": { "_metadata": { "eco": "C31", "name": "King's Gambit Declined: Falkbeer Countergambit, Nimzowitsch-Marshall Countergambit" }, "dxc6": { "Bc5": { "_metadata": { "eco": "C31", "name": "King's Gambit Declined: Falkbeer Countergambit, Pickler Gambit" } } } } }, "Nf3": { "_metadata": { "eco": "C31", "name": "King's Gambit Declined: Falkbeer Countergambit, Blackburne Attack" } }, "d4": { "_metadata": { "eco": "C31", "name": "King's Gambit Declined: Falkbeer Countergambit, Hinrichsen Gambit" } }, "Nc3": { "_metadata": { "eco": "C31", "name": "King's Gambit Declined: Falkbeer Countergambit, Milner-Barry Variation" }, "dxe4": { "Nxe4": { "_metadata": { "eco": "C31", "name": "Van Geet Opening: Gr\u00fcnfeld Defense, Steiner Gambit" } } } } } }, "Nf3": { "Nf6": { "Bc4": { "Nxe4": { "Nc3": { "_metadata": { "eco": "C27", "name": "Bishop's Opening: Boden-Kieseritzky Gambit" }, "d5": { "_metadata": { "eco": "C27", "name": "Bishop's Opening: Boden-Kieseritzky Gambit, Lichtenhein Defense" } } } }, "_metadata": { "eco": "C42", "name": "Petrov's Defense: Italian Variation" } }, "_metadata": { "eco": "C42", "name": "Petrov's Defense" }, "Nxe5": { "_metadata": { "eco": "C42", "name": "Petrov's Defense" }, "d6": { "_metadata": { "eco": "C42", "name": "Petrov's Defense" }, "Nf3": { "_metadata": { "eco": "C42", "name": "Petrov's Defense" }, "Nxe4": { "_metadata": { "eco": "C42", "name": "Petrov's Defense" }, "d4": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Classical Attack" }, "d5": { "Bd3": { "Be7": { "O-O": { "Nc6": { "Re1": { "Bg4": { "c3": { "f5": { "Nbd2": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Classical Attack, Berger Variation" } }, "c4": { "Bh4": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Classical Attack, Mar\u00f3czy Variation" } } } } } }, "_metadata": { "eco": "C42", "name": "Petrov's Defense: Classical Attack, Chigorin Variation" } } }, "O-O": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Classical Attack, Mason Variation" } } } }, "Nc6": { "O-O": { "Be7": { "c4": { "Nb4": { "cxd5": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Classical Attack, Chigorin Variation, Browne Attack" } }, "Be2": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Classical Attack, Chigorin Variation, Main Line" } } }, "_metadata": { "eco": "C42", "name": "Petrov's Defense: Classical Attack, Jaenisch Variation" } }, "Re1": { "Bg4": { "c3": { "f5": { "c4": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Classical Attack, Krause Variation" } } } } } } } }, "_metadata": { "eco": "C42", "name": "Petrov's Defense: Classical Attack, Mason-Showalter Variation" } }, "Bd6": { "O-O": { "O-O": { "c4": { "Bg4": { "cxd5": { "f5": { "Re1": { "Bxh2+": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Classical Attack, Marshall Trap" } } } } }, "_metadata": { "eco": "C42", "name": "Petrov's Defense: Classical Attack, Tarrasch Variation" } }, "c6": { "Re1": { "Bg4": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Classical Attack, Marshall Variation, Chinese Gambit" } } }, "_metadata": { "eco": "C42", "name": "Petrov's Defense: Classical Attack, Staunton Variation" } } } } }, "_metadata": { "eco": "C42", "name": "Petrov's Defense: Classical Attack, Marshall Variation" } } } }, "Nf6": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Classical Attack, Closed Variation" } } }, "Qe2": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Cozio Attack" } }, "d3": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: French Attack" } }, "c4": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Kaufmann Attack" } }, "Bd3": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Millennium Attack" } }, "Nc3": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Nimzowitsch Attack" } } } }, "Nxf7": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Cochrane Gambit" }, "Kxf7": { "Bc4+": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Cochrane Gambit, Bishop Check Line" } }, "d4": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Cochrane Gambit, Center Variation" } } } }, "Nd3": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Karklins-Martinovsky Variation" } }, "Nc4": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Paulsen Attack" } } }, "Nxe4": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Damiano Variation" }, "Qe2": { "Qe7": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Damiano Variation, Kholmov Gambit" } } } }, "Nc6": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Stafford Gambit" }, "Nxc6": { "dxc6": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Stafford Gambit" } } } } }, "Qe2": { "Nc6": { "d4": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Moody Gambit" } } } }, "Nc3": { "_metadata": { "eco": "C42", "name": "Petrov's Defense: Three Knights Game" }, "Nc6": { "Bb5": { "Nd4": { "Nxe5": { "Qe7": { "f4": { "_metadata": { "eco": "C48", "name": "Four Knights Game: Spanish Variation, Rubinstein Variation" } } } }, "O-O": { "_metadata": { "eco": "C48", "name": "Four Knights Game: Spanish Variation, Rubinstein Variation, Henneberger Variation" } } }, "Bb4": { "O-O": { "O-O": { "Nd5": { "Nxd5": { "exd5": { "e4": { "_metadata": { "eco": "C49", "name": "Four Knights Game: Spanish Variation, Gunsberg Counterattack" } } } } }, "d3": { "d6": { "Bg5": { "Be6": { "_metadata": { "eco": "C49", "name": "Four Knights Game: Spanish Variation, Symmetrical Variation, Tarrasch Variation" } } } } } } } } } } }, "d4": { "_metadata": { "eco": "C43", "name": "Petrov's Defense: Modern Attack" }, "exd4": { "_metadata": { "eco": "C43", "name": "Petrov's Defense: Modern Attack" }, "e5": { "Ne4": { "Qe2": { "Nc5": { "Nxd4": { "Nc6": { "_metadata": { "eco": "C43", "name": "Petrov's Defense: Modern Attack, Bardeleben Variation" } } } }, "_metadata": { "eco": "C43", "name": "Petrov's Defense: Modern Attack, Steinitz Variation" } }, "Qxd4": { "_metadata": { "eco": "C43", "name": "Petrov's Defense: Modern Attack, Center Attack" } }, "Bb5": { "_metadata": { "eco": "C43", "name": "Petrov's Defense: Modern Attack, Tal Gambit" } } } } }, "Nxe4": { "Bd3": { "_metadata": { "eco": "C43", "name": "Petrov's Defense: Modern Attack, Center Variation" }, "Nc6": { "_metadata": { "eco": "C43", "name": "Petrov's Defense: Modern Attack, Murrey Variation" } }, "d5": { "Nxe5": { "Bd6": { "O-O": { "O-O": { "c4": { "Bxe5": { "_metadata": { "eco": "C43", "name": "Petrov's Defense: Modern Attack, Trifunovic Variation" } } } } } } } } } }, "d5": { "_metadata": { "eco": "C43", "name": "Petrov's Defense: Modern Attack, Symmetrical Variation" } } } }, "d5": { "_metadata": { "eco": "C40", "name": "Elephant Gambit" }, "exd5": { "Bd6": { "_metadata": { "eco": "C40", "name": "Elephant Gambit: Mar\u00f3czy Gambit" } }, "e4": { "_metadata": { "eco": "C40", "name": "Elephant Gambit: Paulsen Countergambit" } } }, "Nxe5": { "dxe4": { "Bc4": { "Qg5": { "_metadata": { "eco": "C40", "name": "Elephant Gambit: Wasp Variation" } } } } } }, "Qe7": { "_metadata": { "eco": "C40", "name": "Gunderam Defense" }, "Bc4": { "f5": { "_metadata": { "eco": "C40", "name": "King's Pawn Game: Gunderam Defense, Gunderam Gambit" } } } }, "_metadata": { "eco": "C40", "name": "King's Knight Opening" }, "Bc5": { "_metadata": { "eco": "C40", "name": "King's Pawn Game: Busch-Gass Gambit" }, "Nxe5": { "Nc6": { "_metadata": { "eco": "C40", "name": "King's Pawn Game: Busch-Gass Gambit, Chiodini Gambit" } } } }, "f6": { "_metadata": { "eco": "C40", "name": "King's Pawn Game: Damiano Defense" }, "Nxe5": { "fxe5": { "Qh5+": { "g6": { "Qxe5+": { "Qe7": { "Qxh8": { "_metadata": { "eco": "C40", "name": "King's Pawn Game: Damiano Defense, Damiano Gambit" } } } } } } }, "Qe7": { "Nf3": { "d5": { "_metadata": { "eco": "C40", "name": "King's Pawn Game: Damiano Defense, Damiano Gambit, Chigorin Gambit" } } } } } }, "c6": { "_metadata": { "eco": "C40", "name": "King's Pawn Game: Gunderam Gambit" } }, "Qf6": { "Bc4": { "Qg6": { "O-O": { "_metadata": { "eco": "C40", "name": "King's Pawn Game: La Bourdonnais Gambit" } } } }, "_metadata": { "eco": "C40", "name": "King's Pawn Game: McConnell Defense" } }, "f5": { "_metadata": { "eco": "C40", "name": "Latvian Gambit" }, "exf5": { "_metadata": { "eco": "C40", "name": "Latvian Gambit Accepted" } }, "Nxe5": { "Qf6": { "d4": { "d6": { "Nc4": { "_metadata": { "eco": "C40", "name": "Latvian Gambit Accepted: Bilguer Variation" }, "fxe4": { "Be2": { "_metadata": { "eco": "C40", "name": "Latvian Gambit Accepted: Bronstein Attack" } }, "Qh5+": { "g6": { "Qe2": { "_metadata": { "eco": "C40", "name": "Latvian Gambit Accepted: Bronstein Gambit" } } } }, "Ne3": { "_metadata": { "eco": "C40", "name": "Latvian Gambit Accepted: Nimzowitsch Attack" } } } } }, "_metadata": { "eco": "C40", "name": "Latvian Gambit Accepted: Main Line" } }, "Nc4": { "fxe4": { "d3": { "_metadata": { "eco": "C40", "name": "Latvian Gambit Accepted: Foltys Variation" } }, "Nc3": { "_metadata": { "eco": "C40", "name": "Latvian Gambit Accepted: Leonhardt Variation" } } }, "_metadata": { "eco": "C40", "name": "Latvian Gambit Accepted: Foltys-Leonhardt Variation" } } }, "Nf6": { "Bc4": { "fxe4": { "Nf7": { "Qe7": { "Nxh8": { "d5": { "_metadata": { "eco": "C40", "name": "Latvian Gambit: Corkscrew Gambit" } } } } } } } }, "Nc6": { "_metadata": { "eco": "C40", "name": "Latvian Gambit: Fraser Defense" } }, "Qe7": { "_metadata": { "eco": "C40", "name": "Latvian Gambit: Greco Variation" } } }, "Bc4": { "fxe4": { "Nxe5": { "Qg5": { "Nf7": { "Qxg2": { "Rf1": { "d5": { "Nxh8": { "Nf6": { "_metadata": { "eco": "C40", "name": "Latvian Gambit: Behting Variation" } } } } } } }, "d4": { "Qxg2": { "_metadata": { "eco": "C40", "name": "Latvian Gambit: Mayet Attack, Poisoned Pawn Variation" } } } }, "Nf6": { "_metadata": { "eco": "C40", "name": "Latvian Gambit: Corkscrew Countergambit" } }, "d5": { "_metadata": { "eco": "C40", "name": "Latvian Gambit: Mayet Attack, Polerio-Svedenborg Variation" } } } }, "_metadata": { "eco": "C40", "name": "Latvian Gambit: Mayet Attack" }, "Nf6": { "_metadata": { "eco": "C40", "name": "Latvian Gambit: Mayet Attack, Morgado Defense" } }, "b5": { "_metadata": { "eco": "C40", "name": "Latvian Gambit: Mayet Attack, Strautins Gambit" } } }, "c4": { "_metadata": { "eco": "C40", "name": "Latvian Gambit: Diepstraten Countergambit" } }, "g4": { "_metadata": { "eco": "C40", "name": "Latvian Gambit: Lobster Gambit" } }, "d4": { "_metadata": { "eco": "C40", "name": "Latvian Gambit: Mason Countergambit" } }, "Nc3": { "_metadata": { "eco": "C40", "name": "Latvian Gambit: Mlotkowski Variation" } }, "b4": { "_metadata": { "eco": "C40", "name": "Latvian Gambit: Senechaud Gambit" } } }, "d6": { "_metadata": { "eco": "C41", "name": "Philidor Defense" }, "d4": { "_metadata": { "eco": "C41", "name": "Philidor Defense" }, "Bg4": { "dxe5": { "Nd7": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Albin-Blackburne Gambit" } } } }, "exd4": { "Nxd4": { "Nf6": { "Nc3": { "Be7": { "Be2": { "O-O": { "O-O": { "c5": { "Nf3": { "Nc6": { "Bg5": { "Be6": { "Re1": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Berger Variation" } } } } } } } } } } } }, "_metadata": { "eco": "C41", "name": "Philidor Defense: Exchange Variation" } }, "_metadata": { "eco": "C41", "name": "Philidor Defense: Exchange Variation" }, "g6": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Larsen Variation" } }, "d5": { "exd5": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Paulsen Attack" } } } }, "c3": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Bird Gambit" } }, "Qxd4": { "Bd7": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Boden Variation" } } }, "_metadata": { "eco": "C41", "name": "Philidor Defense: Exchange Variation" }, "Bc4": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Morphy Gambit" } } }, "Nd7": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Hanham Variation" }, "Bc4": { "c6": { "c3": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Hanham Variation, Delmar Variation" } }, "O-O": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Hanham Variation, Krause Variation" }, "Be7": { "dxe5": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Hanham Variation, Steiner Variation" } } } }, "Nc3": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Hanham Variation, Schlechter Variation" } }, "Ng5": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Hanham, Kmoch Variation" } } }, "Nb6": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Hanham Variation, Sharp Variation" } } }, "Nc3": { "Ngf6": { "g4": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Lion Variation, Shirov Gambit" } } } } }, "Nf6": { "Nc3": { "Nbd7": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Lion Variation" }, "Bc4": { "Be7": { "Bxf7+": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Lion Variation, Bishop Sacrifice" } }, "Ng5": { "O-O": { "Bxf7+": { "Rxf7": { "Ne6": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Lion Variation, Forcing Line" } } }, "_metadata": { "eco": "C41", "name": "Philidor Defense: Nimzowitsch, Larobok Variation" } } } }, "O-O": { "h6": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Lion Variation, Lion's Claw, with Bc4 and h6" } } } } }, "Be2": { "Be7": { "O-O": { "c6": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Lion Variation, Lion's Claw, with Be2 and c6" } } } } } } }, "_metadata": { "eco": "C41", "name": "Philidor Defense: Nimzowitsch Variation" }, "dxe5": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Nimzowitsch Variation" }, "Nxe4": { "Qd5": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Nimzowitsch Variation, Rellstab Variation" } }, "Nbd2": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Nimzowitsch Variation, Sokolsky Variation" } } } }, "Bc4": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Nimzowitsch Variation, Klein Variation" } }, "Ng5": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Nimzowitsch, Locock Variation" } } }, "f5": { "Bc4": { "exd4": { "Ng5": { "Nh6": { "Nxh7": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Lopez Countergambit, Jaenisch Variation" } } } } } }, "_metadata": { "eco": "C41", "name": "Philidor Defense: Philidor Countergambit" }, "dxe5": { "fxe4": { "Ng5": { "d5": { "e6": { "Bc5": { "Nc3": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Philidor Countergambit, Berger Variation" } } }, "_metadata": { "eco": "C41", "name": "Philidor Defense: Philidor Countergambit, del Rio Attack" } } } } } }, "Nc3": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Philidor Countergambit, Zukertort Variation" } } }, "Bd7": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Philidor Gambit" } } }, "Bc4": { "_metadata": { "eco": "C41", "name": "Philidor Defense" }, "Be7": { "_metadata": { "eco": "C41", "name": "Philidor Defense" }, "c3": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Steinitz Variation" } } }, "f5": { "_metadata": { "eco": "C41", "name": "Philidor Defense: Lopez Countergambit" } } } }, "Nc6": { "c4": { "Nf6": { "Nxe5": { "_metadata": { "eco": "C44", "name": "Dresden Opening: The Goblin" } } }, "_metadata": { "eco": "C44", "name": "King's Pawn Game: Dresden Opening" } }, "Nxe5": { "_metadata": { "eco": "C44", "name": "Irish Gambit" }, "Nxe5": { "d4": { "_metadata": { "eco": "C44", "name": "King's Pawn Game: Schulze-M\u00fcller Gambit" } } } }, "g3": { "_metadata": { "eco": "C44", "name": "King's Knight Opening: Konstantinopolsky" } }, "_metadata": { "eco": "C44", "name": "King's Knight Opening: Normal Variation" }, "b4": { "_metadata": { "eco": "C44", "name": "King's Pawn Game: Pachman Wing Gambit" } }, "Be2": { "_metadata": { "eco": "C44", "name": "King's Pawn Game: Tayler Opening" }, "Nf6": { "d4": { "_metadata": { "eco": "C44", "name": "King's Pawn Game: Tayler Opening" }, "exd4": { "e5": { "_metadata": { "eco": "C44", "name": "King's Pawn Game: Tayler Opening, Basman Gambit" } } } }, "d3": { "d5": { "Nbd2": { "_metadata": { "eco": "C44", "name": "King's Pawn Game: Tayler Opening, Inverted Hanham" } } } } } }, "d3": { "f5": { "exf5": { "_metadata": { "eco": "C44", "name": "Latvian Gambit: Clam Gambit" } } } }, "c3": { "_metadata": { "eco": "C44", "name": "Ponziani Opening" }, "d5": { "Qa4": { "Bd7": { "_metadata": { "eco": "C44", "name": "Ponziani Opening: Caro Gambit" } }, "Nf6": { "_metadata": { "eco": "C44", "name": "Ponziani Opening: Leonhardt Variation" } }, "f6": { "_metadata": { "eco": "C44", "name": "Ponziani Opening: Steinitz Variation" } } }, "Bb5": { "_metadata": { "eco": "C44", "name": "Ponziani Opening: Spanish Variation" }, "dxe4": { "Nxe5": { "Qd5": { "Qa4": { "_metadata": { "eco": "C44", "name": "Ponziani Opening: Spanish Variation, Harrwitz Attack, Nikitin Gambit" } } } } } } }, "Nf6": { "_metadata": { "eco": "C44", "name": "Ponziani Opening: Jaenisch Counterattack" }, "d3": { "_metadata": { "eco": "C44", "name": "Ponziani Opening: Jaenisch Counterattack" }, "d5": { "_metadata": { "eco": "C44", "name": "Ponziani Opening: Jaenisch Counterattack" }, "Nbd2": { "_metadata": { "eco": "C44", "name": "Ponziani Opening: Jaenisch Counterattack" } } } }, "Bc4": { "_metadata": { "eco": "C44", "name": "Ponziani Opening: Neumann Gambit" } }, "d4": { "Nxe4": { "d5": { "Bc5": { "_metadata": { "eco": "C44", "name": "Ponziani Opening: Vukovic Gambit" } } } } } }, "f5": { "_metadata": { "eco": "C44", "name": "Ponziani Opening: Ponziani Countergambit" }, "d4": { "d6": { "d5": { "_metadata": { "eco": "C44", "name": "Ponziani Opening: Ponziani Countergambit, Schmidt Attack" } } } } }, "Be7": { "_metadata": { "eco": "C44", "name": "Ponziani Opening: Romanishin Variation" } }, "Nge7": { "_metadata": { "eco": "C44", "name": "Ponziani Opening: R\u00fcti Variation" } } }, "d4": { "_metadata": { "eco": "C44", "name": "Scotch Game" }, "exd4": { "_metadata": { "eco": "C44", "name": "Scotch Game" }, "Bc4": { "Bb4+": { "c3": { "dxc3": { "bxc3": { "Ba5": { "e5": { "_metadata": { "eco": "C44", "name": "Scotch Game: Cochrane Variation" } } } }, "O-O": { "cxb2": { "Bxb2": { "Nf6": { "Ng5": { "O-O": { "e5": { "Nxe5": { "_metadata": { "eco": "C44", "name": "Scotch Game: Hanneken Variation" } } } } } } } } } } }, "_metadata": { "eco": "C44", "name": "Scotch Game: Scotch Gambit, London Defense" } }, "Bc5": { "Ng5": { "Nh6": { "Nxf7": { "Nxf7": { "Bxf7+": { "Kxf7": { "Qh5+": { "g6": { "Qxc5": { "d5": { "_metadata": { "eco": "C44", "name": "Scotch Game: Cochrane-Shumov Defense" } } } } } } } } }, "Qh5": { "_metadata": { "eco": "C44", "name": "Scotch Game: Vitzthum Attack" } } }, "_metadata": { "eco": "C44", "name": "Scotch Game: Scotch Gambit, Sarratt Variation" } }, "_metadata": { "eco": "C44", "name": "Scotch Game: Haxo Gambit" }, "O-O": { "d6": { "c3": { "Bg4": { "_metadata": { "eco": "C44", "name": "Scotch Game: Scotch Gambit, Cochrane-Anderssen Variation" } } } }, "Nf6": { "e5": { "d5": { "exf6": { "dxc4": { "Re1+": { "Be6": { "Ng5": { "g6": { "_metadata": { "eco": "C56", "name": "Italian Game: Two Knights Defense, Max Lange Attack, Loman Defense" } } } } } } } } } } }, "c3": { "Nf6": { "e5": { "d5": { "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation, Greco Gambit" } } } } } }, "_metadata": { "eco": "C44", "name": "Scotch Game: Scotch Gambit" }, "Nf6": { "e5": { "_metadata": { "eco": "C44", "name": "Scotch Game: Scotch Gambit, Advance Variation" } }, "O-O": { "Nxe4": { "Re1": { "d5": { "Nc3": { "_metadata": { "eco": "C56", "name": "Italian Game: Scotch Gambit, Canal Variation" } }, "Bxd5": { "Qxd5": { "Nc3": { "Qa5": { "Nxe4": { "Be6": { "Bg5": { "h6": { "1Bh4": { "g5": { "1Nf6+": { "Ke7": { "1b4": { "_metadata": { "eco": "C56", "name": "Italian Game: Two Knights Defense, Yurdansky Attack" } } } } } } } } } } } } } } } } }, "d6": { "_metadata": { "eco": "C56", "name": "Italian Game: Scotch Gambit, Janowski Defense" } }, "Bc5": { "_metadata": { "eco": "C56", "name": "Italian Game: Scotch Gambit, Max Lange Attack" }, "e5": { "d5": { "exf6": { "dxc4": { "Re1+": { "Be6": { "Ng5": { "Qd5": { "Nc3": { "Qf5": { "1Nce4": { "_metadata": { "eco": "C56", "name": "Italian Game: Scotch Gambit, Max Lange Attack, Long Variation" } } } } } } } } } } }, "Ng4": { "_metadata": { "eco": "C56", "name": "Italian Game: Scotch Gambit, Max Lange Attack, Spielmann Defense" } }, "_metadata": { "eco": "C56", "name": "Italian Game: Two Knights Defense, Max Lange Attack" } } }, "Be7": { "_metadata": { "eco": "C56", "name": "Italian Game: Scotch Gambit, de Riviere Defense" } } } } }, "c3": { "_metadata": { "eco": "C44", "name": "Scotch Game: G\u00f6ring Gambit" }, "dxc3": { "Bc4": { "Nf6": { "Nxc3": { "Bb4": { "_metadata": { "eco": "C44", "name": "Scotch Game: G\u00f6ring Gambit, Bardeleben Variation" } } } }, "_metadata": { "eco": "C44", "name": "Scotch Game: G\u00f6ring Gambit, Double Pawn Sacrifice" } }, "Nxc3": { "Bb4": { "_metadata": { "eco": "C44", "name": "Scotch Game: G\u00f6ring Gambit, Main Line" } }, "d6": { "Bc4": { "Bg4": { "O-O": { "Ne5": { "Nxe5": { "Bxd1": { "Bxf7+": { "Ke7": { "Nd5#": { "_metadata": { "eco": "C44", "name": "Scotch Game: Sea-Cadet Mate" } } } } } } } } } } } } }, "d5": { "_metadata": { "eco": "C44", "name": "Scotch Game: Scotch Gambit, G\u00f6ring Gambit Declined" } } }, "Bb5": { "_metadata": { "eco": "C44", "name": "Scotch Game: Relfsson Gambit" } }, "Nxd4": { "_metadata": { "eco": "C45", "name": "Scotch Game" }, "Qh4": { "Nb5": { "Bb4+": { "Bd2": { "_metadata": { "eco": "C45", "name": "Scotch Game" }, "Qxe4+": { "Be2": { "Kd8": { "O-O": { "Bxd2": { "Qxd2": { "_metadata": { "eco": "C45", "name": "Scotch Game: Horwitz Attack, Blackburne Variation" } }, "Nxd2": { "Qg6": { "_metadata": { "eco": "C45", "name": "Scotch Game: Rosenthal Variation" } } } } } } } } } }, "_metadata": { "eco": "C45", "name": "Scotch Game: Horwitz Attack" } }, "Be3": { "_metadata": { "eco": "C45", "name": "Scotch Game: Braune Variation" } }, "Nf3": { "_metadata": { "eco": "C45", "name": "Scotch Game: Fraser Variation" } }, "Nc3": { "Bb4": { "_metadata": { "eco": "C45", "name": "Scotch Game: Modern Defense" } }, "_metadata": { "eco": "C45", "name": "Scotch Game: Steinitz Variation" } }, "Nf5": { "_metadata": { "eco": "C45", "name": "Scotch Game: Paulsen Variation" } }, "_metadata": { "eco": "C45", "name": "Scotch Game: Steinitz Variation" } }, "Nf6": { "e5": { "_metadata": { "eco": "C45", "name": "Scotch Game: Alekhine Gambit" } }, "Nxc6": { "bxc6": { "e5": { "_metadata": { "eco": "C45", "name": "Scotch Game: Mieses Variation" } }, "Nd2": { "_metadata": { "eco": "C45", "name": "Scotch Game: Tartakower Variation" } } } }, "_metadata": { "eco": "C45", "name": "Scotch Game: Schmidt Variation" } }, "Bc5": { "Be3": { "Qf6": { "Nb5": { "_metadata": { "eco": "C45", "name": "Scotch Game: Blumenfeld Attack" } }, "c3": { "Nge7": { "Qd2": { "_metadata": { "eco": "C45", "name": "Scotch Game: Classical Variation, Blackburne Attack" }, "d5": { "Nb5": { "Bxe3": { "Qxe3": { "O-O": { "Nxc7": { "Rb8": { "1Nxd5": { "Nxd5": { "1exd5": { "Nb4": { "_metadata": { "eco": "C45", "name": "Scotch Game: Gottschall Variation" } } } } } } } } } } } } }, "Nc2": { "_metadata": { "eco": "C45", "name": "Scotch Game: Meitner Variation" } }, "Bb5": { "_metadata": { "eco": "C45", "name": "Scotch Game: Paulsen Attack" }, "Nd8": { "_metadata": { "eco": "C45", "name": "Scotch Game: Paulsen, Gunsberg Defense" } } } }, "Qg6": { "_metadata": { "eco": "C45", "name": "Scotch Game: Classical Variation, Millennium Variation" } } } } }, "_metadata": { "eco": "C45", "name": "Scotch Game: Classical Variation" }, "Nxc6": { "Qf6": { "_metadata": { "eco": "C45", "name": "Scotch Game: Classical Variation, Intermezzo Variation" } } }, "Nb3": { "_metadata": { "eco": "C45", "name": "Scotch Game: Potter Variation" }, "Bb4+": { "_metadata": { "eco": "C45", "name": "Scotch Game: Romanishin Variation" } } } }, "Nxd4": { "Qxd4": { "d6": { "Bd3": { "_metadata": { "eco": "C45", "name": "Scotch Game: Ghulam-Kassim Variation" } } } } }, "Bb4+": { "_metadata": { "eco": "C45", "name": "Scotch Game: Malaniuk Variation" } } } }, "Nxd4": { "_metadata": { "eco": "C44", "name": "Scotch Game: Lolli Variation" }, "Nxd4": { "exd4": { "Qxd4": { "_metadata": { "eco": "C44", "name": "Scotch Game: Lolli Variation" } }, "Bc4": { "_metadata": { "eco": "C44", "name": "Scotch Game: Napoleon Gambit" } } } } } }, "Bc4": { "Be7": { "d4": { "exd4": { "_metadata": { "eco": "C44", "name": "Scotch Game: Benima Defense" }, "c3": { "Nf6": { "e5": { "Ne4": { "_metadata": { "eco": "C50", "name": "Italian Game: Hungarian Defense, Tartakower Variation" } } } } } } }, "_metadata": { "eco": "C50", "name": "Italian Game: Hungarian Defense" } }, "Nf6": { "d4": { "exd4": { "_metadata": { "eco": "C44", "name": "Scotch Game: Scotch Gambit, Dubois R\u00fcti Defense" }, "e5": { "Ng4": { "_metadata": { "eco": "C44", "name": "Scotch Game: Scotch Gambit, Kingside Variation" } }, "d5": { "Bb5": { "Ne4": { "_metadata": { "eco": "C56", "name": "Italian Game: Scotch Gambit, Max Lange Attack" }, "Nxd4": { "Bc5": { "Nxc6": { "Bxf2+": { "Kf1": { "Qh4": { "_metadata": { "eco": "C56", "name": "Italian Game: Two Knights Defense, Keidansky Variation" } } } } } } } } } } }, "O-O": { "_metadata": { "eco": "C56", "name": "Italian Game: Scotch Gambit" }, "Nxe4": { "Re1": { "d5": { "Bxd5": { "Qxd5": { "Nc3": { "_metadata": { "eco": "C56", "name": "Italian Game: Scotch Gambit, Anderssen Attack" }, "Qa5": { "Nxe4": { "Be6": { "Bd2": { "Qd5": { "1Bg5": { "_metadata": { "eco": "C56", "name": "Italian Game: Scotch Gambit, Anderssen Attack, Main Line" } } } } } } } } } } } }, "_metadata": { "eco": "C56", "name": "Italian Game: Scotch Gambit, Double Gambit Accepted" }, "Nc3": { "_metadata": { "eco": "C56", "name": "Italian Game: Scotch Gambit, Nakhmanson Gambit" } } }, "Bc5": { "e5": { "d5": { "exf6": { "dxc4": { "Re1+": { "Be6": { "Ng5": { "Qd5": { "Nc3": { "Qf5": { "1g4": { "Qg6": { "1Nce4": { "Bb6": { "1f4": { "O-O-O": { "_metadata": { "eco": "C56", "name": "Italian Game: Two Knights Defense, Max Lange Attack, Berger Variation" } } } } } } }, "1Nce4": { "Bf8": { "_metadata": { "eco": "C56", "name": "Italian Game: Two Knights Defense, Max Lange Attack, Rubinstein Variation" } } } } } } } } } } } }, "Ng4": { "c3": { "_metadata": { "eco": "C56", "name": "Italian Game: Two Knights Defense, Max Lange Attack, Krause Variation" } } } } } }, "Ng5": { "_metadata": { "eco": "C56", "name": "Italian Game: Two Knights Defense, Perreux Variation" } } }, "d6": { "_metadata": { "eco": "C56", "name": "Italian Game: Scotch Invitation Declined" } }, "_metadata": { "eco": "C56", "name": "Italian Game: Two Knights Defense, Open Variation" } }, "Nc3": { "_metadata": { "eco": "C47", "name": "Four Knights Game: Italian Variation" }, "Nxe4": { "Bxf7+": { "_metadata": { "eco": "C47", "name": "Four Knights Game: Italian Variation, Noa Gambit" } } } }, "O-O": { "Bc5": { "Nc3": { "d6": { "d3": { "_metadata": { "eco": "C50", "name": "Italian Game: Giuoco Pianissimo" } } } }, "d4": { "Bxd4": { "Nxd4": { "Nxd4": { "Bg5": { "d6": { "f4": { "Qe7": { "fxe5": { "dxe5": { "Nc3": { "_metadata": { "eco": "C54", "name": "Italian Game: Giuoco Piano, Holzhausen Attack" } } } } } }, "_metadata": { "eco": "C55", "name": "Italian Game: Two Knights Defense" } }, "h6": { "Bh4": { "g5": { "f4": { "_metadata": { "eco": "C54", "name": "Italian Game: Giuoco Piano, Rosentreter Variation" } } } } } } } } } } } }, "d3": { "Bc5": { "_metadata": { "eco": "C50", "name": "Italian Game: Giuoco Pianissimo, Normal" } }, "_metadata": { "eco": "C55", "name": "Italian Game: Two Knights Defense, Modern Bishop's Opening" }, "Be7": { "_metadata": { "eco": "C55", "name": "Italian Game: Two Knights Defense, Modern Bishop's Opening" } } }, "_metadata": { "eco": "C55", "name": "Italian Game: Two Knights Defense" }, "Ng5": { "d5": { "exd5": { "Nxd5": { "Nxf7": { "Kxf7": { "Qf3+": { "Ke6": { "Nc3": { "Nb4": { "Qe4": { "c6": { "a3": { "Na6": { "1d4": { "Nc7": { "_metadata": { "eco": "C57", "name": "Italian Game: Two Knights Defense, Fegatello Attack, Leonhardt Variation" } } } } } } } } } } } }, "_metadata": { "eco": "C57", "name": "Italian Game: Two Knights Defense, Fried Liver Attack" } }, "d4": { "_metadata": { "eco": "C57", "name": "Italian Game: Two Knights Defense, Lolli Attack" }, "Bb4+": { "_metadata": { "eco": "C57", "name": "Italian Game: Two Knights Defense, Pincus Variation" } } } }, "Nd4": { "_metadata": { "eco": "C57", "name": "Italian Game: Two Knights Defense, Fritz Variation" }, "c3": { "b5": { "Bf1": { "Nxd5": { "Ne4": { "_metadata": { "eco": "C57", "name": "Italian Game: Two Knights Defense, Fritz, Gruber Variation" } } } } } } }, "Nb4": { "_metadata": { "eco": "C57", "name": "Italian Game: Two Knights Defense, Kloss Gambit" } }, "b5": { "_metadata": { "eco": "C57", "name": "Italian Game: Two Knights Defense, Ulvestad Variation" }, "Bf1": { "h6": { "Nxf7": { "_metadata": { "eco": "C57", "name": "Italian Game: Two Knights Defense, Ulvestad Variation, Kurkin Gambit" } } } } }, "Na5": { "Bb5+": { "c6": { "dxc6": { "bxc6": { "Be2": { "_metadata": { "eco": "C58", "name": "Italian Game: Two Knights Defense" }, "h6": { "Nf3": { "e4": { "Ne5": { "Bd6": { "1d4": { "Qc7": { "1Bd2": { "_metadata": { "eco": "C59", "name": "Italian Game: Two Knights Defense, Knorre Variation" } } } } }, "Qc7": { "_metadata": { "eco": "C59", "name": "Italian Game: Two Knights Defense, Polerio Defense, G\u00f6ring Variation" } } } } }, "_metadata": { "eco": "C59", "name": "Italian Game: Two Knights Defense, Polerio Defense, Suhle Defense" }, "Nh3": { "_metadata": { "eco": "C59", "name": "Italian Game: Two Knights Defense, Steinitz Variation" } } } }, "Qf3": { "cxb5": { "_metadata": { "eco": "C58", "name": "Italian Game: Two Knights Defense, Blackburne Variation" } }, "Rb8": { "_metadata": { "eco": "C58", "name": "Italian Game: Two Knights Defense, Colman Variation" } }, "Qc7": { "Bd3": { "_metadata": { "eco": "C58", "name": "Italian Game: Two Knights Defense, Paoli Variation" } } }, "_metadata": { "eco": "C58", "name": "Italian Game: Two Knights Defense, Polerio Defense, Bogoljubow Variation" } } } } }, "_metadata": { "eco": "C58", "name": "Italian Game: Two Knights Defense, Polerio Defense, Bishop Check Line" } }, "d3": { "h6": { "Nf3": { "e4": { "Qe2": { "Nxc4": { "dxc4": { "Be7": { "_metadata": { "eco": "C58", "name": "Italian Game: Two Knights Defense, Mar\u00f3czy Variation" } }, "Bc5": { "Nfd2": { "_metadata": { "eco": "C58", "name": "Italian Game: Two Knights Defense, Polerio Defense, Yankovich Variation" } } } } } } } } }, "_metadata": { "eco": "C58", "name": "Italian Game: Two Knights Defense, Polerio Defense, Kieseritzky Variation" } }, "_metadata": { "eco": "C58", "name": "Italian Game: Two Knights Defense, Polerio Defense" } } }, "_metadata": { "eco": "C57", "name": "Italian Game: Two Knights Defense, Knight Attack, Normal Variation" } }, "_metadata": { "eco": "C57", "name": "Italian Game: Two Knights Defense, Knight Attack" }, "Nxe4": { "_metadata": { "eco": "C57", "name": "Italian Game: Two Knights Defense, Ponziani-Steinitz Gambit" } }, "Bc5": { "_metadata": { "eco": "C57", "name": "Italian Game: Two Knights Defense, Traxler Counterattack" }, "Bxf7+": { "_metadata": { "eco": "C57", "name": "Italian Game: Two Knights Defense, Traxler Counterattack, Bishop Sacrifice Line" }, "Ke7": { "d4": { "_metadata": { "eco": "C57", "name": "Italian Game: Two Knights Defense, Traxler Variation, Trencianske-Teplice Gambit" } } } }, "Nxf7": { "Bxf2+": { "Kxf2": { "Nxe4+": { "Ke3": { "_metadata": { "eco": "C57", "name": "Italian Game: Two Knights Defense, Traxler Counterattack, King March Line" } } } } }, "_metadata": { "eco": "C57", "name": "Italian Game: Two Knights Defense, Traxler Counterattack, Knight Sacrifice Line" } } } } }, "Bc5": { "Nc3": { "Nf6": { "_metadata": { "eco": "C50", "name": "Four Knights Game: Italian Variation" } } }, "O-O": { "Nf6": { "c3": { "_metadata": { "eco": "C50", "name": "Italian Game: Classical Variation, Albin Gambit" } }, "d4": { "_metadata": { "eco": "C50", "name": "Italian Game: Deutz Gambit" }, "exd4": { "e5": { "d5": { "exf6": { "dxc4": { "Re1+": { "Be6": { "fxg7": { "_metadata": { "eco": "C56", "name": "Italian Game: Scotch Gambit, Max Lange Attack Accepted" } } } } } } } } } }, "d3": { "h6": { "c3": { "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation, Giuoco Pianissimo" }, "d6": { "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation, Giuoco Pianissimo, with h6" } } }, "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation, Giuoco Pianissimo, with h6" } }, "d6": { "c3": { "a6": { "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation, Giuoco Pianissimo" } } } }, "a5": { "c3": { "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation, Giuoco Pianissimo, with a5" } } } } } }, "d3": { "_metadata": { "eco": "C50", "name": "Italian Game: Giuoco Pianissimo" }, "Nf6": { "Nc3": { "d6": { "Bg5": { "_metadata": { "eco": "C50", "name": "Italian Game: Giuoco Pianissimo, Canal Variation" } } }, "_metadata": { "eco": "C50", "name": "Italian Game: Giuoco Pianissimo, Italian Four Knights Variation" } } }, "f5": { "Ng5": { "f4": { "_metadata": { "eco": "C50", "name": "Italian Game: Giuoco Pianissimo, Dubois Variation" } } }, "_metadata": { "eco": "C50", "name": "Italian Game: Giuoco Pianissimo, Lucchini Gambit" } } }, "_metadata": { "eco": "C50", "name": "Italian Game: Giuoco Piano" }, "Bxf7+": { "_metadata": { "eco": "C50", "name": "Italian Game: Jerome Gambit" } }, "d4": { "_metadata": { "eco": "C50", "name": "Italian Game: Rosentreter Gambit" } }, "b4": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit" }, "Bxb4": { "c3": { "Bc5": { "d4": { "exd4": { "O-O": { "d6": { "cxd4": { "Bb6": { "Nc3": { "Bg4": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit" }, "Qa4": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit, Fraser Attack" }, "Bd7": { "1Qb3": { "Na5": { "1Bxf7+": { "Kf8": { "1Qc2": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit, Fraser-Mortimer Attack" }, "Kxf7": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit, Mortimer-Evans Gambit" } } } } } } } } } }, "Na5": { "Bg5": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit, G\u00f6ring Attack" }, "f6": { "1Be3": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit, Steinitz Variation" } } } } } }, "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit, McDonnell Defense, Main Line" }, "d5": { "Na5": { "Bb2": { "Ne7": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit, Paulsen Variation" } }, "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit, Ulvestad Variation" } } } } } } } }, "cxd4": { "Bb4+": { "Bd2": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit, Harding Variation" } } } } } }, "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit, McDonnell Defense" } }, "Be7": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit, Anderssen Variation" }, "d4": { "Na5": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit, Anderssen Variation, Cordel Line" } } } }, "Bf8": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit, Mayet Defense" } }, "Ba5": { "d4": { "exd4": { "O-O": { "d6": { "cxd4": { "Bb6": { "Nc3": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit, Morphy Attack" } } } }, "Qb3": { "_metadata": { "eco": "C52", "name": "Italian Game: Evans Gambit, Waller Attack" } } }, "dxc3": { "_metadata": { "eco": "C52", "name": "Italian Game: Evans Gambit, Compromised Defense" }, "Qb3": { "Qf6": { "e5": { "Qg6": { "Nxc3": { "Nge7": { "1Ba3": { "_metadata": { "eco": "C52", "name": "Italian Game: Evans Gambit, Compromised Defense, Main Line" } }, "1Rd1": { "_metadata": { "eco": "C52", "name": "Italian Game: Evans Gambit, Compromised Defense, Potter Variation" } } } } } } } } }, "d3": { "_metadata": { "eco": "C52", "name": "Italian Game: Evans Gambit, Dufresne Defense" } }, "b5": { "_metadata": { "eco": "C52", "name": "Italian Game: Evans Gambit, Johner Defense" } }, "Nge7": { "_metadata": { "eco": "C52", "name": "Italian Game: Evans Gambit, Mieses Defense" } } }, "_metadata": { "eco": "C52", "name": "Italian Game: Evans Gambit, Pierce Defense" } }, "d6": { "_metadata": { "eco": "C52", "name": "Italian Game: Evans Gambit, Bronstein Defense" }, "Qb3": { "Qd7": { "dxe5": { "dxe5": { "O-O": { "Bb6": { "Ba3": { "Na5": { "1Nxe5": { "_metadata": { "eco": "C52", "name": "Italian Game: Evans Gambit, Levenfish Variation" } } } } } } } } }, "_metadata": { "eco": "C52", "name": "Italian Game: Evans Gambit, Tartakower Attack" } }, "Bg5": { "_metadata": { "eco": "C52", "name": "Italian Game: Evans Gambit, Sokolsky Variation" } } }, "Nf6": { "_metadata": { "eco": "C52", "name": "Italian Game: Evans Gambit, Laroche Variation" } }, "b5": { "_metadata": { "eco": "C52", "name": "Italian Game: Evans Gambit, Leonhardt Countergambit" } } }, "O-O": { "d6": { "_metadata": { "eco": "C52", "name": "Italian Game: Evans Gambit" }, "d4": { "Bg4": { "_metadata": { "eco": "C52", "name": "Italian Game: Evans Gambit, Alapin-Steinitz Variation" } }, "Bb6": { "_metadata": { "eco": "C52", "name": "Italian Game: Evans Gambit, Lasker Defense" } }, "Bd7": { "_metadata": { "eco": "C52", "name": "Italian Game: Evans Gambit, Sanders-Alapin Variation" } } } }, "Nf6": { "d4": { "exd4": { "_metadata": { "eco": "C52", "name": "Italian Game: Evans Gambit, Anderssen Defense" } }, "O-O": { "Nxe5": { "_metadata": { "eco": "C52", "name": "Italian Game: Evans Gambit, Richardson Attack" } } } } }, "_metadata": { "eco": "C52", "name": "Italian Game: Evans Gambit, Slow Variation" } }, "_metadata": { "eco": "C52", "name": "Italian Game: Evans Gambit, Main Line" } }, "Bd6": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit, Stone-Ware Variation" } } }, "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit Accepted" } }, "Bb6": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit Declined" }, "a4": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit Declined" }, "a6": { "Nc3": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit Declined, Showalter Variation" } } } }, "Bb2": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit Declined, Cordel Variation" } }, "b5": { "Na5": { "Nxe5": { "Qg5": { "Qf3": { "Qxe5": { "Qxf7+": { "Kd8": { "Bb2": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit Declined, Hicken Variation" } } } } } }, "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit Declined, Hirschbach Variation" }, "Bxf7+": { "Ke7": { "Qh5": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit Declined, Vasquez Variation" } } } } }, "Nh6": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit Declined, Lange Variation" }, "d4": { "d6": { "Bxh6": { "dxe5": { "Bxg7": { "Rg8": { "Bxf7+": { "Kxf7": { "1Bxe5": { "Qg5": { "1Nd2": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit Declined, Pavlov Variation" } } } } } } } } } } } } } } } } }, "b5": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit, Fontaine Countergambit" } }, "d5": { "_metadata": { "eco": "C51", "name": "Italian Game: Evans Gambit, Hein Countergambit" } } }, "c3": { "Nf6": { "b4": { "_metadata": { "eco": "C53", "name": "Italian Game: Bird's Attack" } }, "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation" }, "d4": { "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation, Center Attack" }, "exd4": { "e5": { "Ne4": { "Bd5": { "Nxf2": { "Kxf2": { "dxc3+": { "Kg3": { "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation, Ghulam-Kassim Variation" } } } } } } }, "d5": { "Bb5": { "Ne4": { "cxd4": { "Bb4+": { "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation, Greco Gambit, Anderssen Variation" } } } } } } }, "cxd4": { "Bb4+": { "Nc3": { "Nxe4": { "O-O": { "Nxc3": { "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation, Greco Gambit, Greco Variation" }, "bxc3": { "Bxc3": { "Ba3": { "_metadata": { "eco": "C54", "name": "Italian Game: Giuoco Piano, Aitken Variation" } }, "Qb3": { "d5": { "_metadata": { "eco": "C54", "name": "Italian Game: Giuoco Piano, Bernstein Variation" } } } } } }, "Bxc3": { "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation, Greco Gambit, Main Line" }, "d5": { "Bf6": { "Re1": { "Ne7": { "1Rxe4": { "d6": { "1g4": { "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation, Greco Gambit, Moeller-Bayonet Attack" } }, "1Bg5": { "Bxg5": { "1Nxg5": { "O-O": { "1Nxh7": { "_metadata": { "eco": "C54", "name": "Italian Game: Giuoco Piano, Therkatz-Herzog Variation" } } } } } } } } } } }, "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation, Greco Gambit, Moeller-Therkatz Attack" } }, "bxc3": { "d5": { "Ba3": { "_metadata": { "eco": "C54", "name": "Italian Game: Giuoco Piano, Steinitz Variation" } } } } } } }, "_metadata": { "eco": "C54", "name": "Italian Game: Giuoco Piano, Greco's Attack" } }, "Kf1": { "_metadata": { "eco": "C54", "name": "Italian Game: Giuoco Piano, Cracow Variation" } }, "Bd2": { "Nxe4": { "Bxb4": { "Nxb4": { "Bxf7+": { "Kxf7": { "Qb3+": { "d5": { "1Ne5+": { "Kf6": { "1f3": { "_metadata": { "eco": "C54", "name": "Italian Game: Giuoco Piano, Krause Variation" } } } } } } } } } } } } }, "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation, Greco Gambit, Traditional Line" } }, "O-O": { "_metadata": { "eco": "C56", "name": "Italian Game: Scotch Gambit, Walbrodt-Baird Gambit" } } } }, "d3": { "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation, Giuoco Pianissimo" }, "d6": { "Nbd2": { "O-O": { "O-O": { "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation, Giuoco Pianissimo" } } }, "a6": { "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation, Giuoco Pianissimo, with a6" } } }, "O-O": { "O-O": { "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation, Giuoco Pianissimo" }, "Re1": { "a6": { "Bb3": { "Ba7": { "h3": { "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation, Giuoco Pianissimo, Main Line" } } } } } } } }, "b4": { "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation, Giuoco Pianissimo, Albin Variation" } }, "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation, Giuoco Pianissimo, with d6" } }, "a6": { "_metadata": { "eco": "C54", "name": "Italian Game: Classical Variation, Giuoco Pianissimo, with a6" } } } }, "_metadata": { "eco": "C53", "name": "Italian Game: Classical Variation" }, "Qe7": { "d4": { "Bb6": { "_metadata": { "eco": "C53", "name": "Italian Game: Classical Variation, Center Holding Variation" }, "d5": { "Nb8": { "d6": { "_metadata": { "eco": "C53", "name": "Italian Game: Classical Variation, Eisinger Variation" } } } }, "Bg5": { "_metadata": { "eco": "C53", "name": "Italian Game: Classical Variation, Mestel Variation" } }, "O-O": { "d6": { "a4": { "a6": { "h3": { "Nf6": { "Re1": { "_metadata": { "eco": "C53", "name": "Italian Game: Classical Variation, Tarrasch Variation" } } } } } } } } } }, "_metadata": { "eco": "C53", "name": "Italian Game: Classical Variation, Closed Variation" } }, "d6": { "d4": { "exd4": { "cxd4": { "Bb6": { "_metadata": { "eco": "C53", "name": "Italian Game: Classical Variation, La Bourdonnais Variation" } } } } } } } }, "_metadata": { "eco": "C50", "name": "Italian Game" }, "h6": { "_metadata": { "eco": "C50", "name": "Italian Game: Anti-Fried Liver Defense" } }, "Nd4": { "_metadata": { "eco": "C50", "name": "Italian Game: Blackburne-Kostic Gambit" } }, "d6": { "_metadata": { "eco": "C50", "name": "Italian Game: Paris Defense" } }, "f5": { "_metadata": { "eco": "C50", "name": "Italian Game: Rousseau Gambit" } } }, "Nc3": { "_metadata": { "eco": "C46", "name": "Three Knights Opening" }, "Bb4": { "_metadata": { "eco": "C46", "name": "Three Knights Opening" }, "Nd5": { "Nf6": { "_metadata": { "eco": "C46", "name": "Three Knights Opening: Schlechter Variation" } } } }, "g6": { "_metadata": { "eco": "C46", "name": "Three Knights Opening: Steinitz Defense" }, "d4": { "exd4": { "Nd5": { "_metadata": { "eco": "C46", "name": "Three Knights Opening: Steinitz-Rosenthal Variation" } } } } }, "f5": { "_metadata": { "eco": "C46", "name": "Three Knights Opening: Winawer Defense" } }, "Nf6": { "_metadata": { "eco": "C47", "name": "Four Knights Game" }, "g3": { "_metadata": { "eco": "C47", "name": "Four Knights Game: Glek System" } }, "a3": { "_metadata": { "eco": "C47", "name": "Four Knights Game: Gunsberg Variation" } }, "Nxe5": { "_metadata": { "eco": "C47", "name": "Four Knights Game: Halloween Gambit" }, "Nxe5": { "d4": { "Ng6": { "e5": { "Ng8": { "Bc4": { "Bb4": { "Qf3": { "f5": { "_metadata": { "eco": "C47", "name": "Four Knights Game: Halloween Gambit, Oldtimer Variation" } } } } } } } }, "Nc6": { "d5": { "Ne5": { "f4": { "Ng6": { "e5": { "Ng8": { "d6": { "cxd6": { "exd6": { "Qf6": { "1Nb5": { "Rb8": { "_metadata": { "eco": "C47", "name": "Four Knights Game: Halloween Gambit, Plasma Variation" } } } } } } } } } } } } } } } } }, "d4": { "_metadata": { "eco": "C47", "name": "Four Knights Game: Scotch Variation" }, "exd4": { "_metadata": { "eco": "C47", "name": "Four Knights Game: Scotch Variation Accepted" }, "Nd5": { "_metadata": { "eco": "C47", "name": "Four Knights Game: Scotch Variation, Belgrade Gambit" }, "Nxe4": { "Qe2": { "f5": { "_metadata": { "eco": "C47", "name": "Four Knights Game: Scotch Variation, Belgrade Gambit, Modern Defense" } } } } }, "Nxd4": { "Nxe4": { "_metadata": { "eco": "C47", "name": "Four Knights Game: Scotch Variation, Schmid Defense" } } } }, "Bb4": { "Nxe5": { "_metadata": { "eco": "C47", "name": "Four Knights Game: Scotch Variation, Krause Gambit" }, "Qe7": { "_metadata": { "eco": "C47", "name": "Four Knights Game: Scotch Variation, Krause Gambit, Leonhardt Defense" } } }, "d5": { "Nd4": { "_metadata": { "eco": "C47", "name": "Four Knights Game: Scotch Variation, Oxford Gambit" } } } } }, "Bb5": { "_metadata": { "eco": "C48", "name": "Four Knights Game: Spanish Variation" }, "Bc5": { "O-O": { "O-O": { "Nxe5": { "Nxe5": { "d4": { "Bd6": { "f4": { "Nc6": { "e5": { "Bb4": { "_metadata": { "eco": "C48", "name": "Four Knights Game: Spanish Variation, Bardeleben Variation" } } } } } } } } } } }, "_metadata": { "eco": "C48", "name": "Four Knights Game: Spanish Variation, Classical Variation" } }, "a6": { "Bxc6": { "_metadata": { "eco": "C48", "name": "Four Knights Game: Spanish Variation, Ranken Variation" }, "dxc6": { "Nxe5": { "Nxe4": { "Nxe4": { "Qd4": { "O-O": { "Qxe5": { "Re1": { "Be6": { "d4": { "Qd5": { "_metadata": { "eco": "C48", "name": "Four Knights Game: Spanish Variation, Spielmann Variation" } } } } } } } } } } } } } }, "Nd4": { "_metadata": { "eco": "C48", "name": "Four Knights Game: Spanish Variation, Rubinstein Variation" }, "Be2": { "_metadata": { "eco": "C48", "name": "Four Knights Game: Spanish Variation, Rubinstein Variation" }, "Nxf3+": { "Bxf3": { "Bc5": { "O-O": { "O-O": { "d3": { "d6": { "Na4": { "Bb6": { "_metadata": { "eco": "C48", "name": "Four Knights Game: Spanish Variation, Rubinstein Variation, Mar\u00f3czy Variation" } } } } } } } } } } }, "Nxd4": { "_metadata": { "eco": "C48", "name": "Four Knights Game: Spanish Variation, Rubinstein Variation Accepted" } }, "Ba4": { "Bc5": { "Nxe5": { "O-O": { "_metadata": { "eco": "C48", "name": "Four Knights Game: Spanish Variation, Rubinstein Variation, Marshall Gambit" } } } } }, "Nxe5": { "Bc5": { "O-O": { "O-O": { "_metadata": { "eco": "C48", "name": "Four Knights Game: Spanish Variation, Rubinstein Variation, Marshall Variation" } } } } } }, "Bb4": { "O-O": { "O-O": { "d3": { "Bxc3": { "_metadata": { "eco": "C49", "name": "Four Knights Game: Spanish Variation" }, "bxc3": { "d6": { "Re1": { "_metadata": { "eco": "C49", "name": "Four Knights Game: Spanish Variation, Janowski Variation" } } }, "d5": { "_metadata": { "eco": "C49", "name": "Four Knights Game: Spanish Variation, Svenonius Variation" } } } }, "Qe7": { "Ne2": { "d5": { "_metadata": { "eco": "C49", "name": "Four Knights Game: Spanish Variation, Alatortsev Variation" } } } }, "_metadata": { "eco": "C49", "name": "Four Knights Game: Spanish Variation, Double Spanish" }, "d6": { "_metadata": { "eco": "C49", "name": "Four Knights Game: Spanish Variation, Symmetrical Variation" }, "Bg5": { "Bxc3": { "bxc3": { "Qe7": { "Re1": { "Nd8": { "d4": { "Bg4": { "_metadata": { "eco": "C49", "name": "Four Knights Game: Spanish Variation, Symmetrical Variation" } } } } }, "_metadata": { "eco": "C49", "name": "Four Knights Game: Spanish Variation, Symmetrical Variation, Metger Unpin" } } } }, "Ne7": { "_metadata": { "eco": "C49", "name": "Four Knights Game: Spanish Variation, Symmetrical Variation" }, "Nh4": { "c6": { "Bc4": { "d5": { "Bb3": { "Qd6": { "_metadata": { "eco": "C49", "name": "Four Knights Game: Spanish Variation, Symmetrical Variation, Blake Variation" } } } } } } } } }, "Ne2": { "_metadata": { "eco": "C49", "name": "Four Knights Game: Spanish Variation, Symmetrical Variation" } } } }, "Bxc6": { "_metadata": { "eco": "C49", "name": "Four Knights Game: Spanish Variation, Nimzowitsch Variation" } } } }, "_metadata": { "eco": "C49", "name": "Four Knights Game: Spanish Variation, Double Spanish" } } } } }, "Bb5": { "_metadata": { "eco": "C60", "name": "Ruy Lopez" }, "Bb4": { "_metadata": { "eco": "C60", "name": "Ruy Lopez: Alapin Defense" }, "c3": { "Ba5": { "Bxc6": { "dxc6": { "_metadata": { "eco": "C60", "name": "Ruy Lopez: Alapin Defense, Alapin Gambit" } } } } } }, "g5": { "_metadata": { "eco": "C60", "name": "Ruy Lopez: Brentano Gambit" } }, "a5": { "_metadata": { "eco": "C60", "name": "Ruy Lopez: Bulgarian Variation" } }, "Nge7": { "_metadata": { "eco": "C60", "name": "Ruy Lopez: Cozio Defense" }, "Nc3": { "g6": { "_metadata": { "eco": "C60", "name": "Ruy Lopez: Cozio Defense, Paulsen Variation" } } } }, "g6": { "d4": { "exd4": { "Nxd4": { "Bg7": { "Be3": { "Nge7": { "Nc3": { "O-O": { "Qd2": { "d5": { "_metadata": { "eco": "C60", "name": "Ruy Lopez: Cozio Defense, Tartakower Gambit" } } } } } } } } } } }, "_metadata": { "eco": "C60", "name": "Ruy Lopez: Fianchetto Defense" }, "c3": { "f5": { "_metadata": { "eco": "C60", "name": "Ruy Lopez: Fianchetto Defense, Kevitz Gambit" } }, "a6": { "Ba4": { "d6": { "d4": { "Bd7": { "_metadata": { "eco": "C76", "name": "Ruy Lopez: Morphy Defense, Modern Steinitz Defense, Fianchetto Variation" } } } } } } } }, "Be7": { "_metadata": { "eco": "C60", "name": "Ruy Lopez: Lucena Variation" } }, "f6": { "_metadata": { "eco": "C60", "name": "Ruy Lopez: N\u00fcrnberg Variation" } }, "Na5": { "_metadata": { "eco": "C60", "name": "Ruy Lopez: Pollock Defense" } }, "Nb8": { "_metadata": { "eco": "C60", "name": "Ruy Lopez: Retreat Variation" } }, "b6": { "_metadata": { "eco": "C60", "name": "Ruy Lopez: Rotary-Albany Gambit" } }, "d5": { "_metadata": { "eco": "C60", "name": "Ruy Lopez: Spanish Countergambit" }, "Nxe5": { "Qg5": { "O-O": { "_metadata": { "eco": "C60", "name": "Ruy Lopez: Spanish Countergambit, Harding Countergambit, Fricke Gambit" } }, "Nxc6": { "_metadata": { "eco": "C60", "name": "Ruy Lopez: Spanish Countergambit, Harding Gambit" } } } } }, "Qe7": { "_metadata": { "eco": "C60", "name": "Ruy Lopez: Vinogradov Variation" } }, "Nd4": { "_metadata": { "eco": "C61", "name": "Ruy Lopez: Bird Variation" }, "Nxd4": { "exd4": { "O-O": { "Ne7": { "_metadata": { "eco": "C61", "name": "Ruy Lopez: Bird Variation, Paulsen Variation" } } } } } }, "d6": { "d4": { "Bd7": { "c4": { "_metadata": { "eco": "C62", "name": "Ruy Lopez: Old Steinitz Defense, Semi-Duras Variation" } }, "Nc3": { "Nf6": { "Bxc6": { "_metadata": { "eco": "C62", "name": "Ruy Lopez: Steinitz Defense, Nimzowitsch Attack" } }, "O-O": { "Be7": { "Re1": { "O-O": { "_metadata": { "eco": "C66", "name": "Ruy Lopez: Berlin Defense, Tarrasch Trap" } } } } } } } }, "exd4": { "O-O": { "_metadata": { "eco": "C62", "name": "Ruy Lopez: Steinitz Defense, Center Gambit" } } } }, "_metadata": { "eco": "C62", "name": "Ruy Lopez: Steinitz Defense" } }, "f5": { "_metadata": { "eco": "C63", "name": "Ruy Lopez: Schliemann Defense" }, "Nc3": { "fxe4": { "Nxe4": { "d5": { "Nxe5": { "dxe4": { "Nxc6": { "Qg5": { "_metadata": { "eco": "C63", "name": "Ruy Lopez: Schliemann Defense, Classical Variation" } }, "Qd5": { "_metadata": { "eco": "C63", "name": "Ruy Lopez: Schliemann Defense, M\u00f6hring Variation" } } } } } }, "Be7": { "_metadata": { "eco": "C63", "name": "Ruy Lopez: Schliemann Defense, Kosti\u0107 Defense" } }, "Nf6": { "_metadata": { "eco": "C63", "name": "Ruy Lopez: Schliemann Defense, Tartakower Variation" } } } }, "_metadata": { "eco": "C63", "name": "Ruy Lopez: Schliemann Defense, Dyckhoff Variation" } }, "Bxc6": { "_metadata": { "eco": "C63", "name": "Ruy Lopez: Schliemann Defense, Exchange Variation" } }, "exf5": { "_metadata": { "eco": "C63", "name": "Ruy Lopez: Schliemann Defense, Jaenisch Gambit Accepted" } }, "d4": { "_metadata": { "eco": "C63", "name": "Ruy Lopez: Schliemann Defense, Sch\u00f6nemann Attack" } } }, "Nf6": { "O-O": { "Bc5": { "c3": { "O-O": { "d4": { "Bb6": { "_metadata": { "eco": "C64", "name": "Ruy Lopez: Classical Defense, Benelux Variation" }, "Bg5": { "_metadata": { "eco": "C64", "name": "Ruy Lopez: Classical Variation, Modern Main Line" } } } } }, "_metadata": { "eco": "C65", "name": "Ruy Lopez: Classical Variation, Zukertort Gambit" } }, "_metadata": { "eco": "C65", "name": "Ruy Lopez: Berlin Defense, Beverwijk Variation" } }, "_metadata": { "eco": "C65", "name": "Ruy Lopez: Berlin Defense" }, "Ng4": { "_metadata": { "eco": "C65", "name": "Ruy Lopez: Berlin Defense, Fishing Pole Variation" } }, "d6": { "d4": { "Bd7": { "Nc3": { "Be7": { "Bg5": { "_metadata": { "eco": "C66", "name": "Ruy Lopez: Berlin Defense, Closed Bernstein Variation" } }, "Bxc6": { "_metadata": { "eco": "C66", "name": "Ruy Lopez: Berlin Defense, Closed Showalter Variation" } }, "_metadata": { "eco": "C66", "name": "Ruy Lopez: Berlin Defense, Hedgehog Variation" } }, "exd4": { "_metadata": { "eco": "C66", "name": "Ruy Lopez: Berlin Defense, Closed Wolf Variation" } } } }, "Nd7": { "_metadata": { "eco": "C66", "name": "Ruy Lopez: Closed Berlin Defense, Chigorin Variation" } } }, "_metadata": { "eco": "C66", "name": "Ruy Lopez: Berlin Defense, Improved Steinitz Defense" } }, "Nxe4": { "d4": { "Nd6": { "Bxc6": { "dxc6": { "dxe5": { "Nf5": { "Qxd8+": { "Kxd8": { "Nc3": { "Bd7": { "_metadata": { "eco": "C67", "name": "Ruy Lopez: Berlin Defense, Berlin Wall" } } }, "_metadata": { "eco": "C67", "name": "Ruy Lopez: Berlin Defense, l'Hermet Variation, Berlin Wall Defense" } } } }, "Ne4": { "_metadata": { "eco": "C67", "name": "Ruy Lopez: Berlin Defense, l'Hermet Variation, Westerinen Line" } } } } }, "_metadata": { "eco": "C67", "name": "Ruy Lopez: Berlin Defense, l'Hermet Variation" }, "Ba4": { "_metadata": { "eco": "C67", "name": "Ruy Lopez: Open Berlin Defense, Showalter Variation" } }, "dxe5": { "_metadata": { "eco": "C67", "name": "Ruy Lopez: Open Berlin Defense, l'Hermet Variation" } } }, "Be7": { "Qe2": { "Nd6": { "Bxc6": { "bxc6": { "dxe5": { "Nf5": { "_metadata": { "eco": "C67", "name": "Ruy Lopez: Berlin Defense, Cordel Variation" } }, "Nb7": { "b3": { "_metadata": { "eco": "C67", "name": "Ruy Lopez: Berlin Defense, Pillsbury Variation" } }, "Nc3": { "O-O": { "Re1": { "Nc5": { "1Nd4": { "Ne6": { "1Be3": { "Nxd4": { "1Bxd4": { "c5": { "_metadata": { "eco": "C67", "name": "Ruy Lopez: Berlin Defense, Rio de Janeiro Variation" } } } } } } } } } } }, "Nd4": { "_metadata": { "eco": "C67", "name": "Ruy Lopez: Berlin Defense, Winawer Attack" } }, "c4": { "_metadata": { "eco": "C67", "name": "Ruy Lopez: Berlin Defense, Zukertort Variation" } } } } } } }, "d5": { "_metadata": { "eco": "C67", "name": "Ruy Lopez: Berlin Defense, Trifunovic Variation" } } }, "dxe5": { "_metadata": { "eco": "C67", "name": "Ruy Lopez: Berlin Defense, Minckwitz Variation" } }, "_metadata": { "eco": "C67", "name": "Ruy Lopez: Berlin Defense, Rio de Janeiro Variation" } }, "a6": { "_metadata": { "eco": "C67", "name": "Ruy Lopez: Berlin Defense, Rosenthal Variation" } } }, "_metadata": { "eco": "C67", "name": "Ruy Lopez: Berlin Defense, Rio Gambit Accepted" } } }, "_metadata": { "eco": "C65", "name": "Ruy Lopez: Berlin Defense" }, "d3": { "d6": { "Bxc6+": { "_metadata": { "eco": "C65", "name": "Ruy Lopez: Berlin Defense, Anderssen Variation" } }, "c4": { "_metadata": { "eco": "C65", "name": "Ruy Lopez: Berlin Defense, Duras Variation" } } }, "Bc5": { "Be3": { "_metadata": { "eco": "C65", "name": "Ruy Lopez: Berlin Defense, Kaufmann Variation" } } }, "Ne7": { "Nxe5": { "c6": { "_metadata": { "eco": "C65", "name": "Ruy Lopez: Berlin Defense, Mortimer Trap" } } }, "_metadata": { "eco": "C65", "name": "Ruy Lopez: Berlin Defense, Mortimer Variation" } } }, "d4": { "exd4": { "O-O": { "_metadata": { "eco": "C65", "name": "Ruy Lopez: Berlin Defense, Nyholm Attack" } } } }, "Nxe5": { "_metadata": { "eco": "C65", "name": "Ruy Lopez: Halloween Attack" } } }, "Bc5": { "c3": { "Qe7": { "_metadata": { "eco": "C64", "name": "Ruy Lopez: Classical Defense, Boden Variation" } }, "_metadata": { "eco": "C64", "name": "Ruy Lopez: Classical Variation, Central Variation" }, "Bb6": { "_metadata": { "eco": "C64", "name": "Ruy Lopez: Classical Variation, Charousek Variation" } }, "f5": { "_metadata": { "eco": "C64", "name": "Ruy Lopez: Classical Variation, Cordel Gambit" } }, "d5": { "_metadata": { "eco": "C64", "name": "Ruy Lopez: Classical Variation, Konikowski Gambit" } } }, "O-O": { "Nd4": { "b4": { "_metadata": { "eco": "C64", "name": "Ruy Lopez: Classical Defense, Zaitsev Variation" } } } }, "_metadata": { "eco": "C64", "name": "Ruy Lopez: Classical Variation" }, "b4": { "_metadata": { "eco": "C64", "name": "Ruy Lopez: Classical Variation, Spanish Wing Gambit" } } }, "a6": { "Bxc6": { "_metadata": { "eco": "C68", "name": "Ruy Lopez: Exchange Variation" }, "dxc6": { "d4": { "exd4": { "Qxd4": { "Qxd4": { "Nxd4": { "Bd6": { "_metadata": { "eco": "C68", "name": "Ruy Lopez: Exchange Variation, Alekhine Variation" } }, "Bd7": { "_metadata": { "eco": "C68", "name": "Ruy Lopez: Exchange, Alekhine Variation" } } } } } } }, "Nc3": { "_metadata": { "eco": "C68", "name": "Ruy Lopez: Exchange Variation, Keres Variation" }, "f6": { "d3": { "_metadata": { "eco": "C68", "name": "Ruy Lopez: Exchange Variation, Romanovsky Variation" } } } }, "O-O": { "Bg4": { "h3": { "h5": { "_metadata": { "eco": "C69", "name": "Ruy Lopez: Exchange Variation, Alapin Gambit" } } } }, "Qd6": { "_metadata": { "eco": "C69", "name": "Ruy Lopez: Exchange Variation, Bronstein Variation" } }, "f6": { "_metadata": { "eco": "C69", "name": "Ruy Lopez: Exchange Variation, Gligoric Variation" } }, "Bd6": { "_metadata": { "eco": "C69", "name": "Ruy Lopez: Exchange Variation, King's Bishop Variation" } }, "_metadata": { "eco": "C69", "name": "Ruy Lopez: Exchange Variation, Normal Variation" } } }, "bxc6": { "_metadata": { "eco": "C68", "name": "Ruy Lopez: Exchange Variation, Lutikov Variation" } } }, "Ba4": { "Nd4": { "_metadata": { "eco": "C70", "name": "Ruy Lopez: Bird's Defense Deferred" } }, "Bb4": { "_metadata": { "eco": "C70", "name": "Ruy Lopez: Morphy Defense, Alapin's Defense Deferred" } }, "b5": { "_metadata": { "eco": "C70", "name": "Ruy Lopez: Morphy Defense, Caro Variation" }, "Bb3": { "Bc5": { "_metadata": { "eco": "C70", "name": "Ruy Lopez: Morphy Defense, Graz Variation" } }, "Na5": { "_metadata": { "eco": "C70", "name": "Ruy Lopez: Morphy Defense, Norwegian Variation" }, "Bxf7+": { "_metadata": { "eco": "C70", "name": "Ruy Lopez: Morphy Defense, Norwegian Variation, Nightingale Gambit" } } }, "d6": { "d4": { "Nxd4": { "Nxd4": { "exd4": { "Qxd4": { "c5": { "_metadata": { "eco": "C71", "name": "Ruy Lopez: Noah's Ark Trap" } } } } } } } } } }, "Bc5": { "_metadata": { "eco": "C70", "name": "Ruy Lopez: Morphy Defense, Classical Defense Deferred" } }, "Nge7": { "_metadata": { "eco": "C70", "name": "Ruy Lopez: Morphy Defense, Cozio Defense" } }, "g6": { "_metadata": { "eco": "C70", "name": "Ruy Lopez: Morphy Defense, Fianchetto Defense Deferred" } }, "f5": { "_metadata": { "eco": "C70", "name": "Ruy Lopez: Morphy Defense, Schliemann Defense Deferred" }, "exf5": { "_metadata": { "eco": "C70", "name": "Ruy Lopez: Morphy Defense, Schliemann Defense Deferred, Jaenisch Gambit Deferred" } } }, "d6": { "_metadata": { "eco": "C71", "name": "Ruy Lopez: Morphy Defense, Modern Steinitz Defense" }, "Nc3": { "_metadata": { "eco": "C71", "name": "Ruy Lopez: Morphy Defense, Modern Steinitz Defense" } }, "c4": { "_metadata": { "eco": "C71", "name": "Ruy Lopez: Morphy Defense, Modern Steinitz Defense" } }, "O-O": { "Bd7": { "c3": { "Nf6": { "d4": { "Be7": { "Nbd2": { "O-O": { "Re1": { "Be8": { "_metadata": { "eco": "C72", "name": "Ruy Lopez: Closed, Kecskemet Variation" } } } } } } } } } }, "_metadata": { "eco": "C72", "name": "Ruy Lopez: Morphy Defense, Modern Steinitz Defense" } }, "Bxc6+": { "bxc6": { "d4": { "_metadata": { "eco": "C73", "name": "Ruy Lopez: Morphy Defense, Modern Steinitz Defense" }, "f6": { "_metadata": { "eco": "C73", "name": "Ruy Lopez: Morphy Defense, Modern Steinitz Defense" } } } } }, "c3": { "_metadata": { "eco": "C74", "name": "Ruy Lopez: Morphy Defense, Modern Steinitz Defense" }, "f5": { "exf5": { "Bxf5": { "O-O": { "_metadata": { "eco": "C74", "name": "Ruy Lopez: Morphy Defense, Modern Steinitz Defense" } } } }, "_metadata": { "eco": "C74", "name": "Ruy Lopez: Morphy Defense, Modern Steinitz Defense, Siesta Variation" } }, "Bd7": { "_metadata": { "eco": "C75", "name": "Ruy Lopez: Morphy Defense, Modern Steinitz Defense" }, "d4": { "Nge7": { "_metadata": { "eco": "C75", "name": "Ruy Lopez: Morphy Defense, Modern Steinitz Defense" } } } } } }, "Nf6": { "d3": { "_metadata": { "eco": "C77", "name": "Ruy Lopez: Morphy Defense, Anderssen Variation" }, "d6": { "c4": { "_metadata": { "eco": "C77", "name": "Ruy Lopez: Morphy Defense, Duras Variation" } } } }, "Bxc6": { "_metadata": { "eco": "C77", "name": "Ruy Lopez: Morphy Defense, Bayreuth Variation" } }, "c3": { "_metadata": { "eco": "C77", "name": "Ruy Lopez: Morphy Defense, Jaffe Gambit" } }, "d4": { "_metadata": { "eco": "C77", "name": "Ruy Lopez: Morphy Defense, Mackenzie Variation" } }, "Nc3": { "_metadata": { "eco": "C77", "name": "Ruy Lopez: Morphy Defense, Tarrasch Variation" } }, "Qe2": { "_metadata": { "eco": "C77", "name": "Ruy Lopez: Morphy Defense, Wormald Attack" }, "b5": { "Bb3": { "Be7": { "d4": { "d6": { "c3": { "Bg4": { "_metadata": { "eco": "C77", "name": "Ruy Lopez: Wormald Attack, Gr\u00fcnfeld Variation" } } } } } } } } }, "O-O": { "g6": { "_metadata": { "eco": "C78", "name": "Ruy Lopez: Brix Variation" } }, "d5": { "_metadata": { "eco": "C78", "name": "Ruy Lopez: Central Countergambit" } }, "_metadata": { "eco": "C78", "name": "Ruy Lopez: Morphy Defense" }, "b5": { "Bb3": { "d6": { "_metadata": { "eco": "C78", "name": "Ruy Lopez: Morphy Defense" }, "Ng5": { "d5": { "exd5": { "Nd4": { "Re1": { "Bc5": { "Rxe5+": { "Kf8": { "_metadata": { "eco": "C78", "name": "Ruy Lopez: Rabinovich Variation" } } } } } } } } } }, "Bb7": { "_metadata": { "eco": "C78", "name": "Ruy Lopez: Morphy Defense, Arkhangelsk Variation" } }, "Be7": { "a4": { "_metadata": { "eco": "C78", "name": "Ruy Lopez: Morphy Defense, Wing Attack" } } } } }, "Bc5": { "_metadata": { "eco": "C78", "name": "Ruy Lopez: Morphy Defense, Neo-Arkhangelsk Variation" } }, "d6": { "_metadata": { "eco": "C79", "name": "Ruy Lopez: Morphy Defense, Steinitz Deferred" }, "Bxc6+": { "bxc6": { "d4": { "Nxe4": { "_metadata": { "eco": "C79", "name": "Ruy Lopez: Morphy Defense, Steinitz Deferred" }, "Re1": { "f5": { "dxe5": { "d5": { "Nc3": { "_metadata": { "eco": "C79", "name": "Ruy Lopez: Steinitz Defense Deferred, Boleslavsky Variation" } } } } } } }, "Bg4": { "_metadata": { "eco": "C79", "name": "Ruy Lopez: Steinitz Defense Deferred, Lipnitsky Variation" } } } } } }, "Nxe4": { "Qe2": { "_metadata": { "eco": "C80", "name": "Ruy Lopez: Morphy Defense, Tartakower Variation" } }, "_metadata": { "eco": "C80", "name": "Ruy Lopez: Open" }, "d4": { "_metadata": { "eco": "C80", "name": "Ruy Lopez: Open" }, "b5": { "Bb3": { "_metadata": { "eco": "C80", "name": "Ruy Lopez: Open" }, "d5": { "dxe5": { "_metadata": { "eco": "C80", "name": "Ruy Lopez: Open" }, "Be6": { "Nbd2": { "_metadata": { "eco": "C80", "name": "Ruy Lopez: Open, Bernstein Variation" }, "Bc5": { "Qe1": { "_metadata": { "eco": "C80", "name": "Ruy Lopez: Open, Bernstein Variation, Luther Line" } } }, "Nc5": { "c3": { "d4": { "1Ng5": { "_metadata": { "eco": "C80", "name": "Ruy Lopez: Open, Karpov Gambit" } } } } } }, "_metadata": { "eco": "C80", "name": "Ruy Lopez: Open, Main Line" }, "Qe2": { "_metadata": { "eco": "C81", "name": "Ruy Lopez: Open, Howell Attack" }, "Be7": { "c4": { "_metadata": { "eco": "C81", "name": "Ruy Lopez: Open, Howell Attack" } }, "Rd1": { "O-O": { "1c4": { "bxc4": { "1Bxc4": { "Qd7": { "_metadata": { "eco": "C81", "name": "Ruy Lopez: Open, Howell Attack, Ekstrom Variation" } } } } } } } } }, "c3": { "_metadata": { "eco": "C82", "name": "Ruy Lopez: Open" }, "Nc5": { "_metadata": { "eco": "C82", "name": "Ruy Lopez: Open, Berlin Variation" } }, "Bc5": { "Nbd2": { "O-O": { "1Bc2": { "Nxf2": { "_metadata": { "eco": "C82", "name": "Ruy Lopez: Open, Dilworth Variation" } } } }, "_metadata": { "eco": "C82", "name": "Ruy Lopez: Open, St. Petersburg Variation" } }, "_metadata": { "eco": "C82", "name": "Ruy Lopez: Open, Italian Variation" }, "Qd3": { "_metadata": { "eco": "C82", "name": "Ruy Lopez: Open, Motzko Attack" }, "Ne7": { "_metadata": { "eco": "C82", "name": "Ruy Lopez: Open, Motzko Attack, Nenarokov Variation" } } } }, "Be7": { "Re1": { "O-O": { "1Nd4": { "Nxe5": { "_metadata": { "eco": "C83", "name": "Ruy Lopez: Open, Breslau Variation" } }, "Qd7": { "1Nxe6": { "fxe6": { "1Rxe4": { "_metadata": { "eco": "C83", "name": "Ruy Lopez: Open, Tarrasch Trap" } } } } } } } }, "_metadata": { "eco": "C83", "name": "Ruy Lopez: Open, Classical Defense" }, "Nbd2": { "O-O": { "1Qe2": { "_metadata": { "eco": "C83", "name": "Ruy Lopez: Open, Malkin Variation" } } } } } } }, "Ne7": { "_metadata": { "eco": "C80", "name": "Ruy Lopez: Open, Zukertort Variation" } } }, "a4": { "Nxd4": { "Nxd4": { "exd4": { "Nc3": { "_metadata": { "eco": "C80", "name": "Ruy Lopez: Open, Berger Variation" } } } }, "_metadata": { "eco": "C80", "name": "Ruy Lopez: Open, Schlechter Defense" } } }, "c4": { "_metadata": { "eco": "C80", "name": "Ruy Lopez: Open, Harksen Gambit" } } } }, "Nxe5": { "_metadata": { "eco": "C80", "name": "Ruy Lopez: Open, Friess Attack" } }, "d5": { "_metadata": { "eco": "C80", "name": "Ruy Lopez: Open, Richter Variation" } } }, "exd4": { "_metadata": { "eco": "C80", "name": "Ruy Lopez: Open, Riga Variation" } }, "Be7": { "Re1": { "b5": { "Bb3": { "d5": { "dxe5": { "Be6": { "c3": { "_metadata": { "eco": "C83", "name": "Ruy Lopez: Open, Classical Defense, Main Line" } } } } } } } } } }, "Nc3": { "_metadata": { "eco": "C80", "name": "Ruy Lopez: Open, Knorre Variation" } }, "Re1": { "d5": { "_metadata": { "eco": "C80", "name": "Ruy Lopez: Open, Skipworth Gambit" } } } }, "Be7": { "_metadata": { "eco": "C84", "name": "Ruy Lopez: Closed" }, "d4": { "exd4": { "e5": { "Ne4": { "c3": { "_metadata": { "eco": "C84", "name": "Ruy Lopez: Closed, Basque Gambit" }, "dxc3": { "_metadata": { "eco": "C84", "name": "Ruy Lopez: Closed, Center Attack, Basque Gambit" } } } } } }, "_metadata": { "eco": "C84", "name": "Ruy Lopez: Closed, Center Attack" } }, "d3": { "_metadata": { "eco": "C84", "name": "Ruy Lopez: Closed, Martinez Variation" } }, "Nc3": { "_metadata": { "eco": "C84", "name": "Ruy Lopez: Closed, Morphy Attack" } }, "Bxc6": { "_metadata": { "eco": "C85", "name": "Ruy Lopez: Closed, Delayed Exchange" } }, "Qe2": { "_metadata": { "eco": "C86", "name": "Ruy Lopez: Closed, Worrall Attack" }, "b5": { "Bb3": { "O-O": { "_metadata": { "eco": "C86", "name": "Ruy Lopez: Closed, Worrall Attack, Castling Line" } }, "d6": { "_metadata": { "eco": "C86", "name": "Ruy Lopez: Closed, Worrall Attack, Delayed Castling Line" } } } } }, "Re1": { "d6": { "_metadata": { "eco": "C87", "name": "Ruy Lopez: Closed, Averbakh Variation" } }, "b5": { "Bb3": { "_metadata": { "eco": "C88", "name": "Ruy Lopez: Closed" }, "O-O": { "_metadata": { "eco": "C88", "name": "Ruy Lopez: Closed" }, "a4": { "_metadata": { "eco": "C88", "name": "Ruy Lopez: Closed, Anti-Marshall" } }, "c3": { "d5": { "_metadata": { "eco": "C89", "name": "Ruy Lopez: Marshall Attack" }, "exd5": { "Nxd5": { "Nxe5": { "Nxe5": { "1Rxe5": { "c6": { "1d4": { "_metadata": { "eco": "C89", "name": "Ruy Lopez: Marshall Attack, Main Line" }, "Bd6": { "1Re1": { "Qh4": { "1g3": { "Qh3": { "1Be3": { "Bg4": { "1Qd3": { "Rae8": { "1Nd2": { "Re6": { "1a4": { "Qh5": { "_metadata": { "eco": "C89", "name": "Ruy Lopez: Marshall Attack, Main Line, Spassky Variation" } } } } } } } } }, "_metadata": { "eco": "C89", "name": "Ruy Lopez: Marshall Attack, Modern Main Line" } } } } } } }, "_metadata": { "eco": "C89", "name": "Ruy Lopez: Marshall Attack, Modern Variation" }, "1Bxd5": { "cxd5": { "1d4": { "Bd6": { "1Re3": { "_metadata": { "eco": "C89", "name": "Ruy Lopez: Marshall Attack, Re3 Variation" } } } } } } }, "Nf6": { "_metadata": { "eco": "C89", "name": "Ruy Lopez: Marshall Attack, Original Marshall Attack" } } } } } }, "e4": { "_metadata": { "eco": "C89", "name": "Ruy Lopez: Marshall Attack, Steiner Variation" } } } } }, "d3": { "d6": { "c3": { "_metadata": { "eco": "C90", "name": "Ruy Lopez: Closed, Pilnik Variation" } } } } }, "d6": { "c3": { "Na5": { "Bc2": { "c5": { "d4": { "Qc7": { "1Nbd2": { "O-O": { "1Nf1": { "Bg4": { "1Ne3": { "Bxf3": { "1Qxf3": { "_metadata": { "eco": "C88", "name": "Ruy Lopez: Closed, Alekhine Gambit" } } } } } } } }, "1a4": { "_metadata": { "eco": "C88", "name": "Ruy Lopez: Closed, Balla Variation" } }, "1h3": { "Nc6": { "1d5": { "Nb8": { "1Nbd2": { "g5": { "_metadata": { "eco": "C88", "name": "Ruy Lopez: Closed, Leonhardt Variation" } } } } } } } } } } } }, "O-O": { "_metadata": { "eco": "C90", "name": "Ruy Lopez: Closed" }, "Bc2": { "_metadata": { "eco": "C90", "name": "Ruy Lopez: Closed, Lutikov Variation" } }, "a3": { "_metadata": { "eco": "C90", "name": "Ruy Lopez: Closed, Suetin Variation" } }, "d4": { "Bg4": { "_metadata": { "eco": "C91", "name": "Ruy Lopez: Closed, Bogoljubow Variation" }, "a4": { "_metadata": { "eco": "C91", "name": "Ruy Lopez: Closed, Yates Variation, Short Attack" } } }, "_metadata": { "eco": "C91", "name": "Ruy Lopez: Closed, Yates Variation" } }, "h3": { "_metadata": { "eco": "C92", "name": "Ruy Lopez: Closed" }, "Bb7": { "_metadata": { "eco": "C92", "name": "Ruy Lopez: Closed, Flohr System" }, "d4": { "Re8": { "1Nbd2": { "Bf8": { "1a3": { "h6": { "_metadata": { "eco": "C92", "name": "Ruy Lopez: Closed, Smyslov-Breyer-Zaitsev Hybrid" } } } } } } } }, "Nd7": { "_metadata": { "eco": "C92", "name": "Ruy Lopez: Closed, Karpov Variation" } }, "Be6": { "_metadata": { "eco": "C92", "name": "Ruy Lopez: Closed, Kholmov Variation" } }, "Re8": { "_metadata": { "eco": "C92", "name": "Ruy Lopez: Closed, Zaitsev System" } }, "h6": { "_metadata": { "eco": "C93", "name": "Ruy Lopez: Closed, Smyslov Defense" } }, "Nb8": { "_metadata": { "eco": "C94", "name": "Ruy Lopez: Closed, Breyer Defense" }, "d3": { "_metadata": { "eco": "C94", "name": "Ruy Lopez: Closed, Breyer Defense, Quiet Variation" } }, "d4": { "_metadata": { "eco": "C95", "name": "Ruy Lopez: Closed, Breyer" }, "Nbd7": { "1Nbd2": { "Bb7": { "1Bc2": { "c5": { "_metadata": { "eco": "C95", "name": "Ruy Lopez: Closed, Breyer Defense" } } } } }, "1Nh4": { "_metadata": { "eco": "C95", "name": "Ruy Lopez: Closed, Breyer Defense" } }, "_metadata": { "eco": "C95", "name": "Ruy Lopez: Closed, Breyer Defense, Zaitsev Hybrid" } } } }, "Na5": { "Bc2": { "c5": { "1d4": { "Nc6": { "_metadata": { "eco": "C96", "name": "Ruy Lopez: Closed, Borisenko Variation" } }, "Nd7": { "_metadata": { "eco": "C96", "name": "Ruy Lopez: Closed, Keres Defense" } }, "Qc7": { "_metadata": { "eco": "C97", "name": "Ruy Lopez: Closed, Chigorin Defense" }, "1Nbd2": { "Bd7": { "1Nf1": { "Rfe8": { "1Ne3": { "g6": { "_metadata": { "eco": "C97", "name": "Ruy Lopez: Closed, Chigorin, Yugoslav System" } } } } } }, "Nc6": { "_metadata": { "eco": "C98", "name": "Ruy Lopez: Closed, Chigorin Defense" }, "1dxc5": { "_metadata": { "eco": "C98", "name": "Ruy Lopez: Closed, Chigorin Defense" } } }, "cxd4": { "1cxd4": { "_metadata": { "eco": "C99", "name": "Ruy Lopez: Closed, Chigorin Defense, Panov System" } } } } } }, "_metadata": { "eco": "C96", "name": "Ruy Lopez: Closed, Chigorin Defense" } }, "_metadata": { "eco": "C96", "name": "Ruy Lopez: Closed, Chigorin Defense" }, "d5": { "_metadata": { "eco": "C96", "name": "Ruy Lopez: Closed, Chigorin Defense, Gajewski Gambit" } }, "c6": { "1d4": { "Qc7": { "_metadata": { "eco": "C96", "name": "Ruy Lopez: Closed, Rossolimo Defense" } } } } }, "_metadata": { "eco": "C97", "name": "Ruy Lopez: Closed, Chigorin Defense" } } } } }, "d4": { "_metadata": { "eco": "C88", "name": "Ruy Lopez: Closed, Rosen Attack" }, "Nxd4": { "Nxd4": { "exd4": { "Qxd4": { "c5": { "_metadata": { "eco": "C88", "name": "Ruy Lopez: Noah's Ark Trap" } } } } } } } }, "Bb7": { "_metadata": { "eco": "C88", "name": "Ruy Lopez: Closed, Trajkovic Counterattack" } } } } } } } } }, "_metadata": { "eco": "C70", "name": "Ruy Lopez: Morphy Defense" } } } } } } }, "c4": { "_metadata": { "eco": "A10", "name": "English Opening" }, "Nf6": { "e4": { "_metadata": { "eco": "A10", "name": "English Opening: Achilles-Omega Gambit" } }, "Nf3": { "c6": { "b3": { "d5": { "Bb2": { "Bg4": { "_metadata": { "eco": "A12", "name": "R\u00fcti Opening: Anglo-Slav Variation, Capablanca Variation" } } } } } }, "e6": { "g3": { "a6": { "Bg2": { "b5": { "_metadata": { "eco": "A13", "name": "English Opening: Romanishin Gambit" } } } } } }, "g6": { "g3": { "d5": { "_metadata": { "eco": "A15", "name": "English Opening: Anglo-Indian Defense, Gr\u00fcnfeld Formation" } }, "b6": { "Bg2": { "Bb7": { "_metadata": { "eco": "A15", "name": "English Opening: Anglo-Indian Defense, King's Indian Formation, Double Fianchetto" } } } }, "c6": { "_metadata": { "eco": "A15", "name": "English Opening: Anglo-Indian Defense, Slav Formation" } }, "Bg7": { "Bg2": { "O-O": { "O-O": { "c5": { "Nc3": { "Nc6": { "d3": { "_metadata": { "eco": "A38", "name": "English Opening: Symmetrical Variation, Duchamp Variation" } } } } } } } } } }, "_metadata": { "eco": "A15", "name": "English Opening: Anglo-Indian Defense, King's Indian Formation" } }, "_metadata": { "eco": "A15", "name": "English Opening: Anglo-Indian Defense, King's Knight Variation" }, "d6": { "_metadata": { "eco": "A15", "name": "English Opening: Anglo-Indian Defense, Old Indian Formation" } }, "b6": { "_metadata": { "eco": "A15", "name": "English Opening: Anglo-Indian Defense, Queen's Indian Formation" } }, "d5": { "_metadata": { "eco": "A15", "name": "English Opening: Anglo-Indian Defense, Scandinavian Defense" }, "cxd5": { "Nxd5": { "_metadata": { "eco": "A15", "name": "English Opening: Anglo-Indian Defense, Scandinavian Defense, Exchange Variation" } } } }, "c5": { "Nc3": { "Nc6": { "_metadata": { "eco": "A35", "name": "English Opening: Symmetrical Variation, Four Knights Variation" }, "g3": { "g6": { "Bg2": { "Bg7": { "_metadata": { "eco": "A38", "name": "English Opening: Symmetrical Variation, Full Symmetry Line" }, "O-O": { "O-O": { "d4": { "_metadata": { "eco": "A39", "name": "English Opening: Symmetrical Variation, Mecking Variation" } } } } } } } } } } } }, "g3": { "c6": { "Nf3": { "d5": { "b3": { "Bf5": { "_metadata": { "eco": "A12", "name": "R\u00fcti Opening: Anglo-Slav Variation, London Defensive System" } }, "Bg4": { "_metadata": { "eco": "A12", "name": "R\u00fcti Opening: Anglo-Slav Variation, Torre System" } } } } } } }, "_metadata": { "eco": "A15", "name": "English Opening: Anglo-Indian Defense" }, "Nc3": { "g6": { "Nf3": { "Bg7": { "e4": { "_metadata": { "eco": "A15", "name": "English Opening: Anglo-Indian Defense, Anti-Anti-Gr\u00fcnfeld" } } } } }, "d5": { "_metadata": { "eco": "A16", "name": "English Opening: Anglo-Gr\u00fcnfeld Defense" }, "cxd5": { "Nxd5": { "Nf3": { "g6": { "g3": { "Bg7": { "Bg2": { "e5": { "_metadata": { "eco": "A16", "name": "English Opening: Anglo-Gr\u00fcnfeld Defense, Korchnoi Variation" } } } } }, "_metadata": { "eco": "A16", "name": "English Opening: Anglo-Indian Defense, Anglo-Gr\u00fcnfeld Variation" } }, "_metadata": { "eco": "A16", "name": "English Opening: Anglo-Indian Defense, Anglo-Gr\u00fcnfeld Variation" }, "c5": { "e3": { "e6": { "_metadata": { "eco": "A17", "name": "English Opening: Anglo-Indian Defense" } } } } }, "g3": { "g6": { "Bg2": { "Nb6": { "_metadata": { "eco": "A16", "name": "English Opening: Anglo-Indian Defense, Anglo-Gr\u00fcnfeld Variation" } }, "Nxc3": { "_metadata": { "eco": "A16", "name": "English Opening: Anglo-Indian Defense, Anglo-Gr\u00fcnfeld Variation" } } } } } } } }, "_metadata": { "eco": "A16", "name": "English Opening: Anglo-Indian Defense, Queen's Knight Variation" }, "e6": { "_metadata": { "eco": "A17", "name": "English Opening: Anglo-Indian Defense, Hedgehog System" }, "Nf3": { "Bb4": { "_metadata": { "eco": "A17", "name": "English Opening: Anglo-Indian Defense, Nimzo-English" } } } }, "c5": { "g3": { "_metadata": { "eco": "A34", "name": "English Opening: Symmetrical Variation, Fianchetto Variation" }, "d5": { "cxd5": { "Nxd5": { "Bg2": { "Nc7": { "_metadata": { "eco": "A34", "name": "English Opening: Symmetrical Variation, Rubinstein Variation" } } } } } } } } }, "b4": { "_metadata": { "eco": "A15", "name": "English Orangutan" } }, "d4": { "c5": { "Nf3": { "_metadata": { "eco": "A31", "name": "English Opening: Symmetrical Variation, Anti-Benoni Variation" } } } } }, "g6": { "e4": { "e5": { "_metadata": { "eco": "A10", "name": "English Opening: Adorjan Defense" } } }, "_metadata": { "eco": "A10", "name": "English Opening: Great Snake Variation" }, "Nc3": { "Bg7": { "g3": { "Nf6": { "Bg2": { "O-O": { "e4": { "d6": { "Nge2": { "e5": { "O-O": { "c6": { "d3": { "a6": { "_metadata": { "eco": "A10", "name": "English Opening: King's English Variation, Botvinnik System, Prickly Pawn Pass System" } } } } } } } } } } } } } } } }, "f5": { "_metadata": { "eco": "A10", "name": "English Opening: Anglo-Dutch Defense" }, "e4": { "_metadata": { "eco": "A10", "name": "English Opening: Anglo-Dutch Defense, Hickmann Gambit" } }, "Nf3": { "d6": { "e4": { "_metadata": { "eco": "A10", "name": "English Opening: Anglo-Dutch Variation, Chabanon Gambit" } } } }, "Nc3": { "Nf6": { "e4": { "_metadata": { "eco": "A10", "name": "English Opening: Anglo-Dutch Variation, Ferenc Gambit" }, "fxe4": { "g4": { "_metadata": { "eco": "A10", "name": "English Opening: Porcupine Variation" } } } } } }, "g4": { "_metadata": { "eco": "A10", "name": "English Opening: Wade Gambit" } } }, "Nc6": { "_metadata": { "eco": "A10", "name": "English Opening: Anglo-Lithuanian Variation" } }, "d5": { "_metadata": { "eco": "A10", "name": "English Opening: Anglo-Scandinavian Defense" }, "cxd5": { "e6": { "_metadata": { "eco": "A10", "name": "English Opening: Anglo-Scandinavian Defense, L\u00f6hn Gambit" } }, "Qxd5": { "Nc3": { "Qa5": { "_metadata": { "eco": "A10", "name": "English Opening: Anglo-Scandinavian Defense, Malvinas Variation" } } } }, "Nf6": { "_metadata": { "eco": "A10", "name": "English Opening: Anglo-Scandinavian Defense, Schulz Gambit" } } } }, "b5": { "_metadata": { "eco": "A10", "name": "English Opening: Jaenisch Gambit" } }, "g5": { "_metadata": { "eco": "A10", "name": "English Opening: Myers Defense" }, "d4": { "Bg7": { "_metadata": { "eco": "A10", "name": "English Opening: Myers Gambit" } }, "e5": { "_metadata": { "eco": "A10", "name": "English Opening: Zilbermints Gambit" } } } }, "c6": { "_metadata": { "eco": "A11", "name": "English Opening: Caro-Kann Defensive System" } }, "e6": { "_metadata": { "eco": "A13", "name": "English Opening: Agincourt Defense" }, "Nf3": { "_metadata": { "eco": "A13", "name": "English Opening: Agincourt Defense" }, "d5": { "_metadata": { "eco": "A13", "name": "English Opening: Agincourt Defense" }, "g3": { "Nf6": { "Bg2": { "Bd6": { "_metadata": { "eco": "A13", "name": "English Opening: Agincourt Defense, Bogoljubow Defense" } }, "c5": { "b3": { "Nc6": { "O-O": { "Be7": { "_metadata": { "eco": "A13", "name": "English Opening: Agincourt Defense, Tarrasch Defense" } } } } } }, "Be7": { "_metadata": { "eco": "A13", "name": "English Opening: Neo-Catalan Declined" }, "O-O": { "c5": { "cxd5": { "Nxd5": { "Nc3": { "Nc6": { "_metadata": { "eco": "A14", "name": "English Opening: Agincourt Defense, Keres Defense" } } } } } }, "_metadata": { "eco": "A14", "name": "English Opening: Agincourt Defense, Neo-Catalan Declined" } } } }, "_metadata": { "eco": "A13", "name": "English Opening: Neo-Catalan" } }, "b6": { "Bg2": { "Bb7": { "O-O": { "_metadata": { "eco": "A13", "name": "English Opening: Agincourt Defense, Catalan Defense" } } } } }, "c5": { "_metadata": { "eco": "A13", "name": "English Opening: Agincourt Defense, Catalan Defense" } }, "c6": { "_metadata": { "eco": "A13", "name": "English Opening: Agincourt Defense, Kurajica Defense" } } } }, "Nf6": { "g3": { "d5": { "Bg2": { "dxc4": { "_metadata": { "eco": "A13", "name": "English Opening: Agincourt Defense, Catalan Defense Accepted" } }, "c6": { "_metadata": { "eco": "A13", "name": "English Opening: Agincourt Defense, Catalan Defense, Semi-Slav Defense" } } } }, "b6": { "Bg2": { "Bb7": { "_metadata": { "eco": "A15", "name": "English Opening: Anglo-Indian Defense, Queen's Indian Formation" } } } }, "a6": { "_metadata": { "eco": "A15", "name": "English Opening: Anglo-Indian Defense, Romanishin Variation" } } }, "b3": { "d5": { "Bb2": { "c5": { "e3": { "_metadata": { "eco": "A13", "name": "English Opening: Agincourt Defense, Wimpy System" } } } } } }, "Nc3": { "c5": { "g3": { "b6": { "Bg2": { "Bb7": { "O-O": { "Be7": { "_metadata": { "eco": "A30", "name": "English Opening: Symmetrical Variation, Hedgehog Defense" } } } } } } }, "d4": { "Nc6": { "g3": { "cxd4": { "Nxd4": { "Qb6": { "_metadata": { "eco": "A33", "name": "English Opening: Symmetrical Variation, Anti-Benoni Variation, Geller Variation" } } } } } }, "cxd4": { "Nxd4": { "Nc6": { "_metadata": { "eco": "A33", "name": "English Opening: Symmetrical Variation, Anti-Benoni Variation, Spielmann Defense" } } } } } } } }, "c5": { "Nc3": { "Nf6": { "g3": { "b6": { "Bg2": { "Bb7": { "O-O": { "Be7": { "d4": { "cxd4": { "Qxd4": { "d6": { "Rd1": { "a6": { "b3": { "Nbd7": { "_metadata": { "eco": "A30", "name": "English Opening: Symmetrical, Hedgehog, Flexible Formation" } } } } } } } } } } } } } } } } } } }, "Nc3": { "Nf6": { "Nf3": { "b6": { "_metadata": { "eco": "A17", "name": "English Opening: Anglo-Indian Defense, Queen's Indian Formation" }, "e4": { "Bb7": { "Bd3": { "_metadata": { "eco": "A17", "name": "English Opening: Anglo-Indian Defense, Queen's Indian Variation" } } } } }, "Bb4": { "g4": { "_metadata": { "eco": "A17", "name": "English Opening: Anglo-Indian Defense, Zvjaginsev-Krasenkow Attack" } } } }, "e4": { "_metadata": { "eco": "A18", "name": "English Opening: Mikenas-Carls Variation" }, "Nc6": { "_metadata": { "eco": "A18", "name": "English Opening: Mikenas-Carls Variation" } }, "d5": { "e5": { "_metadata": { "eco": "A18", "name": "English Opening: Mikenas-Carls Variation" } } }, "c5": { "e5": { "Ng8": { "_metadata": { "eco": "A19", "name": "English Opening: Anglo-Indian Defense, Flohr-Mikenas-Carls Variation, Nei Gambit" } } }, "_metadata": { "eco": "A19", "name": "English Opening: Mikenas-Carls, Sicilian" } } } } }, "d4": { "c5": { "Nf3": { "cxd4": { "Nxd4": { "Nf6": { "_metadata": { "eco": "A32", "name": "English Opening: Symmetrical Variation, Anti-Benoni Variation, Spielmann Defense" } } } } } }, "b6": { "Nc3": { "Bb7": { "e4": { "f5": { "exf5": { "Nf6": { "_metadata": { "eco": "A40", "name": "English Defense: Hartlaub Gambit Accepted" } } }, "d5": { "_metadata": { "eco": "A40", "name": "English Defense: Hartlaub Gambit Declined" } } } } } } } } }, "e5": { "g3": { "h5": { "_metadata": { "eco": "A20", "name": "English Opening: Drill Variation" } }, "Nf6": { "Bg2": { "d5": { "cxd5": { "Nxd5": { "Nf3": { "Nc6": { "_metadata": { "eco": "A29", "name": "English Opening: King's English Variation, Four Knights Variation, Fianchetto Line" }, "d3": { "_metadata": { "eco": "A29", "name": "English Opening: King's English Variation, Four Knights Variation, Fianchetto Line" }, "Be7": { "O-O": { "O-O": { "_metadata": { "eco": "A29", "name": "English Opening: King's English Variation, Four Knights Variation, Fianchetto Line" } } } } } } } } } } } } }, "_metadata": { "eco": "A20", "name": "English Opening: King's English Variation" }, "e3": { "Nf6": { "f4": { "exf4": { "Nf3": { "_metadata": { "eco": "A20", "name": "English Opening: King's English Variation, Kahiko-Hula Gambit" } } } } } }, "Nf3": { "_metadata": { "eco": "A20", "name": "English Opening: King's English Variation, Nimzowitsch Variation" }, "e4": { "_metadata": { "eco": "A20", "name": "English Opening: King's English Variation, Nimzowitsch-Flohr Variation" } } }, "Nc3": { "d6": { "Nf3": { "_metadata": { "eco": "A21", "name": "English Opening: King's English Variation" }, "Bg4": { "_metadata": { "eco": "A21", "name": "English Opening: King's English Variation, Smyslov Defense" } } }, "g3": { "c6": { "_metadata": { "eco": "A21", "name": "English Opening: King's English Variation, Keres Defense" } } } }, "Bb4": { "_metadata": { "eco": "A21", "name": "English Opening: King's English Variation, Kramnik-Shirov Counterattack" } }, "_metadata": { "eco": "A21", "name": "English Opening: King's English Variation, Reversed Sicilian" }, "Nc6": { "g3": { "d6": { "Bg2": { "Be6": { "_metadata": { "eco": "A21", "name": "English Opening: King's English Variation, Troger Defense" } } } }, "g6": { "Rb1": { "Nh6": { "Bg2": { "Bg7": { "_metadata": { "eco": "A25", "name": "English Opening: Closed, Taimanov Variation" } } } } }, "Bg2": { "Bg7": { "e3": { "d6": { "Nge2": { "Nh6": { "_metadata": { "eco": "A25", "name": "English Opening: Closed, Taimanov Variation" } }, "Be6": { "_metadata": { "eco": "A25", "name": "English Opening: King's English Variation, Bremen-Hort Variation" } } } } }, "d3": { "_metadata": { "eco": "A25", "name": "English Opening: King's English Variation, Closed System" }, "d6": { "e4": { "_metadata": { "eco": "A26", "name": "English Opening: King's English Variation, Botvinnik System" } }, "_metadata": { "eco": "A26", "name": "English Opening: King's English Variation, Closed System, Full Symmetry" } } }, "Rb1": { "_metadata": { "eco": "A25", "name": "English Opening: King's English Variation, Hungarian Attack" } }, "_metadata": { "eco": "A25", "name": "English Opening: King's English Variation, Taimanov Variation" } } } } }, "_metadata": { "eco": "A25", "name": "English Opening: King's English Variation, Reversed Closed Sicilian" }, "Nf3": { "_metadata": { "eco": "A27", "name": "English Opening: King's English Variation, Three Knights System" } } }, "Nf6": { "g3": { "_metadata": { "eco": "A22", "name": "English Opening: Carls-Bremen System" }, "d5": { "_metadata": { "eco": "A22", "name": "English Opening: King's English Variation, Two Knights Variation, Reversed Dragon" } }, "Bb4": { "_metadata": { "eco": "A22", "name": "English Opening: King's English Variation, Two Knights Variation, Smyslov System" }, "Bg2": { "O-O": { "Nf3": { "Re8": { "O-O": { "e4": { "Nd4": { "Nc6": { "_metadata": { "eco": "A29", "name": "English Opening: King's English Variation, Four Knights Variation, Fianchetto Line, Delayed .. Nc6" } } } } } } } } } }, "c6": { "_metadata": { "eco": "A23", "name": "English Opening: King's English Variation, Two Knights Variation, Keres Variation" } }, "Bc5": { "Bg2": { "c6": { "_metadata": { "eco": "A23", "name": "English Opening: King's English Variation, Two Knights Variation, Keres Variation" } } } }, "g6": { "_metadata": { "eco": "A24", "name": "English Opening: King's English Variation, Two Knights Variation, Fianchetto Line" } } }, "Nf3": { "e4": { "Ng5": { "c6": { "_metadata": { "eco": "A22", "name": "English Opening: King's English Variation, Adhiban Gambit" } }, "b5": { "_metadata": { "eco": "A22", "name": "English Opening: King's English Variation, Bellon Gambit" } }, "Ng4": { "_metadata": { "eco": "A22", "name": "English Opening: King's English, Erbenheimer Gambit" } } } }, "Nc6": { "e4": { "_metadata": { "eco": "A28", "name": "English Opening: Four Knights System, Nimzowitsch Variation" } }, "_metadata": { "eco": "A28", "name": "English Opening: King's English Variation, Four Knights Variation" }, "d4": { "exd4": { "Nxd4": { "Bb4": { "Bg5": { "h6": { "Bh4": { "Bxc3+": { "bxc3": { "Ne5": { "_metadata": { "eco": "A28", "name": "English Opening: King's English Variation, Four Knights Variation" } } } } } } } } } }, "e4": { "_metadata": { "eco": "A28", "name": "English Opening: King's English Variation, Four Knights Variation, Bradley Beach Variation" } } }, "d3": { "_metadata": { "eco": "A28", "name": "English Opening: King's English Variation, Four Knights Variation, Flexible Line" } }, "a3": { "_metadata": { "eco": "A28", "name": "English Opening: King's English Variation, Four Knights Variation, Korchnoi Line" } }, "e3": { "_metadata": { "eco": "A28", "name": "English Opening: King's English Variation, Four Knights Variation, Quiet Line" }, "Bb4": { "Qc2": { "Bxc3": { "_metadata": { "eco": "A28", "name": "English Opening: King's English Variation, Four Knights Variation, Quiet Line" } }, "O-O": { "Nd5": { "Re8": { "Qf5": { "_metadata": { "eco": "A28", "name": "English Opening: King's English Variation, Four Knights Variation, Quiet Line" } } } } } } } }, "g3": { "_metadata": { "eco": "A29", "name": "English Opening: King's English Variation, Four Knights Variation, Fianchetto Line" }, "d5": { "cxd5": { "Nxd5": { "Bg2": { "Bc5": { "_metadata": { "eco": "A29", "name": "English Opening: King's English Variation, Four Knights Variation, Fianchetto Line, with Bc5" } }, "Nb6": { "_metadata": { "eco": "A29", "name": "English Opening: King's English Variation, Four Knights Variation, Fianchetto Line, with Nb6" } } } } } } } } }, "_metadata": { "eco": "A22", "name": "English Opening: King's English Variation, Two Knights Variation" }, "f4": { "_metadata": { "eco": "A22", "name": "English Opening: King's English, Mazedonisch" } } } } }, "c5": { "_metadata": { "eco": "A30", "name": "English Opening: Symmetrical Variation" }, "Nf3": { "_metadata": { "eco": "A30", "name": "English Opening: Symmetrical Variation" }, "Nf6": { "b4": { "_metadata": { "eco": "A30", "name": "English Opening: Symmetrical Variation, Napolitano Gambit" } }, "Nc3": { "Nc6": { "g3": { "d5": { "d4": { "cxd4": { "_metadata": { "eco": "A34", "name": "English Opening: Symmetrical Variation" } }, "e6": { "_metadata": { "eco": "D41", "name": "Queen's Gambit Declined: Semi-Tarrasch Defense" } } } } } }, "d5": { "cxd5": { "Nxd5": { "g3": { "Nc6": { "Bg2": { "Nc7": { "_metadata": { "eco": "A34", "name": "English Opening: Symmetrical Variation, Rubinstein Variation" } } } } } } } } } } }, "b4": { "_metadata": { "eco": "A30", "name": "English Opening: Wing Gambit" } }, "Nc3": { "_metadata": { "eco": "A34", "name": "English Opening: Symmetrical Variation, Normal Variation" }, "Nf6": { "Nf3": { "_metadata": { "eco": "A34", "name": "English Opening: Symmetrical Variation, Three Knights Variation" }, "e5": { "_metadata": { "eco": "A35", "name": "English Opening: Symmetrical Variation" } } } }, "Nc6": { "_metadata": { "eco": "A35", "name": "English Opening: Symmetrical Variation, Two Knights Variation" }, "g3": { "g6": { "Bg2": { "Bg7": { "e3": { "e5": { "_metadata": { "eco": "A36", "name": "English Opening: Symmetrical Variation, Botvinnik System Reversed, with e3" } } }, "Nf3": { "e5": { "_metadata": { "eco": "A37", "name": "English Opening: Symmetrical Variation, Botvinnik System Reversed, with Nf3" } }, "_metadata": { "eco": "A37", "name": "English Opening: Symmetrical Variation, Three Knights, Fianchetto Variation" }, "Nf6": { "O-O": { "O-O": { "b3": { "_metadata": { "eco": "A38", "name": "English Opening: Symmetrical Variation, Double Fianchetto" } } } } } } } } }, "_metadata": { "eco": "A36", "name": "English Opening: Symmetrical Variation, Two Knights, Fianchetto Variation" } } } }, "e4": { "Nc6": { "Nc3": { "g6": { "g3": { "Bg7": { "Bg2": { "_metadata": { "eco": "A36", "name": "English Opening: Symmetrical Variation, Botvinnik System" } } } } } } } }, "g3": { "g6": { "Bg2": { "Bg7": { "Nc3": { "Nc6": { "_metadata": { "eco": "A36", "name": "English Opening: Symmetrical Variation, Ultra-Symmetrical Variation" } } } } } } } } }, "d4": { "Na6": { "_metadata": { "eco": "A40", "name": "Australian Defense" } }, "e6": { "c4": { "c5": { "d5": { "exd5": { "cxd5": { "d6": { "Nc3": { "g6": { "e4": { "Bg7": { "Nf3": { "Ne7": { "_metadata": { "eco": "A40", "name": "Benoni Defense: Franco-Sicilian Hybrid" } } } } } } } } } } } }, "b6": { "_metadata": { "eco": "A40", "name": "English Defense" }, "e4": { "Bb7": { "Bd3": { "Nc6": { "_metadata": { "eco": "A40", "name": "English Defense: Perrin Variation" } } }, "f3": { "f5": { "exf5": { "Nh6": { "_metadata": { "eco": "A40", "name": "English Defense: Poli Gambit" } } } } } } }, "Nc3": { "d5": { "_metadata": { "eco": "D31", "name": "Queen's Gambit Declined: Alapin Variation" } } } }, "e5": { "_metadata": { "eco": "A40", "name": "Horwitz Defense: Zilbermints Gambit" } }, "Bb4+": { "_metadata": { "eco": "A40", "name": "Kangaroo Defense" }, "Nc3": { "_metadata": { "eco": "A40", "name": "Kangaroo Defense: Keres Defense, Transpositional Variation" } } }, "Nf6": { "Nf3": { "d5": { "g3": { "Be7": { "Bg2": { "O-O": { "O-O": { "Nbd7": { "Qc2": { "c6": { "Rd1": { "b6": { "a4": { "_metadata": { "eco": "E08", "name": "Catalan Opening: Closed, Zagoryansky Variation" } } } } } } } } } } } } } } } }, "_metadata": { "eco": "A40", "name": "Horwitz Defense" }, "e4": { "d6": { "_metadata": { "eco": "C00", "name": "Rat Defense: Small Center Defense" } } } }, "g5": { "_metadata": { "eco": "A40", "name": "Borg Defense: Borg Gambit" } }, "g6": { "Nf3": { "Bg7": { "e3": { "c5": { "Bd3": { "Qa5+": { "_metadata": { "eco": "A40", "name": "Colle System: Pterodactyl Variation" } }, "cxd4": { "Nxd4": { "Qa5+": { "_metadata": { "eco": "A40", "name": "Colle System: Siroccopteryx Variation" } } } } } } }, "g3": { "c5": { "Bg2": { "Qa5+": { "_metadata": { "eco": "A40", "name": "Pterodactyl Defense: Fianchetto, Queen Pterodactyl" } } } } }, "Nc3": { "d5": { "_metadata": { "eco": "D00", "name": "Queen's Pawn Game: Chigorin Variation, Fianchetto Defense" } } }, "Bf4": { "c5": { "c3": { "cxd4": { "cxd4": { "Qa5+": { "_metadata": { "eco": "D02", "name": "Queen's Pawn Game: London System, Pterodactyl Variation" } } } } } } } } }, "c4": { "Bg7": { "Nc3": { "c5": { "d5": { "Bxc3+": { "bxc3": { "f5": { "_metadata": { "eco": "A40", "name": "Modern Defense: Beefeater Variation" } }, "Qa5": { "_metadata": { "eco": "A40", "name": "Pterodactyl Defense: Fianchetto, Queen Pteranodon" } } } }, "d6": { "e4": { "Bxc3+": { "bxc3": { "Qa5": { "_metadata": { "eco": "A40", "name": "Pterodactyl Defense: Central, Benoni Beefeater Pterodactyl" } } } } } }, "Qa5": { "_metadata": { "eco": "A40", "name": "Pterodactyl Defense: Fianchetto, Queen Benoni Pterodactyl" } } }, "e3": { "_metadata": { "eco": "A40", "name": "Pterodactyl Defense: Queen Pterodactyl, Quiet Line" } } }, "d6": { "_metadata": { "eco": "A41", "name": "Modern Defense" }, "e4": { "_metadata": { "eco": "A42", "name": "Modern Defense: Averbakh System" }, "Nc6": { "_metadata": { "eco": "A42", "name": "Modern Defense: Kotov Variation" } }, "f5": { "_metadata": { "eco": "A42", "name": "Modern Defense: Randspringer Variation" } } } } }, "e4": { "c5": { "d5": { "Qa5+": { "_metadata": { "eco": "A40", "name": "Pterodactyl Defense: Central, Benoni Pterodactyl" } } } }, "e5": { "_metadata": { "eco": "A41", "name": "Modern Defense: Neo-Modern Defense" } }, "d6": { "Be3": { "Nf6": { "f3": { "_metadata": { "eco": "A42", "name": "Modern Defense: Averbakh Variation, Pseudo-S\u00e4misch" } } } }, "Nc3": { "c5": { "Nge2": { "Qa5": { "_metadata": { "eco": "A42", "name": "Pterodactyl Defense: Central, Bogolubovia" } } } } } } } } }, "h4": { "Nf6": { "h5": { "_metadata": { "eco": "A40", "name": "Modern Defense: Lizard Defense, Pirc-Diemer Gambit" } } } }, "_metadata": { "eco": "A40", "name": "Queen's Pawn Game: Modern Defense" }, "e4": { "Bg7": { "Nc3": { "c5": { "d5": { "_metadata": { "eco": "B06", "name": "Pterodactyl Defense: Eastern, Benoni" } } } } } }, "Nc3": { "Bg7": { "e4": { "c5": { "d5": { "Qa5": { "_metadata": { "eco": "B06", "name": "Pterodactyl Defense: Eastern, Benoni Pterodactyl" } } } } } } } }, "b6": { "_metadata": { "eco": "A40", "name": "English Defense" }, "c4": { "Bb7": { "Nc3": { "e5": { "_metadata": { "eco": "A40", "name": "English Defense: Eastbourne Gambit" } } } } } }, "e5": { "_metadata": { "eco": "A40", "name": "Englund Gambit" }, "d5": { "_metadata": { "eco": "A40", "name": "Englund Gambit Declined" }, "Bc5": { "e4": { "Qh4": { "_metadata": { "eco": "A40", "name": "Englund Gambit Declined: Diemer Counterattack" } } } } }, "Nf3": { "_metadata": { "eco": "A40", "name": "Englund Gambit Declined: Reversed Alekhine" }, "e4": { "Ng1": { "_metadata": { "eco": "A40", "name": "Englund Gambit Declined: Reversed Brooklyn" } }, "_metadata": { "eco": "A40", "name": "Englund Gambit Declined: Reversed Krebs" }, "Ne5": { "_metadata": { "eco": "A40", "name": "Englund Gambit Declined: Reversed Mokele Mbembe" } } } }, "e3": { "_metadata": { "eco": "A40", "name": "Englund Gambit Declined: Reversed French" } }, "dxe5": { "Nc6": { "Nf3": { "Bc5": { "_metadata": { "eco": "A40", "name": "Englund Gambit: Felbecker Gambit" } }, "Qe7": { "_metadata": { "eco": "A40", "name": "Englund Gambit: Main Line" }, "Qd5": { "_metadata": { "eco": "A40", "name": "Englund Gambit: Stockholm Variation" } } }, "f6": { "_metadata": { "eco": "A40", "name": "Englund Gambit: Soller Gambit Deferred" } }, "Nge7": { "_metadata": { "eco": "A40", "name": "Englund Gambit: Zilbermints Gambit" } } } }, "d6": { "_metadata": { "eco": "A40", "name": "Englund Gambit: Hartlaub-Charlick Gambit" } }, "Qh4": { "_metadata": { "eco": "A40", "name": "Englund Gambit: Mosquito Gambit" } }, "f6": { "_metadata": { "eco": "A40", "name": "Englund Gambit: Soller Gambit" } } } }, "Nc6": { "_metadata": { "eco": "A40", "name": "Mikenas Defense" }, "c4": { "e5": { "d5": { "Nd4": { "_metadata": { "eco": "A40", "name": "Mikenas Defense: Cannstatter Variation" } }, "Nce7": { "_metadata": { "eco": "A40", "name": "Mikenas Defense: Lithuanian Variation" } } }, "dxe5": { "Nxe5": { "Nc3": { "Nxc4": { "_metadata": { "eco": "A40", "name": "Mikenas Defense: Pozarek Gambit" } } } } } } }, "d5": { "Nb8": { "_metadata": { "eco": "A40", "name": "Montevideo Defense" }, "e4": { "Nf6": { "e5": { "Ng8": { "_metadata": { "eco": "A40", "name": "Zaire Defense" } } } } } } } }, "b5": { "_metadata": { "eco": "A40", "name": "Polish Defense" }, "e4": { "Bb7": { "Bxb5": { "_metadata": { "eco": "A40", "name": "Polish Defense: Spassky Gambit Accepted" } } } } }, "_metadata": { "eco": "A40", "name": "Queen's Pawn Game" }, "c6": { "c4": { "d6": { "_metadata": { "eco": "A40", "name": "Queen's Pawn Game: Anglo-Slav Opening" } } }, "Nf3": { "Nf6": { "c4": { "b5": { "_metadata": { "eco": "A40", "name": "Slav Indian: Kudischewitsch Gambit" } } } } } }, "d6": { "c4": { "_metadata": { "eco": "A41", "name": "Old Indian Defense" }, "e5": { "_metadata": { "eco": "A41", "name": "Rat Defense: English Rat" }, "dxe5": { "Nc6": { "_metadata": { "eco": "A41", "name": "Rat Defense: English Rat, Lisbon Gambit" } }, "Be6": { "_metadata": { "eco": "A41", "name": "Rat Defense: English Rat, Pounds Gambit" } } } } }, "_metadata": { "eco": "A41", "name": "Queen's Pawn Game" }, "Nf3": { "g6": { "c4": { "Bg7": { "e4": { "Bg4": { "_metadata": { "eco": "A41", "name": "Robatsch Defense" } } } } } }, "Bg4": { "_metadata": { "eco": "A41", "name": "Wade Defense" }, "c4": { "Nd7": { "Qb3": { "Rb8": { "_metadata": { "eco": "A41", "name": "Zukertort Opening: Wade Defense, Chigorin Plan" } } } } } } } }, "c5": { "dxc5": { "_metadata": { "eco": "A43", "name": "Benoni Defense: Benoni Gambit Accepted" }, "Na6": { "_metadata": { "eco": "A43", "name": "Benoni Defense: Benoni Gambit, Schlenker Defense" } }, "b6": { "_metadata": { "eco": "A43", "name": "Benoni Defense: Cormorant Gambit" } } }, "d5": { "Nf6": { "_metadata": { "eco": "A43", "name": "Benoni Defense: Benoni-Indian Defense" }, "Nf3": { "_metadata": { "eco": "A43", "name": "Benoni Defense: Benoni-Indian Defense, Kingside Move Order" } }, "Nc3": { "Qa5": { "_metadata": { "eco": "A43", "name": "Benoni Defense: Woozle" } } } }, "f5": { "e4": { "_metadata": { "eco": "A43", "name": "Benoni Defense: Benoni-Staunton Gambit" } }, "_metadata": { "eco": "A43", "name": "Benoni Defense: Old Benoni, Mujannah Formation" } }, "_metadata": { "eco": "A43", "name": "Benoni Defense: Old Benoni" }, "d6": { "_metadata": { "eco": "A43", "name": "Benoni Defense: Old Benoni" }, "Nc3": { "g6": { "_metadata": { "eco": "A43", "name": "Benoni Defense: Old Benoni, Schmid Variation" } } } }, "Na6": { "_metadata": { "eco": "A43", "name": "Benoni Defense: Snail Variation" } }, "e5": { "_metadata": { "eco": "A44", "name": "Benoni Defense: Old Benoni" }, "e4": { "d6": { "_metadata": { "eco": "A44", "name": "Benoni Defense: Semi-Benoni" } } } } }, "_metadata": { "eco": "A43", "name": "Benoni Defense: Old Benoni" }, "b4": { "_metadata": { "eco": "A43", "name": "Benoni Defense: Zilbermints-Benoni Gambit" } }, "Nf3": { "cxd4": { "b4": { "_metadata": { "eco": "A43", "name": "Benoni Defense: Zilbermints-Benoni Gambit" }, "e5": { "_metadata": { "eco": "A43", "name": "Benoni Defense: Zilbermints-Benoni Gambit, Tamarkin Countergambit" } } } } }, "c4": { "cxd4": { "e3": { "_metadata": { "eco": "A43", "name": "Queen's Pawn Game: Liedmann Gambit" } } } } }, "Nf6": { "Nf3": { "c5": { "d5": { "c4": { "_metadata": { "eco": "A43", "name": "Benoni Defense: Hawk Variation" } }, "b5": { "_metadata": { "eco": "A43", "name": "Indian Defense: Pseudo-Benko" } } }, "_metadata": { "eco": "A46", "name": "Indian Defense: Spielmann-Indian" } }, "Ne4": { "_metadata": { "eco": "A46", "name": "D\u00f6ry Defense" } }, "c6": { "_metadata": { "eco": "A46", "name": "Indian Defense: Czech-Indian" } }, "_metadata": { "eco": "A46", "name": "Indian Defense: Knights Variation" }, "a6": { "_metadata": { "eco": "A46", "name": "Indian Defense: Knights Variation, Alburt-Miles Variation" } }, "e6": { "Bf4": { "_metadata": { "eco": "A46", "name": "Indian Defense: London System" } }, "Bg5": { "d5": { "e3": { "c5": { "c3": { "Qb6": { "_metadata": { "eco": "A46", "name": "Queen's Pawn Game: Torre Attack, Breyer Variation" } } } } } }, "_metadata": { "eco": "A46", "name": "Torre Attack: Classical Defense" }, "h6": { "_metadata": { "eco": "A46", "name": "Torre Attack: Classical Defense, Nimzowitsch Variation" } }, "c5": { "e3": { "b6": { "d5": { "_metadata": { "eco": "A46", "name": "Torre Attack: Classical Defense, Petrosian Gambit" } } } }, "e4": { "_metadata": { "eco": "A46", "name": "Torre Attack: Wagner Gambit" } } } }, "Nc3": { "d5": { "Bg5": { "_metadata": { "eco": "A46", "name": "Queen's Pawn Game: Veresov Attack, Classical Defense" } } } }, "e3": { "_metadata": { "eco": "A46", "name": "Yusupov-Rubinstein System" }, "c5": { "Bd3": { "d5": { "c3": { "_metadata": { "eco": "D05", "name": "Queen's Pawn Game: Colle System, Traditional Colle" } }, "b3": { "_metadata": { "eco": "D05", "name": "Rubinstein Opening" }, "Nc6": { "O-O": { "Bd6": { "Bb2": { "O-O": { "_metadata": { "eco": "D05", "name": "Rubinstein Opening: Bogoljubow Defense" } } } }, "Be7": { "Bb2": { "O-O": { "_metadata": { "eco": "D05", "name": "Rubinstein Opening: Classical Defense" } } } } } } } } } } }, "c4": { "d5": { "Bg5": { "c6": { "Nbd2": { "Nbd7": { "e3": { "_metadata": { "eco": "D30", "name": "Queen's Gambit Declined: Capablanca Variation" } } } } } } } } }, "b5": { "_metadata": { "eco": "A46", "name": "Indian Defense: Polish Variation" } }, "d6": { "_metadata": { "eco": "A46", "name": "Indian Defense: Wade-Tartakower Defense" } }, "b6": { "c3": { "e5": { "_metadata": { "eco": "A47", "name": "Indian Defense: Schnepper Gambit" } } }, "g3": { "Bb7": { "Bg2": { "c5": { "_metadata": { "eco": "A47", "name": "Marienbad System" }, "c4": { "cxd4": { "Qxd4": { "_metadata": { "eco": "A47", "name": "Marienbad System: Berg Variation" } } } } } } } }, "_metadata": { "eco": "A47", "name": "Pseudo Queen's Indian Defense" } }, "g6": { "_metadata": { "eco": "A48", "name": "East Indian Defense" }, "e3": { "Bg7": { "Bd3": { "d6": { "_metadata": { "eco": "A48", "name": "Indian Defense: Colle System, King's Indian Variation" } } } } }, "Bf4": { "_metadata": { "eco": "A48", "name": "London System" } }, "Nc3": { "d5": { "Bf4": { "_metadata": { "eco": "A48", "name": "Queen's Pawn Game: Barry Attack" }, "Bg7": { "_metadata": { "eco": "A48", "name": "Queen's Pawn Game: Barry Attack" }, "e3": { "O-O": { "Be2": { "_metadata": { "eco": "A48", "name": "Queen's Pawn Game: Barry Attack, Gr\u00fcnfeld Variation" } } } }, "Qd2": { "_metadata": { "eco": "A48", "name": "Queen's Pawn Game: Barry Attack, Tarzan Attack" } } } } } }, "Bg5": { "Bg7": { "Nbd2": { "d5": { "e3": { "O-O": { "_metadata": { "eco": "A48", "name": "Queen's Pawn Game: Torre Attack, Gr\u00fcnfeld Variation, Main Line" } } } }, "c5": { "_metadata": { "eco": "A48", "name": "Torre Attack: Fianchetto Defense, Euwe Variation" } } } }, "_metadata": { "eco": "A48", "name": "Torre Attack: Fianchetto Defense" } }, "g3": { "_metadata": { "eco": "A49", "name": "Indian Defense: Przepiorka Variation" }, "Bg7": { "Bg2": { "O-O": { "O-O": { "d5": { "c4": { "_metadata": { "eco": "D77", "name": "Neo-Gr\u00fcnfeld Defense: Classical Variation" }, "dxc4": { "_metadata": { "eco": "D77", "name": "Neo-Gr\u00fcnfeld Defense: Classical Variation, Modern Defense" } }, "Nc6": { "_metadata": { "eco": "D77", "name": "Neo-Gr\u00fcnfeld Defense: Classical Variation, Polgar Variation" } } } } } } } } }, "c4": { "Bg7": { "g3": { "O-O": { "Bg2": { "d5": { "cxd5": { "Nxd5": { "O-O": { "c5": { "dxc5": { "_metadata": { "eco": "D75", "name": "Neo-Gr\u00fcnfeld Defense: Delayed Exchange Variation" } } } } } } } } } }, "Nc3": { "d5": { "cxd5": { "Nxd5": { "e4": { "Nxc3": { "bxc3": { "c5": { "Rb1": { "_metadata": { "eco": "D85", "name": "Gr\u00fcnfeld Defense: Exchange Variation, Modern Exchange Variation" } }, "h3": { "_metadata": { "eco": "D85", "name": "Gr\u00fcnfeld Defense: Exchange Variation, Modern Exchange Variation, Kramnik's Line" } } } } } } } } }, "O-O": { "e3": { "d6": { "Be2": { "Nc6": { "_metadata": { "eco": "E60", "name": "King's Indian Defense: Semi-Classical Variation, Hollywood Variation" } } } } } } } }, "_metadata": { "eco": "E60", "name": "King's Indian Defense: Normal Variation, King's Knight Variation" } } }, "d5": { "Bf4": { "c5": { "e3": { "Qb6": { "Nc3": { "_metadata": { "eco": "D02", "name": "London System: Poisoned Pawn Variation" } } } } } } } }, "Nc3": { "d5": { "Qd3": { "_metadata": { "eco": "A45", "name": "Amazon Attack: Siberian Attack" } }, "_metadata": { "eco": "A45", "name": "Queen's Pawn Game: Chigorin Variation" }, "e4": { "_metadata": { "eco": "D00", "name": "Queen's Pawn Game: H\u00fcbsch Gambit" } }, "Bg5": { "_metadata": { "eco": "D01", "name": "Richter-Veresov Attack" }, "Bf5": { "_metadata": { "eco": "D01", "name": "Richter-Veresov Attack" }, "f3": { "_metadata": { "eco": "D01", "name": "Richter-Veresov Attack: Richter Variation" } }, "Bxf6": { "_metadata": { "eco": "D01", "name": "Richter-Veresov Attack: Veresov Variation" } } }, "Ne4": { "_metadata": { "eco": "D01", "name": "Richter-Veresov Attack: Boyce Defense" } }, "c5": { "Bxf6": { "gxf6": { "e4": { "dxe4": { "d5": { "_metadata": { "eco": "D01", "name": "Richter-Veresov Attack: Malich Gambit" } } } } } } }, "Nbd7": { "Nf3": { "_metadata": { "eco": "D01", "name": "Richter-Veresov Attack: Two Knights System" }, "g6": { "_metadata": { "eco": "D01", "name": "Richter-Veresov Attack: Two Knights System, Gr\u00fcnfeld Defense" } } } } } }, "e5": { "_metadata": { "eco": "A45", "name": "Indian Defense: Maddigan Gambit" } }, "c5": { "_metadata": { "eco": "A45", "name": "Indian Defense: Reversed Chigorin Defense" } } }, "f4": { "_metadata": { "eco": "A45", "name": "Canard Opening" } }, "_metadata": { "eco": "A45", "name": "Indian Defense" }, "f3": { "d5": { "g4": { "_metadata": { "eco": "A45", "name": "Indian Defense: Gedult Attack, Gedult Attack" } }, "e4": { "_metadata": { "eco": "A45", "name": "Indian Defense: Paleface Attack, Blackmar-Diemer Gambit Deferred" } }, "Nc3": { "_metadata": { "eco": "A45", "name": "Queen's Pawn Game: Veresov, Richter Attack" } } }, "_metadata": { "eco": "A45", "name": "Paleface Attack" } }, "g4": { "_metadata": { "eco": "A45", "name": "Indian Defense: Gibbins-Weidenhagen Gambit" }, "Nxg4": { "_metadata": { "eco": "A45", "name": "Indian Defense: Gibbins-Weidenhagen Gambit Accepted" }, "f3": { "Nf6": { "e4": { "_metadata": { "eco": "A45", "name": "Indian Defense: Gibbins-Weidenhagen Gambit, Maltese Falcon" } } } }, "e4": { "d6": { "Be2": { "Nf6": { "Nc3": { "_metadata": { "eco": "A45", "name": "Indian Defense: Gibbins-Weidenhagen Gambit, Stummer Gambit" } } } } } } }, "e5": { "_metadata": { "eco": "A45", "name": "Indian Defense: Gibbins-Weidenhagen Gambit, Oshima Defense" } } }, "Nd2": { "e5": { "_metadata": { "eco": "A45", "name": "Indian Defense: Lazard Gambit" } } }, "e4": { "_metadata": { "eco": "A45", "name": "Indian Defense: Omega Gambit" }, "Nxe4": { "Bd3": { "Nf6": { "Bg5": { "_metadata": { "eco": "A45", "name": "Indian Defense: Omega Gambit, Arafat Gambit" } } } } } }, "d5": { "_metadata": { "eco": "A45", "name": "Indian Defense: Pawn Push Variation" } }, "g3": { "_metadata": { "eco": "A45", "name": "Indian Defense: Tartakower Attack" } }, "Bg5": { "_metadata": { "eco": "A45", "name": "Trompowsky Attack" }, "Ne4": { "Bf4": { "g5": { "_metadata": { "eco": "A45", "name": "Trompowsky Attack: Borg Variation" } } }, "Bh4": { "_metadata": { "eco": "A45", "name": "Trompowsky Attack: Edge Variation" }, "c6": { "Nd2": { "Qa5": { "c3": { "Nxd2": { "Qxd2": { "d5": { "e4": { "_metadata": { "eco": "A45", "name": "Trompowsky Attack: Edge Variation, Hergert Gambit" } } } } } } } } }, "d5": { "f3": { "Nf6": { "Nc3": { "Bf5": { "e4": { "_metadata": { "eco": "A45", "name": "Trompowsky Attack: Edge Variation, Hergert Gambit" } } } } } } } }, "h4": { "_metadata": { "eco": "A45", "name": "Trompowsky Attack: Raptor Variation" }, "Nxg5": { "hxg5": { "e5": { "_metadata": { "eco": "A45", "name": "Trompowsky Attack: Raptor Variation, Hergert Gambit" } } } } } }, "e6": { "_metadata": { "eco": "A45", "name": "Trompowsky Attack: Classical Defense" }, "e4": { "_metadata": { "eco": "A45", "name": "Trompowsky Attack: Classical Defense, Big Center Variation" } } }, "c5": { "d5": { "Qb6": { "Nc3": { "_metadata": { "eco": "A45", "name": "Trompowsky Attack: Poisoned Pawn Variation" } } } } } }, "c4": { "g5": { "_metadata": { "eco": "A50", "name": "Indian Defense: Medusa Gambit" } }, "_metadata": { "eco": "A50", "name": "Indian Defense: Normal Variation" }, "b5": { "_metadata": { "eco": "A50", "name": "Indian Defense: Pyrenees Gambit" } }, "Nc6": { "_metadata": { "eco": "A50", "name": "Mexican Defense" }, "d5": { "Ne5": { "f4": { "_metadata": { "eco": "A50", "name": "Mexican Defense: Horsefly Gambit" } } } } }, "b6": { "_metadata": { "eco": "A50", "name": "Queen's Indian Accelerated" } }, "c6": { "_metadata": { "eco": "A50", "name": "Slav Indian" } }, "e5": { "_metadata": { "eco": "A51", "name": "Indian Defense: Budapest Defense" }, "dxe5": { "Ne4": { "a3": { "b6": { "_metadata": { "eco": "A51", "name": "Indian Defense: Budapest Defense, Fajarowicz Defense, Bonsdorf Variation" } } }, "_metadata": { "eco": "A51", "name": "Indian Defense: Budapest Defense, Fajarowicz Variation" }, "Qc2": { "_metadata": { "eco": "A51", "name": "Indian Defense: Budapest Defense, Fajarowicz-Steiner Variation" } } }, "Ng4": { "_metadata": { "eco": "A52", "name": "Indian Defense: Budapest Defense" }, "Nf3": { "_metadata": { "eco": "A52", "name": "Indian Defense: Budapest Defense, Adler Variation" } }, "e4": { "_metadata": { "eco": "A52", "name": "Indian Defense: Budapest Defense, Alekhine Variation" }, "Nxe5": { "f4": { "Nec6": { "_metadata": { "eco": "A52", "name": "Indian Defense: Budapest Defense, Alekhine Variation, Abonyi Variation" } } } }, "d6": { "_metadata": { "eco": "A52", "name": "Indian Defense: Budapest Defense, Alekhine Variation, Tartakower Defense" } } }, "Bf4": { "_metadata": { "eco": "A52", "name": "Indian Defense: Budapest Defense, Rubinstein Variation" } } } } }, "d6": { "_metadata": { "eco": "A53", "name": "Old Indian Defense" }, "g4": { "_metadata": { "eco": "A53", "name": "Old Indian Defense: Aged Gibbon Gambit" } }, "Nc3": { "c6": { "_metadata": { "eco": "A53", "name": "Old Indian Defense: Czech Variation, with Nc3" } }, "Bf5": { "_metadata": { "eco": "A53", "name": "Old Indian Defense: Janowski Variation" }, "g3": { "_metadata": { "eco": "A53", "name": "Old Indian Defense: Janowski Variation, Fianchetto Variation" } }, "e4": { "_metadata": { "eco": "A53", "name": "Old Indian Defense: Janowski Variation, Grinberg Gambit" } }, "f3": { "_metadata": { "eco": "A53", "name": "Old Indian Defense: Janowski Variation, Main Line" } } }, "e5": { "e3": { "Nbd7": { "Bd3": { "_metadata": { "eco": "A54", "name": "Old Indian Defense: Duz-Khotimirsky Variation" } } } }, "Nf3": { "_metadata": { "eco": "A54", "name": "Old Indian Defense: Two Knights Variation" } }, "_metadata": { "eco": "A54", "name": "Old Indian Defense: Ukrainian Variation" } }, "Nbd7": { "e4": { "e5": { "Nf3": { "_metadata": { "eco": "A55", "name": "Old Indian Defense: Normal Variation" }, "g6": { "Be2": { "Bg7": { "O-O": { "O-O": { "_metadata": { "eco": "E94", "name": "King's Indian Defense: Orthodox Variation, Positional Defense" } } } } } } } } } } }, "Nf3": { "c6": { "_metadata": { "eco": "A53", "name": "Old Indian Defense: Czech Variation, with Nf3" } }, "Bg4": { "_metadata": { "eco": "A54", "name": "Old Indian Defense: Tartakower-Indian" } } } }, "c5": { "_metadata": { "eco": "A56", "name": "Benoni Defense" }, "d5": { "e5": { "_metadata": { "eco": "A56", "name": "Benoni Defense: Czech Benoni Defense" }, "Nc3": { "d6": { "e4": { "g6": { "_metadata": { "eco": "A56", "name": "Benoni Defense: King's Indian System" } } } } } }, "d6": { "_metadata": { "eco": "A56", "name": "Benoni Defense: Hrom\u00e1dka System" } }, "Ne4": { "_metadata": { "eco": "A56", "name": "Vulture Defense" } }, "b5": { "_metadata": { "eco": "A57", "name": "Benko Gambit" }, "cxb5": { "a6": { "_metadata": { "eco": "A57", "name": "Benko Gambit Accepted" }, "f3": { "_metadata": { "eco": "A57", "name": "Benko Gambit Accepted: Dlugy Variation" } }, "e3": { "_metadata": { "eco": "A57", "name": "Benko Gambit Accepted: Modern Variation" } }, "b6": { "_metadata": { "eco": "A57", "name": "Benko Gambit Accepted: Pawn Return Variation" } }, "Nc3": { "axb5": { "e4": { "b4": { "Nb5": { "d6": { "Bc4": { "_metadata": { "eco": "A57", "name": "Benko Gambit: Nescafe Frappe Attack" } } }, "_metadata": { "eco": "A57", "name": "Benko Gambit: Zaitsev Variation, Nescafe Frappe Attack" } } } } }, "_metadata": { "eco": "A57", "name": "Benko Gambit: Zaitsev System" } }, "bxa6": { "g6": { "Nc3": { "Bxa6": { "f4": { "_metadata": { "eco": "A58", "name": "Benko Gambit Accepted: Central Storming Variation" } }, "g3": { "d6": { "Bg2": { "Bg7": { "Nf3": { "_metadata": { "eco": "A58", "name": "Benko Gambit Accepted: Fianchetto Variation" } } } } } }, "e4": { "Bxf1": { "Kxf1": { "d6": { "g3": { "_metadata": { "eco": "A59", "name": "Benko Gambit" } }, "Nge2": { "_metadata": { "eco": "A59", "name": "Benko Gambit Accepted: Yugoslav" } } } } } }, "Nf3": { "d6": { "e4": { "Bxf1": { "Kxf1": { "Bg7": { "g3": { "O-O": { "1Kg2": { "_metadata": { "eco": "A59", "name": "Benko Gambit Accepted: King Walk Variation" } } } } } } } } } } } } }, "_metadata": { "eco": "A58", "name": "Benko Gambit Accepted: Fully Accepted Variation" }, "Bxa6": { "Nc3": { "d6": { "Nf3": { "g6": { "g3": { "_metadata": { "eco": "A58", "name": "Benko Gambit: Fianchetto Variation" } }, "Nd2": { "_metadata": { "eco": "A58", "name": "Benko Gambit: Nd2 Variation" } } } }, "e4": { "_metadata": { "eco": "A59", "name": "Benko Gambit Accepted: Yugoslav" } } } } } } } }, "Bg5": { "_metadata": { "eco": "A57", "name": "Benko Gambit Declined: Bishop Attack" } }, "e4": { "_metadata": { "eco": "A57", "name": "Benko Gambit Declined: Hj\u00f8rring Countergambit" } }, "Nf3": { "_metadata": { "eco": "A57", "name": "Benko Gambit Declined: Main Line" } }, "f3": { "_metadata": { "eco": "A57", "name": "Benko Gambit Declined: Pseudo-S\u00e4misch" } }, "Nd2": { "_metadata": { "eco": "A57", "name": "Benko Gambit Declined: Quiet Line" } }, "a4": { "_metadata": { "eco": "A57", "name": "Benko Gambit Declined: Sosonko Variation" } }, "g4": { "_metadata": { "eco": "A57", "name": "Benko Gambit: Mutkin Countergambit" } } }, "e6": { "_metadata": { "eco": "A60", "name": "Benoni Defense: Modern Variation" }, "Nc3": { "exd5": { "cxd5": { "Bd6": { "_metadata": { "eco": "A60", "name": "Benoni Defense: Modern Variation, Snake Variation" } }, "d6": { "e4": { "_metadata": { "eco": "A65", "name": "Benoni Defense: King's Pawn Line" }, "g6": { "f4": { "Bg7": { "e5": { "_metadata": { "eco": "A66", "name": "Benoni Defense: Mikenas Variation" } }, "Bb5+": { "_metadata": { "eco": "A67", "name": "Benoni Defense: Taimanov Variation" } }, "Nf3": { "O-O": { "_metadata": { "eco": "A68", "name": "Benoni Defense: Four Pawns Attack" } } } }, "_metadata": { "eco": "A66", "name": "Benoni Defense: Pawn Storm Variation" } }, "Nf3": { "Bg7": { "Be2": { "O-O": { "_metadata": { "eco": "A72", "name": "Benoni Defense: Classical Variation" }, "O-O": { "_metadata": { "eco": "A73", "name": "Benoni Defense: Classical Variation, Main Line" }, "a6": { "a4": { "_metadata": { "eco": "A74", "name": "Benoni Defense: Classical Variation, Full Line" } } }, "Re8": { "_metadata": { "eco": "A76", "name": "Benoni Defense: Classical Variation, Czerniak Defense" }, "Nd2": { "_metadata": { "eco": "A77", "name": "Benoni Defense: Classical Variation, Czerniak Defense, Tal Line" }, "Na6": { "1f3": { "_metadata": { "eco": "A79", "name": "Benoni Defense: Classical Variation, Czerniak Defense" } } } } } } } } } } } } } } } } } }, "dxc5": { "e6": { "_metadata": { "eco": "A56", "name": "Benoni Defense: Weenink Variation" } } }, "e3": { "g6": { "Nc3": { "Bg7": { "Nf3": { "O-O": { "Be2": { "cxd4": { "exd4": { "d5": { "O-O": { "Nc6": { "_metadata": { "eco": "A56", "name": "Gr\u00fcnfeld Defense: Three Knights Variation, Burille Variation, Reversed Tarrasch" } } } } } } } } } } } } } }, "e6": { "Nf3": { "c5": { "d5": { "exd5": { "cxd5": { "d6": { "Nc3": { "g6": { "_metadata": { "eco": "A61", "name": "Benoni Defense" }, "g3": { "_metadata": { "eco": "A61", "name": "Benoni Defense: Fianchetto Variation" } }, "Nd2": { "_metadata": { "eco": "A61", "name": "Benoni Defense: Knight's Tour Variation" } }, "Bg5": { "_metadata": { "eco": "A61", "name": "Benoni Defense: Uhlmann Variation" } }, "e4": { "_metadata": { "eco": "A70", "name": "Benoni Defense: Classical Variation" }, "Bg7": { "h3": { "_metadata": { "eco": "A70", "name": "Benoni Defense: Classical Variation, New York Variation" } }, "Be2": { "_metadata": { "eco": "A70", "name": "Benoni Defense: Classical Variation, Traditional Variation" }, "O-O": { "O-O": { "a6": { "a4": { "Bg4": { "_metadata": { "eco": "A75", "name": "Benoni Defense: Classical Variation, Argentine Counterattack" } } } }, "Re8": { "Nd2": { "Na6": { "_metadata": { "eco": "A78", "name": "Benoni Defense: Classical Variation, Czerniak Defense" } } } } } } }, "Bg5": { "_metadata": { "eco": "A71", "name": "Benoni Defense: Classical Variation, Averbakh-Grivas Attack" } } } } } } } } }, "b5": { "_metadata": { "eco": "E10", "name": "Blumenfeld Countergambit" }, "dxe6": { "fxe6": { "cxb5": { "d5": { "_metadata": { "eco": "E10", "name": "Blumenfeld Countergambit Accepted" } } } } }, "Bg5": { "_metadata": { "eco": "E10", "name": "Blumenfeld Countergambit: Duz-Khotimirsky Variation" }, "exd5": { "cxd5": { "h6": { "_metadata": { "eco": "E10", "name": "Blumenfeld Countergambit: Spielmann Variation" } } } } } } } }, "d5": { "Bg5": { "h6": { "_metadata": { "eco": "D30", "name": "Queen's Gambit Declined: Capablanca Variation" } }, "_metadata": { "eco": "D30", "name": "Queen's Gambit Declined: Traditional Variation" }, "Bb4+": { "_metadata": { "eco": "D30", "name": "Queen's Gambit Declined: Vienna Variation" } } }, "Nc3": { "Nbd7": { "cxd5": { "exd5": { "Bf4": { "_metadata": { "eco": "D35", "name": "Queen's Gambit Declined: Exchange Variation, S\u00e4misch Variation" } } } }, "_metadata": { "eco": "D37", "name": "Queen's Gambit Declined: Barmen Variation" }, "Bg5": { "h6": { "Bh4": { "dxc4": { "_metadata": { "eco": "D37", "name": "Queen's Gambit Declined: Knight Defense, Alekhine Gambit" } } } } } }, "Be7": { "Bf4": { "_metadata": { "eco": "D37", "name": "Queen's Gambit Declined: Harrwitz Attack" }, "O-O": { "e3": { "c5": { "dxc5": { "Bxc5": { "Qc2": { "Nc6": { "Rd1": { "Qa5": { "a3": { "_metadata": { "eco": "D37", "name": "Queen's Gambit Declined: Harrwitz Attack" } } } }, "a3": { "Qa5": { "O-O-O": { "_metadata": { "eco": "D37", "name": "Queen's Gambit Declined: Harrwitz Attack" } } } } } }, "_metadata": { "eco": "D37", "name": "Queen's Gambit Declined: Harrwitz Attack, Main Line" } } } }, "Nbd7": { "_metadata": { "eco": "D37", "name": "Queen's Gambit Declined: Harrwitz Attack, Two Knights Defense" } } } } }, "Bg5": { "O-O": { "Qc2": { "_metadata": { "eco": "D37", "name": "Queen's Gambit Declined: Miles Variation" } }, "e3": { "h6": { "Bxf6": { "_metadata": { "eco": "D55", "name": "Queen's Gambit Declined: Anti-Tartakower Variation" } }, "_metadata": { "eco": "D55", "name": "Queen's Gambit Declined: Neo-Orthodox Variation" } }, "_metadata": { "eco": "D55", "name": "Queen's Gambit Declined: Modern Variation, Normal Line" }, "Nbd7": { "_metadata": { "eco": "D60", "name": "Queen's Gambit Declined: Orthodox Defense" }, "Bd3": { "_metadata": { "eco": "D60", "name": "Queen's Gambit Declined: Orthodox Defense, Botvinnik Variation" } }, "Qc2": { "_metadata": { "eco": "D61", "name": "Queen's Gambit Declined: Orthodox Defense, Rubinstein Variation" }, "c5": { "cxd5": { "_metadata": { "eco": "D62", "name": "Queen's Gambit Declined: Orthodox Defense, Rubinstein Variation, Flohr Line" } } } }, "Rc1": { "a6": { "_metadata": { "eco": "D63", "name": "Queen's Gambit Declined: Orthodox Defense, Henneberger Variation" }, "cxd5": { "_metadata": { "eco": "D63", "name": "Queen's Gambit Declined: Orthodox Defense, Swiss, Carlsbad Variation" } } }, "_metadata": { "eco": "D63", "name": "Queen's Gambit Declined: Orthodox Defense, Main Line" }, "c6": { "_metadata": { "eco": "D63", "name": "Queen's Gambit Declined: Orthodox Defense, Main Line" }, "Qc2": { "_metadata": { "eco": "D64", "name": "Queen's Gambit Declined: Orthodox Defense, Rubinstein Attack" }, "a6": { "_metadata": { "eco": "D64", "name": "Queen's Gambit Declined: Orthodox Defense, Rubinstein Attack" } } }, "Bd3": { "dxc4": { "Bxc4": { "Nd5": { "Bxe7": { "Qxe7": { "1O-O": { "Nxc3": { "1Rxc3": { "e5": { "1Qc2": { "_metadata": { "eco": "D68", "name": "Queen's Gambit Declined: Orthodox Defense, Classical Variation" } } } } } } } } } } } } } } } } }, "h6": { "Bxf6": { "Bxf6": { "e3": { "O-O": { "Rc1": { "c6": { "Bd3": { "Nd7": { "O-O": { "dxc4": { "1Bxc4": { "_metadata": { "eco": "D55", "name": "Queen's Gambit Declined: Anti-Tartakower Variation, Petrosian Variation" } } } } } } } } } } } }, "Bh4": { "O-O": { "e3": { "_metadata": { "eco": "D55", "name": "Queen's Gambit Declined: Neo-Orthodox Variation, Main Line" }, "Ne4": { "Bxe7": { "Qxe7": { "Qc2": { "_metadata": { "eco": "D56", "name": "Queen's Gambit Declined: Lasker Defense, Teichmann Variation" } } } } }, "b6": { "_metadata": { "eco": "D58", "name": "Queen's Gambit Declined: Tartakower Defense" } } } } } } } }, "_metadata": { "eco": "D37", "name": "Queen's Gambit Declined: Three Knights Variation" }, "dxc4": { "_metadata": { "eco": "D37", "name": "Queen's Gambit Declined: Three Knights, Vienna Variation" }, "e3": { "_metadata": { "eco": "D37", "name": "Queen's Gambit Declined: Vienna Variation, Quiet Variation" } } }, "Bb4": { "_metadata": { "eco": "D38", "name": "Queen's Gambit Declined: Ragozin Defense" }, "Qa4+": { "_metadata": { "eco": "D38", "name": "Queen's Gambit Declined: Ragozin Defense, Alekhine Variation" } }, "Bg5": { "Nbd7": { "e3": { "c5": { "_metadata": { "eco": "D38", "name": "Queen's Gambit Declined: Westphalian Variation" } } } }, "dxc4": { "_metadata": { "eco": "D39", "name": "Queen's Gambit Declined: Ragozin Defense, Vienna Variation" } } } }, "c5": { "_metadata": { "eco": "D40", "name": "Queen's Gambit Declined: Semi-Tarrasch Defense" }, "cxd5": { "_metadata": { "eco": "D41", "name": "Queen's Gambit Declined: Semi-Tarrasch Defense" }, "Nxd5": { "e4": { "_metadata": { "eco": "D41", "name": "Queen's Gambit Declined: Semi-Tarrasch Defense, Exchange Variation" } }, "e3": { "_metadata": { "eco": "D41", "name": "Queen's Gambit Declined: Semi-Tarrasch Defense, Pillsbury Variation" }, "Nc6": { "Bd3": { "_metadata": { "eco": "D42", "name": "Queen's Gambit Declined: Semi-Tarrasch Defense, Main Line" } } } } } } }, "c6": { "Bg5": { "dxc4": { "e4": { "b5": { "e5": { "h6": { "Bh4": { "g5": { "Nxg5": { "Nd5": { "_metadata": { "eco": "D44", "name": "Semi-Slav Defense: Botvinnik Variation, Alatortsev System" } }, "hxg5": { "Bxg5": { "Nbd7": { "1Qf3": { "_metadata": { "eco": "D44", "name": "Semi-Slav Defense: Botvinnik Variation, Szabo Variation" } } } } } } } } } } } } } } } }, "g3": { "c6": { "Bg2": { "dxc4": { "_metadata": { "eco": "E04", "name": "Catalan Opening: Open Defense" } } } }, "Be7": { "Bg2": { "O-O": { "O-O": { "dxc4": { "_metadata": { "eco": "E05", "name": "Catalan Opening: Open Defense, Classical Line" } }, "Nbd7": { "Qc2": { "c6": { "Nbd2": { "b6": { "_metadata": { "eco": "E09", "name": "Catalan Opening: Closed Variation, Traditional Variation" } }, "_metadata": { "eco": "E09", "name": "Catalan Opening: Closed, Main Line" } }, "Bf4": { "b6": { "Nbd2": { "Bb7": { "e4": { "dxe4": { "1Nxe4": { "Nxe4": { "1Qxe4": { "_metadata": { "eco": "E09", "name": "Catalan Opening: Closed, Main Line" } } } } } } } } } } } } }, "c6": { "Qc2": { "b6": { "Nbd2": { "Bb7": { "e4": { "Nbd7": { "_metadata": { "eco": "E09", "name": "Catalan Opening: Closed, Main Line" } } } } } } } } } } } }, "Bb4+": { "Bd2": { "Be7": { "Bg2": { "O-O": { "O-O": { "c6": { "Bf4": { "b6": { "_metadata": { "eco": "E06", "name": "Catalan Opening: Closed" } } }, "Qc2": { "Nbd7": { "Bf4": { "b6": { "Nbd2": { "_metadata": { "eco": "E11", "name": "Bogo-Indian Defense: Retreat Variation" }, "Ba6": { "_metadata": { "eco": "E11", "name": "Bogo-Indian Defense: Retreat Variation" } } } } } } } } } } } } } } } }, "b6": { "Nc3": { "d5": { "cxd5": { "exd5": { "Bg5": { "Be7": { "e3": { "O-O": { "Bd3": { "Bb7": { "Ne5": { "_metadata": { "eco": "D55", "name": "Queen's Gambit Declined: Pillsbury Attack" } } } } } } } } } } }, "_metadata": { "eco": "E12", "name": "Queen's Indian Defense: Kasparov Variation" }, "Bb7": { "Bg5": { "h6": { "Bh4": { "g5": { "Bg3": { "Nh5": { "_metadata": { "eco": "E12", "name": "Queen's Indian Defense: Kasparov Variation, Botvinnik Attack" } } } } } } }, "a3": { "d5": { "cxd5": { "Nxd5": { "e4": { "_metadata": { "eco": "E12", "name": "Queen's Indian Defense: Kasparov-Petrosian Variation, Polovodin Gambit" } } } } } } }, "Bb4": { "Bg5": { "h6": { "Bh4": { "Bb7": { "_metadata": { "eco": "E13", "name": "Queen's Indian Defense: Kasparov Variation" } } } } } } }, "g3": { "Bb7": { "Bg2": { "Bb4+": { "Bd2": { "Bxd2+": { "Qxd2": { "O-O": { "Nc3": { "Ne4": { "Qc2": { "Nxc3": { "Ng5": { "_metadata": { "eco": "E11", "name": "Bogo-Indian Defense: Monticelli Trap" } } } } } } } } }, "Be7": { "_metadata": { "eco": "E16", "name": "Queen's Indian Defense: Riumin Variation" } } }, "_metadata": { "eco": "E16", "name": "Queen's Indian Defense: Capablanca Variation" } }, "c5": { "d5": { "exd5": { "Ng5": { "_metadata": { "eco": "E15", "name": "Queen's Indian Defense: Buerger Variation" } }, "Nh4": { "_metadata": { "eco": "E15", "name": "Queen's Indian Defense: Fianchetto Variation, Rubinstein Variation" } } } }, "_metadata": { "eco": "E15", "name": "Queen's Indian Defense: Fianchetto Variation, S\u00e4misch Variation" } }, "Be7": { "Nc3": { "_metadata": { "eco": "E17", "name": "Queen's Indian Defense: Anti-Queen's Indian System" }, "Ne4": { "Bd2": { "_metadata": { "eco": "E17", "name": "Queen's Indian Defense: Opocensky Variation" } } } }, "O-O": { "_metadata": { "eco": "E17", "name": "Queen's Indian Defense: Classical Variation" }, "O-O": { "d5": { "exd5": { "Nh4": { "_metadata": { "eco": "E17", "name": "Queen's Indian Defense: Classical Variation, Polugaevsky Gambit" } }, "Nd4": { "_metadata": { "eco": "E17", "name": "Queen's Indian Defense: Classical Variation, Taimanov Gambit" } } } }, "b3": { "_metadata": { "eco": "E17", "name": "Queen's Indian Defense: Euwe Variation" } }, "Re1": { "_metadata": { "eco": "E17", "name": "Queen's Indian Defense: Fianchetto Variation, Kramnik Variation" } }, "Nc3": { "Na6": { "_metadata": { "eco": "E18", "name": "Queen's Indian Defense: Classical Variation, Tiviakov Defense" } }, "_metadata": { "eco": "E18", "name": "Queen's Indian Defense: Classical Variation, Traditional Variation" }, "d5": { "_metadata": { "eco": "E18", "name": "Queen's Indian Defense: Classical Variation, Traditional Variation, Nimzowitsch Line" } }, "Ne4": { "Qc2": { "Nxc3": { "Qxc3": { "_metadata": { "eco": "E19", "name": "Queen's Indian Defense: Classical Variation, Traditional Variation, Main Line" } } } } } } } }, "_metadata": { "eco": "E17", "name": "Queen's Indian Defense: Traditional Variation" } } }, "_metadata": { "eco": "E15", "name": "Queen's Indian Defense: Fianchetto Variation, Traditional Line" } }, "_metadata": { "eco": "E15", "name": "Queen's Indian Defense: Fianchetto Variation" }, "Ba6": { "b3": { "Bb4+": { "_metadata": { "eco": "E15", "name": "Queen's Indian Defense: Fianchetto Variation, Check Variation" }, "Bd2": { "Be7": { "_metadata": { "eco": "E15", "name": "Queen's Indian Defense: Fianchetto Variation, Check Variation, Intermezzo Line" } }, "Qe7": { "_metadata": { "eco": "E15", "name": "Queen's Indian Defense: Fianchetto Variation, Check Variation, Modern Line" } } } }, "_metadata": { "eco": "E15", "name": "Queen's Indian Defense: Fianchetto Variation, Nimzowitsch Variation, Quiet Line" } }, "_metadata": { "eco": "E15", "name": "Queen's Indian Defense: Fianchetto Variation, Nimzowitsch Variation" }, "Qa4": { "_metadata": { "eco": "E15", "name": "Queen's Indian Defense: Fianchetto Variation, Nimzowitsch Variation, Nimzowitsch Attack" } }, "Qb3": { "_metadata": { "eco": "E15", "name": "Queen's Indian Defense: Fianchetto Variation, Nimzowitsch Variation, Timman's Line" } } } }, "_metadata": { "eco": "E12", "name": "Queen's Indian Defense" }, "a3": { "Bb7": { "Nc3": { "_metadata": { "eco": "E12", "name": "Queen's Indian Defense: Kasparov-Petrosian Variation" }, "Ne4": { "_metadata": { "eco": "E12", "name": "Queen's Indian Defense: Kasparov-Petrosian Variation, Andersson Variation" } }, "d5": { "cxd5": { "exd5": { "_metadata": { "eco": "E12", "name": "Queen's Indian Defense: Kasparov-Petrosian Variation, Classical Variation" } }, "Nxd5": { "Qc2": { "_metadata": { "eco": "E12", "name": "Queen's Indian Defense: Kasparov-Petrosian Variation, Kasparov Attack" } }, "_metadata": { "eco": "E12", "name": "Queen's Indian Defense: Kasparov-Petrosian Variation, Modern Variation" }, "e3": { "_metadata": { "eco": "E12", "name": "Queen's Indian Defense: Kasparov-Petrosian Variation, Petrosian Attack" } }, "Qa4+": { "_metadata": { "eco": "E12", "name": "Queen's Indian Defense: Kasparov-Petrosian Variation, Rashkovsky Attack" } }, "Bd2": { "_metadata": { "eco": "E12", "name": "Queen's Indian Defense: Kasparov-Petrosian Variation, Romanishin Attack" } } } }, "_metadata": { "eco": "E12", "name": "Queen's Indian Defense: Kasparov-Petrosian Variation, Main Line" } }, "g6": { "_metadata": { "eco": "E12", "name": "Queen's Indian Defense: Kasparov-Petrosian Variation, Hedgehog Variation" } }, "Be7": { "_metadata": { "eco": "E12", "name": "Queen's Indian Defense: Kasparov-Petrosian Variation, Marco Defense" } } } }, "_metadata": { "eco": "E12", "name": "Queen's Indian Defense: Petrosian Variation" }, "Ba6": { "Qc2": { "Bb7": { "_metadata": { "eco": "E12", "name": "Queen's Indian Defense: Petrosian Variation, Farago Defense" } } } } }, "Bf4": { "_metadata": { "eco": "E12", "name": "Queen's Indian Defense: Miles Variation" } }, "e3": { "Bb7": { "Bd3": { "c5": { "O-O": { "Be7": { "b3": { "O-O": { "Bb2": { "cxd4": { "Nxd4": { "_metadata": { "eco": "E14", "name": "Queen's Indian Defense: Averbakh Variation" } } } } } } } } } } }, "_metadata": { "eco": "E14", "name": "Queen's Indian Defense: Spassky System" } } }, "_metadata": { "eco": "E10", "name": "Indian Defense: Anti-Nimzo-Indian" }, "a6": { "_metadata": { "eco": "E10", "name": "Indian Defense: Dzindzi-Indian Defense" } }, "Ne4": { "_metadata": { "eco": "E10", "name": "Indian Defense: D\u00f6ry Indian" } }, "Bb4+": { "_metadata": { "eco": "E11", "name": "Bogo-Indian Defense" }, "Bd2": { "Bxd2+": { "_metadata": { "eco": "E11", "name": "Bogo-Indian Defense: Exchange Variation" } }, "Nc6": { "_metadata": { "eco": "E11", "name": "Bogo-Indian Defense: Haiti Variation" } }, "Qe7": { "_metadata": { "eco": "E11", "name": "Bogo-Indian Defense: Nimzowitsch Variation" } }, "Be7": { "_metadata": { "eco": "E11", "name": "Bogo-Indian Defense: Retreat Variation" } }, "c5": { "_metadata": { "eco": "E11", "name": "Bogo-Indian Defense: Vitolins Variation" } }, "a5": { "_metadata": { "eco": "E11", "name": "Bogo-Indian Defense: Wade-Smyslov Variation" }, "g3": { "b6": { "Bg2": { "Bb7": { "_metadata": { "eco": "E16", "name": "Queen's Indian Defense: Yates Variation" } } } } } } }, "Nbd2": { "_metadata": { "eco": "E11", "name": "Bogo-Indian Defense: Gr\u00fcnfeld Variation" } }, "Nfd2": { "_metadata": { "eco": "E11", "name": "Bogo-Indian Defense: New England Variation" } }, "Nc3": { "c5": { "d5": { "b5": { "_metadata": { "eco": "E21", "name": "Nimzo-Indian Defense: Three Knights Variation, Shocron Gambit" } } } } } } }, "g3": { "c5": { "d5": { "exd5": { "cxd5": { "d6": { "Nc3": { "g6": { "Bg2": { "Bg7": { "Nf3": { "O-O": { "_metadata": { "eco": "A62", "name": "Benoni Defense: Fianchetto Variation" }, "O-O": { "Nbd7": { "_metadata": { "eco": "A63", "name": "Benoni Defense: Fianchetto Variation, Hastings Defense" } }, "a6": { "a4": { "Nbd7": { "1Nd2": { "Re8": { "_metadata": { "eco": "A64", "name": "Benoni Defense: Fianchetto Variation, Hastings Defense, Main Line" } } } } } } } } } } } } } } } } } }, "_metadata": { "eco": "E00", "name": "Catalan Opening" }, "d5": { "_metadata": { "eco": "E00", "name": "Catalan Opening" }, "Bg2": { "_metadata": { "eco": "E01", "name": "Catalan Opening: Closed" }, "dxc4": { "_metadata": { "eco": "E02", "name": "Catalan Opening: Open Defense" }, "Qa4+": { "Nbd7": { "Qxc4": { "_metadata": { "eco": "E03", "name": "Catalan Opening: Open Defense" }, "a6": { "Qc2": { "_metadata": { "eco": "E03", "name": "Catalan Opening: Open Defense, Alekhine Variation" } } } } } }, "Nf3": { "_metadata": { "eco": "E04", "name": "Catalan Opening: Open Defense" }, "Nc6": { "Qa4": { "Bb4+": { "_metadata": { "eco": "E04", "name": "Catalan Opening: Open Defense, Modern Sharp Variation" } } } }, "Be7": { "_metadata": { "eco": "E05", "name": "Catalan Opening: Open Defense, Classical Line" } } } }, "Be7": { "Nf3": { "_metadata": { "eco": "E06", "name": "Catalan Opening: Closed" }, "O-O": { "O-O": { "c6": { "Qc2": { "b6": { "Nbd2": { "Bb7": { "e4": { "Na6": { "_metadata": { "eco": "E06", "name": "Catalan Opening: Closed" } } } } }, "Rd1": { "Nbd7": { "Bf4": { "_metadata": { "eco": "E08", "name": "Catalan Opening: Closed" } } } } } } }, "Nbd7": { "_metadata": { "eco": "E07", "name": "Catalan Opening: Closed" }, "Nc3": { "c6": { "Qd3": { "_metadata": { "eco": "E07", "name": "Catalan Opening: Closed, Botvinnik Variation" } } } }, "Qc2": { "_metadata": { "eco": "E08", "name": "Catalan Opening: Closed" }, "c6": { "b3": { "_metadata": { "eco": "E08", "name": "Catalan Opening: Closed" }, "b6": { "_metadata": { "eco": "E08", "name": "Catalan Opening: Closed" } } }, "Bf4": { "b6": { "Nbd2": { "Bb7": { "e4": { "_metadata": { "eco": "E08", "name": "Catalan Opening: Closed" } } } } } }, "Nbd2": { "b6": { "b3": { "a5": { "Bb2": { "Ba6": { "_metadata": { "eco": "E09", "name": "Catalan Opening: Closed, Sokolsky Variation" } } } } } } } } } } } } } } } }, "e5": { "_metadata": { "eco": "E00", "name": "Catalan Opening: Hungarian Gambit" } }, "Be7": { "Bg2": { "d5": { "Nf3": { "O-O": { "O-O": { "Nbd7": { "Qc2": { "c6": { "b3": { "b6": { "Rd1": { "Bb7": { "Nc3": { "b5": { "_metadata": { "eco": "E08", "name": "Catalan Opening: Closed, Spassky Gambit" } } } } } } } } } } } } } } } }, "Bb4+": { "Bd2": { "Be7": { "Bg2": { "d5": { "Nf3": { "_metadata": { "eco": "E11", "name": "Bogo-Indian Defense: Retreat Variation" }, "O-O": { "_metadata": { "eco": "E11", "name": "Bogo-Indian Defense: Retreat Variation" }, "O-O": { "_metadata": { "eco": "E11", "name": "Bogo-Indian Defense: Retreat Variation" } }, "Qc2": { "c6": { "O-O": { "_metadata": { "eco": "E11", "name": "Bogo-Indian Defense: Retreat Variation" } } } } }, "Nbd7": { "O-O": { "O-O": { "Qc2": { "c6": { "_metadata": { "eco": "E11", "name": "Bogo-Indian Defense: Retreat Variation" } } } } } } } } } } } } }, "Nc3": { "c5": { "Nf3": { "d5": { "cxd5": { "exd5": { "g3": { "Nc6": { "Bg2": { "Be7": { "O-O": { "O-O": { "Bg5": { "Be6": { "Rc1": { "c4": { "_metadata": { "eco": "D34", "name": "Tarrasch Defense: Classical Variation, Bogoljubow Variation" } } } } } } } } } } } } } } } }, "d5": { "cxd5": { "_metadata": { "eco": "D35", "name": "Queen's Gambit Declined: Exchange Variation" }, "exd5": { "Bg5": { "Be7": { "e3": { "O-O": { "Bd3": { "Nbd7": { "Qc2": { "Re8": { "Nge2": { "Nf8": { "O-O-O": { "_metadata": { "eco": "D35", "name": "Queen's Gambit Declined: Exchange Variation, Chameleon Variation" } } } } } } } } } } }, "_metadata": { "eco": "D35", "name": "Queen's Gambit Declined: Exchange Variation, Positional Variation" }, "c6": { "_metadata": { "eco": "D35", "name": "Queen's Gambit Declined: Exchange Variation, Positional Variation" }, "Qc2": { "_metadata": { "eco": "D36", "name": "Queen's Gambit Declined: Exchange Variation, Reshevsky Variation" } } } } } }, "Nf3": { "Be7": { "Bf4": { "O-O": { "e3": { "Nbd7": { "c5": { "_metadata": { "eco": "D37", "name": "Queen's Gambit Declined: Harrwitz Attack, Two Knights Defense, Blockade Line" } } } } } }, "Bg5": { "O-O": { "e3": { "Nbd7": { "Rc1": { "c6": { "a3": { "a6": { "Qc2": { "_metadata": { "eco": "D64", "name": "Queen's Gambit Declined: Orthodox Defense, Rubinstein Attack" } } } } } } } } } } } }, "Bg5": { "Be7": { "e3": { "Ne4": { "_metadata": { "eco": "D53", "name": "Queen's Gambit Declined: Lasker Defense" } }, "O-O": { "Rc1": { "_metadata": { "eco": "D54", "name": "Queen's Gambit Declined: Neo-Orthodox Variation" } }, "Nf3": { "Nbd7": { "Rc1": { "b6": { "cxd5": { "exd5": { "Bd3": { "_metadata": { "eco": "D63", "name": "Queen's Gambit Declined: Orthodox Defense, Pillsbury Variation" } } } } } } } } }, "h6": { "Bh4": { "O-O": { "Nf3": { "Ne4": { "Bxe7": { "Qxe7": { "cxd5": { "Nxc3": { "bxc3": { "exd5": { "1Qb3": { "Qd6": { "_metadata": { "eco": "D57", "name": "Queen's Gambit Declined: Lasker Defense, Bernstein Variation" } } } } } } } } } } } } } } } } } }, "Bb4": { "_metadata": { "eco": "E20", "name": "Nimzo-Indian Defense" }, "e4": { "_metadata": { "eco": "E20", "name": "Nimzo-Indian Defense: Dilworth Gambit" } }, "f3": { "_metadata": { "eco": "E20", "name": "Nimzo-Indian Defense: Kmoch Variation" }, "d5": { "a3": { "Bxc3+": { "bxc3": { "c5": { "e3": { "O-O": { "cxd5": { "Nxd5": { "_metadata": { "eco": "E24", "name": "Nimzo-Indian Defense: S\u00e4misch Variation, Botvinnik Variation" } } } } }, "cxd5": { "_metadata": { "eco": "E25", "name": "Nimzo-Indian Defense: S\u00e4misch Variation" }, "Nxd5": { "dxc5": { "_metadata": { "eco": "E25", "name": "Nimzo-Indian Defense: S\u00e4misch Variation, Keres Variation" }, "f5": { "_metadata": { "eco": "E25", "name": "Nimzo-Indian Defense: S\u00e4misch Variation, Romanovsky Variation" } } } } } } } } } } }, "Qd3": { "_metadata": { "eco": "E20", "name": "Nimzo-Indian Defense: Mikenas Attack" } }, "g3": { "_metadata": { "eco": "E20", "name": "Nimzo-Indian Defense: Romanishin Variation" } }, "Nf3": { "c5": { "g3": { "O-O": { "Bg2": { "_metadata": { "eco": "E20", "name": "Nimzo-Indian Defense: Romanishin Variation" } } }, "cxd4": { "Nxd4": { "O-O": { "Bg2": { "d5": { "cxd5": { "Nxd5": { "_metadata": { "eco": "E20", "name": "Nimzo-Indian Defense: Romanishin Variation, English Hybrid" } } } } } } } } }, "d5": { "Ne4": { "_metadata": { "eco": "E21", "name": "Nimzo-Indian Defense: Three Knights Variation, Euwe Variation" } }, "_metadata": { "eco": "E21", "name": "Nimzo-Indian Defense: Three Knights Variation, Korchnoi Variation" } } }, "_metadata": { "eco": "E21", "name": "Nimzo-Indian Defense: Three Knights Variation" }, "Bxc3+": { "bxc3": { "b6": { "e3": { "Bb7": { "Bd3": { "O-O": { "O-O": { "_metadata": { "eco": "E43", "name": "Nimzo-Indian Defense: St. Petersburg Variation" } } } } } } } } }, "b6": { "e3": { "Ne4": { "Qc2": { "_metadata": { "eco": "E43", "name": "Nimzo-Indian Defense: St. Petersburg Variation" }, "Bb7": { "Bd3": { "Bxc3+": { "bxc3": { "f5": { "O-O": { "_metadata": { "eco": "E43", "name": "Nimzo-Indian Defense: St. Petersburg Variation" } } } } } } } } } } } }, "Qb3": { "_metadata": { "eco": "E22", "name": "Nimzo-Indian Defense: Spielmann Variation" }, "c5": { "dxc5": { "Nc6": { "Nf3": { "Ne4": { "Bd2": { "Nxd2": { "_metadata": { "eco": "E23", "name": "Nimzo-Indian Defense: Spielmann Variation, Carlsbad Variation" } }, "Nxc5": { "_metadata": { "eco": "E23", "name": "Nimzo-Indian Defense: Spielmann Variation, Stahlberg Variation" }, "Qc2": { "f5": { "g3": { "_metadata": { "eco": "E23", "name": "Nimzo-Indian Defense: Spielmann Variation, Stahlberg Variation" } } } } } } } }, "_metadata": { "eco": "E23", "name": "Nimzo-Indian Defense: Spielmann Variation, Romanovsky Gambit" } } } } }, "a3": { "_metadata": { "eco": "E24", "name": "Nimzo-Indian Defense: S\u00e4misch Variation" }, "Bxc3+": { "bxc3": { "c5": { "e3": { "_metadata": { "eco": "E26", "name": "Nimzo-Indian Defense: S\u00e4misch Variation" }, "b6": { "_metadata": { "eco": "E26", "name": "Nimzo-Indian Defense: S\u00e4misch Variation, O'Kelly Variation" } } } }, "O-O": { "_metadata": { "eco": "E27", "name": "Nimzo-Indian Defense: S\u00e4misch Variation" } } } } }, "e3": { "O-O": { "a3": { "Bxc3+": { "bxc3": { "_metadata": { "eco": "E28", "name": "Nimzo-Indian Defense: S\u00e4misch Variation" } } } }, "Bd3": { "c5": { "Nf3": { "b6": { "O-O": { "Bb7": { "Na4": { "Qe7": { "_metadata": { "eco": "E43", "name": "Nimzo-Indian Defense: St. Petersburg Variation" } } } } } } } }, "_metadata": { "eco": "E47", "name": "Nimzo-Indian Defense: Normal Variation" }, "d5": { "_metadata": { "eco": "E48", "name": "Nimzo-Indian Defense: Normal Variation, Classical Defense" }, "Nf3": { "Nc6": { "O-O": { "_metadata": { "eco": "E48", "name": "Nimzo-Indian Defense: Ragozin Defense" }, "dxc4": { "_metadata": { "eco": "E51", "name": "Nimzo-Indian Defense: Ragozin Variation" } } } }, "b6": { "_metadata": { "eco": "E52", "name": "Nimzo-Indian Defense: Normal Variation, Schlechter Defense" } }, "c5": { "_metadata": { "eco": "E53", "name": "Nimzo-Indian Defense: Normal Variation, Gligoric System" }, "O-O": { "Nbd7": { "_metadata": { "eco": "E53", "name": "Nimzo-Indian Defense: Normal Variation, Gligoric System" } }, "b6": { "_metadata": { "eco": "E53", "name": "Nimzo-Indian Defense: Normal Variation, Gligoric System, Keres Variation" } }, "dxc4": { "Bxc4": { "_metadata": { "eco": "E54", "name": "Nimzo-Indian Defense: Normal Variation, Gligoric System, Exchange Variation" }, "Qe7": { "_metadata": { "eco": "E54", "name": "Nimzo-Indian Defense: Normal Variation, Gligoric System, Smyslov Variation" } }, "Nbd7": { "_metadata": { "eco": "E55", "name": "Nimzo-Indian Defense: Normal Variation, Gligoric System, Bronstein Variation" } } } }, "Nc6": { "_metadata": { "eco": "E56", "name": "Nimzo-Indian Defense: Normal Variation, Gligoric System, Bernstein Defense" }, "a3": { "Bxc3": { "bxc3": { "_metadata": { "eco": "E58", "name": "Nimzo-Indian Defense: Normal Variation, Bernstein Defense, Exchange Line" }, "dxc4": { "Bxc4": { "_metadata": { "eco": "E59", "name": "Nimzo-Indian Defense: Normal Variation, Bernstein Defense" } } } } } } } } } }, "a3": { "Bxc3+": { "bxc3": { "_metadata": { "eco": "E49", "name": "Nimzo-Indian Defense: Normal Variation, Botvinnik System" } } } } } }, "_metadata": { "eco": "E46", "name": "Nimzo-Indian Defense: Normal Variation" }, "Ne2": { "_metadata": { "eco": "E46", "name": "Nimzo-Indian Defense: Reshevsky Variation" }, "d5": { "a3": { "Bd6": { "_metadata": { "eco": "E46", "name": "Nimzo-Indian Defense: Simagin Variation" } } } } }, "Nf3": { "_metadata": { "eco": "E50", "name": "Nimzo-Indian Defense" }, "d5": { "_metadata": { "eco": "E51", "name": "Nimzo-Indian Defense: Normal Variation, Ragozin Variation" }, "a3": { "_metadata": { "eco": "E51", "name": "Nimzo-Indian Defense: Normal Variation, S\u00e4misch Deferred" } } } } }, "c5": { "Bd3": { "Nc6": { "a3": { "Bxc3+": { "bxc3": { "O-O": { "_metadata": { "eco": "E29", "name": "Nimzo-Indian Defense: S\u00e4misch Variation" }, "Ne2": { "b6": { "e4": { "Ne8": { "_metadata": { "eco": "E29", "name": "Nimzo-Indian Defense: S\u00e4misch Variation, Capablanca Variation" } } } } } } } } }, "Nf3": { "Bxc3+": { "bxc3": { "d6": { "_metadata": { "eco": "E41", "name": "Nimzo-Indian Defense: Rubinstein System, H\u00fcbner Variation" }, "O-O": { "O-O": { "_metadata": { "eco": "E41", "name": "Nimzo-Indian Defense: Rubinstein System, H\u00fcbner Variation" } } } } } } } } }, "_metadata": { "eco": "E41", "name": "Nimzo-Indian Defense: Rubinstein System" }, "Ne2": { "_metadata": { "eco": "E42", "name": "Nimzo-Indian Defense: Rubinstein System, Rubinstein Variation" }, "cxd4": { "exd4": { "O-O": { "a3": { "_metadata": { "eco": "E42", "name": "Nimzo-Indian Defense: Rubinstein System, Rubinstein Variation, Main Line" } }, "c5": { "_metadata": { "eco": "E42", "name": "Nimzo-Indian Defense: Rubinstein System, Rubinstein Variation, Sherbakov Attack" } } } } } } }, "_metadata": { "eco": "E40", "name": "Nimzo-Indian Defense: Rubinstein System" }, "Nc6": { "_metadata": { "eco": "E40", "name": "Nimzo-Indian Defense: Rubinstein System, Taimanov Variation" } }, "b6": { "_metadata": { "eco": "E43", "name": "Nimzo-Indian Defense: St. Petersburg Variation" }, "Bd3": { "Bb7": { "Nf3": { "_metadata": { "eco": "E43", "name": "Nimzo-Indian Defense: St. Petersburg Variation" }, "O-O": { "_metadata": { "eco": "E43", "name": "Nimzo-Indian Defense: St. Petersburg Variation" }, "O-O": { "_metadata": { "eco": "E43", "name": "Nimzo-Indian Defense: St. Petersburg Variation" }, "c5": { "_metadata": { "eco": "E43", "name": "Nimzo-Indian Defense: St. Petersburg Variation" }, "Na4": { "cxd4": { "a3": { "Be7": { "_metadata": { "eco": "E43", "name": "Nimzo-Indian Defense: St. Petersburg Variation" } } } } } }, "d5": { "_metadata": { "eco": "E52", "name": "Nimzo-Indian Defense: Normal Variation, Schlechter Defense" } } } }, "Ne4": { "_metadata": { "eco": "E43", "name": "Nimzo-Indian Defense: St. Petersburg Variation, with Ne4" } } } } }, "Ne2": { "_metadata": { "eco": "E44", "name": "Nimzo-Indian Defense: St. Petersburg Variation" }, "Ne4": { "_metadata": { "eco": "E44", "name": "Nimzo-Indian Defense: St. Petersburg Variation, American Variation" } }, "c5": { "a3": { "Ba5": { "_metadata": { "eco": "E44", "name": "Nimzo-Indian Defense: St. Petersburg Variation, Romanishin-Psakhis Variation" } } } }, "Ba6": { "_metadata": { "eco": "E45", "name": "Nimzo-Indian Defense: St. Petersburg Variation, Fischer Variation" } } } }, "Ne4": { "Qc2": { "f5": { "Nf3": { "b6": { "Bd3": { "Bb7": { "_metadata": { "eco": "E43", "name": "Nimzo-Indian Defense: St. Petersburg Variation" } } } } } } } } }, "Bg5": { "_metadata": { "eco": "E30", "name": "Nimzo-Indian Defense: Leningrad Variation" }, "h6": { "Bh4": { "c5": { "d5": { "b5": { "_metadata": { "eco": "E30", "name": "Nimzo-Indian Defense: Leningrad Variation, Averbakh Gambit" } }, "d6": { "_metadata": { "eco": "E31", "name": "Nimzo-Indian Defense: Leningrad Variation, Benoni Defense" } } } } } } }, "Qc2": { "_metadata": { "eco": "E32", "name": "Nimzo-Indian Defense: Classical Variation" }, "O-O": { "a3": { "Bxc3+": { "Qxc3": { "b6": { "_metadata": { "eco": "E32", "name": "Nimzo-Indian Defense: Classical Variation, Keres Defense" } }, "b5": { "_metadata": { "eco": "E32", "name": "Nimzo-Indian Defense: Classical Variation, Vitolins-Adorjan Gambit" } } } } } }, "Nc6": { "Nf3": { "d6": { "_metadata": { "eco": "E33", "name": "Nimzo-Indian Defense: Classical Variation, Milner-Barry Variation" } } }, "_metadata": { "eco": "E33", "name": "Nimzo-Indian Defense: Classical Variation, Zurich Variation" } }, "d5": { "cxd5": { "Qxd5": { "Nf3": { "Qf5": { "Qd1": { "e5": { "_metadata": { "eco": "E34", "name": "Nimzo-Indian Defense: Classical Variation, Belyavsky Gambit" } } } } } }, "exd5": { "_metadata": { "eco": "E35", "name": "Nimzo-Indian Defense: Classical Variation, Noa Variation" } } }, "_metadata": { "eco": "E34", "name": "Nimzo-Indian Defense: Classical Variation, Noa Variation" }, "a3": { "_metadata": { "eco": "E36", "name": "Nimzo-Indian Defense: Classical Variation, Noa Variation" }, "Bxc3+": { "Qxc3": { "Nc6": { "_metadata": { "eco": "E36", "name": "Nimzo-Indian Defense: Classical Variation, Noa Variation, Botvinnik Variation" } }, "Ne4": { "_metadata": { "eco": "E36", "name": "Nimzo-Indian Defense: Classical Variation, Noa Variation, Main Line" }, "Qc2": { "_metadata": { "eco": "E37", "name": "Nimzo-Indian Defense: Classical Variation, Noa Variation" }, "Nc6": { "e3": { "e5": { "_metadata": { "eco": "E37", "name": "Nimzo-Indian Defense: Classical Variation, Noa Variation, San Remo Variation" } } } } } } } } } }, "c5": { "_metadata": { "eco": "E38", "name": "Nimzo-Indian Defense: Classical Variation, Berlin Variation" }, "dxc5": { "Bxc3+": { "_metadata": { "eco": "E38", "name": "Nimzo-Indian Defense: Classical Variation, Berlin Variation, Steiner Variation" } }, "O-O": { "a3": { "Bxc5": { "Nf3": { "b6": { "Bf4": { "_metadata": { "eco": "E39", "name": "Nimzo-Indian Defense: Classical Variation, Berlin Variation, Macieja System" } } } } } }, "_metadata": { "eco": "E39", "name": "Nimzo-Indian Defense: Classical Variation, Berlin Variation, Pirc Variation" } } } } } } }, "Qb3": { "_metadata": { "eco": "E00", "name": "Indian Defense" } }, "g4": { "_metadata": { "eco": "E00", "name": "Indian Defense: Devin Gambit" } }, "Bg5": { "_metadata": { "eco": "E00", "name": "Indian Defense: Seirawan Attack" } } }, "g6": { "Nc3": { "Bg7": { "e4": { "d6": { "f4": { "O-O": { "Nf3": { "c5": { "d5": { "e6": { "Be2": { "exd5": { "cxd5": { "Re8": { "_metadata": { "eco": "A69", "name": "Benoni Defense: Four Pawns Attack, Main Line" } } }, "e5": { "_metadata": { "eco": "E77", "name": "King's Indian Defense: Four Pawns Attack, Florentine Gambit" } } }, "_metadata": { "eco": "E77", "name": "King's Indian Defense: Four Pawns Attack, Normal Attack" } } }, "_metadata": { "eco": "E76", "name": "King's Indian Defense: Four Pawns Attack, Dynamic Attack" } }, "Be2": { "_metadata": { "eco": "E78", "name": "King's Indian Defense: Four Pawns Attack, Fluid Attack" }, "cxd4": { "Nxd4": { "Nc6": { "Be3": { "_metadata": { "eco": "E79", "name": "King's Indian Defense: Four Pawns Attack, Exchange Variation" } } } } } } } }, "Be2": { "c5": { "d5": { "e6": { "dxe6": { "fxe6": { "g4": { "Nc6": { "h4": { "_metadata": { "eco": "E77", "name": "King's Indian Defense: Six Pawns Attack" } } } } } } } } } } }, "_metadata": { "eco": "E76", "name": "King's Indian Defense: Four Pawns Attack" }, "Na6": { "_metadata": { "eco": "E76", "name": "King's Indian Defense: Four Pawns Attack, Modern Defense" } } }, "Bg5": { "_metadata": { "eco": "E70", "name": "King's Indian Defense: Accelerated Averbakh Variation" } }, "Nge2": { "_metadata": { "eco": "E70", "name": "King's Indian Defense: Kramer Variation" } }, "_metadata": { "eco": "E70", "name": "King's Indian Defense: Normal Variation" }, "h3": { "_metadata": { "eco": "E71", "name": "King's Indian Defense: Makogonov Variation" } }, "g3": { "_metadata": { "eco": "E72", "name": "King's Indian Defense: Normal Variation, Deferred Fianchetto" }, "O-O": { "Bg2": { "e5": { "Nge2": { "_metadata": { "eco": "E72", "name": "King's Indian Defense: Pomar System" } } } } } }, "Be2": { "O-O": { "Bg5": { "_metadata": { "eco": "E73", "name": "King's Indian Defense: Averbakh Variation" }, "h6": { "_metadata": { "eco": "E73", "name": "King's Indian Defense: Averbakh Variation, Flexible Defense" } }, "Nbd7": { "_metadata": { "eco": "E73", "name": "King's Indian Defense: Averbakh Variation, Geller Defense" } }, "Na6": { "_metadata": { "eco": "E73", "name": "King's Indian Defense: Averbakh Variation, Modern Defense" }, "Qd2": { "c6": { "_metadata": { "eco": "E73", "name": "King's Indian Defense: Averbakh Variation, Modern Defense, Burgess Line" } } } }, "Nc6": { "_metadata": { "eco": "E73", "name": "King's Indian Defense: Averbakh Variation, Nc6 Defense" } }, "a6": { "_metadata": { "eco": "E73", "name": "King's Indian Defense: Averbakh Variation, Spanish Defense" } }, "c5": { "_metadata": { "eco": "E74", "name": "King's Indian Defense: Averbakh Variation, Benoni Defense" }, "d5": { "_metadata": { "eco": "E74", "name": "King's Indian Defense: Averbakh Variation, Benoni Defense, Advance Variation" }, "e6": { "_metadata": { "eco": "E75", "name": "King's Indian Defense: Averbakh Variation, Main Line" } } }, "dxc5": { "_metadata": { "eco": "E74", "name": "King's Indian Defense: Averbakh Variation, Benoni Defense, Exchange Variation" } } } }, "Be3": { "_metadata": { "eco": "E73", "name": "King's Indian Defense: Semi-Averbakh System" } }, "f4": { "_metadata": { "eco": "E77", "name": "King's Indian Defense: Four Pawns Attack" } } }, "_metadata": { "eco": "E73", "name": "King's Indian Defense: Normal Variation, Standard Development" } }, "f3": { "_metadata": { "eco": "E80", "name": "King's Indian Defense: S\u00e4misch Variation" }, "O-O": { "Bg5": { "_metadata": { "eco": "E81", "name": "King's Indian Defense: Steiner Attack" } }, "Nge2": { "_metadata": { "eco": "E81", "name": "King's Indian Defense: S\u00e4misch Variation, Bobotsov-Korchnoi-Petrosian Variation" } }, "Be3": { "c6": { "Bd3": { "a6": { "_metadata": { "eco": "E81", "name": "King's Indian Defense: S\u00e4misch Variation, Byrne Defense" } } } }, "c5": { "_metadata": { "eco": "E81", "name": "King's Indian Defense: S\u00e4misch Variation, S\u00e4misch Gambit" } }, "b6": { "_metadata": { "eco": "E82", "name": "King's Indian Defense: S\u00e4misch Variation, Double Fianchetto" } }, "Nc6": { "Nge2": { "a6": { "_metadata": { "eco": "E83", "name": "King's Indian Defense: S\u00e4misch Variation, Panno Formation" }, "Qd2": { "Rb8": { "_metadata": { "eco": "E84", "name": "King's Indian Defense: S\u00e4misch Variation, Panno Main Line" } } } }, "Rb8": { "_metadata": { "eco": "E83", "name": "King's Indian Defense: S\u00e4misch Variation, Ruban Variation" } } }, "_metadata": { "eco": "E83", "name": "King's Indian Defense: S\u00e4misch Variation, Yates Defense" } }, "e5": { "_metadata": { "eco": "E85", "name": "King's Indian Defense: S\u00e4misch Variation, Orthodox Variation" }, "Nge2": { "c6": { "_metadata": { "eco": "E86", "name": "King's Indian Defense: S\u00e4misch Variation" }, "d5": { "cxd5": { "_metadata": { "eco": "E89", "name": "King's Indian Defense: S\u00e4misch Variation, Closed Variation, Main Line" } } } } }, "d5": { "Nh5": { "Qd2": { "Qh4+": { "g3": { "Nxg3": { "Qf2": { "Nxf1": { "1Qxh4": { "Nxe3": { "1Ke2": { "_metadata": { "eco": "E87", "name": "King's Indian Defense: S\u00e4misch Variation, Bronstein Defense" }, "Nxc4": { "_metadata": { "eco": "E87", "name": "King's Indian Defense: S\u00e4misch Variation, Orthodox Variation, Bronstein Variation" } } } } } } } } } } } }, "_metadata": { "eco": "E87", "name": "King's Indian Defense: S\u00e4misch Variation, Closed Variation" } } } }, "_metadata": { "eco": "E81", "name": "King's Indian Defense: S\u00e4misch Variation, Normal Defense" } } }, "Nf3": { "O-O": { "Be3": { "_metadata": { "eco": "E90", "name": "King's Indian Defense: Larsen Variation" } }, "Bg5": { "_metadata": { "eco": "E90", "name": "King's Indian Defense: Zinnowitz Variation" } }, "Be2": { "Na6": { "_metadata": { "eco": "E91", "name": "King's Indian Defense: Kazakh Variation" } }, "_metadata": { "eco": "E91", "name": "King's Indian Defense: Orthodox Variation" }, "e5": { "dxe5": { "_metadata": { "eco": "E92", "name": "King's Indian Defense: Exchange Variation" } }, "_metadata": { "eco": "E92", "name": "King's Indian Defense: Orthodox Variation" }, "Be3": { "_metadata": { "eco": "E92", "name": "King's Indian Defense: Orthodox Variation, Gligoric-Taimanov System" } }, "d5": { "_metadata": { "eco": "E92", "name": "King's Indian Defense: Petrosian Variation" }, "a5": { "_metadata": { "eco": "E92", "name": "King's Indian Defense: Petrosian Variation, Stein Defense" } }, "Nbd7": { "Bg5": { "h6": { "Bh4": { "g5": { "Bg3": { "Nh5": { "1h4": { "_metadata": { "eco": "E93", "name": "King's Indian Defense: Petrosian Variation, Keres Defense" } } } } } } } }, "_metadata": { "eco": "E93", "name": "King's Indian Defense: Petrosian Variation, Normal Defense" } } }, "O-O": { "_metadata": { "eco": "E94", "name": "King's Indian Defense: Orthodox Variation" }, "c6": { "_metadata": { "eco": "E94", "name": "King's Indian Defense: Orthodox Variation, Donner Defense" } }, "Na6": { "_metadata": { "eco": "E94", "name": "King's Indian Defense: Orthodox Variation, Glek Defense" } }, "a5": { "_metadata": { "eco": "E94", "name": "King's Indian Defense: Orthodox Variation, Ukrainian Defense" } }, "Nbd7": { "Re1": { "_metadata": { "eco": "E95", "name": "King's Indian Defense: Orthodox Variation" }, "c6": { "Bf1": { "a5": { "_metadata": { "eco": "E96", "name": "King's Indian Defense: Orthodox Variation, Positional Defense, Main Line" } } } } } }, "Nc6": { "_metadata": { "eco": "E97", "name": "King's Indian Defense: Orthodox Variation, Aronin-Taimanov Defense" }, "d5": { "Ne7": { "b4": { "_metadata": { "eco": "E97", "name": "King's Indian Defense: Orthodox Variation, Bayonet Attack" }, "Nh5": { "Re1": { "_metadata": { "eco": "E97", "name": "King's Indian Defense: Orthodox Variation, Bayonet Attack, Sokolov's Line" } }, "Qc2": { "_metadata": { "eco": "E97", "name": "King's Indian Defense: Orthodox Variation, Bayonet Attack, Yepishin's Line" } } } }, "Bd2": { "_metadata": { "eco": "E97", "name": "King's Indian Defense: Orthodox Variation, Korchnoi Attack" } }, "Nd2": { "_metadata": { "eco": "E97", "name": "King's Indian Defense: Orthodox Variation, Modern System" } }, "Ne1": { "_metadata": { "eco": "E98", "name": "King's Indian Defense: Orthodox Variation, Classical System" }, "Nd7": { "Be3": { "f5": { "1f3": { "f4": { "1Bf2": { "g5": { "1Rc1": { "Ng6": { "1c5": { "_metadata": { "eco": "E98", "name": "King's Indian Defense: Orthodox Variation, Classical System, Kozul Gambit" } } } } } } } } }, "_metadata": { "eco": "E98", "name": "King's Indian Defense: Orthodox Variation, Classical System, Neo-Classical Line" } }, "f3": { "f5": { "1g4": { "_metadata": { "eco": "E99", "name": "King's Indian Defense: Orthodox Variation, Classical System, Benko Attack" } }, "_metadata": { "eco": "E99", "name": "King's Indian Defense: Orthodox Variation, Classical System, Traditional Line" } } } } } } } } } }, "Nbd7": { "O-O": { "e5": { "d5": { "_metadata": { "eco": "E94", "name": "King's Indian Defense: Orthodox Variation, Positional Defense, Closed Line" } } } } } } }, "_metadata": { "eco": "E90", "name": "King's Indian Defense: Normal Variation, Rare Defenses" } } }, "_metadata": { "eco": "E70", "name": "King's Indian Defense: Normal Variation" } }, "Nf3": { "O-O": { "g3": { "d5": { "cxd5": { "Nxd5": { "Bg2": { "c5": { "O-O": { "_metadata": { "eco": "D75", "name": "Neo-Gr\u00fcnfeld Defense: Delayed Exchange Variation" } } } } } } } }, "e3": { "d6": { "Be2": { "c6": { "_metadata": { "eco": "E60", "name": "King's Indian Defense: Semi-Classical Variation, Benoni Variation" } }, "_metadata": { "eco": "E61", "name": "King's Indian Defense: Semi-Classical Variation" }, "Nbd7": { "O-O": { "e5": { "dxe5": { "dxe5": { "_metadata": { "eco": "E61", "name": "King's Indian Defense: Semi-Classical Variation, Exchange Variation" } } }, "b4": { "_metadata": { "eco": "E61", "name": "King's Indian Defense: Semi-Classical Variation, Queenside Storm Line" } } } } } } } } }, "d6": { "g3": { "O-O": { "Bg2": { "c6": { "O-O": { "Qb6": { "_metadata": { "eco": "E61", "name": "King's Indian Defense: Fianchetto Variation, Benjamin Defense" } }, "Bf5": { "_metadata": { "eco": "E62", "name": "King's Indian Defense: Fianchetto Variation, Larsen Defense" } } } }, "Nc6": { "O-O": { "Bg4": { "_metadata": { "eco": "E62", "name": "King's Indian Defense: Fianchetto Variation, Simagin Variation" } } } }, "Nbd7": { "O-O": { "e5": { "e4": { "Re8": { "h3": { "exd4": { "Nxd4": { "Nc5": { "1Re1": { "a5": { "_metadata": { "eco": "E68", "name": "King's Indian Defense: Fianchetto Variation, Long Variation" } } } } } } } } } } } } } }, "_metadata": { "eco": "E62", "name": "King's Indian Defense: Fianchetto Variation, Delayed Fianchetto" } }, "Bg5": { "_metadata": { "eco": "E61", "name": "King's Indian Defense: Smyslov Variation" } } } } }, "d5": { "_metadata": { "eco": "D80", "name": "Gr\u00fcnfeld Defense" }, "g4": { "_metadata": { "eco": "D80", "name": "Gr\u00fcnfeld Defense: Gibbon Gambit" } }, "Bg5": { "Ne4": { "Nxe4": { "dxe4": { "Qd2": { "c5": { "_metadata": { "eco": "D80", "name": "Gr\u00fcnfeld Defense: Lundin Variation" } } } } } }, "_metadata": { "eco": "D80", "name": "Gr\u00fcnfeld Defense: Stockholm Variation" } }, "f3": { "_metadata": { "eco": "D80", "name": "Gr\u00fcnfeld Defense: Lutikov Variation" }, "c5": { "cxd5": { "Nxd5": { "Na4": { "_metadata": { "eco": "D80", "name": "Gr\u00fcnfeld Defense: Lutikov Variation, Murrey Attack" } } } } } }, "h4": { "_metadata": { "eco": "D80", "name": "Gr\u00fcnfeld Defense: Zaitsev Gambit" } }, "Qb3": { "_metadata": { "eco": "D81", "name": "Gr\u00fcnfeld Defense: Russian Variation, Accelerated Variation" } }, "Bf4": { "_metadata": { "eco": "D82", "name": "Gr\u00fcnfeld Defense: Brinckmann Attack" }, "Bg7": { "e3": { "O-O": { "_metadata": { "eco": "D83", "name": "Gr\u00fcnfeld Defense: Brinckmann Attack, Gr\u00fcnfeld Gambit" }, "Rc1": { "c5": { "dxc5": { "Be6": { "_metadata": { "eco": "D83", "name": "Gr\u00fcnfeld Defense: Brinckmann Attack, Gr\u00fcnfeld Gambit, Botvinnik Variation" } } } }, "_metadata": { "eco": "D83", "name": "Gr\u00fcnfeld Defense: Brinckmann Attack, Gr\u00fcnfeld Gambit, Capablanca Variation" } }, "cxd5": { "Nxd5": { "Nxd5": { "Qxd5": { "Bxc7": { "_metadata": { "eco": "D84", "name": "Gr\u00fcnfeld Defense: Brinckmann Attack, Gr\u00fcnfeld Gambit Accepted" } } } } } } } }, "Rc1": { "O-O": { "e3": { "c5": { "dxc5": { "Qa5": { "_metadata": { "eco": "D83", "name": "Gr\u00fcnfeld Defense: Brinckmann Attack, Reshevsky Gambit" } } } } } } } } }, "cxd5": { "Nxd5": { "_metadata": { "eco": "D85", "name": "Gr\u00fcnfeld Defense: Exchange Variation" }, "e4": { "Nxc3": { "bxc3": { "Bg7": { "Nf3": { "_metadata": { "eco": "D85", "name": "Gr\u00fcnfeld Defense: Exchange Variation, Modern Exchange Variation" }, "c5": { "_metadata": { "eco": "D85", "name": "Gr\u00fcnfeld Defense: Exchange Variation, Modern Exchange Variation" }, "Rb1": { "O-O": { "Be2": { "Nc6": { "d5": { "Bxc3+": { "_metadata": { "eco": "D85", "name": "Gr\u00fcnfeld Defense: Exchange Variation, Modern Exchange Variation, Pawn Grab Line" } } } } } } } } }, "Bc4": { "_metadata": { "eco": "D86", "name": "Gr\u00fcnfeld Defense: Exchange Variation, Classical Variation" }, "O-O": { "Ne2": { "Qd7": { "_metadata": { "eco": "D86", "name": "Gr\u00fcnfeld Defense: Exchange Variation, Larsen Variation" }, "O-O": { "b6": { "_metadata": { "eco": "D86", "name": "Gr\u00fcnfeld Defense: Exchange Variation, Larsen Variation" } } } }, "Nc6": { "_metadata": { "eco": "D86", "name": "Gr\u00fcnfeld Defense: Exchange Variation, Simagin's Improved Variation" } }, "b6": { "_metadata": { "eco": "D86", "name": "Gr\u00fcnfeld Defense: Exchange Variation, Simagin's Lesser Variation" } } } }, "c5": { "Ne2": { "Nc6": { "Be3": { "O-O": { "O-O": { "Bg4": { "1f3": { "Na5": { "1Bxf7+": { "_metadata": { "eco": "D87", "name": "Gr\u00fcnfeld Defense: Exchange Variation, Seville Variation" } }, "1Bd3": { "cxd4": { "1cxd4": { "Be6": { "_metadata": { "eco": "D89", "name": "Gr\u00fcnfeld Defense: Exchange Variation, Spassky Variation" } } } } } } } }, "cxd4": { "1cxd4": { "_metadata": { "eco": "D88", "name": "Gr\u00fcnfeld Defense: Exchange Variation, Spassky Variation" } } } } } } }, "O-O": { "_metadata": { "eco": "D87", "name": "Gr\u00fcnfeld Defense: Exchange Variation, Spassky Variation" }, "O-O": { "Nc6": { "Be3": { "Bg4": { "1f3": { "Na5": { "1Bd3": { "cxd4": { "1cxd4": { "Be6": { "1d5": { "_metadata": { "eco": "D89", "name": "Gr\u00fcnfeld Defense: Exchange Variation, Sokolsky Variation" } } } } } } } } } } } } } } } } } } } }, "Na4": { "_metadata": { "eco": "D85", "name": "Gr\u00fcnfeld Defense: Exchange Variation, Nadanian Attack" } } } }, "Nf3": { "Bg7": { "Qa4+": { "_metadata": { "eco": "D90", "name": "Gr\u00fcnfeld Defense: Flohr Variation" } }, "_metadata": { "eco": "D90", "name": "Gr\u00fcnfeld Defense: Three Knights Variation" }, "Bg5": { "_metadata": { "eco": "D91", "name": "Gr\u00fcnfeld Defense: Three Knights Variation, Petrosian System" } }, "Bf4": { "_metadata": { "eco": "D92", "name": "Gr\u00fcnfeld Defense: Three Knights Variation, Hungarian Attack" }, "O-O": { "e3": { "_metadata": { "eco": "D93", "name": "Gr\u00fcnfeld Defense: Three Knights Variation, Hungarian Variation" } } } }, "e3": { "O-O": { "b4": { "_metadata": { "eco": "D94", "name": "Gr\u00fcnfeld Defense: Makogonov Variation" } }, "Bd2": { "_metadata": { "eco": "D94", "name": "Gr\u00fcnfeld Defense: Opocensky Variation" } }, "Bd3": { "_metadata": { "eco": "D94", "name": "Gr\u00fcnfeld Defense: Three Knights Variation, Paris Variation" } }, "Qb3": { "e6": { "_metadata": { "eco": "D95", "name": "Gr\u00fcnfeld Defense: Botvinnik Variation" } }, "_metadata": { "eco": "D95", "name": "Gr\u00fcnfeld Defense: Three Knights Variation, Vienna Variation" } } }, "_metadata": { "eco": "D94", "name": "Gr\u00fcnfeld Defense: Three Knights Variation, Burille Variation" } }, "Qb3": { "_metadata": { "eco": "D96", "name": "Gr\u00fcnfeld Defense: Russian Variation" }, "dxc4": { "Qxc4": { "O-O": { "e4": { "_metadata": { "eco": "D97", "name": "Gr\u00fcnfeld Defense: Russian Variation" }, "Nc6": { "_metadata": { "eco": "D97", "name": "Gr\u00fcnfeld Defense: Russian Variation, Byrne Variation" } }, "a6": { "_metadata": { "eco": "D97", "name": "Gr\u00fcnfeld Defense: Russian Variation, Hungarian Variation" } }, "b6": { "_metadata": { "eco": "D97", "name": "Gr\u00fcnfeld Defense: Russian Variation, Levenfish Variation" } }, "Na6": { "_metadata": { "eco": "D97", "name": "Gr\u00fcnfeld Defense: Russian Variation, Prins Variation" } }, "c6": { "_metadata": { "eco": "D97", "name": "Gr\u00fcnfeld Defense: Russian Variation, Szabo Variation" } }, "Bg4": { "Be3": { "Nfd7": { "Be2": { "Nb6": { "Qd3": { "Nc6": { "1O-O-O": { "_metadata": { "eco": "D98", "name": "Gr\u00fcnfeld Defense: Russian Variation, Keres Variation" } } } } } }, "Qb3": { "_metadata": { "eco": "D99", "name": "Gr\u00fcnfeld Defense: Russian Variation, Smyslov Variation" }, "c5": { "_metadata": { "eco": "D99", "name": "Gr\u00fcnfeld Defense: Russian Variation, Yugoslav Variation" } } } } }, "_metadata": { "eco": "D98", "name": "Gr\u00fcnfeld Defense: Russian Variation, Smyslov Variation" } } } } } } } }, "_metadata": { "eco": "D90", "name": "Gr\u00fcnfeld Defense: Three Knights Variation" } }, "e3": { "Bg7": { "Qb3": { "dxc4": { "Bxc4": { "O-O": { "Nf3": { "Nbd7": { "Ng5": { "_metadata": { "eco": "D95", "name": "Gr\u00fcnfeld Defense: Pachman Variation" } } } } } } } } } } }, "_metadata": { "eco": "E61", "name": "King's Indian Defense" } }, "f3": { "d5": { "_metadata": { "eco": "D70", "name": "Neo-Gr\u00fcnfeld Defense: Goglidze Attack" } }, "_metadata": { "eco": "E60", "name": "Indian Defense: Anti-Gr\u00fcnfeld, Alekhine Variation" }, "e5": { "_metadata": { "eco": "E60", "name": "Indian Defense: Anti-Gr\u00fcnfeld, Alekhine Variation, Leko Gambit" } } }, "Nf3": { "d5": { "_metadata": { "eco": "D70", "name": "Neo-Gr\u00fcnfeld Defense: with Nf3" } }, "Bg7": { "g3": { "O-O": { "Bg2": { "d5": { "cxd5": { "Nxd5": { "O-O": { "_metadata": { "eco": "D74", "name": "Neo-Gr\u00fcnfeld Defense: Delayed Exchange Variation" }, "Nb6": { "_metadata": { "eco": "D76", "name": "Neo-Gr\u00fcnfeld Defense: Delayed Exchange Variation" } } } } } }, "c6": { "O-O": { "d5": { "_metadata": { "eco": "D78", "name": "Neo-Gr\u00fcnfeld Defense: Classical Variation, Original Defense" }, "cxd5": { "cxd5": { "_metadata": { "eco": "D79", "name": "Neo-Gr\u00fcnfeld Defense: Ultra-Delayed Exchange Variation" } } } } } }, "d6": { "O-O": { "c6": { "Nc3": { "Qa5": { "_metadata": { "eco": "E62", "name": "King's Indian Defense: Fianchetto Variation, Kavalek Defense" } } } }, "Nc6": { "Nc3": { "e5": { "_metadata": { "eco": "E62", "name": "King's Indian Defense: Fianchetto Variation, Uhlmann-Szabo System" } }, "a6": { "_metadata": { "eco": "E63", "name": "King's Indian Defense: Fianchetto Variation, Panno Variation" }, "d5": { "Na5": { "Nd2": { "c5": { "Qc2": { "e5": { "_metadata": { "eco": "E63", "name": "King's Indian Defense: Fianchetto Variation, Panno Variation, Blockade Line" } }, "Rb8": { "1b3": { "b5": { "1Bb2": { "bxc4": { "1bxc4": { "Bh6": { "_metadata": { "eco": "E63", "name": "King's Indian Defense: Fianchetto Variation, Panno Variation, Donner Line" } } } } } } } } } } } } }, "h3": { "Rb8": { "Be3": { "b5": { "Nd2": { "_metadata": { "eco": "E63", "name": "King's Indian Defense: Fianchetto Variation, Panno Variation, Korchnoi Line" } } } } } } } } }, "c5": { "Nc3": { "_metadata": { "eco": "E65", "name": "King's Indian Defense: Fianchetto Variation, Yugoslav Variation" }, "Nc6": { "dxc5": { "dxc5": { "_metadata": { "eco": "E65", "name": "King's Indian Defense: Fianchetto Variation, Yugoslav Variation, Exchange Line" } } }, "d5": { "_metadata": { "eco": "E66", "name": "King's Indian Defense: Fianchetto Variation, Yugoslav Variation, Advance Line" } } } } }, "Nbd7": { "Nc3": { "e5": { "_metadata": { "eco": "E67", "name": "King's Indian Defense: Fianchetto Variation, Classical Fianchetto" }, "e4": { "_metadata": { "eco": "E68", "name": "King's Indian Defense: Fianchetto Variation, Classical Variation" }, "c6": { "h3": { "_metadata": { "eco": "E69", "name": "King's Indian Defense: Fianchetto Variation, Classical Main Line" } } } } } } } } } } }, "d6": { "Bg2": { "O-O": { "O-O": { "Nbd7": { "Nc3": { "e5": { "b3": { "_metadata": { "eco": "E64", "name": "King's Indian Defense: Fianchetto Variation, Double Fianchetto Attack" } } }, "a6": { "_metadata": { "eco": "E64", "name": "King's Indian Defense: Fianchetto Variation, Hungarian Variation" } } } }, "c5": { "_metadata": { "eco": "E64", "name": "King's Indian Defense: Fianchetto Variation, Yugoslav System" } } } } } }, "c5": { "Bg2": { "Qa5+": { "_metadata": { "eco": "E64", "name": "King's Indian Defense: Fianchetto Variation, Pterodactyl Variation" } } } } }, "b4": { "_metadata": { "eco": "E60", "name": "King's Indian Defense: Santasiere Variation" } } } }, "g3": { "d5": { "_metadata": { "eco": "D70", "name": "Neo-Gr\u00fcnfeld Defense: with g3" } }, "Bg7": { "Bg2": { "d5": { "cxd5": { "Nxd5": { "_metadata": { "eco": "D71", "name": "Neo-Gr\u00fcnfeld Defense: Exchange Variation" } } }, "_metadata": { "eco": "E60", "name": "Gr\u00fcnfeld Defense: Counterthrust Variation" } }, "_metadata": { "eco": "E60", "name": "Indian Defense: King's Indian Variation, Fianchetto Variation" }, "O-O": { "Nc3": { "d6": { "Nf3": { "Nc6": { "_metadata": { "eco": "E62", "name": "King's Indian Defense: Fianchetto Variation, Carlsbad Variation" }, "O-O": { "Bf5": { "_metadata": { "eco": "E62", "name": "King's Indian Defense: Fianchetto Variation, Lesser Simagin (Spassky)" } } } }, "c5": { "_metadata": { "eco": "E64", "name": "King's Indian Defense: Fianchetto Variation, Yugoslav Variation, Rare Line" } }, "Nbd7": { "_metadata": { "eco": "E67", "name": "King's Indian Defense: Fianchetto Variation, Debrecen Defense" } } } } } } } }, "_metadata": { "eco": "E60", "name": "King's Indian Defense: Fianchetto Variation, Immediate Fianchetto" } }, "d5": { "b5": { "_metadata": { "eco": "E60", "name": "Indian Defense: Anti-Gr\u00fcnfeld, Adorjan Gambit" } }, "_metadata": { "eco": "E60", "name": "Indian Defense: Anti-Gr\u00fcnfeld, Advance Variation" } }, "h4": { "_metadata": { "eco": "E60", "name": "Indian Defense: Anti-Gr\u00fcnfeld, Basman-Williams Attack" } }, "_metadata": { "eco": "E60", "name": "Indian Defense: West Indian Defense" }, "Qc2": { "_metadata": { "eco": "E60", "name": "Queen's Pawn, Mengarini Attack" } } } } }, "f5": { "_metadata": { "eco": "A80", "name": "Dutch Defense" }, "Qd3": { "_metadata": { "eco": "A80", "name": "Dutch Defense: Alapin Variation" }, "e6": { "g4": { "_metadata": { "eco": "A80", "name": "Dutch Defense: Manhattan Gambit, Anti-Classical Line" } } }, "g6": { "g4": { "_metadata": { "eco": "A80", "name": "Dutch Defense: Manhattan Gambit, Anti-Leningrad" } } }, "d6": { "g4": { "_metadata": { "eco": "A80", "name": "Dutch Defense: Manhattan Gambit, Anti-Modern" } } }, "d5": { "g4": { "_metadata": { "eco": "A80", "name": "Dutch Defense: Manhattan Gambit, Anti-Stonewall" } } } }, "g4": { "e5": { "_metadata": { "eco": "A80", "name": "Dutch Defense: Hevendehl Gambit" } }, "_metadata": { "eco": "A80", "name": "Dutch Defense: Krejcik Gambit" }, "fxg4": { "e4": { "d5": { "Nc3": { "_metadata": { "eco": "A80", "name": "Dutch Defense: Krejcik Gambit, Tate Gambit" } } } } } }, "Bg5": { "_metadata": { "eco": "A80", "name": "Dutch Defense: Hopton Attack" } }, "h3": { "Nf6": { "g4": { "_metadata": { "eco": "A80", "name": "Dutch Defense: Janzen-Korchnoi Gambit" } } }, "_metadata": { "eco": "A80", "name": "Dutch Defense: Korchnoi Attack" } }, "Nc3": { "d5": { "e4": { "_metadata": { "eco": "A80", "name": "Dutch Defense: Kingfisher Gambit" } }, "_metadata": { "eco": "A80", "name": "Queen's Pawn Game: Veresov Attack, Dutch System" } }, "_metadata": { "eco": "A80", "name": "Dutch Defense: Raphael Variation" }, "Nf6": { "g4": { "_metadata": { "eco": "A80", "name": "Dutch Defense: Spielmann Gambit" } } } }, "Nf3": { "e5": { "_metadata": { "eco": "A80", "name": "Dutch Defense: Omega-Isis Gambit" } } }, "Bf4": { "e6": { "g4": { "_metadata": { "eco": "A80", "name": "Dutch Defense: Senechaud Gambit" } } } }, "g3": { "Nf6": { "Bg2": { "e6": { "Nh3": { "_metadata": { "eco": "A81", "name": "Dutch Defense: Blackburne Variation" } } }, "g6": { "_metadata": { "eco": "A81", "name": "Dutch Defense: Semi-Leningrad Variation" }, "Nf3": { "Bg7": { "O-O": { "O-O": { "c4": { "d6": { "Nc3": { "c6": { "_metadata": { "eco": "A88", "name": "Dutch Defense: Leningrad Variation, Warsaw Variation" } }, "Nc6": { "_metadata": { "eco": "A89", "name": "Dutch Defense: Leningrad Variation, Matulovic Variation" } } } } } } } } } } } }, "_metadata": { "eco": "A81", "name": "Dutch Defense: Fianchetto Attack" }, "g6": { "Bg2": { "Bg7": { "Nh3": { "_metadata": { "eco": "A81", "name": "Dutch Defense: Leningrad Variation, Carlsbad Variation" } } } } }, "c6": { "Bg2": { "g6": { "Nf3": { "Bg7": { "O-O": { "Nh6": { "_metadata": { "eco": "A81", "name": "Dutch Defense: Leningrad, Basman System" } } } } } } } } }, "e4": { "fxe4": { "Nc3": { "Nf6": { "f3": { "_metadata": { "eco": "A82", "name": "Dutch Defense: Blackmar's Second Gambit" } }, "g4": { "_metadata": { "eco": "A82", "name": "Dutch Defense: Staunton Gambit, Tartakower Variation" } }, "Bg5": { "_metadata": { "eco": "A83", "name": "Dutch Defense: Staunton Gambit" }, "g6": { "h4": { "_metadata": { "eco": "A83", "name": "Dutch Defense: Staunton Gambit, Alekhine Variation" } }, "f3": { "_metadata": { "eco": "A83", "name": "Dutch Defense: Staunton Gambit, Lasker Variation" } } }, "c6": { "_metadata": { "eco": "A83", "name": "Dutch Defense: Staunton Gambit, Chigorin Variation" } }, "b6": { "_metadata": { "eco": "A83", "name": "Dutch Defense: Staunton Gambit, Nimzowitsch Variation" } } } } }, "_metadata": { "eco": "A82", "name": "Dutch Defense: Staunton Gambit Accepted" }, "Nd2": { "_metadata": { "eco": "A82", "name": "Dutch Defense: Staunton Gambit, American Attack" } } }, "_metadata": { "eco": "A82", "name": "Dutch Defense: Staunton Gambit" } }, "c4": { "_metadata": { "eco": "A84", "name": "Dutch Defense" }, "e6": { "e4": { "_metadata": { "eco": "A84", "name": "Dutch Defense: Bellon Gambit" } }, "_metadata": { "eco": "A84", "name": "Dutch Defense: Classical Variation" }, "Nc3": { "_metadata": { "eco": "A84", "name": "Dutch Defense: Rubinstein Variation" } }, "Nf3": { "Nf6": { "g3": { "c6": { "Bg2": { "d5": { "O-O": { "Bd6": { "_metadata": { "eco": "A90", "name": "Dutch Defense: Stonewall Variation, Modern Variation" } } } } } } } } } }, "g6": { "Nc3": { "Nh6": { "_metadata": { "eco": "A84", "name": "Dutch Defense: Bladel Variation" } } } }, "Nf6": { "Nc3": { "d6": { "Nf3": { "Nc6": { "_metadata": { "eco": "A84", "name": "Dutch Defense: Krause Variation" } } } }, "_metadata": { "eco": "A85", "name": "Dutch Defense: Queen's Knight Variation" } }, "_metadata": { "eco": "A84", "name": "Dutch Defense: Normal Variation" }, "g3": { "_metadata": { "eco": "A86", "name": "Dutch Defense: Fianchetto Variation" }, "d6": { "Bg2": { "c6": { "Nc3": { "Qc7": { "_metadata": { "eco": "A86", "name": "Dutch Defense: Hort-Antoshin System" } } } } } }, "g6": { "_metadata": { "eco": "A86", "name": "Dutch Defense: Leningrad Variation" }, "Bg2": { "Bg7": { "Nf3": { "_metadata": { "eco": "A87", "name": "Dutch Defense: Leningrad Variation" } } } } }, "e6": { "Bg2": { "_metadata": { "eco": "A90", "name": "Dutch Defense: Classical Variation" }, "d5": { "Nf3": { "_metadata": { "eco": "A90", "name": "Dutch Defense: Classical Variation" } } }, "Bb4+": { "_metadata": { "eco": "A90", "name": "Dutch Defense: Nimzo-Dutch Variation" }, "Bd2": { "Be7": { "_metadata": { "eco": "A90", "name": "Dutch Defense: Nimzo-Dutch Variation, Alekhine Variation" } } } }, "Be7": { "_metadata": { "eco": "A91", "name": "Dutch Defense: Classical Variation" }, "Nh3": { "_metadata": { "eco": "A91", "name": "Dutch Defense: Classical Variation, Blackburne Attack" } }, "Nf3": { "O-O": { "O-O": { "Ne4": { "_metadata": { "eco": "A92", "name": "Dutch Defense: Alekhine Variation" } }, "d5": { "Nc3": { "_metadata": { "eco": "A92", "name": "Dutch Defense: Stonewall Variation" }, "c6": { "_metadata": { "eco": "A95", "name": "Dutch Defense: Stonewall Variation" }, "Qc2": { "Qe8": { "Bg5": { "_metadata": { "eco": "A95", "name": "Dutch Defense: Stonewall Variation, Chekhover Variation" } } } } } }, "_metadata": { "eco": "A92", "name": "Dutch Defense: Stonewall Variation" }, "b3": { "_metadata": { "eco": "A93", "name": "Dutch Defense: Stonewall Variation, Botvinnik Variation" }, "c6": { "Ba3": { "_metadata": { "eco": "A94", "name": "Dutch Defense: Stonewall Variation" } } } } }, "d6": { "_metadata": { "eco": "A96", "name": "Dutch Defense: Classical Variation" }, "Nc3": { "a5": { "_metadata": { "eco": "A96", "name": "Dutch Defense: Classical Variation, Buenos Aires Variation" } }, "Ne4": { "_metadata": { "eco": "A96", "name": "Dutch Defense: Classical Variation, Huisl Variation" } }, "Qe8": { "_metadata": { "eco": "A97", "name": "Dutch Defense: Classical Variation, Ilyin-Zhenevsky Variation" }, "Re1": { "_metadata": { "eco": "A97", "name": "Dutch Defense: Classical Variation, Ilyin-Zhenevsky Variation, Winter Variation" } }, "Qc2": { "_metadata": { "eco": "A98", "name": "Dutch Defense: Classical Variation, Ilyin-Zhenevsky Variation, Alatortsev-Lisitsyn Line" } }, "b3": { "_metadata": { "eco": "A99", "name": "Dutch Defense: Classical Variation, Ilyin-Zhenevsky Variation, Modern Main Line" } } } } } }, "_metadata": { "eco": "A92", "name": "Dutch Defense: Classical Variation" } } } } } } } } } }, "d5": { "Qd3": { "_metadata": { "eco": "D00", "name": "Amazon Attack" } }, "e4": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit" }, "dxe4": { "Nc3": { "Nf6": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit" }, "f3": { "exf3": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Accepted" }, "Nxf3": { "g6": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Accepted: Bogoljubow Defense" }, "Bc4": { "Bg7": { "O-O": { "O-O": { "Kh1": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Accepted: Bogoljubow Defense, Kloss Attack" } }, "Qe1": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Accepted: Bogoljubow Defense, Studier Attack" } } } }, "h4": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Accepted: Bogoljubow Defense, Mad Dog Attack" } }, "Ne5": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Accepted: Bogoljubow Defense, Nimzowitsch Attack" } } } } }, "e6": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Accepted: Euwe Defense" }, "Bg5": { "Be7": { "Bd3": { "Nc6": { "O-O": { "Nxd4": { "Kh1": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Accepted: Euwe Defense, Zilbermints Gambit" } } } } } } } } }, "Bf5": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Accepted: Gunderam Defense" }, "Ne5": { "e6": { "g4": { "Be4": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Accepted: Gunderam Defense, Stader Variation" } } } } } }, "Qd6": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Accepted: Holwell Defense" } }, "c5": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Accepted: Kaulich Defense" } }, "Nc6": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Accepted: Pietrowsky Defense" } }, "b6": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Accepted: Ritter Defense" } }, "Nbd7": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Accepted: Schlutter Defense" } }, "Bg4": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Accepted: Teichmann Defense" }, "h3": { "Bxf3": { "Qxf3": { "c6": { "Qf2": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Accepted: Teichmann Defense, Ciesielski Variation" } }, "Be3": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Accepted: Teichmann Defense, Classical Variation" } }, "g4": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Accepted: Teichmann Defense, Seidel-Hall Attack" } } } } } } }, "c6": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Accepted: Ziegler Defense" } } }, "Qxf3": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Accepted: Ryder Gambit" } } }, "c5": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Declined: Brombacher Countergambit" } }, "e5": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Declined: Elbert Countergambit" } }, "a6": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Declined: Gedult Defense" } }, "Nc6": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Declined: Lamb Defense" } }, "e3": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Declined: Langeheinicke Defense" } }, "c6": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Declined: O'Kelly Defense" } }, "Bf5": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Declined: Vienna Defense" } }, "e6": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit Declined: Weinsbach Defense" } } }, "Be3": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit: Rasa-Studier Gambit" } }, "Bg5": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit: von Popiel Gambit" }, "Bf5": { "Bxf6": { "exf6": { "g4": { "Bg6": { "Qe2": { "Bb4": { "Qb5+": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit: von Popiel Gambit, Zilbermints Variation" } } } } } } } } } } }, "e5": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit: Lemberger Countergambit" }, "dxe5": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit: Lemberger Countergambit, Endgame Variation" } }, "Nxe4": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit: Lemberger Countergambit, Lange Gambit" } }, "Nge2": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack" } }, "Qh5": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit: Lemberger Countergambit, Sneiders Attack" } }, "Be3": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit: Lemberger Countergambit, Soller Attack" } } }, "f5": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit: Netherlands Variation" } }, "c5": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit: Reversed Albin Countergambit" } }, "Bf5": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit: Zeller Defense" }, "f3": { "Nf6": { "Bc4": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit: Zeller Defense, Soller Attack" } } } } } }, "f3": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit: Blackmar Gambit" } }, "Be3": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit: Diemer-Rosenberg Attack" } }, "Bc4": { "_metadata": { "eco": "D00", "name": "Blackmar-Diemer Gambit: Fritz Attack" } } } }, "_metadata": { "eco": "D00", "name": "Queen's Pawn Game" }, "e3": { "_metadata": { "eco": "D00", "name": "Queen's Pawn Game" }, "Nf6": { "_metadata": { "eco": "D00", "name": "Queen's Pawn Game" }, "Bd3": { "_metadata": { "eco": "D00", "name": "Queen's Pawn Game: Stonewall Attack" } } } }, "Bf4": { "_metadata": { "eco": "D00", "name": "Queen's Pawn Game: Accelerated London System" }, "c5": { "_metadata": { "eco": "D00", "name": "Queen's Pawn Game: Accelerated London System, Steinitz Countergambit" }, "dxc5": { "_metadata": { "eco": "D00", "name": "Queen's Pawn Game: Accelerated London System, Steinitz Countergambit Accepted" } }, "e4": { "_metadata": { "eco": "D00", "name": "Queen's Pawn Game: Accelerated London System, Steinitz Countergambit, Morris Countergambit" }, "dxe4": { "_metadata": { "eco": "D00", "name": "Queen's Pawn Game: Accelerated London System, Steinitz Countergambit, Morris Countergambit Accepted" } } } } }, "Nc3": { "_metadata": { "eco": "D00", "name": "Queen's Pawn Game: Chigorin Variation" }, "e6": { "_metadata": { "eco": "D00", "name": "Queen's Pawn Game: Chigorin Variation" }, "Bf4": { "_metadata": { "eco": "D01", "name": "Rapport-Jobava System, with e6" } } }, "Bf5": { "_metadata": { "eco": "D00", "name": "Queen's Pawn Game: Chigorin Variation, Alburt Defense" } }, "Bg4": { "_metadata": { "eco": "D00", "name": "Queen's Pawn Game: Chigorin Variation, Anti-Veresov" } }, "c5": { "_metadata": { "eco": "D00", "name": "Queen's Pawn Game: Chigorin Variation, Irish Gambit" } }, "e5": { "_metadata": { "eco": "D00", "name": "Queen's Pawn Game: Chigorin Variation, Shaviliuk Gambit" } }, "h5": { "_metadata": { "eco": "D00", "name": "Queen's Pawn Game: Chigorin Variation, Shropshire Defense" } }, "Nf6": { "Bf4": { "_metadata": { "eco": "D01", "name": "Rapport-Jobava System" }, "e6": { "_metadata": { "eco": "D01", "name": "Rapport-Jobava System" } }, "g6": { "_metadata": { "eco": "D01", "name": "Rapport-Jobava System" } } } } }, "Bg5": { "_metadata": { "eco": "D00", "name": "Queen's Pawn Game: Levitsky Attack" }, "Bg4": { "_metadata": { "eco": "D00", "name": "Queen's Pawn Game: Levitsky Attack, Welling Variation" } } }, "f4": { "_metadata": { "eco": "D00", "name": "Queen's Pawn Game: Mason Attack" } }, "g4": { "_metadata": { "eco": "D00", "name": "Queen's Pawn Game: Zurich Gambit" } }, "Nf3": { "Bf5": { "c4": { "e6": { "Nc3": { "c6": { "_metadata": { "eco": "D02", "name": "Queen's Gambit Declined: Baltic Defense, Pseudo-Slav" } } } } } }, "c5": { "g3": { "cxd4": { "Bg2": { "_metadata": { "eco": "D02", "name": "Queen's Pawn Game: Chandler Gambit" } } } }, "_metadata": { "eco": "D02", "name": "Queen's Pawn Game: Krause Variation" }, "e3": { "Nf6": { "Nbd2": { "e6": { "b3": { "_metadata": { "eco": "D05", "name": "Queen's Pawn Game: Zukertort Variation" } } } } } } }, "Nc6": { "_metadata": { "eco": "D02", "name": "Queen's Pawn Game: Chigorin Variation" } }, "c6": { "Bg5": { "h6": { "Bh4": { "Qb6": { "_metadata": { "eco": "D02", "name": "Queen's Pawn Game: Levitsky Attack, Euwe Variation, Modern Line" } } } } } }, "Nf6": { "Bf4": { "_metadata": { "eco": "D02", "name": "Queen's Pawn Game: London System" } }, "_metadata": { "eco": "D02", "name": "Queen's Pawn Game: Symmetrical Variation" }, "g3": { "_metadata": { "eco": "D02", "name": "Queen's Pawn Game: Symmetrical Variation, Pseudo-Catalan" } }, "c4": { "b5": { "_metadata": { "eco": "D02", "name": "Queen's Pawn Game: Zilbermints Countergambit" } }, "c6": { "e3": { "e6": { "Nc3": { "Nbd7": { "Qc2": { "Bd6": { "b3": { "_metadata": { "eco": "D45", "name": "Semi-Slav Defense: Stoltz Variation" }, "O-O": { "Bb2": { "_metadata": { "eco": "D45", "name": "Semi-Slav Defense: Stoltz Variation" } } } } } } } } } }, "Nc3": { "e6": { "e3": { "Ne4": { "Bd3": { "f5": { "_metadata": { "eco": "D45", "name": "Semi-Slav Defense: Stonewall Defense" } } } }, "Nbd7": { "Bd3": { "dxc4": { "Bxc4": { "b5": { "Bd3": { "a6": { "e4": { "c5": { "e5": { "cxd4": { "1Nxb5": { "Nxe5": { "1Nxe5": { "axb5": { "1O-O": { "_metadata": { "eco": "D49", "name": "Semi-Slav Defense: Meran Variation, Sozin Variation" } } } } } } } } } } } } } } } } } } } } }, "e6": { "Nc3": { "Be7": { "Bg5": { "O-O": { "e3": { "Nbd7": { "Qb3": { "_metadata": { "eco": "D60", "name": "Queen's Gambit Declined: Orthodox Defense, Rauzer Variation" } }, "Rc1": { "c6": { "Qc2": { "a6": { "cxd5": { "_metadata": { "eco": "D65", "name": "Queen's Gambit Declined: Orthodox Defense, Rubinstein Attack" } } } }, "Bd3": { "dxc4": { "Bxc4": { "Nd5": { "h4": { "_metadata": { "eco": "D67", "name": "Queen's Gambit Declined: Orthodox Defense, Janowski Variation" } } } } } } } } } } } } } } } }, "Bg5": { "_metadata": { "eco": "D03", "name": "Queen's Pawn Game: Torre Attack" }, "Ne4": { "_metadata": { "eco": "D03", "name": "Queen's Pawn Game: Torre Attack, Gossip Variation" } }, "g6": { "_metadata": { "eco": "D03", "name": "Queen's Pawn Game: Torre Attack, Gr\u00fcnfeld Variation" } } }, "e3": { "_metadata": { "eco": "D04", "name": "Queen's Pawn Game: Colle System" }, "Bf5": { "_metadata": { "eco": "D04", "name": "Queen's Pawn Game: Colle System, Anti-Colle" } }, "g6": { "Bd3": { "Bg7": { "_metadata": { "eco": "D04", "name": "Queen's Pawn Game: Colle System, Gr\u00fcnfeld Formation" } } } }, "e6": { "_metadata": { "eco": "D05", "name": "Queen's Pawn Game: Colle System" }, "Bd3": { "_metadata": { "eco": "D05", "name": "Queen's Pawn Game: Colle System" }, "Bd6": { "O-O": { "O-O": { "b3": { "Nbd7": { "Bb2": { "_metadata": { "eco": "D05", "name": "Rubinstein Opening: Semi-Slav Defense" }, "c6": { "_metadata": { "eco": "D05", "name": "Rubinstein Opening: Semi-Slav Defense" }, "Nbd2": { "_metadata": { "eco": "D05", "name": "Rubinstein Opening: Semi-Slav Defense" } } } } } } } } } } } } }, "e6": { "Bf4": { "_metadata": { "eco": "D02", "name": "Queen's Pawn Game: London System, with e6" } } }, "_metadata": { "eco": "D02", "name": "Queen's Pawn Game: Zukertort Variation" } }, "c4": { "_metadata": { "eco": "D06", "name": "Queen's Gambit" }, "c5": { "dxc5": { "d4": { "_metadata": { "eco": "D06", "name": "Queen's Gambit Declined: Austrian Attack, Salvio Countergambit" } } }, "_metadata": { "eco": "D06", "name": "Queen's Gambit Declined: Austrian Defense" }, "cxd5": { "Nf6": { "_metadata": { "eco": "D06", "name": "Queen's Gambit Declined: Austrian Defense, Gusev Countergambit" }, "e4": { "Nxe4": { "dxc5": { "Qa5+": { "_metadata": { "eco": "D06", "name": "Queen's Gambit Declined: Austrian Defense, Haberditz Variation" } } } } } } } }, "Bf5": { "_metadata": { "eco": "D06", "name": "Queen's Gambit Declined: Baltic Defense" }, "cxd5": { "Bxb1": { "Qa4+": { "c6": { "dxc6": { "Nxc6": { "_metadata": { "eco": "D06", "name": "Queen's Gambit Declined: Baltic Defense, Argentinian Gambit" } } } } } } }, "Nc3": { "e6": { "Nf3": { "Nc6": { "_metadata": { "eco": "D06", "name": "Queen's Gambit Declined: Baltic Defense, Pseudo-Chigorin" } } }, "Qb3": { "_metadata": { "eco": "D06", "name": "Queen's Gambit Declined: Baltic Defense, Queen Attack Deferred" } } } }, "Qb3": { "_metadata": { "eco": "D06", "name": "Queen's Gambit Declined: Baltic Defense, Queen Attack" } } }, "Nf6": { "_metadata": { "eco": "D06", "name": "Queen's Gambit Declined: Marshall Defense" }, "cxd5": { "c6": { "_metadata": { "eco": "D06", "name": "Queen's Gambit Declined: Marshall Defense, Tan Gambit" } } } }, "b5": { "_metadata": { "eco": "D06", "name": "Queen's Gambit Declined: Zilbermints Gambit" } }, "Nc6": { "_metadata": { "eco": "D07", "name": "Queen's Gambit Declined: Chigorin Defense" }, "Nc3": { "_metadata": { "eco": "D07", "name": "Queen's Gambit Declined: Chigorin Defense" }, "dxc4": { "_metadata": { "eco": "D07", "name": "Queen's Gambit Declined: Chigorin Defense" }, "Nf3": { "_metadata": { "eco": "D07", "name": "Queen's Gambit Declined: Chigorin Defense, Janowski Variation" }, "Nf6": { "_metadata": { "eco": "D07", "name": "Queen's Gambit Declined: Chigorin Defense, Modern Gambit" } } } }, "e5": { "_metadata": { "eco": "D07", "name": "Queen's Gambit Declined: Chigorin Defense, Tartakower Gambit" } } }, "cxd5": { "Qxd5": { "_metadata": { "eco": "D07", "name": "Queen's Gambit Declined: Chigorin Defense, Exchange Variation" }, "e3": { "e5": { "Nc3": { "Bb4": { "Bd2": { "Bxc3": { "Bxc3": { "exd4": { "Ne2": { "_metadata": { "eco": "D07", "name": "Queen's Gambit Declined: Chigorin Defense, Exchange Variation, Costa's Line" } } } } } } } } } } } }, "Nf3": { "e5": { "_metadata": { "eco": "D07", "name": "Queen's Gambit Declined: Chigorin Defense, Lazard Gambit" } }, "Bg4": { "_metadata": { "eco": "D07", "name": "Queen's Gambit Declined: Chigorin Defense, Main Line" }, "Qa4": { "_metadata": { "eco": "D07", "name": "Queen's Gambit Declined: Chigorin Defense, Main Line, Alekhine Variation" } } } } }, "e5": { "_metadata": { "eco": "D08", "name": "Queen's Gambit Declined: Albin Countergambit" }, "dxe5": { "d4": { "Nf3": { "Nc6": { "Nbd2": { "Qe7": { "_metadata": { "eco": "D08", "name": "Queen's Gambit Declined: Albin Countergambit, Balogh Variation" } }, "f6": { "_metadata": { "eco": "D08", "name": "Queen's Gambit Declined: Albin Countergambit, Janowski Variation" } }, "Bg4": { "h3": { "Bxf3": { "Nxf3": { "Bb4+": { "Bd2": { "Qe7": { "_metadata": { "eco": "D08", "name": "Queen's Gambit Declined: Albin Countergambit, Krenosz Variation" } } } } } } } }, "_metadata": { "eco": "D08", "name": "Queen's Gambit Declined: Albin Countergambit, Modern Line" } }, "g3": { "_metadata": { "eco": "D09", "name": "Queen's Gambit Declined: Albin Countergambit, Fianchetto Variation" }, "Be6": { "_metadata": { "eco": "D09", "name": "Queen's Gambit Declined: Albin Countergambit, Fianchetto Variation, Be6 Line" } }, "Bf5": { "_metadata": { "eco": "D09", "name": "Queen's Gambit Declined: Albin Countergambit, Fianchetto Variation, Bf5 Line" } }, "Bg4": { "_metadata": { "eco": "D09", "name": "Queen's Gambit Declined: Albin Countergambit, Fianchetto Variation, Bg4 Line" } } } }, "_metadata": { "eco": "D08", "name": "Queen's Gambit Declined: Albin Countergambit, Normal Line" }, "c5": { "_metadata": { "eco": "D08", "name": "Queen's Gambit Declined: Albin Countergambit, Tartakower Defense" } } }, "e3": { "Bb4+": { "Bd2": { "dxe3": { "_metadata": { "eco": "D08", "name": "Queen's Gambit Declined: Albin Countergambit, Lasker Trap" } } } } } } } }, "c6": { "_metadata": { "eco": "D10", "name": "Slav Defense" }, "Nc3": { "_metadata": { "eco": "D10", "name": "Slav Defense" }, "dxc4": { "_metadata": { "eco": "D10", "name": "Slav Defense" }, "e4": { "_metadata": { "eco": "D10", "name": "Slav Defense: Slav Gambit, Alekhine Attack" } } }, "e5": { "_metadata": { "eco": "D10", "name": "Slav Defense: Winawer Countergambit" }, "e4": { "_metadata": { "eco": "D10", "name": "Slav Defense: Winawer Countergambit, Anti-Winawer Gambit" } } }, "Nf6": { "e3": { "e6": { "Nf3": { "a6": { "_metadata": { "eco": "D45", "name": "Semi-Slav Defense: Accelerated Meran Variation" } }, "_metadata": { "eco": "D45", "name": "Semi-Slav Defense: Main Line" }, "Nbd7": { "_metadata": { "eco": "D45", "name": "Semi-Slav Defense: Normal Variation" }, "Qc2": { "_metadata": { "eco": "D45", "name": "Semi-Slav Defense: Stoltz Variation" }, "b6": { "b3": { "_metadata": { "eco": "D45", "name": "Semi-Slav Defense: Stoltz Variation" }, "Bb7": { "Bd3": { "Be7": { "O-O": { "O-O": { "Bb2": { "_metadata": { "eco": "D46", "name": "Semi-Slav Defense: Main Line" } } } } } } } } } }, "Bd3": { "Be7": { "_metadata": { "eco": "D46", "name": "Semi-Slav Defense: Bogoljubow Variation" } }, "Bd6": { "_metadata": { "eco": "D46", "name": "Semi-Slav Defense: Chigorin Defense" }, "Qc2": { "_metadata": { "eco": "D46", "name": "Semi-Slav Defense: Chigorin Defense" } } }, "dxc4": { "Bxc4": { "b5": { "Bd3": { "Bd6": { "O-O": { "Bb7": { "a3": { "O-O": { "1Qc2": { "_metadata": { "eco": "D46", "name": "Semi-Slav Defense: Chigorin Defense" } } } } } } }, "Bb7": { "_metadata": { "eco": "D47", "name": "Semi-Slav Defense: Meran Variation, Wade Variation" }, "e4": { "b4": { "Na4": { "c5": { "1e5": { "Nd5": { "1O-O": { "cxd4": { "1Nxd4": { "_metadata": { "eco": "D47", "name": "Semi-Slav Defense: Meran Variation, Wade Variation, Kaidanov Gambit" } } } }, "_metadata": { "eco": "D47", "name": "Semi-Slav Defense: Meran Variation, Wade Variation, Larsen Variation" } } } } } } } }, "a6": { "_metadata": { "eco": "D48", "name": "Semi-Slav Defense: Meran Variation" }, "e4": { "c5": { "_metadata": { "eco": "D48", "name": "Semi-Slav Defense: Meran Variation" }, "e5": { "_metadata": { "eco": "D48", "name": "Semi-Slav Defense: Meran Variation, Old Variation" }, "cxd4": { "1Nxb5": { "_metadata": { "eco": "D49", "name": "Semi-Slav Defense: Meran Variation, Blumenfeld Variation" }, "Ng4": { "_metadata": { "eco": "D49", "name": "Semi-Slav Defense: Meran Variation, Rabinovich Variation" } }, "Nxe5": { "1Nxe5": { "axb5": { "1Qf3": { "_metadata": { "eco": "D49", "name": "Semi-Slav Defense: Meran Variation, Stahlberg Variation" } } } } } } } } } } } }, "_metadata": { "eco": "D47", "name": "Semi-Slav Defense: Meran Variation" } }, "_metadata": { "eco": "D47", "name": "Semi-Slav Defense: Semi-Meran Variation" } } }, "_metadata": { "eco": "D46", "name": "Semi-Slav Defense: Main Line" }, "Bb4": { "_metadata": { "eco": "D46", "name": "Semi-Slav Defense: Romih Variation" } } } } } }, "g6": { "Nf3": { "Bg7": { "Bd3": { "O-O": { "O-O": { "Bf5": { "_metadata": { "eco": "D94", "name": "Gr\u00fcnfeld Defense: Flohr Defense" } }, "Bg4": { "_metadata": { "eco": "D94", "name": "Gr\u00fcnfeld Defense: Smyslov Defense" } } } } } } } } }, "Nf3": { "e6": { "e3": { "Nbd7": { "Bd3": { "dxc4": { "Bxc4": { "b5": { "Bd3": { "a6": { "e4": { "c5": { "e5": { "cxd4": { "1Nxb5": { "Nxe5": { "1Nxe5": { "axb5": { "1O-O": { "Qd5": { "1Qe2": { "Ba6": { "1Bg5": { "_metadata": { "eco": "D49", "name": "Semi-Slav Defense: Meran Variation, Rellstab Attack" } } } } } } } } } } } } } } } } } } } } } } } } } }, "e4": { "_metadata": { "eco": "D10", "name": "Slav Defense: Diemer Gambit" } }, "cxd5": { "_metadata": { "eco": "D10", "name": "Slav Defense: Exchange Variation" }, "cxd5": { "Nc3": { "Nf6": { "f3": { "_metadata": { "eco": "D10", "name": "Slav Defense: Exchange Variation, Boor Attack" } }, "Nf3": { "Nc6": { "Bf4": { "Bf5": { "_metadata": { "eco": "D14", "name": "Slav Defense: Exchange Variation, Symmetrical Line" } } } } } } } } }, "Nf3": { "Nf6": { "Bg5": { "_metadata": { "eco": "D11", "name": "Slav Defense: Bonet Gambit" } }, "Nbd2": { "_metadata": { "eco": "D11", "name": "Slav Defense: Breyer Variation" } }, "g3": { "dxc4": { "Bg2": { "g6": { "_metadata": { "eco": "D11", "name": "Slav Defense: Modern Line" } } } } }, "e3": { "_metadata": { "eco": "D11", "name": "Slav Defense: Quiet Variation" }, "Bg4": { "_metadata": { "eco": "D11", "name": "Slav Defense: Quiet Variation, Pin Defense" } }, "Bf5": { "cxd5": { "cxd5": { "Nc3": { "e6": { "Ne5": { "Nfd7": { "_metadata": { "eco": "D12", "name": "Slav Defense: Quiet Variation, Amsterdam Variation" } } } }, "_metadata": { "eco": "D13", "name": "Slav Defense: Exchange Variation, Schallopp Variation" } }, "Qb3": { "Qc8": { "Bd2": { "e6": { "Na3": { "_metadata": { "eco": "D12", "name": "Slav Defense: Quiet Variation, Landau Variation" } } } } } } } }, "_metadata": { "eco": "D12", "name": "Slav Defense: Quiet Variation, Schallopp Defense" } }, "e6": { "Nbd2": { "Nbd7": { "Bd3": { "c5": { "_metadata": { "eco": "D30", "name": "Queen's Gambit Declined: Semmering Variation" } } }, "_metadata": { "eco": "D30", "name": "Semi-Slav Defense: Quiet Variation" } }, "Ne4": { "Bd3": { "f5": { "_metadata": { "eco": "D30", "name": "Queen's Gambit Declined: Stonewall Variation" } } } }, "_metadata": { "eco": "D30", "name": "Semi-Slav Defense: Quiet Variation" } } } }, "cxd5": { "cxd5": { "_metadata": { "eco": "D13", "name": "Slav Defense: Exchange Variation" }, "Nc3": { "Nc6": { "Bf4": { "Bf5": { "e3": { "e6": { "Qb3": { "Bb4": { "_metadata": { "eco": "D14", "name": "Slav Defense: Exchange Variation, Trifunovic Variation" } } } } } } } } } } }, "Nc3": { "dxc4": { "e3": { "_metadata": { "eco": "D15", "name": "Slav Defense: Alekhine Variation" } }, "e4": { "_metadata": { "eco": "D15", "name": "Slav Defense: Geller Gambit" }, "b5": { "e5": { "_metadata": { "eco": "D15", "name": "Slav Defense: Geller Gambit" } } } }, "_metadata": { "eco": "D15", "name": "Slav Defense: Two Knights Attack" }, "a4": { "_metadata": { "eco": "D16", "name": "Slav Defense: Alapin Variation" }, "Na6": { "_metadata": { "eco": "D16", "name": "Slav Defense: Smyslov Variation" } }, "e6": { "_metadata": { "eco": "D16", "name": "Slav Defense: Soultanbeieff Variation" } }, "Bg4": { "_metadata": { "eco": "D16", "name": "Slav Defense: Steiner Variation" } }, "Bf5": { "_metadata": { "eco": "D17", "name": "Slav Defense: Czech Variation" }, "Nh4": { "_metadata": { "eco": "D17", "name": "Slav Defense: Czech Variation, Bled Attack" } }, "Ne5": { "Nbd7": { "Nxc4": { "Qc7": { "g3": { "e5": { "_metadata": { "eco": "D17", "name": "Slav Defense: Czech Variation, Carlsbad Variation" }, "dxe5": { "Nxe5": { "Bf4": { "Nfd7": { "1Bg2": { "g5": { "_metadata": { "eco": "D17", "name": "Slav Defense: Czech Variation, Carlsbad Variation, Morozevich Variation" } } } } } } } } } } } }, "_metadata": { "eco": "D17", "name": "Slav Defense: Czech Variation, Krause Attack" }, "Na6": { "e4": { "_metadata": { "eco": "D17", "name": "Slav Defense: Czech Variation, Krause Attack, Fazekas Gambit" } } }, "e6": { "_metadata": { "eco": "D17", "name": "Slav Defense: Czech Variation, Wiesbaden Variation" }, "f3": { "Bb4": { "e4": { "_metadata": { "eco": "D17", "name": "Slav Defense: Czech Variation, Wiesbaden Variation, Sharp Line" } } } } } }, "e3": { "_metadata": { "eco": "D18", "name": "Slav Defense: Czech Variation, Classical System" }, "Na6": { "_metadata": { "eco": "D18", "name": "Slav Defense: Czech Variation, Lasker Variation" } }, "e6": { "Bxc4": { "Bb4": { "O-O": { "O-O": { "Qe2": { "_metadata": { "eco": "D19", "name": "Slav Defense: Czech Variation, Classical System, Main Line" }, "Ne4": { "g4": { "_metadata": { "eco": "D19", "name": "Slav Defense: Czech Variation, Dutch Variation, S\u00e4misch Variation" } } } } }, "_metadata": { "eco": "D19", "name": "Slav Defense: Czech Variation, Dutch Variation" } } } } } } } } }, "a6": { "_metadata": { "eco": "D15", "name": "Slav Defense: Chebanenko Variation" }, "c5": { "_metadata": { "eco": "D15", "name": "Slav Defense: Chebanenko Variation, Advance System" } } }, "g6": { "_metadata": { "eco": "D15", "name": "Slav Defense: Schlechter Variation" } }, "Qb6": { "_metadata": { "eco": "D15", "name": "Slav Defense: S\u00fcchting Variation" } }, "_metadata": { "eco": "D15", "name": "Slav Defense: Three Knights Variation" }, "e6": { "Bg5": { "h6": { "Bxf6": { "Qxf6": { "Qb3": { "_metadata": { "eco": "D43", "name": "Queen's Gambit Declined: Hastings Variation" } } } }, "Bh4": { "_metadata": { "eco": "D43", "name": "Semi-Slav Defense: Anti-Moscow Gambit" } } }, "dxc4": { "_metadata": { "eco": "D44", "name": "Semi-Slav Defense Accepted" }, "e4": { "_metadata": { "eco": "D44", "name": "Semi-Slav Defense: Botvinnik Variation" }, "b5": { "e5": { "h6": { "Bh4": { "g5": { "Nxg5": { "_metadata": { "eco": "D44", "name": "Semi-Slav Defense: Botvinnik Variation" }, "hxg5": { "Bxg5": { "Nbd7": { "1g3": { "_metadata": { "eco": "D44", "name": "Semi-Slav Defense: Botvinnik Variation, Lilienthal Variation" } } } } } }, "exf6": { "gxh4": { "Ne5": { "_metadata": { "eco": "D44", "name": "Semi-Slav Defense: Botvinnik Variation, Ekstrom Variation" } } } } } } } } } } }, "Nbd7": { "e3": { "_metadata": { "eco": "D52", "name": "Queen's Gambit Declined" }, "Qa5": { "_metadata": { "eco": "D52", "name": "Queen's Gambit Declined: Cambridge Springs Defense" }, "cxd5": { "_metadata": { "eco": "D52", "name": "Queen's Gambit Declined: Cambridge Springs Defense" }, "Nxd5": { "_metadata": { "eco": "D52", "name": "Queen's Gambit Declined: Cambridge Springs Defense, Yugoslav Variation" } } }, "Nd2": { "Bb4": { "Qc2": { "_metadata": { "eco": "D52", "name": "Queen's Gambit Declined: Cambridge Springs Defense, Bogoljubow Variation" } } }, "dxc4": { "_metadata": { "eco": "D52", "name": "Queen's Gambit Declined: Cambridge Springs Defense, Rubinstein Variation" } } } } } } }, "_metadata": { "eco": "D43", "name": "Semi-Slav Defense" }, "e3": { "Nbd7": { "Qc2": { "Bd6": { "e4": { "_metadata": { "eco": "D45", "name": "Semi-Slav Defense: Stoltz Variation, Center Variation" }, "dxe4": { "Nxe4": { "Nxe4": { "Qxe4": { "e5": { "dxe5": { "_metadata": { "eco": "D45", "name": "Semi-Slav Defense: Stoltz Variation, Center Variation, Mikhalchishin Line" } } } } } } } }, "g4": { "_metadata": { "eco": "D45", "name": "Semi-Slav Defense: Stoltz Variation, Shabalov Attack" } } } }, "Bd3": { "dxc4": { "Bxc4": { "b5": { "Bd3": { "b4": { "_metadata": { "eco": "D47", "name": "Semi-Slav Defense: Meran Variation, Lundin Variation" } }, "a6": { "e4": { "c5": { "d5": { "_metadata": { "eco": "D48", "name": "Semi-Slav Defense: Meran Variation, Reynolds' Variation" } }, "e5": { "cxd4": { "1Nxb5": { "Nxe5": { "_metadata": { "eco": "D49", "name": "Semi-Slav Defense: Meran Variation, Sozin Variation" } } } } } } } } } } } } } } } } }, "Qc2": { "e6": { "Nbd2": { "Be7": { "g3": { "Nbd7": { "Bg2": { "O-O": { "O-O": { "b5": { "_metadata": { "eco": "E09", "name": "Catalan Opening: Closed Variation, Rabinovich Variation" } } } } } } } } } } } }, "_metadata": { "eco": "D11", "name": "Slav Defense: Modern Line" }, "e6": { "e3": { "Nf6": { "Nc3": { "Bd6": { "Bd3": { "dxc4": { "Bxc4": { "b5": { "Bd3": { "Nbd7": { "O-O": { "O-O": { "Qc2": { "_metadata": { "eco": "D46", "name": "Semi-Slav Defense: Chigorin Defense" } } } } } } } } } } } } } } } } }, "dxc4": { "_metadata": { "eco": "D20", "name": "Queen's Gambit Accepted" }, "Qa4+": { "_metadata": { "eco": "D20", "name": "Queen's Gambit Accepted: Accelerated Mannheim Variation" } }, "e4": { "Nf6": { "_metadata": { "eco": "D20", "name": "Queen's Gambit Accepted: Central Variation, Alekhine System" } }, "b5": { "_metadata": { "eco": "D20", "name": "Queen's Gambit Accepted: Central Variation, Greco Variation" } }, "e5": { "_metadata": { "eco": "D20", "name": "Queen's Gambit Accepted: Central Variation, McDonnell Defense" }, "Bxc4": { "_metadata": { "eco": "D20", "name": "Queen's Gambit Accepted: Central Variation, McDonnell Defense, Somov Gambit" } } }, "Nc6": { "_metadata": { "eco": "D20", "name": "Queen's Gambit Accepted: Central Variation, Modern Defense" } }, "c5": { "_metadata": { "eco": "D20", "name": "Queen's Gambit Accepted: Central Variation, Rubinstein Defense" }, "d5": { "b5": { "_metadata": { "eco": "D20", "name": "Queen's Gambit Accepted: Central Variation, Rubinstein Defense, Yefimov Gambit" } }, "Nf6": { "Nc3": { "b5": { "_metadata": { "eco": "D20", "name": "Queen's Gambit Accepted: Linares Variation" } } } } } }, "_metadata": { "eco": "D20", "name": "Queen's Gambit Accepted: Saduleto Variation" }, "f5": { "_metadata": { "eco": "D20", "name": "Queen's Gambit Accepted: Schwartz Defense" } } }, "e3": { "_metadata": { "eco": "D20", "name": "Queen's Gambit Accepted: Old Variation" }, "e5": { "Bxc4": { "exd4": { "Qb3": { "Qe7": { "a3": { "_metadata": { "eco": "D20", "name": "Queen's Gambit Accepted: Old Variation, Billinger Gambit" } }, "Nf3": { "_metadata": { "eco": "D20", "name": "Queen's Gambit Accepted: Old Variation, Christensen Gambit" } }, "Kf1": { "_metadata": { "eco": "D20", "name": "Queen's Gambit Accepted: Old Variation, Korchnoi Gambit" } }, "Nd2": { "_metadata": { "eco": "D20", "name": "Queen's Gambit Accepted: Old Variation, Novikov Gambit" } } } } } } }, "Nf6": { "Bxc4": { "e6": { "Nf3": { "c5": { "O-O": { "a6": { "e4": { "_metadata": { "eco": "D27", "name": "Queen's Gambit Accepted: Classical Defense, Russian Gambit" } } } } } } } } } }, "Nf3": { "a6": { "e4": { "_metadata": { "eco": "D21", "name": "Queen's Gambit Accepted: Alekhine Defense, Borisenko-Furman Variation" } }, "_metadata": { "eco": "D22", "name": "Queen's Gambit Accepted: Alekhine Defense" }, "e3": { "Bg4": { "Bxc4": { "e6": { "d5": { "_metadata": { "eco": "D22", "name": "Queen's Gambit Accepted: Alekhine Defense, Alatortsev Variation" } } } } }, "b5": { "_metadata": { "eco": "D22", "name": "Queen's Gambit Accepted: Alekhine Defense, Haberditz Variation" } } } }, "Nd7": { "_metadata": { "eco": "D21", "name": "Queen's Gambit Accepted: Godes Variation" } }, "c5": { "_metadata": { "eco": "D21", "name": "Queen's Gambit Accepted: Gunsberg Defense" } }, "_metadata": { "eco": "D21", "name": "Queen's Gambit Accepted: Normal Variation" }, "e6": { "_metadata": { "eco": "D21", "name": "Queen's Gambit Accepted: Rosenthal Variation" } }, "b5": { "_metadata": { "eco": "D21", "name": "Queen's Gambit Accepted: Slav Gambit" } }, "Nf6": { "_metadata": { "eco": "D23", "name": "Queen's Gambit Accepted" }, "Qa4+": { "_metadata": { "eco": "D23", "name": "Queen's Gambit Accepted: Mannheim Variation" } }, "Nc3": { "a6": { "e4": { "_metadata": { "eco": "D24", "name": "Queen's Gambit Accepted: Bogoljubow Defense" } } }, "c5": { "d5": { "e6": { "e4": { "exd5": { "e5": { "_metadata": { "eco": "D24", "name": "Queen's Gambit Accepted: Gunsberg Defense, Prianishenmo Gambit" } } } } } } }, "_metadata": { "eco": "D24", "name": "Queen's Gambit Accepted: Showalter Variation" } }, "e3": { "Bg4": { "_metadata": { "eco": "D25", "name": "Queen's Gambit Accepted: Janowski-Larsen Variation" } }, "_metadata": { "eco": "D25", "name": "Queen's Gambit Accepted: Normal Variation" }, "g6": { "_metadata": { "eco": "D25", "name": "Queen's Gambit Accepted: Smyslov Variation" } }, "Be6": { "_metadata": { "eco": "D25", "name": "Queen's Gambit Accepted: Winawer Defense" } }, "e6": { "Bxc4": { "c5": { "_metadata": { "eco": "D26", "name": "Queen's Gambit Accepted: Classical Defense" }, "O-O": { "_metadata": { "eco": "D26", "name": "Queen's Gambit Accepted: Classical Defense, Normal Line" }, "Nc6": { "_metadata": { "eco": "D26", "name": "Queen's Gambit Accepted: Classical Defense, Steinitz Variation, Development Variation" } }, "cxd4": { "_metadata": { "eco": "D26", "name": "Queen's Gambit Accepted: Classical Defense, Steinitz Variation, Exchange Variation" } }, "a6": { "_metadata": { "eco": "D27", "name": "Queen's Gambit Accepted: Classical Defense, Main Line" }, "a4": { "_metadata": { "eco": "D27", "name": "Queen's Gambit Accepted: Classical Defense, Rubinstein Variation" } }, "dxc5": { "Bxc5": { "_metadata": { "eco": "D27", "name": "Queen's Gambit Accepted: Furman Variation" } } }, "Qe2": { "_metadata": { "eco": "D28", "name": "Queen's Gambit Accepted: Classical Defense, Alekhine System" }, "b5": { "_metadata": { "eco": "D28", "name": "Queen's Gambit Accepted: Classical Defense, Alekhine System" }, "Bb3": { "Nc6": { "Rd1": { "c4": { "Bc2": { "Nb4": { "1Nc3": { "Nxc2": { "1Qxc2": { "Bb7": { "1d5": { "Qc7": { "_metadata": { "eco": "D28", "name": "Queen's Gambit Accepted: Classical, Flohr Variation" } } } } } } } } } } } }, "Bb7": { "_metadata": { "eco": "D29", "name": "Queen's Gambit Accepted: Classical Defense, Alekhine System, Main Line" }, "Rd1": { "Nbd7": { "Nc3": { "Bd6": { "_metadata": { "eco": "D29", "name": "Queen's Gambit Accepted: Classical Defense, Alekhine System, Smyslov Variation" } } } } } } } } } } }, "Qe2": { "a6": { "dxc5": { "Bxc5": { "O-O": { "Nc6": { "e4": { "b5": { "e5": { "_metadata": { "eco": "D26", "name": "Queen's Gambit Accepted: Classical, Furman Variation" } } } } } } } } } } } }, "_metadata": { "eco": "D26", "name": "Queen's Gambit Accepted: Normal Variation, Traditional System" } } } } } }, "e6": { "Nf3": { "Nf6": { "Nc3": { "dxc4": { "e4": { "_metadata": { "eco": "D24", "name": "Queen's Gambit Accepted" } } }, "Be7": { "Bg5": { "O-O": { "e3": { "Nbd7": { "Rc1": { "c6": { "Bd3": { "dxc4": { "Bxc4": { "Nd5": { "Bxe7": { "Qxe7": { "1O-O": { "Nxc3": { "1Rxc3": { "e5": { "1Qb1": { "_metadata": { "eco": "D68", "name": "Queen's Gambit Declined: Orthodox Defense, Classical Variation" } } } } } } } } } } } } } } } } } } } }, "e3": { "c6": { "Nbd2": { "g6": { "_metadata": { "eco": "D30", "name": "Queen's Gambit Declined: Spielmann Variation" } } } } } }, "c5": { "_metadata": { "eco": "D30", "name": "Queen's Gambit Declined: Tarrasch Defense, Pseudo-Tarrasch" }, "cxd5": { "exd5": { "Bg5": { "_metadata": { "eco": "D30", "name": "Queen's Gambit Declined: Tarrasch Defense, Pseudo-Tarrasch Bishop Attack" } }, "g3": { "Nc6": { "Bg2": { "Nf6": { "O-O": { "Be7": { "Nc3": { "O-O": { "Bg5": { "Be6": { "Rc1": { "b6": { "_metadata": { "eco": "D34", "name": "Queen's Gambit Declined: Tarrasch Defense, Stoltz Variation" } } } } } } } } } } } } } } } }, "c6": { "Nc3": { "dxc4": { "a4": { "Bb4": { "e3": { "b5": { "Bd2": { "Qb6": { "_metadata": { "eco": "D31", "name": "Queen's Gambit Declined: Semi-Slav, Junge Variation" } } } } } } } } } } }, "_metadata": { "eco": "D30", "name": "Queen's Gambit Declined" }, "Nc3": { "Be7": { "_metadata": { "eco": "D31", "name": "Queen's Gambit Declined: Charousek Variation" }, "e4": { "dxe4": { "f3": { "_metadata": { "eco": "D31", "name": "Queen's Gambit Declined: Charousek Variation, Miladinovic Gambit" } } } }, "Nf3": { "Nf6": { "Bg5": { "h6": { "Bh4": { "O-O": { "Rc1": { "dxc4": { "_metadata": { "eco": "D31", "name": "Queen's Gambit Declined: Uhlmann Variation" } } }, "e3": { "Ne4": { "_metadata": { "eco": "D56", "name": "Queen's Gambit Declined: Lasker Defense" }, "Bxe7": { "Qxe7": { "cxd5": { "Nxc3": { "bxc3": { "_metadata": { "eco": "D57", "name": "Queen's Gambit Declined: Lasker Defense, Main Line" } } } } } } }, "b6": { "cxd5": { "exd5": { "_metadata": { "eco": "D58", "name": "Queen's Gambit Declined: Tartakower Defense, Exchange Variation" } }, "Nxd5": { "Bxe7": { "Qxe7": { "Nxd5": { "exd5": { "1Rc1": { "Be6": { "_metadata": { "eco": "D59", "name": "Queen's Gambit Declined: Tartakower Defense" } } } } } } }, "_metadata": { "eco": "D59", "name": "Queen's Gambit Declined: Tartakower Defense, Makogonov Exchange Variation" } } } } } } } } }, "Bf4": { "O-O": { "e3": { "b6": { "_metadata": { "eco": "D37", "name": "Queen's Gambit Declined: Harrwitz Attack, Fianchetto Defense" } } } } } } } }, "a6": { "_metadata": { "eco": "D31", "name": "Queen's Gambit Declined: Janowski Variation" } }, "_metadata": { "eco": "D31", "name": "Queen's Gambit Declined: Queen's Knight Variation" }, "c6": { "Nf3": { "dxc4": { "a4": { "Bb4": { "e3": { "b5": { "Bd2": { "a5": { "_metadata": { "eco": "D31", "name": "Queen's Gambit Declined: Semi-Slav, Abrahams Variation" } } } }, "Bxc3+": { "bxc3": { "b5": { "axb5": { "cxb5": { "_metadata": { "eco": "D31", "name": "Semi-Slav Defense: Noteboom Variation, Abrahams Variation" } } } } } } } } }, "e3": { "b5": { "a4": { "Bb4": { "Bd2": { "Qe7": { "_metadata": { "eco": "D31", "name": "Queen's Gambit Declined: Semi-Slav, Koomen Variation" } } } } } } }, "_metadata": { "eco": "D31", "name": "Semi-Slav Defense: Noteboom Variation" }, "g3": { "_metadata": { "eco": "D31", "name": "Semi-Slav Defense: Noteboom Variation, Anti-Noteboom Gambit" } }, "Bg5": { "_metadata": { "eco": "D31", "name": "Semi-Slav Defense: Noteboom Variation, Anti-Noteboom Variation" }, "f6": { "_metadata": { "eco": "D31", "name": "Semi-Slav Defense: Noteboom Variation, Anti-Noteboom Variation, Belyavsky Line" } } } }, "Nf6": { "e3": { "Nbd7": { "Ne5": { "_metadata": { "eco": "D45", "name": "Semi-Slav Defense: Rubinstein System" } } } } } }, "_metadata": { "eco": "D31", "name": "Semi-Slav Defense: Accelerated Move Order" }, "e3": { "f5": { "g4": { "_metadata": { "eco": "D31", "name": "Semi-Slav Defense: Anti-Noteboom, Stonewall Variation, Portisch Gambit" } } }, "Nf6": { "Nf3": { "Nbd7": { "Bd3": { "dxc4": { "Bxc4": { "b5": { "Bd3": { "a6": { "e4": { "b4": { "_metadata": { "eco": "D48", "name": "Semi-Slav Defense: Meran Variation, Pirc Variation" } } } } } } } } } } } } }, "e4": { "dxe4": { "f3": { "_metadata": { "eco": "D31", "name": "Semi-Slav Defense: Gunderam Gambit" } }, "Nxe4": { "Bb4+": { "Nc3": { "_metadata": { "eco": "D31", "name": "Semi-Slav Defense: Marshall Gambit, Forgotten Variation" } }, "Bd2": { "_metadata": { "eco": "D31", "name": "Semi-Slav Defense: Marshall Gambit, Main Line" }, "Qxd4": { "Bxb4": { "Qxe4+": { "Be2": { "c5": { "Bxc5": { "Qxg2": { "_metadata": { "eco": "D31", "name": "Semi-Slav Defense: Marshall Gambit, Tolush Variation" } } } } } } } } } } } }, "_metadata": { "eco": "D31", "name": "Semi-Slav Defense: Marshall Gambit" } } }, "c5": { "cxd5": { "exd5": { "_metadata": { "eco": "D32", "name": "Queen's Gambit Declined: Tarrasch Defense" }, "Nf3": { "Nc6": { "dxc5": { "d4": { "Na4": { "b5": { "_metadata": { "eco": "D32", "name": "Tarrasch Defense: Gr\u00fcnfeld Gambit" } } } } }, "g3": { "Nf6": { "Bg2": { "cxd4": { "Nxd4": { "Bc5": { "_metadata": { "eco": "D33", "name": "Tarrasch Defense: Dubov Tarrasch" } } } }, "Bg4": { "_metadata": { "eco": "D33", "name": "Tarrasch Defense: Wagner Variation" } }, "Be7": { "O-O": { "O-O": { "_metadata": { "eco": "D34", "name": "Tarrasch Defense: Classical Variation" }, "Bg5": { "c4": { "_metadata": { "eco": "D34", "name": "Tarrasch Defense: Classical Variation, Advance Variation" } }, "_metadata": { "eco": "D34", "name": "Tarrasch Defense: Classical Variation, Carlsbad Variation" }, "cxd4": { "Nxd4": { "h6": { "1Be3": { "Re8": { "1Rc1": { "Be6": { "_metadata": { "eco": "D34", "name": "Tarrasch Defense: Classical Variation, Chandler Variation" } } }, "_metadata": { "eco": "D34", "name": "Tarrasch Defense: Classical Variation, Main Line" } }, "Bg4": { "_metadata": { "eco": "D34", "name": "Tarrasch Defense: Classical Variation, Spassky Variation" } } } }, "Re8": { "_metadata": { "eco": "D34", "name": "Tarrasch Defense: Classical Variation, Petursson Variation" } } } }, "Be6": { "_metadata": { "eco": "D34", "name": "Tarrasch Defense: Classical Variation, Endgame Variation" } } }, "dxc5": { "d4": { "_metadata": { "eco": "D34", "name": "Tarrasch Defense: Classical Variation, Classical Tarrasch Gambit" } }, "Bxc5": { "Na4": { "_metadata": { "eco": "D34", "name": "Tarrasch Defense: Classical Variation, R\u00fcti Variation" } } } } } }, "_metadata": { "eco": "D34", "name": "Tarrasch Defense: Prague Variation, Main Line" } } }, "_metadata": { "eco": "D33", "name": "Tarrasch Defense: Prague Variation" } }, "_metadata": { "eco": "D33", "name": "Tarrasch Defense: Rubinstein System" }, "c4": { "_metadata": { "eco": "D33", "name": "Tarrasch Defense: Swedish Variation" }, "e4": { "_metadata": { "eco": "D33", "name": "Tarrasch Defense: Swedish Variation, Central Break" } } } } }, "_metadata": { "eco": "D32", "name": "Tarrasch Defense: Two Knights Variation" } }, "e4": { "_metadata": { "eco": "D32", "name": "Tarrasch Defense: Marshall Gambit" } }, "dxc5": { "d4": { "Na4": { "b5": { "_metadata": { "eco": "D32", "name": "Tarrasch Defense: Tarrasch Gambit" } } } } } }, "cxd4": { "_metadata": { "eco": "D32", "name": "Tarrasch Defense: Schara Gambit" }, "Qxd4": { "Nc6": { "Qd1": { "exd5": { "Qxd5": { "Be6": { "_metadata": { "eco": "D32", "name": "Tarrasch Defense: von Hennig Gambit" } } } } } } } } }, "_metadata": { "eco": "D32", "name": "Tarrasch Defense" }, "e3": { "Nf6": { "Nf3": { "Nc6": { "_metadata": { "eco": "D32", "name": "Tarrasch Defense: Symmetrical Variation" } } } } } }, "Nf6": { "Bf4": { "_metadata": { "eco": "D35", "name": "Queen's Gambit Declined: Harrwitz Attack" } }, "_metadata": { "eco": "D35", "name": "Queen's Gambit Declined: Normal Defense" }, "Nf3": { "Be7": { "Bf4": { "O-O": { "e3": { "c6": { "_metadata": { "eco": "D37", "name": "Queen's Gambit Declined: Harrwitz Attack, Orthodox Defense" } } } } } }, "c5": { "e3": { "Nc6": { "Bd3": { "Bd6": { "O-O": { "O-O": { "Qe2": { "Qe7": { "dxc5": { "Bxc5": { "e4": { "_metadata": { "eco": "D40", "name": "Queen's Gambit Declined: Semi-Tarrasch Defense, Levenfish Variation" } } } } } }, "_metadata": { "eco": "D40", "name": "Queen's Gambit Declined: Semi-Tarrasch Defense, Symmetrical Variation" } } } } } } }, "Bg5": { "_metadata": { "eco": "D40", "name": "Queen's Gambit Declined: Semi-Tarrasch Defense, Pillsbury Variation" } }, "cxd5": { "Nxd5": { "e4": { "Nxc3": { "bxc3": { "cxd4": { "cxd4": { "Bb4+": { "Bd2": { "Bxd2+": { "Qxd2": { "O-O": { "1Bb5": { "_metadata": { "eco": "D41", "name": "Queen's Gambit Declined: Semi-Tarrasch Defense, Kmoch Variation" } } } } } } } } } } } } } } } }, "cxd5": { "Nxd5": { "e4": { "Nxc3": { "bxc3": { "c5": { "Nf3": { "cxd4": { "cxd4": { "Bb4+": { "Bd2": { "Qa5": { "_metadata": { "eco": "D41", "name": "Queen's Gambit Declined: Semi-Tarrasch Defense, San Sebastian Variation" } } } } } } } } } } } } }, "Bg5": { "c5": { "_metadata": { "eco": "D50", "name": "Queen's Gambit Declined: Been-Koomen Variation" }, "cxd5": { "_metadata": { "eco": "D50", "name": "Queen's Gambit Declined: Pseudo-Tarrasch Variation" }, "Qb6": { "_metadata": { "eco": "D50", "name": "Queen's Gambit Declined: Pseudo-Tarrasch Variation, Canal Variation" } } }, "Nf3": { "cxd4": { "Qxd4": { "_metadata": { "eco": "D50", "name": "Queen's Gambit Declined: Pseudo-Tarrasch Variation, Primitive Pillsbury Variation" } }, "Nxd4": { "e5": { "Ndb5": { "a6": { "Qa4": { "_metadata": { "eco": "D50", "name": "Queen's Gambit Declined: Semi-Tarrasch Defense, Krause Variation" } } } } } } } } }, "_metadata": { "eco": "D50", "name": "Queen's Gambit Declined: Modern Variation" }, "Nbd7": { "Nf3": { "c6": { "e4": { "_metadata": { "eco": "D51", "name": "Queen's Gambit Declined: Alekhine Variation" } }, "Rc1": { "Qa5": { "Bd2": { "_metadata": { "eco": "D51", "name": "Queen's Gambit Declined: Rochlin Variation" } } } } } }, "e3": { "c6": { "a3": { "_metadata": { "eco": "D51", "name": "Queen's Gambit Declined: Capablanca Variation, Anti-Cambridge Springs Variation" } }, "_metadata": { "eco": "D51", "name": "Queen's Gambit Declined: Modern Variation, Knight Defense" }, "Nf3": { "Qa5": { "Nd2": { "Bb4": { "Qc2": { "O-O": { "Bh4": { "_metadata": { "eco": "D52", "name": "Queen's Gambit Declined: Cambridge Springs Defense, Argentine Variation" } } } } } }, "Bxf6": { "_metadata": { "eco": "D52", "name": "Queen's Gambit Declined: Cambridge Springs Defense, Capablanca Variation" } } } } }, "Bb4": { "_metadata": { "eco": "D51", "name": "Queen's Gambit Declined: Manhattan Variation" } }, "_metadata": { "eco": "D51", "name": "Queen's Gambit Declined: Modern Variation, Knight Defense" } }, "_metadata": { "eco": "D51", "name": "Queen's Gambit Declined: Modern Variation, Knight Defense" } }, "Be7": { "_metadata": { "eco": "D53", "name": "Queen's Gambit Declined" }, "Bxf6": { "_metadata": { "eco": "D53", "name": "Queen's Gambit Declined: Modern Variation, Heral Variation" } }, "e3": { "O-O": { "Nf3": { "h6": { "Bh4": { "Ne4": { "Bxe7": { "Qxe7": { "Qc2": { "Nf6": { "Bd3": { "dxc4": { "1Bxc4": { "c5": { "1O-O": { "Nc6": { "1Rfd1": { "Bd7": { "_metadata": { "eco": "D56", "name": "Queen's Gambit Declined: Lasker Defense, Russian Variation" } } } } } } } } } } }, "cxd5": { "Nxc3": { "bxc3": { "exd5": { "1Qb3": { "Rd8": { "1c4": { "Be6": { "_metadata": { "eco": "D57", "name": "Queen's Gambit Declined: Lasker Defense, Bernstein Variation, Mar del Plata Gambit" } } } } } } } } } } } } } }, "Nbd7": { "Rc1": { "c6": { "Bd3": { "_metadata": { "eco": "D66", "name": "Queen's Gambit Declined: Orthodox Defense, Bd3 Line" }, "dxc4": { "Bxc4": { "Nd5": { "Bxe7": { "Qxe7": { "1Ne4": { "_metadata": { "eco": "D67", "name": "Queen's Gambit Declined: Orthodox Defense, Alekhine Variation" } }, "_metadata": { "eco": "D67", "name": "Queen's Gambit Declined: Orthodox Defense, Bd3 Line" }, "1O-O": { "_metadata": { "eco": "D67", "name": "Queen's Gambit Declined: Orthodox Defense, Main Line" }, "Nxc3": { "1Rxc3": { "e5": { "_metadata": { "eco": "D68", "name": "Queen's Gambit Declined: Orthodox Defense, Classical Variation" }, "1dxe5": { "Nxe5": { "1Nxe5": { "Qxe5": { "_metadata": { "eco": "D69", "name": "Queen's Gambit Declined: Orthodox Defense, Classical Variation" } } } } } } } } } } }, "_metadata": { "eco": "D67", "name": "Queen's Gambit Declined: Orthodox Defense, Capablanca System" } } } } } } } } } } } }, "c6": { "Nf3": { "Be7": { "e3": { "Nbd7": { "Rc1": { "O-O": { "Bd3": { "dxc4": { "Bxc4": { "b5": { "_metadata": { "eco": "D66", "name": "Queen's Gambit Declined: Orthodox Defense, Fianchetto Variation" } } } } } } } } } } } } } } } } } } } };