[
  {
    "name": "e4",
    "positions": [
      {
        "eco": "B00",
        "fen": "rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq e3 1 1",
        "name": "King's Pawn"
      },
      {
        "eco": "B00",
        "fen": "rnbqkbnr/pppp1ppp/8/4p3/4P3/8/PPPP1PPP/RNBQKBNR w KQkq - 0 2",
        "name": "Open Game"
      },
      {
        "eco": "B02",
        "fen": "rnbqkb1r/pppppppp/5n2/8/4P3/8/PPPP1PPP/RNBQKBNR w KQkq - 2 2",
        "name": "Alekhine's Defence"
      },
      {
        "eco": "B04",
        "fen": "rnbqkb1r/ppp1pppp/3p4/3nP3/3P4/5N2/PPP2PPP/RNBQKB1R b KQkq - 1 4",
        "name": "Alekhine's Defence: Modern Variation"
      },
      {
        "eco": "C23",
        "fen": "rnbqkbnr/pppp1ppp/8/4p3/2B1P3/8/PPPP1PPP/RNBQK1NR b KQkq - 2 2",
        "name": "Bishop's Opening"
      },
      {
        "eco": "B10",
        "fen": "rnbqkbnr/pp1ppppp/2p5/8/4P3/8/PPPP1PPP/RNBQKBNR w KQkq - 1 2",
        "name": "Caro-Kann Defence"
      },
      {
        "eco": "B12",
        "fen": "rnbqkbnr/pp2pppp/2p5/3pP3/3P4/8/PPP2PPP/RNBQKBNR b KQkq - 1 3",
        "name": "Caro-Kann Defence: Advance Variation"
      },
      {
        "eco": "B18",
        "fen": "rn1qkbnr/pp2pppp/2p5/5b2/3PN3/8/PPP2PPP/R1BQKBNR w KQkq - 2 5",
        "name": "Caro-Kann Defence: Classical Variation"
      },
      {
        "eco": "B13",
        "fen": "rnbqkbnr/pp2pppp/2p5/3P4/3P4/8/PPP2PPP/RNBQKBNR b KQkq - 1 3",
        "name": "Caro-Kann Defence: Exchange Variation"
      },
      {
        "eco": "B14",
        "fen": "rnbqkb1r/pp3ppp/4pn2/3p4/2PP4/2N5/PP3PPP/R1BQKBNR w KQkq - 1 6",
        "name": "Caro-Kann Defence: Panov-Botvinnik Attack"
      },
      {
        "eco": "B14",
        "fen": "rnbqkb1r/pp3ppp/4pn2/3p4/2PP4/2N5/PP3PPP/R1BQKBNR w KQkq - 1 6",
        "name": "Caro-Kann Defence: Steinitz Variation"
      },
      {
        "eco": "C21",
        "fen": "rnbqkbnr/pppp1ppp/8/8/3pP3/2P5/PP3PPP/RNBQKBNR b KQkq - 1 3",
        "name": "Danish Gambit"
      },
      {
        "eco": "C46",
        "fen": "r1bqkb1r/pppp1ppp/2n2n2/4p3/4P3/2N2N2/PPPP1PPP/R1BQKB1R w KQkq - 5 4",
        "name": "Four Knights Game"
      },
      {
        "eco": "C47",
        "fen": "r1bqkb1r/pppp1ppp/2n2n2/4p3/3PP3/2N2N2/PPP2PPP/R1BQKB1R b KQkq d3 1 4",
        "name": "Four Knights Game: Scotch Variation"
      },
      {
        "eco": "C48",
        "fen": "r1bqkb1r/pppp1ppp/2n2n2/1B2p3/4P3/2N2N2/PPPP1PPP/R1BQK2R b KQkq - 0 4",
        "name": "Four Knights Game: Spanish Variation"
      },
      {
        "eco": "C00",
        "fen": "rnbqkbnr/pppp1ppp/4p3/8/4P3/8/PPPP1PPP/RNBQKBNR w KQkq - 1 2",
        "name": "French Defence"
      },
      {
        "eco": "C02",
        "fen": "rnbqkbnr/ppp2ppp/4p3/3pP3/3P4/8/PPP2PPP/RNBQKBNR b KQkq - 1 3",
        "name": "French Defence: Advance Variation"
      },
      {
        "eco": "C11",
        "fen": "rnbqkb1r/ppp2ppp/4pn2/3p2B1/3PP3/2N5/PPP2PPP/R2QKBNR b KQkq - 1 4",
        "name": "French Defence: Burn Variation"
      },
      {
        "eco": "C11",
        "fen": "rnbqkb1r/ppp2ppp/4pn2/3p4/3PP3/2N5/PPP2PPP/R1BQKBNR w KQkq - 3 4",
        "name": "French Defence: Classical Variation"
      },
      {
        "eco": "C01",
        "fen": "rnbqkbnr/ppp2ppp/4p3/3P4/3P4/8/PPP2PPP/RNBQKBNR b KQkq - 1 3",
        "name": "French Defence: Exchange Variation"
      },
      {
        "eco": "C10",
        "fen": "rnbqkbnr/ppp2ppp/4p3/8/3Pp3/2N5/PPP2PPP/R1BQKBNR w KQkq - 1 4",
        "name": "French Defence: Rubinstein Variation"
      },
      {
        "eco": "C03",
        "fen": "rnbqkbnr/ppp2ppp/4p3/3p4/3PP3/8/PPPN1PPP/R1BQKBNR b KQkq - 2 3",
        "name": "French Defence: Tarrasch Variation"
      },
      {
        "eco": "C15",
        "fen": "rnbqk1nr/ppp2ppp/4p3/3p4/1b1PP3/2N5/PPP2PPP/R1BQKBNR w KQkq - 3 4",
        "name": "French Defence: Winawer Variation"
      },
      {
        "eco": "C50",
        "fen": "r1bqk1nr/pppp1ppp/2n5/2b1p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 5 4",
        "name": "Giuoco Piano"
      },
      {
        "eco": "C50",
        "fen": "r1bqkbnr/pppp1ppp/2n5/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R b KQkq - 4 3",
        "name": "Italian Game"
      },
      {
        "eco": "C51",
        "fen": "r1bqk1nr/pppp1ppp/2n5/2b1p3/1PB1P3/5N2/P1PP1PPP/RNBQK2R b KQkq b3 1 4",
        "name": "Italian Game: Evans Gambit"
      },
      {
        "eco": "C50",
        "fen": "r1bqk1nr/ppppbppp/2n5/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 5 4",
        "name": "Italian Game: Hungarian Defence"
      },
      {
        "eco": "C55",
        "fen": "r1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 5 4",
        "name": "Italian Game: Two Knights Defence"
      },
      {
        "eco": "C30",
        "fen": "rnbqkbnr/pppp1ppp/8/4p3/4PP2/8/PPPP2PP/RNBQKBNR b KQkq f3 1 2",
        "name": "King's Gambit"
      },
      {
        "eco": "C33",
        "fen": "rnbqkbnr/pppp1ppp/8/8/4Pp2/8/PPPP2PP/RNBQKBNR w KQkq - 1 3",
        "name": "King's Gambit Accepted"
      },
      {
        "eco": "C33",
        "fen": "rnbqkbnr/pppp1ppp/8/8/2B1Pp2/8/PPPP2PP/RNBQK1NR b KQkq - 2 3",
        "name": "King's Gambit Accepted: Bishop's Gambit"
      },
      {
        "eco": "C36",
        "fen": "rnbqkbnr/ppp2ppp/8/3p4/4Pp2/5N2/PPPP2PP/RNBQKB1R w KQkq d6 1 4",
        "name": "King's Gambit Accepted: Modern Defence"
      },
      {
        "eco": "C30",
        "fen": "rnbqkbnr/pppp1p1p/8/6p1/4Pp2/5N2/PPPP2PP/RNBQKB1R w KQkq - 0 4",
        "name": "King's Gambit Accepted: Classical Variation"
      },
      {
        "eco": "C30",
        "fen": "rnbqk1nr/pppp1ppp/8/2b1p3/4PP2/8/PPPP2PP/RNBQKBNR w KQkq - 2 3",
        "name": "King's Gambit Declined: Classical Variation"
      },
      {
        "eco": "C31",
        "fen": "rnbqkbnr/ppp2ppp/8/3pp3/4PP2/8/PPPP2PP/RNBQKBNR w KQkq d6 1 3",
        "name": "King's Gambit Declined: Falkbeer Countergambit"
      },
      {
        "eco": "B06",
        "fen": "rnbqkbnr/pppppp1p/6p1/8/4P3/8/PPPP1PPP/RNBQKBNR w KQkq - 0 2",
        "name": "Modern Defence"
      },
      {
        "eco": "B06",
        "fen": "rnbqk1nr/ppppppbp/6p1/8/3PP3/2N5/PPP2PPP/R1BQKBNR b KQkq - 0 3",
        "name": "Modern Defence: Robatsch Defence"
      },
      {
        "eco": "C41",
        "fen": "rnbqkbnr/ppp2ppp/3p4/4p3/4P3/5N2/PPPP1PPP/RNBQKB1R w KQkq - 1 3",
        "name": "Philidor Defence"
      },
      {
        "eco": "B07",
        "fen": "rnbqkb1r/ppp1pppp/3p1n2/8/3PP3/8/PPP2PPP/RNBQKBNR w KQkq - 2 3",
        "name": "Pirc Defence"
      },
      {
        "eco": "B09",
        "fen": "rnbqkb1r/ppp1pp1p/3p1np1/8/3PPP2/2N5/PPP3PP/R1BQKBNR b KQkq f3 1 4",
        "name": "Pirc Defence: Austrian Attack"
      },
      {
        "eco": "B07",
        "fen": "rnbqkb1r/ppp1pp1p/3p1np1/8/3PP3/2N2N2/PPP2PPP/R1BQKB1R b KQkq - 2 4",
        "name": "Pirc Defence: Classical Variation"
      },
      {
        "eco": "C42",
        "fen": "rnbqkb1r/pppp1ppp/5n2/4p3/4P3/5N2/PPPP1PPP/RNBQKB1R w KQkq - 3 3",
        "name": "Petrov's Defence"
      },
      {
        "eco": "C42",
        "fen": "rnbqkb1r/ppp2ppp/3p4/8/3Pn3/5N2/PPP2PPP/RNBQKB1R b KQkq d3 1 5",
        "name": "Petrov's Defence: Classical Attack"
      },
      {
        "eco": "C43",
        "fen": "rnbqkb1r/pppp1ppp/5n2/4p3/3PP3/5N2/PPP2PPP/RNBQKB1R b KQkq d3 1 3",
        "name": "Petrov's Defence: Steinitz Attack"
      },
      {
        "eco": "C42",
        "fen": "rnbqkb1r/pppp1ppp/5n2/4p3/4P3/2N2N2/PPPP1PPP/R1BQKB1R b KQkq - 4 3",
        "name": "Petrov's Defence: Three Knights Game"
      },
      {
        "eco": "C60",
        "fen": "r1bqkbnr/pppp1ppp/2n5/1B2p3/4P3/5N2/PPPP1PPP/RNBQK2R b KQkq - 4 3",
        "name": "Ruy Lopez"
      },
      {
        "eco": "C65",
        "fen": "r1bqkb1r/pppp1ppp/2n2n2/1B2p3/4P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 5 4",
        "name": "Ruy Lopez: Berlin Defence"
      },
      {
        "eco": "C64",
        "fen": "r1bqk1nr/pppp1ppp/2n5/1Bb1p3/4P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 5 4",
        "name": "Ruy Lopez: Classical Variation"
      },
      {
        "eco": "C84",
        "fen": "r1bqk2r/2ppbppp/p1n2n2/1p2p3/4P3/1B3N2/PPPP1PPP/RNBQR1K1 b kq - 0 7",
        "name": "Ruy Lopez: Closed Variation"
      },
      {
        "eco": "C68",
        "fen": "r1bqkbnr/1ppp1ppp/p1B5/4p3/4P3/5N2/PPPP1PPP/RNBQK2R b KQkq - 1 4",
        "name": "Ruy Lopez: Exchange Variation"
      },
      {
        "eco": "C89",
        "fen": "r1bq1rk1/2p1bppp/p1n2n2/1p1pp3/4P3/1BP2N2/PP1P1PPP/RNBQR1K1 w - - 0 9",
        "name": "Ruy Lopez: Marshall Attack"
      },
      {
        "eco": "C63",
        "fen": "r1bqkbnr/pppp2pp/2n5/1B2pp2/4P3/5N2/PPPP1PPP/RNBQK2R w KQkq f6 1 4",
        "name": "Ruy Lopez: Schliemann Defence"
      },
      {
        "eco": "B01",
        "fen": "rnbqkbnr/ppp1pppp/8/3p4/4P3/8/PPPP1PPP/RNBQKBNR w KQkq d6 1 2",
        "name": "Scandinavian Defence"
      },
      {
        "eco": "B01",
        "fen": "rnbqkb1r/ppp1pppp/5n2/3P4/3P4/8/PPP2PPP/RNBQKBNR b KQkq - 0 3",
        "name": "Scandinavian Defence: Modern Variation"
      },
      {
        "eco": "C44",
        "fen": "r1bqkbnr/pppp1ppp/2n5/4p3/3PP3/5N2/PPP2PPP/RNBQKB1R b KQkq d3 1 3",
        "name": "Scotch Game"
      },
      {
        "eco": "C45",
        "fen": "r1bqk1nr/pppp1ppp/2n5/2b5/3NP3/8/PPP2PPP/RNBQKB1R w KQkq - 2 5",
        "name": "Scotch Game: Classical Variation"
      },
      {
        "eco": "C45",
        "fen": "r1bqkb1r/p1pp1ppp/2p2n2/4P3/8/8/PPP2PPP/RNBQKB1R b KQkq - 1 6",
        "name": "Scotch Game: Mieses Variation"
      },
      {
        "eco": "C45",
        "fen": "r1b1kbnr/pppp1ppp/2n5/8/3NP2q/8/PPP2PPP/RNBQKB1R w KQkq - 2 5",
        "name": "Scotch Game: Steinitz Variation"
      },
      {
        "eco": "B20",
        "fen": "rnbqkbnr/pp1ppppp/8/2p5/4P3/8/PPPP1PPP/RNBQKBNR w KQkq c6 1 2",
        "name": "Sicilian Defence"
      },
      {
        "eco": "B36",
        "fen": "r1bqkbnr/pp1ppp1p/2n3p1/8/3NP3/8/PPP2PPP/RNBQKB1R w KQkq - 1 5",
        "name": "Sicilian Defence: Accelerated Dragon"
      },
      {
        "eco": "B22",
        "fen": "rnbqkbnr/pp1ppppp/8/2p5/4P3/2P5/PP1P1PPP/RNBQKBNR b KQkq - 1 2",
        "name": "Sicilian Defence: Alapin Variation"
      },
      {
        "eco": "B23",
        "fen": "rnbqkbnr/pp1ppppp/8/2p5/4P3/2N5/PPPP1PPP/R1BQKBNR b KQkq - 2 2",
        "name": "Sicilian Defence: Closed Variation"
      },
      {
        "eco": "B70",
        "fen": "rnbqkb1r/pp2pp1p/3p1np1/8/3NP3/2N5/PPP2PPP/R1BQKB1R w KQkq - 1 6",
        "name": "Sicilian Defence: Dragon Variation"
      },
      {
        "eco": "B23",
        "fen": "r1bqkbnr/pp1ppppp/2n5/2p5/4PP2/2N5/PPPP2PP/R1BQKBNR b KQkq f3 1 3",
        "name": "Sicilian Defence: Grand Prix Attack"
      },
      {
        "eco": "B27",
        "fen": "rnbqkbnr/pp1ppp1p/6p1/2p5/4P3/5N2/PPPP1PPP/RNBQKB1R w KQkq - 1 2",
        "name": "Sicilian Defence: Hyper-Accelerated Dragon"
      },
      {
        "eco": "B41",
        "fen": "rnbqkbnr/1p1p1ppp/p3p3/8/3NP3/8/PPP2PPP/RNBQKB1R w KQkq - 1 5",
        "name": "Sicilian Defence: Kan Variation"
      },
      {
        "eco": "B90",
        "fen": "rnbqkb1r/1p2pppp/p2p1n2/8/3NP3/2N5/PPP2PPP/R1BQKB1R w KQkq - 1 6",
        "name": "Sicilian Defence: Najdorf Variation"
      },
      {
        "eco": "B60",
        "fen": "r1bqkb1r/pp2pppp/2np1n2/6B1/3NP3/2N5/PPP2PPP/R2QKB1R b KQkq - 5 6",
        "name": "Sicilian Defence: Richter-Rauzer Variation"
      },
      {
        "eco": "B80",
        "fen": "rnbqkb1r/pp3ppp/3ppn2/8/3NP3/2N5/PPP2PPP/R1BQKB1R w KQkq - 1 6",
        "name": "Sicilian Defence: Scheveningen Variation"
      },
      {
        "eco": "B21",
        "fen": "rnbqkbnr/pp1ppppp/8/8/3pP3/2P5/PP3PPP/RNBQKBNR b KQkq - 1 3",
        "name": "Sicilian Defence: Smith-Morra Gambit"
      },
      {
        "eco": "C27",
        "fen": "rnbqkbnr/pppp1ppp/8/4p3/4P3/2N5/PPPP1PPP/R1BQKBNR b KQkq - 2 2",
        "name": "Vienna Game"
      },
      {
        "eco": "C27",
        "fen": "rnbqkb1r/pppp1ppp/8/4p3/2B1n3/2N5/PPPP1PPP/R1BQK1NR w KQkq - 0 4",
        "name": "Frankenstein-Dracula Variation"
      },
      {
        "eco": "C47",
        "fen": "r1bqkb1r/pppp1ppp/2n2n2/4N3/4P3/2N5/PPPP1PPP/R1BQKB1R b KQkq - 1 4",
        "name": "Halloween Gambit"
      },
      {
        "eco": "420",
        "fen": "rnbqkbnr/pppp1ppp/8/4p3/4P3/8/PPPPKPPP/RNBQ1BNR b kq - 0 2",
        "name": "Bongcloud Attack"
      }
    ]
  },
  {
    "name": "d4",
    "positions": [
      {
        "eco": "A40",
        "fen": "rnbqkbnr/pppppppp/8/8/3P4/8/PPP1PPPP/RNBQKBNR b KQkq d3 1 1",
        "name": "Queen's Pawn"
      },
      {
        "eco": "A57",
        "fen": "rnbqkb1r/p2ppppp/5n2/1ppP4/2P5/8/PP2PPPP/RNBQKBNR w KQkq b6 1 4",
        "name": "Benko Gambit"
      },
      {
        "eco": "A61",
        "fen": "rnbqkb1r/pp1p1ppp/4pn2/2pP4/2P5/8/PP2PPPP/RNBQKBNR w KQkq - 0 4",
        "name": "Benoni Defence: Modern Benoni"
      },
      {
        "eco": "A43",
        "fen": "rnbqkb1r/pp1p1ppp/5n2/2pPp3/2P5/8/PP2PPPP/RNBQKBNR w KQkq - 0 4",
        "name": "Benoni Defence: Czech Benoni"
      },
      {
        "eco": "D00",
        "fen": "rnbqkbnr/ppp1pppp/8/3p4/3PP3/8/PPP2PPP/RNBQKBNR b KQkq e3 1 2",
        "name": "Blackmar-Diemer Gambit"
      },
      {
        "eco": "E11",
        "fen": "rnbqk2r/pppp1ppp/4pn2/8/1bPP4/5N2/PP2PPPP/RNBQKB1R w KQkq - 3 4",
        "name": "Bogo-Indian Defence"
      },
      {
        "eco": "E00",
        "fen": "rnbqkb1r/pppp1ppp/4pn2/8/2PP4/6P1/PP2PP1P/RNBQKBNR b KQkq - 1 3",
        "name": "Catalan Opening"
      },
      {
        "eco": "E06",
        "fen": "rnbqk2r/ppp1bppp/4pn2/3p4/2PP4/5NP1/PP2PPBP/RNBQK2R b KQkq - 4 5",
        "name": "Catalan Opening: Closed Variation"
      },
      {
        "eco": "A80",
        "fen": "rnbqkbnr/ppppp1pp/8/5p2/3P4/8/PPP1PPPP/RNBQKBNR w KQkq f6 1 2",
        "name": "Dutch Defence"
      },
      {
        "eco": "A87",
        "fen": "rnbqk2r/ppppp1bp/5np1/5p2/2PP4/5NP1/PP2PPBP/RNBQK2R b KQkq - 4 5",
        "name": "Dutch Defence: Leningrad Variation"
      },
      {
        "eco": "A83",
        "fen": "rnbqkb1r/ppppp1pp/5n2/6B1/3Pp3/2N5/PPP2PPP/R2QKBNR b KQkq - 4 4",
        "name": "Dutch Defence: Staunton Gambit"
      },
      {
        "eco": "A92",
        "fen": "rnbq1rk1/ppp1b1pp/4pn2/3p1p2/2PP4/5NP1/PP2PPBP/RNBQ1RK1 w - d6 1 7",
        "name": "Dutch Defence: Stonewall Variation"
      },
      {
        "eco": "D80",
        "fen": "rnbqkb1r/ppp1pp1p/5np1/3p4/2PP4/2N5/PP2PPPP/R1BQKBNR w KQkq d6 1 4",
        "name": "Gr\u00fcnfeld Defence"
      },
      {
        "eco": "D82",
        "fen": "rnbqkb1r/ppp1pp1p/5np1/3p4/2PP1B2/2N5/PP2PPPP/R2QKBNR b KQkq - 2 4",
        "name": "Gr\u00fcnfeld Defence: Brinckmann Attack"
      },
      {
        "eco": "D85",
        "fen": "rnbqkb1r/ppp1pp1p/6p1/3n4/3P4/2N5/PP2PPPP/R1BQKBNR w KQkq - 1 5",
        "name": "Gr\u00fcnfeld Defence: Exchange Variation"
      },
      {
        "eco": "D80",
        "fen": "rnbqkb1r/ppp1pp1p/5np1/3p4/2PP4/1QN5/PP2PPPP/R1B1KBNR b KQkq - 0 4",
        "name": "Gr\u00fcnfeld Defence: Russian Variation"
      },
      {
        "eco": "D90",
        "fen": "rnbqk2r/ppp1ppbp/5np1/3p2B1/2PP4/2N2N2/PP2PPPP/R2QKB1R b KQkq - 0 5",
        "name": "Gr\u00fcnfeld Defence: Taimanov Variation"
      },
      {
        "eco": "E61",
        "fen": "rnbqkb1r/pppppp1p/5np1/8/2PP4/8/PP2PPPP/RNBQKBNR w KQkq - 1 3",
        "name": "King's Indian Defence"
      },
      {
        "eco": "E77",
        "fen": "rnbqk2r/ppp1ppbp/3p1np1/8/2PPP3/2N5/PP3PPP/R1BQKBNR w KQkq - 1 5",
        "name": "King's Indian Defence: 4.e4"
      },
      {
        "eco": "E73",
        "fen": "rnbq1rk1/ppp1ppbp/3p1np1/6B1/2PPP3/2N5/PP2BPPP/R2QK1NR b KQ - 4 6",
        "name": "King's Indian Defence: Averbakh Variation"
      },
      {
        "eco": "E62",
        "fen": "rnbqk2r/ppp1ppbp/3p1np1/8/2PP4/2N2NP1/PP2PP1P/R1BQKB1R b KQkq - 1 5",
        "name": "King's Indian Defence: Fianchetto Variation"
      },
      {
        "eco": "E76",
        "fen": "rnbqk2r/ppp1ppbp/3p1np1/8/2PPPP2/2N5/PP4PP/R1BQKBNR b KQkq f3 1 5",
        "name": "King's Indian Defence: Four Pawns Attack"
      },
      {
        "eco": "E91",
        "fen": "rnbq1rk1/ppp1ppbp/3p1np1/8/2PPP3/2N2N2/PP2BPPP/R1BQK2R b KQ - 4 6",
        "name": "King's Indian Defence: Classical Variation"
      },
      {
        "eco": "E80",
        "fen": "rnbqk2r/ppp1ppbp/3p1np1/8/2PPP3/2N2P2/PP4PP/R1BQKBNR b KQkq - 1 5",
        "name": "King's Indian Defence: S\u00e4misch Variation"
      },
      {
        "eco": "A41",
        "fen": "rnbqk1nr/ppp1ppbp/3p2p1/8/2PP4/2N5/PP2PPPP/R1BQKBNR w KQkq - 1 4",
        "name": "Queens's Pawn Game: Modern Defence"
      },
      {
        "eco": "E20",
        "fen": "rnbqk2r/pppp1ppp/4pn2/8/1bPP4/2N5/PP2PPPP/R1BQKBNR w KQkq - 3 4",
        "name": "Nimzo-Indian Defence"
      },
      {
        "eco": "E32",
        "fen": "rnbqk2r/pppp1ppp/4pn2/8/1bPP4/2N5/PPQ1PPPP/R1B1KBNR b KQkq - 4 4",
        "name": "Nimzo-Indian Defence: Classical Variation"
      },
      {
        "eco": "E43",
        "fen": "rnbqk2r/p1pp1ppp/1p2pn2/8/1bPP4/2N1P3/PP3PPP/R1BQKBNR w KQkq - 0 5",
        "name": "Nimzo-Indian Defence: Fischer Variation",
        "wikiPath": "Nimzo-Indian_Defence#4...b6"
      },
      {
        "eco": "E41",
        "fen": "r1bqk2r/pp3ppp/2nppn2/2p5/2PP4/2PBPN2/P4PPP/R1BQK2R w KQkq - 0 8",
        "name": "Nimzo-Indian Defence: H\u00fcbner Variation"
      },
      {
        "eco": "E21",
        "fen": "rnbqk2r/pppp1ppp/4pn2/8/1bPP4/2N2N2/PP2PPPP/R1BQKB1R b KQkq - 0 4",
        "name": "Nimzo-Indian Defence: Kasparov Variation"
      },
      {
        "eco": "E30",
        "fen": "rnbqk2r/pppp1ppp/4pn2/6B1/1bPP4/2N5/PP2PPPP/R2QKBNR b KQkq - 0 4",
        "name": "Nimzo-Indian Defence: Leningrad Variation"
      },
      {
        "eco": "E26",
        "fen": "rnbqk2r/pppp1ppp/4pn2/8/2PP4/P1P5/4PPPP/R1BQKBNR b KQkq - 0 5",
        "name": "Nimzo-Indian Defence: S\u00e4misch Variation"
      },
      {
        "eco": "A53",
        "fen": "rnbqkb1r/ppp1pppp/3p1n2/8/2PP4/8/PP2PPPP/RNBQKBNR w KQkq - 1 3",
        "name": "Old Indian Defence"
      },
      {
        "eco": "D06",
        "fen": "rnbqkbnr/ppp1pppp/8/3p4/2PP4/8/PP2PPPP/RNBQKBNR b KQkq c3 1 2",
        "name": "Queen's Gambit"
      },
      {
        "eco": "D20",
        "fen": "rnbqkbnr/ppp1pppp/8/8/2pP4/8/PP2PPPP/RNBQKBNR w KQkq - 1 3",
        "name": "Queen's Gambit Accepted"
      },
      {
        "eco": "D43",
        "fen": "rnbqkb1r/pp3ppp/2p1pn2/3p4/2PP4/2N2N2/PP2PPPP/R1BQKB1R w KQkq - 1 5",
        "name": "Queen's Gambit Declined: Semi-Slav Defence"
      },
      {
        "eco": "D10",
        "fen": "rnbqkbnr/pp2pppp/2p5/3p4/2PP4/8/PP2PPPP/RNBQKBNR w KQkq - 0 3",
        "name": "Queen's Gambit Declined: Slav Defence"
      },
      {
        "eco": "D40",
        "fen": "rnbqkb1r/pp3ppp/4pn2/2pp4/2PP4/2N2N2/PP2PPPP/R1BQKB1R w KQkq c6 1 5",
        "name": "Queen's Gambit Declined: Semi-Tarrasch Defence"
      },
      {
        "eco": "D32",
        "fen": "rnbqkbnr/pp3ppp/4p3/2pp4/2PP4/2N5/PP2PPPP/R1BQKBNR w KQkq - 0 4",
        "name": "Queen's Gambit Declined: Tarrasch Defence"
      },
      {
        "eco": "D08",
        "fen": "rnbqkbnr/ppp2ppp/8/3pp3/2PP4/8/PP2PPPP/RNBQKBNR w KQkq e6 1 3",
        "name": "Queen's Gambit Declined: Albin Countergambit"
      },
      {
        "eco": "D07",
        "fen": "r1bqkbnr/ppp1pppp/2n5/3p4/2PP4/8/PP2PPPP/RNBQKBNR w KQkq - 2 3",
        "name": "Queen's Gambit Declined: Chigorin Defence"
      },
      {
        "eco": "E12",
        "fen": "rnbqkb1r/p1pp1ppp/1p2pn2/8/2PP4/5N2/PP2PPPP/RNBQKB1R w KQkq - 1 4",
        "name": "Queen's Indian Defence"
      },
      {
        "eco": "D02",
        "fen": "rnbqkb1r/ppp1pppp/5n2/3p4/3P1B2/5N2/PPP1PPPP/RN1QKB1R b KQkq - 4 3",
        "name": "London System"
      },
      {
        "eco": "D03",
        "fen": "rnbqkb1r/ppp1pppp/5n2/3p2B1/3P4/5N2/PPP1PPPP/RN1QKB1R b KQkq - 4 3",
        "name": "Torre Attack"
      },
      {
        "eco": "D01",
        "fen": "rnbqkb1r/ppp1pppp/5n2/3p2B1/3P4/2N5/PPP1PPPP/R2QKBNR b KQkq - 4 3",
        "name": "Richter-Veresov Attack"
      },
      {
        "eco": "A52",
        "fen": "rnbqkb1r/pppp1ppp/5n2/4p3/2PP4/8/PP2PPPP/RNBQKBNR w KQkq - 0 3",
        "name": "Budapest Defence"
      },
      {
        "eco": "D00",
        "fen": "rnbqkbnr/ppp1pppp/8/3p4/3P4/8/PPP1PPPP/RNBQKBNR w KQkq - 0 2",
        "name": "Closed Game"
      },
      {
        "eco": "A45",
        "fen": "rnbqkb1r/pppppppp/5n2/6B1/3P4/8/PPP1PPPP/RN1QKBNR b KQkq - 3 2",
        "name": "Trompowsky Attack"
      }
    ]
  },
  {
    "name": "Nf3",
    "positions": [
      {
        "eco": "A04",
        "fen": "rnbqkbnr/pppppppp/8/8/8/5N2/PPPPPPPP/RNBQKB1R b KQkq - 1 1",
        "name": "Zukertort Opening"
      },
      {
        "eco": "A07",
        "fen": "rnbqkbnr/ppp1pppp/8/3p4/8/5NP1/PPPPPP1P/RNBQKB1R b KQkq - 1 2",
        "name": "King's Indian Attack"
      },
      {
        "eco": "A09",
        "fen": "rnbqkbnr/ppp1pppp/8/3p4/2P5/5N2/PP1PPPPP/RNBQKB1R b KQkq c3 1 2",
        "name": "R\u00e9ti Opening"
      }
    ]
  },
  {
    "name": "c4",
    "positions": [
      {
        "eco": "A10",
        "fen": "rnbqkbnr/pppppppp/8/8/2P5/8/PP1PPPPP/RNBQKBNR b KQkq c3 1 1",
        "name": "English Opening"
      },
      {
        "eco": "A20",
        "fen": "rnbqkbnr/pppp1ppp/8/4p3/2P5/8/PP1PPPPP/RNBQKBNR w KQkq e6 1 2",
        "name": "English Opening: Reversed Sicilian"
      },
      {
        "eco": "A30",
        "fen": "rnbqkbnr/pp1ppppp/8/2p5/2P5/8/PP1PPPPP/RNBQKBNR w KQkq c6 1 2",
        "name": "English Opening: Symmetrical Variation"
      },
      {
        "eco": "A26",
        "fen": "r1bqk1nr/ppp2pbp/2np2p1/4p3/2P5/2NP2P1/PP2PPBP/R1BQK1NR w KQkq - 0 6",
        "name": "English Opening: Closed System"
      }
    ]
  },
  {
    "name": "b3",
    "positions": [
      {
        "eco": "A01",
        "fen": "rnbqkbnr/pppppppp/8/8/8/1P6/P1PPPPPP/RNBQKBNR b KQkq - 1 1",
        "name": "Nimzo-Larsen Attack"
      }
    ]
  },
  {
    "name": "g3",
    "positions": [
      {
        "eco": "A00",
        "fen": "rnbqkbnr/pppppppp/8/8/8/6P1/PPPPPP1P/RNBQKBNR b KQkq - 1 1",
        "name": "Hungarian Opening"
      }
    ]
  }
]
