ECO tree

Every one of the 304 known lines laid out as a single branching tree. Click a labelled leaf to drill that line.

1. e4(12)
- 1… c5(7)
  - 2. Nf3(5)
    2… d6(3)
    3. Bb5+(2)
    3… Bd7(1)
    4. Bxd7+(1)
    4… Qxd7(1)
    5. O-O(1)
    5… Nc6B51Sicilian — Canal-Sokolsky
    3… Nd7(1)
    4. a4(1)
    4… Nf6(1)
    5. Nc3(1)
    5… a6B51Sicilian — Moscow
    3. Bd3(1)
    3… Nf6(1)
    4. c3(1)
    4… Nc6B50Sicilian — Kopec System
    3. d4(1)
    3… cxd4(1)
    4. Nxd4(1)
    4… Nf6(1)
    5. Nc3(4)
    5… a6(5)
    6. Be3(2)
    6… e6(1)
    7. f3(1)
    7… b5(1)
    8. Qd2(1)
    8… Nbd7B90Sicilian — Najdorf English Attack
    6… e5B90Sicilian — Najdorf
    6. Be2(1)
    6… e5(1)
    7. Nb3(1)
    7… Be7B92Sicilian — Najdorf 6.Be2
    6. Bg5(1)
    6… e6(1)
    7. f4(2)
    7… Be7B96Sicilian — Najdorf 6.Bg5
    7… Qb6B97Sicilian — Najdorf Poisoned Pawn
    6. g3(1)
    6… e5B90Sicilian — Najdorf Fianchetto
    6. h3B90Sicilian — Najdorf Adams Attack
    5… g6(3)
    6. Be2(1)
    6… Bg7(1)
    7. O-O(1)
    7… O-OB72Sicilian — Dragon Classical
    6. Be3(1)
    6… Bg7(1)
    7. f3(1)
    7… O-OB70Sicilian — Dragon
    8. Qd2(1)
    8… Nc6B77Sicilian — Yugoslav Attack
    6. f4(1)
    6… Bg7B71Sicilian — Dragon Levenfish
    5… Nc6(2)
    6. Bc4(1)
    6… e6(1)
    7. Be3(1)
    7… Be7(1)
    8. Qe2B89Sicilian — Velimirović Attack
    6. Bg5(1)
    6… e6B56Sicilian — Classical
    7. Qd2(1)
    7… a6B60Sicilian — Richter-Rauzer
    5… e6(1)
    6. Be2(1)
    6… Be7B80Sicilian — Scheveningen
    2… e6(2)
    3. c3(1)
    3… d5(1)
    4. exd5(1)
    4… Qxd5(1)
    5. d4(1)
    5… Nf6B40Sicilian — Delayed Alapin
    3. d4(1)
    3… cxd4(1)
    4. Nxd4(3)
    4… a6(1)
    5. Nc3(1)
    5… Qc7B41Sicilian — Kan
    4… Nc6(1)
    5. Nc3(3)
    5… a6(2)
    6. Be3(1)
    6… Nf6B46Sicilian — Paulsen
    6. Nxc6(1)
    6… bxc6B46Sicilian — Taimanov-Paulsen
    5… Nf6B45Sicilian — Four Knights
    5… Qc7B44Sicilian — Taimanov
    4… Nf6(1)
    5. Nc3(1)
    5… Bb4B40Sicilian — Pin Variation
    2… g6(2)
    3. c3(1)
    3… Bg7(1)
    4. d4(1)
    4… cxd4B20Sicilian — O'Connell Gambit
    3. d4(1)
    3… cxd4(1)
    4. Nxd4(2)
    4… Nc6(1)
    5. c4(1)
    5… Nf6(1)
    6. Nc3B36Sicilian — Maróczy Bind
    4… Bg7B27Sicilian — Hyper-Accelerated Dragon
    2… Nc6(2)
    3. Bb5(2)
    3… g6(1)
    4. O-O(1)
    4… Bg7(1)
    5. Re1(1)
    5… e5B30Sicilian — Rossolimo
    3… Nf6(1)
    4. Nc3(1)
    4… Nd4B30Sicilian — Rossolimo, 3...Nf6
    3. d4(1)
    3… cxd4(1)
    4. Nxd4(3)
    4… e5(1)
    5. Nb5(2)
    5… a6(1)
    6. Nd6+(1)
    6… Bxd6B32Sicilian — Löwenthal
    5… d6B32Sicilian — Kalashnikov
    4… g6(1)
    5. Nc3(1)
    5… Bg7(1)
    6. Be3(1)
    6… Nf6(1)
    7. Bc4(1)
    7… O-OB35Sicilian — Accelerated Dragon
    4… Nf6(1)
    5. Nc3(1)
    5… e5(1)
    6. Ndb5(1)
    6… d6B33Sicilian — Sveshnikov
    7. Bg5(1)
    7… a6(1)
    8. Na3(1)
    8… b5B33Sicilian — Sveshnikov Novosibirsk
    2… Nf6(1)
    3. e5(1)
    3… Nd5(1)
    4. Nc3(1)
    4… e6B29Sicilian — Nimzowitsch
  - 2. c3(2)
    2… d5(1)
    3. exd5(1)
    3… Qxd5(1)
    4. d4(1)
    4… Nf6(1)
    5. Nf3(1)
    5… Bg4B22Sicilian — Alapin
    2… Nf6(1)
    3. e5(1)
    3… Nd5(1)
    4. d4(1)
    4… cxd4(1)
    5. cxd4(1)
    5… d6B22Sicilian — Alapin 2...Nf6
  - 2. b3(1)
    2… d6(1)
    3. Bb2(1)
    3… Nf6(1)
    4. Nc3(1)
    4… Nc6B20Sicilian — Snyder / 2.b3
  - 2. b4(1)
    2… cxb4(1)
    3. a3(1)
    3… d5(1)
    4. exd5(1)
    4… Qxd5B20Sicilian — Wing Gambit
  - 2. d4(1)
    2… cxd4(1)
    3. c3(1)
    3… dxc3(1)
    4. Nxc3(1)
    4… Nc6(1)
    5. Nf3(1)
    5… e6B21Sicilian — Smith-Morra Gambit
  - 2. f4(1)
    2… d6(1)
    3. Nf3(1)
    3… Nc6(1)
    4. Bc4(1)
    4… e6B21Sicilian — McDonnell Attack
  - 2. Nc3(1)
    2… Nc6(2)
    3. f4(1)
    3… g6(1)
    4. Nf3(1)
    4… Bg7(1)
    5. Bc4(1)
    5… e6B23Sicilian — Grand Prix Attack
    3. g3(1)
    3… g6(1)
    4. Bg2(1)
    4… Bg7(1)
    5. d3(1)
    5… d6B25Sicilian — Closed
    6. f4(1)
    6… e6B25Sicilian — Closed Chameleon
- 1… e5(4)
  - 2. Nf3(5)
    2… Nc6(4)
    3. Bb5(6)
    3… a6(2)
    4. Ba4(2)
    4… Nf6(3)
    5. O-O(3)
    5… b5(1)
    6. Bb3(1)
    6… Bb7C78Ruy Lopez — Arkhangelsk
    5… Be7(1)
    6. Re1(2)
    6… b5(1)
    7. Bb3(2)
    7… d6(1)
    8. c3(1)
    8… O-OC78Ruy Lopez — Morphy Defense
    9. h3(4)
    9… Bb7(1)
    10. d4(1)
    10… Re8C92Ruy Lopez — Closed Zaitsev
    9… Na5(1)
    10. Bc2(1)
    10… c5C97Ruy Lopez — Closed Chigorin
    9… h6C93Ruy Lopez — Smyslov Defense
    9… Nb8C95Ruy Lopez — Closed Breyer
    7… O-O(1)
    8. c3(1)
    8… d5C89Ruy Lopez — Marshall Attack
    6… d6C78Ruy Lopez — Russian
    5… Nxe4(1)
    6. d4(2)
    6… b5(1)
    7. Bb3(1)
    7… d5C80Ruy Lopez — Open Variation
    8. dxe5(1)
    8… Be6(1)
    9. c3(1)
    9… Bc5C83Ruy Lopez — Dilworth Variation
    6… Nd6C80Ruy Lopez — Mecking Variation
    5. Bxc6(1)
    5… dxc6(2)
    6. d3(1)
    6… Bd6C85Ruy Lopez — Delayed Exchange
    6. Nc3(1)
    6… Bd6C85Ruy Lopez — Exchange Deferred
    5. d3(1)
    5… Be7(1)
    6. c3(1)
    6… O-OC77Ruy Lopez — Anderssen Variation
    4… d6(1)
    5. c3(1)
    5… Bd7(1)
    6. d4(1)
    6… Nf6C79Ruy Lopez — Steinitz Deferred
    4. Bxc6(1)
    4… dxc6(1)
    5. O-O(1)
    5… f6(1)
    6. d4(1)
    6… exd4C68Ruy Lopez — Exchange Variation
    3… f5(2)
    4. d4(1)
    4… exd4C63Ruy Lopez — Jaenisch Gambit
    4. Nc3(1)
    4… fxe4(1)
    5. Nxe4C63Ruy Lopez — Schliemann Defense
    3… Bc5(1)
    4. O-O(1)
    4… Nf6(1)
    5. c3(1)
    5… O-OC64Ruy Lopez — Classical Defense
    3… Nd4(1)
    4. Nxd4(1)
    4… exd4C61Ruy Lopez — Bird Defense
    3… Nf6(1)
    4. O-O(1)
    4… Nxe4(1)
    5. d4(1)
    5… Nd6(1)
    6. Bxc6(1)
    6… dxc6C65Ruy Lopez — Berlin Defense
    3… Nge7(1)
    4. c3(1)
    4… Ng6(1)
    5. d4(1)
    5… exd4C60Ruy Lopez — Cozio Defense
    3. Bc4(2)
    3… Bc5(3)
    4. b4(1)
    4… Bxb4(1)
    5. c3(1)
    5… Ba5(1)
    6. d4C51Italian Game — Evans Gambit
    6… exd4(1)
    7. O-O(1)
    7… Nge7C52Evans Gambit Accepted — Main
    4. c3(1)
    4… Nf6(2)
    5. d3(2)
    5… O-O(1)
    6. O-O(1)
    6… d6(1)
    7. Re1(1)
    7… a6(1)
    8. h3(1)
    8… Ba7C54Italian — Modern Giuoco Piano
    5… d6C50Italian Game — Main Line
    5. d4(1)
    5… exd4(2)
    6. cxd4(1)
    6… Bb4+C53Italian — Classical Giuoco Piano
    6. e5(1)
    6… Ng4C54Italian — McConnell Attack
    4. d3(1)
    4… Nf6(1)
    5. c3(1)
    5… d6(1)
    6. O-O(1)
    6… O-O(1)
    7. Re1C50Italian — Giuoco Pianissimo
    3… Nf6(2)
    4. Nc3(1)
    4… Bc5(1)
    5. d3(1)
    5… d6C50Italian — Four Knights
    4. Ng5(1)
    4… d5(1)
    5. exd5(2)
    5… Nxd5(1)
    6. Nxf7C57Two Knights — Fried Liver Attack
    5… Na5C55Two Knights Defense
    3. d4(1)
    3… exd4(3)
    4. Nxd4(3)
    4… Nf6(2)
    5. Nc3(1)
    5… Bb4(1)
    6. Nxc6(1)
    6… bxc6C47Scotch Four Knights
    5. Nxc6(1)
    5… bxc6(1)
    6. e5(1)
    6… Qe7C45Scotch — Schmidt Variation
    7. Qe2(1)
    7… Nd5C45Scotch — Mieses Variation
    4… Bc5(1)
    5. Be3(1)
    5… Qf6(1)
    6. c3(1)
    6… Nge7C45Scotch Game — Main Line
    4… Qh4C45Scotch — Steinitz
    4. Bc4(1)
    4… Bc5C44Scotch Gambit
    4. c3(1)
    4… dxc3C44Scotch — Göring Gambit
    3. Nc3(1)
    3… Nf6(3)
    4. Bb5(1)
    4… Bb4(1)
    5. O-O(1)
    5… O-OC48Four Knights — Spanish Variation
    6. d3(1)
    6… d6C49Four Knights — Double Spanish
    4. Bc4(1)
    4… Bc5(1)
    5. d3(1)
    5… O-OC48Four Knights — Italian Variation
    4. d4(1)
    4… exd4(1)
    5. Nxd4C47Four Knights — Scotch Variation
    2… Nf6(3)
    3. Nxe5(2)
    3… d6(2)
    4. Nf3(1)
    4… Nxe4(1)
    5. d4(1)
    5… d5(1)
    6. Bd3(1)
    6… Nc6C42Petrov — Classical
    4. Nxf7(1)
    4… Kxf7C42Petrov — Cochrane Gambit
    3… Nxe4C42Petrov — Nimzowitsch
    3. d4(1)
    3… exd4(1)
    4. e5(1)
    4… Ne4(1)
    5. Qxd4(1)
    5… d5C43Petrov — Steinitz Attack
    3. Nc3(1)
    3… Nc6(1)
    4. Bb5C42Petrov — Three Knights
    2… d5(1)
    3. exd5(1)
    3… e4C40Elephant Gambit
    2… d6(1)
    3. d4(3)
    3… exd4(1)
    4. Nxd4(1)
    4… Nf6C41Philidor — Exchange
    3… Nd7(1)
    4. Bc4(1)
    4… c6(1)
    5. O-O(1)
    5… Be7C41Philidor — Hanham
    3… Nf6(1)
    4. Nc3(1)
    4… Nbd7(1)
    5. Bc4(1)
    5… Be7C41Philidor — Main Line
    2… f5(1)
    3. Nxe5(1)
    3… Qf6C40Latvian Gambit
  - 2. f4(2)
    2… exf4(2)
    3. Nf3(4)
    3… g5(2)
    4. Bc4(1)
    4… g4(2)
    5. Ne5(1)
    5… Qh4+C37King's Gambit — Salvio
    5. O-O(1)
    5… gxf3(1)
    6. Qxf3C37King's Gambit — Muzio Gambit
    4. h4(1)
    4… g4(2)
    5. Ne5(1)
    5… Nf6C39King's Gambit — Kieseritzky
    5. Ng5(1)
    5… h6(1)
    6. Nxf7(1)
    6… Kxf7C39King's Gambit — Allgaier
    3… Be7(1)
    4. Bc4(1)
    4… Nf6C35King's Gambit — Cunningham
    3… d5(1)
    4. exd5C33King's Gambit Accepted
    3… d6(1)
    4. d4(1)
    4… g5C34King's Gambit — Fischer Defense
    3. Bc4(1)
    3… d5(1)
    4. Bxd5(1)
    4… Nf6C33King's Gambit — Bishop's Gambit
    2… Bc5(1)
    3. Nf3(1)
    3… d6C30King's Gambit Declined
  - 2. Nc3(2)
    2… Nc6(2)
    3. f4(1)
    3… exf4(2)
    4. Nf3(1)
    4… g5C25Vienna Gambit
    4. d4C25Vienna — Steinitz Gambit
    3. g3(1)
    3… Bc5(1)
    4. Bg2(1)
    4… d6C25Vienna — Paulsen
    2… Nf6(2)
    3. Bc4(1)
    3… Nxe4(1)
    4. Qh5C26Vienna Game
    3. g3(1)
    3… Bc5(1)
    4. Bg2(1)
    4… Nc6(1)
    5. Nge2C26Vienna — Falkbeer
  - 2. Bc4(1)
    2… Nf6(1)
    3. d3(1)
    3… Bc5(1)
    4. Nf3(1)
    4… d6C23Bishop's Opening
- 1… c6(3)
  - 2. Bc4(1)
    2… d5(1)
    3. Bb3(1)
    3… dxe4B12Caro-Kann — Hillbilly Attack
  - 2. d4(1)
    2… d5(4)
    3. e5(1)
    3… Bf5(1)
    4. Nf3(1)
    4… e6(1)
    5. Be2(2)
    5… Ne7B12Caro-Kann — Advance, Short System
    6. O-O(1)
    6… Ng6B12Caro-Kann — Advance, Short System Deep
    5… c5B12Caro-Kann — Advance
    3. exd5(1)
    3… cxd5(2)
    4. Bd3(1)
    4… Nc6(1)
    5. c3(1)
    5… Nf6B13Caro-Kann — Exchange
    4. c4(1)
    4… Nf6(1)
    5. Nc3(1)
    5… e6B13Caro-Kann — Panov Attack
    6. Nf3(1)
    6… Be7B14Caro-Kann — Panov Endgame
    3. f3(1)
    3… e6(1)
    4. Nc3(1)
    4… Bb4B12Caro-Kann — Fantasy Variation
    3. Nc3(1)
    3… dxe4(1)
    4. Nxe4(3)
    4… Bf5(1)
    5. Ng3(1)
    5… Bg6(1)
    6. h4(1)
    6… h6B18Caro-Kann — Classical
    7. Nf3(1)
    7… Nd7(1)
    8. h5(1)
    8… Bh7B18Caro-Kann — Classical Deep
    4… Nd7(1)
    5. Nf3(1)
    5… Ngf6(1)
    6. Nxf6+(1)
    6… Nxf6B17Caro-Kann — Karpov Variation
    4… Nf6(1)
    5. Nxf6+(1)
    5… gxf6B16Caro-Kann — Bronstein-Larsen
  - 2. Nc3(1)
    2… d5(1)
    3. Nf3(1)
    3… Bg4(1)
    4. h3(1)
    4… Bxf3(1)
    5. Qxf3B10Caro-Kann — Two Knights
- 1… e6(3)
  - 2. d3(1)
    2… d5(1)
    3. Nd2(2)
    3… c5(2)
    4. g3(1)
    4… Nc6(1)
    5. Bg2(1)
    5… Nf6(1)
    6. Ngf3(1)
    6… Be7C00King's Indian Attack — French Setup
    4. Ngf3(1)
    4… Nc6(1)
    5. g3(1)
    5… Nf6(1)
    6. Bg2(1)
    6… Be7(1)
    7. O-O(1)
    7… O-OC00French — King's Indian Attack Universal
    3… Nf6(1)
    4. Ngf3(1)
    4… c5(1)
    5. g3(1)
    5… Nc6(1)
    6. Bg2(1)
    6… Be7C00French — King's Indian Attack
  - 2. d4(1)
    2… d5(4)
    3. Nc3(3)
    3… Nf6(2)
    4. Bg5(2)
    4… Bb4(1)
    5. e5(1)
    5… h6(1)
    6. Bd2(1)
    6… Bxc3C12French — MacCutcheon
    4… dxe4(1)
    5. Nxe4(1)
    5… Be7C11French — Burn Variation
    4. e5(1)
    4… Nfd7(1)
    5. f4(1)
    5… c5(1)
    6. Nf3(1)
    6… Nc6C11French — Classical
    7. Be3(1)
    7… a6C11French — Steinitz
    3… Bb4(1)
    4. e5(1)
    4… c5(1)
    5. a3(1)
    5… Bxc3+(1)
    6. bxc3C18French — Winawer
    6… Ne7(1)
    7. Qg4(1)
    7… Qc7C18French — Winawer Poisoned Pawn
    3… dxe4(1)
    4. Nxe4(2)
    4… Bd7(1)
    5. Nf3(1)
    5… Bc6C10French — Fort Knox
    4… Nd7(1)
    5. Nf3(1)
    5… Ngf6C10French — Rubinstein
    3. e5(1)
    3… c5(1)
    4. c3(1)
    4… Nc6(1)
    5. Nf3(1)
    5… Qb6C02French — Advance
    6. Be2(1)
    6… cxd4C02French — Advance Paulsen
    3. exd5(1)
    3… exd5(1)
    4. Nf3(1)
    4… Nf6(1)
    5. Bd3(1)
    5… Bd6C01French — Exchange
    3. Nd2(1)
    3… Nf6(1)
    4. e5(1)
    4… Nfd7(1)
    5. Bd3(1)
    5… c5C03French — Tarrasch
    6. c3(1)
    6… Nc6(1)
    7. Ne2(1)
    7… cxd4(1)
    8. cxd4(1)
    8… f6C06French — Tarrasch 3...Nf6 Main
  - 2. Qe2(1)
    2… c5(1)
    3. Nf3(1)
    3… Nc6(1)
    4. g3(1)
    4… d5C00French — Chigorin (2.Qe2)
- 1… Nf6(2)
  - 2. e5(1)
    2… Nd5(2)
    3. c4(1)
    3… Nb6(2)
    4. c5(1)
    4… Nd5B02Alekhine — Chase Variation
    4. f4(1)
    4… d6B02Alekhine — Two Pawns Attack
    3. d4(1)
    3… d6(2)
    4. Nf3(2)
    4… Bg4(1)
    5. Be2(1)
    5… e6(1)
    6. O-O(1)
    6… Be7B04Alekhine — Modern
    4… g6B04Alekhine — Main Line
    4. c4(1)
    4… Nb6(2)
    5. exd6(1)
    5… cxd6B03Alekhine — Exchange
    5. f4B03Alekhine — Four Pawns Attack
  - 2. Nc3(1)
    2… d5(1)
    3. e5(1)
    3… Nfd7(1)
    4. d4(1)
    4… c5B02Alekhine — Sämisch
- 1… a6(1)
  - 2. d4(1)
    2… b5(1)
    3. Bd3(1)
    3… Bb7B00Rare — St. George's Defense
- 1… b6(1)
  - 2. d4(1)
    2… Bb7(1)
    3. Bd3(1)
    3… e6(1)
    4. Nf3(1)
    4… Nf6B00Owen's Defense
- 1… d5(1)
  - 2. exd5(2)
    2… Nf6(2)
    3. d4(2)
    3… Nxd5(1)
    4. Nf3(1)
    4… Bg4B01Scandinavian — Modern
    3… Bg4B01Scandinavian — Portuguese Gambit
    3. c4(1)
    3… e6B01Scandinavian — Icelandic Gambit
    2… Qxd5(2)
    3. Nc3(3)
    3… Qa5(1)
    4. d4(1)
    4… Nf6(1)
    5. Nf3(1)
    5… c6B01Scandinavian — Main Line
    3… Qd6(1)
    4. d4(1)
    4… Nf6B01Scandinavian — 3...Qd6
    3… Qd8(1)
    4. d4(1)
    4… Nf6B01Scandinavian — Gubinsky-Melts
    3. Nf3(1)
    3… Bg4(1)
    4. Be2(1)
    4… Nc6B01Scandinavian — Mieses-Kotroc
- 1… d6(1)
  - 2. d4(1)
    2… Nf6(1)
    3. Nc3(2)
    3… g6(4)
    4. Be3(1)
    4… Bg7(1)
    5. f3(1)
    5… O-O(1)
    6. Qd2(1)
    6… c6B07Pirc — 150 Attack
    4. Bg5(1)
    4… Bg7(1)
    5. Qd2(1)
    5… c6B07Pirc — Byrne Variation
    4. f4(1)
    4… Bg7(1)
    5. Nf3(1)
    5… O-OB09Pirc — Austrian Attack
    4. Nf3(1)
    4… Bg7(2)
    5. Be2(1)
    5… O-OB07Pirc — Classical
    5. Bg5(1)
    5… O-OB08Pirc — Yugoslav Setup
    3… c6(1)
    4. Nf3(1)
    4… Bg4B07Pirc — Czech Defense
- 1… g5(1)
  - 2. d4(1)
    2… h6(1)
    3. h4(1)
    3… g4B00Rare — Borg Defense
- 1… g6(1)
  - 2. d4(1)
    2… Bg7(2)
    3. c4(1)
    3… d6(1)
    4. Nc3(1)
    4… e6(1)
    5. Nf3(1)
    5… Ne7B06Modern — Hippopotamus Defense
    3. Nc3(1)
    3… d6(1)
    4. Nf3(1)
    4… Nf6B06Modern Defense
- 1… Nc6(1)
  - 2. d4(1)
    2… d5(1)
    3. Nc3(1)
    3… dxe4(1)
    4. d5(1)
    4… Ne5B00Nimzowitsch Defense
1. d4(5)
- 1… Nf6(5)
  - 2. c4(5)
    2… e6(3)
    3. Nf3(2)
    3… b6(3)
    4. g3(2)
    4… Ba6(1)
    5. b3(1)
    5… Bb4+E15Queen's Indian — Classical
    4… Bb7(1)
    5. Bg2(3)
    5… Bb4+(1)
    6. Bd2(1)
    6… Bxd2+E16Queen's Indian — Capablanca
    5… Be7(1)
    6. O-O(1)
    6… O-OE15Queen's Indian — Fianchetto
    5… c5E12Queen's Indian — Pseudo-Catalan
    4. a3(1)
    4… Bb7(1)
    5. Nc3(1)
    5… d5E12Queen's Indian — Petrosian
    6. cxd5(1)
    6… Nxd5(1)
    7. Qc2E12Queen's Indian — Kasparov
    4. Nc3(1)
    4… Bb7(1)
    5. Bg5(1)
    5… Bb4E12Queen's Indian — Miles
    3… Bb4+(3)
    4. Bd2(2)
    4… Be7(1)
    5. g3(1)
    5… O-O(1)
    6. Bg2(1)
    6… d5E11Bogo-Indian — Bishop Retreat
    4… Qe7(1)
    5. g3(1)
    5… O-OE11Bogo-Indian — Main Line
    4. Nbd2(1)
    4… O-O(1)
    5. a3(1)
    5… Be7E11Bogo-Indian — Nimzowitsch
    4. Nc3(1)
    4… c5E11Bogo-Indian — Vitolins
    3. g3(1)
    3… d5(1)
    4. Bg2(2)
    4… Be7(1)
    5. Nf3(1)
    5… O-OE06Catalan — Closed
    6. O-O(2)
    6… dxc4(1)
    7. Qc2(1)
    7… a6E05Catalan — Open Main
    6… Nbd7(1)
    7. Qc2(1)
    7… c6E08Catalan — Closed Main Line
    4… dxc4(1)
    5. Nf3(2)
    5… a6(1)
    6. O-O(1)
    6… b5E04Catalan — Open Deferred
    5… c5E04Catalan — Open
    3. Nc3(1)
    3… Bb4(6)
    4. e3(2)
    4… c5(2)
    5. Bd3(1)
    5… Nc6(1)
    6. Nf3(1)
    6… Bxc3+E41Nimzo-Indian — Hübner
    5. Ne2E42Nimzo-Indian — Bronstein
    4… O-O(1)
    5. Bd3(1)
    5… d5E40Nimzo-Indian — Rubinstein
    6. Nf3(1)
    6… c5(1)
    7. O-O(1)
    7… dxc4(1)
    8. Bxc4E54Nimzo-Indian — Karpov
    4. a3(1)
    4… Bxc3+(1)
    5. bxc3(1)
    5… c5(1)
    6. e3(1)
    6… O-OE26Nimzo-Indian — Sämisch
    4. Bg5(1)
    4… h6(1)
    5. Bh4(1)
    5… c5E30Nimzo-Indian — Leningrad
    4. f3(1)
    4… d5E20Nimzo-Indian — Kmoch Variation
    4. g3(1)
    4… c5(1)
    5. Nf3(1)
    5… Ne4E20Nimzo-Indian — Romanishin
    4. Qc2(1)
    4… O-O(1)
    5. a3(1)
    5… Bxc3+(1)
    6. Qxc3E32Nimzo-Indian — Classical
    2… g6(3)
    3. Nc3(2)
    3… d5(4)
    4. Bf4(1)
    4… Bg7(1)
    5. e3(1)
    5… c5D81Grünfeld — 4.Bf4
    6. dxc5(1)
    6… Qa5D82Grünfeld — Classical
    4. Bg5(1)
    4… Ne4D80Grünfeld — 4.Bg5
    4. cxd5(1)
    4… Nxd5(2)
    5. e4(1)
    5… Nxc3(1)
    6. bxc3(1)
    6… Bg7D85Grünfeld — Exchange
    5. Nf3(1)
    5… Bg7(1)
    6. e4(1)
    6… Nxc3(1)
    7. bxc3(1)
    7… c5D85Grünfeld — Modern Exchange
    4. Nf3(1)
    4… Bg7(2)
    5. e3(1)
    5… O-O(1)
    6. Qb3(1)
    6… dxc4D94Grünfeld — Three Knights
    5. Qb3(1)
    5… dxc4(1)
    6. Qxc4(1)
    6… O-OD97Grünfeld — Russian System
    3… Bg7(2)
    4. e4(1)
    4… d6(4)
    5. Be2(1)
    5… O-O(1)
    6. Bg5(1)
    6… c5E73King's Indian — Averbakh
    5. f3(1)
    5… O-O(1)
    6. Be3E80King's Indian — Sämisch
    5. f4(1)
    5… O-O(1)
    6. Nf3(1)
    6… c5E76King's Indian — Four Pawns Attack
    5. Nf3(1)
    5… O-O(2)
    6. Be2(3)
    6… c5(1)
    7. d5(1)
    7… e6E76King's Indian — Benoni Wall
    6… e5E94King's Indian — Classical
    7. O-O(1)
    7… Nc6(1)
    8. d5(2)
    8… Ne7E97King's Indian — Mar del Plata
    9. b4E97King's Indian — Bayonet Attack
    8… Nb8E97King's Indian — Orthodox
    6… Nbd7E91King's Indian — Semi-Classical
    6. h3E90King's Indian — Makogonov
    4. Nf3(1)
    4… d6(1)
    5. g3(1)
    5… O-O(1)
    6. Bg2(1)
    6… Nbd7E62King's Indian — Fianchetto
    3. f3(1)
    3… d5(1)
    4. cxd5(1)
    4… Nxd5D78Grünfeld — 3.f3
    3. Nf3(1)
    3… Bg7(1)
    4. g3(1)
    4… d5(1)
    5. cxd5(1)
    5… Nxd5(1)
    6. Bg2(1)
    6… Nb6D76Grünfeld — Fianchetto
    2… c5(1)
    3. d5(3)
    3… b5(2)
    4. cxb5(1)
    4… a6(2)
    5. bxa6(1)
    5… Bxa6A58Benko Gambit — Accepted
    5. b6A57Benko — Fianchetto Declined
    4. Nf3(1)
    4… Bb7A57Benko Gambit — Declined
    3… e5(1)
    4. Nc3(1)
    4… d6A56Czech Benoni
    3… e6(1)
    4. Nc3(1)
    4… exd5(1)
    5. cxd5(1)
    5… d6(2)
    6. e4(1)
    6… g6(2)
    7. f4(1)
    7… Bg7A68Benoni — Four Pawns Attack
    7. Nf3(1)
    7… Bg7A70Benoni — Classical
    6. Nf3(1)
    6… g6A61Benoni — Modern
    7. g3(1)
    7… Bg7A62Benoni — Fianchetto
    2… d6(1)
    3. Nc3(2)
    3… e5(1)
    4. Nf3(1)
    4… Nbd7(1)
    5. e4(1)
    5… Be7A54Old Indian
    3… Nbd7(1)
    4. e4(1)
    4… e5(1)
    5. Nf3(1)
    5… c6A54Old Indian — Ukrainian
    2… e5(1)
    3. dxe5(1)
    3… Ng4(1)
    4. Nf3(1)
    4… Nc6A52Budapest Gambit
  - 2. Bg5(3)
    2… Ne4(2)
    3. Bf4(1)
    3… c5(1)
    4. f3(1)
    4… Qa5+A45Trompowsky — 3...Ne4 Main
    3. h4(1)
    3… c5(1)
    4. d5(1)
    4… Qb6A45Trompowsky — Raptor Variation
    2… c5(1)
    3. d5(1)
    3… Qb6(1)
    4. Bc1A45Trompowsky — Classical
    2… e6(1)
    3. e4(1)
    3… h6(1)
    4. Bxf6(1)
    4… Qxf6A45Trompowsky Attack
  - 2. Bf4(1)
    2… g6(1)
    3. e3(1)
    3… Bg7(1)
    4. h3(1)
    4… O-O(1)
    5. Nf3(1)
    5… d6D02London — Anti-KID
  - 2. Nc3(1)
    2… d5(1)
    3. Bf4(1)
    3… a6(1)
    4. e3(1)
    4… c5D00London — Jobava
  - 2. Nf3(1)
    2… e6(2)
    3. Bg5(2)
    3… c5(1)
    4. e3(1)
    4… Be7(1)
    5. Bxf6(1)
    5… Bxf6(1)
    6. c3A46Torre — London Hybrid
    3… h6(1)
    4. Bh4(1)
    4… b6(1)
    5. Nbd2(1)
    5… Bb7A46Torre Attack
    3. e3(1)
    3… c5(1)
    4. Bd3(1)
    4… d5(1)
    5. c3(1)
    5… Nc6(1)
    6. Nbd2(1)
    6… Bd6D05Colle — Phoenix Attack
- 1… d5(3)
  - 2. c4(7)
    2… c6(3)
    3. cxd5(1)
    3… cxd5(1)
    4. Nc3(1)
    4… Nf6(1)
    5. Nf3(1)
    5… Nc6D11Slav — Exchange
    3. Nc3(1)
    3… e5(1)
    4. dxe5(1)
    4… d4D10Slav — Winawer Counter-Gambit
    3. Nf3(1)
    3… Nf6(2)
    4. Nc3(3)
    4… e6(2)
    5. Bg5(1)
    5… h6D43Queen's Gambit — Semi-Slav
    5. e3(1)
    5… Nbd7(1)
    6. Bd3(1)
    6… dxc4D49Slav — Meran Variation
    4… a6(1)
    5. c5(1)
    5… Nbd7D15Slav — Chameleon
    4… dxc4(1)
    5. a4(1)
    5… Bf5D10Slav Defense
    4. e3(1)
    4… Bf5(1)
    5. Nc3(1)
    5… e6D12Slav — Schallopp Variation
    2… e6(3)
    3. Nc3(3)
    3… Nf6(3)
    4. Bg5(2)
    4… Be7(1)
    5. e3(1)
    5… O-O(1)
    6. Nf3(2)
    6… h6(1)
    7. Bh4(1)
    7… Ne4D56Queen's Gambit — Lasker Defense
    6… Nbd7(1)
    7. Rc1(1)
    7… c6D63Queen's Gambit — Orthodox
    4… Nbd7(1)
    5. Nf3(1)
    5… c6(1)
    6. e3(1)
    6… Qa5D52Queen's Gambit — Cambridge Springs
    4. cxd5(1)
    4… exd5(1)
    5. Bg5(1)
    5… Be7(1)
    6. e3(1)
    6… O-OD35Queen's Gambit Declined
    4. Nf3(1)
    4… c5(1)
    5. cxd5(1)
    5… Nxd5D41Queen's Gambit — Semi-Tarrasch
    3… a6(1)
    4. cxd5(1)
    4… exd5(1)
    5. Nf3(1)
    5… Nf6D31Queen's Gambit — Janowski
    3… c5(1)
    4. cxd5(1)
    4… exd5(1)
    5. Nf3(1)
    5… Nc6D32Queen's Gambit — Tarrasch
    3. cxd5(1)
    3… exd5(1)
    4. Nc3(1)
    4… Nf6(1)
    5. Bg5(1)
    5… c6(1)
    6. e3(1)
    6… Be7D35Queen's Gambit — Exchange Variation
    3. Nf3(1)
    3… Nf6(1)
    4. Nc3(1)
    4… Bb4(1)
    5. Bg5(2)
    5… h6(1)
    6. Bxf6(1)
    6… Qxf6D38Queen's Gambit — Ragozin
    5… dxc4D39Queen's Gambit — Vienna
    2… Bf5(1)
    3. Nc3(1)
    3… e6(1)
    4. Nf3(1)
    4… Nf6D02Baltic Defense
    2… dxc4(1)
    3. Nf3(1)
    3… Nf6(2)
    4. e3(1)
    4… e6(1)
    5. Bxc4(1)
    5… c5D20Queen's Gambit Accepted
    6. O-O(1)
    6… a6D27Queen's Gambit Accepted — Classical
    4. Nc3(1)
    4… a6(1)
    5. e4(1)
    5… b5D25Queen's Gambit Accepted — Three Knights
    2… e5(1)
    3. dxe5(1)
    3… d4(1)
    4. Nf3(1)
    4… Nc6D08Albin Counter-Gambit
    2… Nc6(1)
    3. Nf3(1)
    3… Bg4(1)
    4. Nc3(1)
    4… e6D07Chigorin Defense
    2… Nf6(1)
    3. cxd5(1)
    3… Nxd5(1)
    4. Nf3D06Queen's Gambit — Marshall Defense
  - 2. Bf4(1)
    2… Nf6(1)
    3. e3(1)
    3… c5(1)
    4. c3(1)
    4… Nc6(1)
    5. Nd2(1)
    5… e6D02London — Accelerated
  - 2. Nf3(1)
    2… Nf6(2)
    3. Bf4(1)
    3… c5(1)
    4. e3(1)
    4… Nc6(1)
    5. c3(1)
    5… Qb6D02London System
    3. e3(1)
    3… e6(2)
    4. b3(1)
    4… c5(1)
    5. Bb2(1)
    5… Nc6(1)
    6. Bd3D05Colle — Zukertort System
    4. Bd3(1)
    4… c5(1)
    5. c3(1)
    5… Nc6(1)
    6. Nbd2(1)
    6… Bd6D04Colle System
- 1… f5(3)
  - 2. Bg5(2)
    2… h6(1)
    3. Bh4(1)
    3… g5(1)
    4. Bg3(1)
    4… f4A80Dutch — Hopton Attack
    2… Nf6(1)
    3. Bxf6(1)
    3… exf6A80Dutch — Anti-Stonewall
  - 2. c4(1)
    2… Nf6(2)
    3. g3(2)
    3… e6(1)
    4. Bg2(2)
    4… Be7(1)
    5. Nf3(1)
    5… O-OA84Dutch — Classical
    4… d5(1)
    5. Nf3(1)
    5… c6A90Dutch — Stonewall
    3… g6(1)
    4. Bg2(1)
    4… Bg7(1)
    5. Nf3(1)
    5… O-OA88Dutch — Leningrad
    3. Nc3(2)
    3… d6(1)
    4. Nf3(1)
    4… e6(1)
    5. g3(1)
    5… Be7A85Dutch — Alekhine Variation
    3… e6(1)
    4. Nf3(1)
    4… Be7(1)
    5. g3(1)
    5… O-O(1)
    6. Bg2(1)
    6… d6A85Dutch — Ilyin-Zhenevsky
  - 2. e4(1)
    2… fxe4(1)
    3. Nc3(1)
    3… Nf6(1)
    4. Bg5(1)
    4… Nc6A82Dutch — Staunton Gambit
- 1… c5(1)
  - 2. d5(2)
    2… e5(1)
    3. e4(1)
    3… d6(1)
    4. Nc3(1)
    4… Nf6A43Old Benoni
    2… Nf6(1)
    3. Bg5A00Rare — Reversed Trompowsky
- 1… e5(1)
  - 2. dxe5(1)
    2… Nc6(1)
    3. Nf3(1)
    3… Qe7(1)
    4. Qd5(1)
    4… f6A40Englund Gambit
1. c4(3)
- 1… c5(2)
  - 2. Nc3(1)
    2… Nc6(2)
    3. g3(1)
    3… g6(1)
    4. Bg2(1)
    4… Bg7(2)
    5. e4(1)
    5… e6(1)
    6. Nge2(1)
    6… Nge7A36English — Botvinnik Setup
    5. Nf3(1)
    5… Nf6A34English — Symmetrical
    3. Nf3(1)
    3… Nf6(1)
    4. g3(1)
    4… g6(1)
    5. Bg2(1)
    5… Bg7(1)
    6. O-O(1)
    6… O-OA35English — Symmetrical Four Knights
  - 2. Nf3(1)
    2… Nf6(1)
    3. g3(1)
    3… b6(1)
    4. Bg2(1)
    4… Bb7(1)
    5. O-O(1)
    5… e6(1)
    6. Nc3(1)
    6… Be7A30English — Hedgehog
- 1… Nf6(2)
  - 2. Nc3(2)
    2… d5(1)
    3. cxd5(1)
    3… Nxd5(1)
    4. g3(1)
    4… g6(1)
    5. Bg2(1)
    5… Nxc3A16English — Anti-Grünfeld
    2… e6(1)
    3. e4(1)
    3… d5(1)
    4. e5(1)
    4… Ne4(1)
    5. Nf3(1)
    5… Nxc3A19English — Mikenas-Carls
  - 2. g3(1)
    2… g6(1)
    3. Bg2(1)
    3… Bg7(1)
    4. Nc3(1)
    4… O-O(1)
    5. e4(1)
    5… d6(1)
    6. Nge2A15English — Anglo-Indian
- 1… e5(1)
  - 2. Nc3(3)
    2… Bb4(1)
    3. Nd5(1)
    3… Be7A21English — King's English
    2… Nc6(1)
    3. g3(2)
    3… g6(1)
    4. Bg2(1)
    4… Bg7(2)
    5. d3(1)
    5… d6A25English — Closed
    5. e3(1)
    5… d6(1)
    6. Nge2(1)
    6… Nf6A26English — Botvinnik Flexible
    3… Bc5A27English — Three Knights
    2… Nf6(1)
    3. Nf3(1)
    3… Nc6(2)
    4. e3(1)
    4… Bb4A28English — Four Knights
    4. g3(1)
    4… Bb4A20English — Reversed Sicilian
1. b4(2)
- 1… d5(1)
  - 2. Bb2(1)
    2… Nf6(1)
    3. e3(1)
    3… Bf5A00Rare — Tartakower Defense
- 1… e5(1)
  - 2. Bb2(1)
    2… Bxb4(1)
    3. Bxe5(1)
    3… Nf6(1)
    4. c4(1)
    4… O-OA00Polish — Sokolsky
1. f4(2)
- 1… d5(1)
  - 2. Nf3(2)
    2… g6(1)
    3. g3(1)
    3… Bg7(1)
    4. Bg2(1)
    4… Nf6(1)
    5. O-O(1)
    5… O-OA03Bird — Leningrad Setup
    2… Nf6(1)
    3. e3(2)
    3… e6(1)
    4. b3(1)
    4… Be7(1)
    5. Bb2(1)
    5… O-OA03Bird — Classical
    3… g6(1)
    4. b3(1)
    4… Bg7A02Bird's Opening
- 1… e5(1)
  - 2. fxe5(1)
    2… d6(1)
    3. exd6(1)
    3… Bxd6(1)
    4. Nf3(1)
    4… g5A02Bird — From's Gambit
1. Nf3(2)
- 1… d5(3)
  - 2. g3(2)
    2… c6(1)
    3. Bg2(1)
    3… Nf6(1)
    4. O-O(1)
    4… Bf5(1)
    5. c4(1)
    5… e6A06Réti — Catalan Setup
    2… Nf6(1)
    3. Bg2(2)
    3… c6(1)
    4. O-O(1)
    4… Bg4(1)
    5. d3(1)
    5… Nbd7(1)
    6. Nbd2(1)
    6… e5A06Réti — Barcza System
    3… e6(1)
    4. O-O(1)
    4… Be7(1)
    5. d3(1)
    5… O-OA07Réti — King's Indian Attack
    6. Nbd2(1)
    6… c5A07King's Indian Attack — Main Line
  - 2. b3(1)
    2… Nf6(1)
    3. Bb2(1)
    3… e6(1)
    4. e3(1)
    4… Be7(1)
    5. c4(1)
    5… O-OA04Réti — Zukertort Setup
  - 2. c4(1)
    2… d4(1)
    3. b4(1)
    3… c5(1)
    4. b5A09Réti Opening — Main Line
- 1… Nf6(1)
  - 2. g3(1)
    2… g6(1)
    3. Bg2(1)
    3… Bg7(2)
    4. d3(1)
    4… d6(1)
    5. O-O(1)
    5… O-O(1)
    6. e4(1)
    6… e5(1)
    7. Nbd2(1)
    7… Nbd7A07KIA — Reversed King's Indian
    4. O-O(1)
    4… O-O(1)
    5. d3(1)
    5… d6(1)
    6. c4(1)
    6… e5A05Réti — King's Side
1. a3(1)
- 1… e5(1)
  - 2. c4(1)
    2… Nf6(1)
    3. Nc3(1)
    3… d5A00Rare — Anderssen Opening
1. g4(1)
- 1… d5(1)
  - 2. Bg2(1)
    2… c6(1)
    3. h3(1)
    3… e5A00Rare — Grob's Attack
1. Nh3(1)
- 1… d5(1)
  - 2. g3(1)
    2… e5(1)
    3. f4(1)
    3… Bxh3A00Rare — Amar Opening