ecocodes

A Flank openings

Volume A spreads 823 named lines over its 100 codes, from 67 openings. Of these, 329 open with 1.d4, and after that the commonest replies are 1...Nf6 (174), 1...f5 (70), 1...c5 (19). The busiest code is A00 with 144 lines; 26 codes hold a single line. The deepest line in the volume, Benoni Defense: Fianchetto Variation, Hastings Defense, Main Line (A64), runs to 11...Re8.

The hundred codes of volume A

  1. A00Van Geet Opening
  2. A01Nimzo-Larsen Attack
  3. A02Bird Opening
  4. A03Bird Opening
  5. A04Zukertort Opening
  6. A05Zukertort Opening
  7. A06Zukertort Opening
  8. A07King’s Indian Attack
  9. A08King’s Indian Attack
  10. A09Réti Opening
  11. A10English Opening
  12. A11Réti Opening
  13. A12Réti Opening
  14. A13English Opening
  15. A14English Opening
  16. A15English Opening
  17. A16English Opening
  18. A17English Opening
  19. A18English Opening
  20. A19English Opening
  21. A20English Opening
  22. A21English Opening
  23. A22English Opening
  24. A23English Opening
  25. A24English Opening
  26. A25English Opening
  27. A26English Opening
  28. A27English Opening
  29. A28English Opening
  30. A29English Opening
  31. A30English Opening
  32. A31English Opening
  33. A32English Opening
  34. A33English Opening
  35. A34English Opening
  36. A35English Opening
  37. A36English Opening
  38. A37English Opening
  39. A38English Opening
  40. A39English Opening
  41. A40Englund Gambit
  42. A41Rat Defense
  43. A42Modern Defense
  44. A43Benoni Defense
  45. A44Benoni Defense
  46. A45Indian Defense
  47. A46Indian Defense
  48. A47Marienbad System
  49. A48London System
  50. A49Indian Defense
  51. A50Indian Defense
  52. A51Indian Defense
  53. A52Indian Defense
  54. A53Old Indian Defense
  55. A54Old Indian Defense
  56. A55Old Indian Defense
  57. A56Benoni Defense
  58. A57Benko Gambit
  59. A58Benko Gambit
  60. A59Benko Gambit
  61. A60Benoni Defense
  62. A61Benoni Defense
  63. A62Benoni Defense
  64. A63Benoni Defense
  65. A64Benoni Defense
  66. A65Benoni Defense
  67. A66Benoni Defense
  68. A67Benoni Defense
  69. A68Benoni Defense
  70. A69Benoni Defense
  71. A70Benoni Defense
  72. A71Benoni Defense
  73. A72Benoni Defense
  74. A73Benoni Defense
  75. A74Benoni Defense
  76. A75Benoni Defense
  77. A76Benoni Defense
  78. A77Benoni Defense
  79. A78Benoni Defense
  80. A79Benoni Defense
  81. A80Dutch Defense
  82. A81Dutch Defense
  83. A82Dutch Defense
  84. A83Dutch Defense
  85. A84Dutch Defense
  86. A85Dutch Defense
  87. A86Dutch Defense
  88. A87Dutch Defense
  89. A88Dutch Defense
  90. A89Dutch Defense
  91. A90Dutch Defense
  92. A91Dutch Defense
  93. A92Dutch Defense
  94. A93Dutch Defense
  95. A94Dutch Defense
  96. A95Dutch Defense
  97. A96Dutch Defense
  98. A97Dutch Defense
  99. A98Dutch Defense
  100. A99Dutch Defense

First moves

First moveLinesShare
1.d432940%
1.c419824%
1.Nf310313%
1.Nc3294%
1.b4273%
1.f4273%
1.g3213%
1.g4202%
1.b3152%
1.h491%
1.a471%
1.e361%
1.a351%
1.f351%
1.d351%
1.e451%
1.h340%
1.Na340%
1.Nh330%
1.c310%

Openings with most lines here

  1. English Opening 175
  2. Dutch Defense 69
  3. Benoni Defense 66
  4. Zukertort Opening 47
  5. Réti Opening 43
  6. Indian Defense 41
  7. Van Geet Opening 30
  8. Polish Opening 27
  9. Bird Opening 27
  10. King’s Indian Attack 27
  11. Benko Gambit 24
  12. Grob Opening 20
  13. Hungarian Opening 20
  14. Nimzo-Larsen Attack 18
  15. Englund Gambit 16
  16. Queen’s Pawn Game 16
  17. Old Indian Defense 14
  18. Modern Defense 11
  19. Trompowsky Attack 10
  20. Kádas Opening 9
  21. Pterodactyl Defense 8
  22. Ware Opening 7
  23. English Defense 7
  24. London System 7
  25. Torre Attack 6
  26. Barnes Opening 5
  27. Van’t Kruijs Opening 5
  28. Mieses Opening 4
  29. Sodium Attack 4
  30. Mikenas Defense 4

Every code in volume A

Each code’s reference line is its shortest named line; “Deepest” is the length in plies of its longest.

CodeReference lineMovesLinesDeepest
A00Van Geet Opening1.Nc314413
A01Nimzo-Larsen Attack1.b3156
A02Bird Opening1.f4199
A03Bird Opening: Dutch Variation1.f4 d589
A04Zukertort Opening1.Nf33110
A05Zukertort Opening1.Nf3 Nf61311
A06Zukertort Opening1.Nf3 d51310
A07King’s Indian Attack1.Nf3 d5 2.g31916
A08King’s Indian Attack: Sicilian Variation1.Nf3 d5 2.g3 c5 3.Bg2815
A09Réti Opening1.Nf3 d5 2.c497
A10English Opening1.c42016
A11English Opening: Caro-Kann Defensive System1.c4 c61212
A12Réti Opening: Anglo-Slav Variation, Bogoljubow Variation1.Nf3 d5 2.c4 c6 3.b32111
A13English Opening: Agincourt Defense1.c4 e61612
A14English Opening: Agincourt Defense, Neo-Catalan Declined1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 5.O-O1214
A15English Opening: Anglo-Indian Defense1.c4 Nf6158
A16English Opening: Anglo-Indian Defense, Queen’s Knight Variation1.c4 Nf6 2.Nc3712
A17English Opening: Anglo-Indian Defense, Hedgehog System1.c4 Nf6 2.Nc3 e6610
A18English Opening: Mikenas-Carls Variation1.c4 e6 2.Nc3 Nf6 3.e437
A19English Opening: Mikenas-Carls, Sicilian1.c4 e6 2.Nc3 Nf6 3.e4 c528
A20English Opening: King’s English Variation1.c4 e557
A21English Opening: King’s English Variation, Reversed Sicilian1.c4 e5 2.Nc368
A22English Opening: King’s English Variation, Two Knights Variation1.c4 e5 2.Nc3 Nf688
A23English Opening: King’s English Variation, Two Knights Variation, Keres Variation1.c4 e5 2.Nc3 Nf6 3.g3 c628
A24English Opening: King’s English Variation, Two Knights Variation, Fianchetto Line1.c4 e5 2.Nc3 Nf6 3.g3 g616
A25English Opening: King’s English Variation, Reversed Closed Sicilian1.c4 e5 2.Nc3 Nc61112
A26English Opening: King’s English Variation, Closed System, Full Symmetry1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6211
A27English Opening: King’s English Variation, Three Knights System1.c4 e5 2.Nc3 Nc6 3.Nf315
A28English Opening: King’s English Variation, Four Knights Variation1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6916
A29English Opening: King’s English Variation, Four Knights Variation, Fianchetto Line1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 4.g31414
A30English Opening: Symmetrical Variation1.c4 c5620
A31English Opening: Symmetrical Variation, Anti-Benoni Variation1.c4 Nf6 2.d4 c5 3.Nf3210
A32English Opening: Symmetrical Variation, Anti-Benoni Variation, Spielmann Defense1.c4 e6 2.d4 c5 3.Nf3 cxd4 4.Nxd4 Nf618
A33English Opening: Symmetrical Variation, Anti-Benoni Variation, Spielmann Defense1.c4 e6 2.Nf3 Nf6 3.Nc3 c5 4.d4 cxd4 5.Nxd4 Nc6212
A34English Opening: Symmetrical Variation, Normal Variation1.c4 c5 2.Nc3612
A35English Opening: Symmetrical Variation, Two Knights Variation1.c4 c5 2.Nc3 Nc648
A36English Opening: Symmetrical Variation, Two Knights, Fianchetto Variation1.c4 c5 2.Nc3 Nc6 3.g3410
A37English Opening: Symmetrical Variation, Three Knights, Fianchetto Variation1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3914
A38English Opening: Symmetrical Variation, Full Symmetry Line1.c4 Nf6 2.Nf3 c5 3.Nc3 Nc6 4.g3 g6 5.Bg2 Bg7313
A39English Opening: Symmetrical Variation, Mecking Variation1.c4 Nf6 2.Nf3 c5 3.Nc3 Nc6 4.g3 g6 5.Bg2 Bg7 6.O-O O-O 7.d4113
A40Queen’s Pawn Game1.d45214
A41Queen’s Pawn Game1.d4 d6118
A42Modern Defense: Averbakh System1.d4 g6 2.c4 Bg7 3.Nc3 d6 4.e4610
A43Benoni Defense: Old Benoni1.d4 c5206
A44Benoni Defense: Old Benoni1.d4 c5 2.d5 e526
A45Indian Defense1.d4 Nf63213
A46Indian Defense: Knights Variation1.d4 Nf6 2.Nf31510
A47Pseudo Queen’s Indian Defense1.d4 Nf6 2.Nf3 b6512
A48East Indian Defense1.d4 Nf6 2.Nf3 g61611
A49Indian Defense: Przepiorka Variation1.d4 Nf6 2.Nf3 g6 3.g315
A50Indian Defense: Normal Variation1.d4 Nf6 2.c477
A51Indian Defense: Budapest Gambit1.d4 Nf6 2.c4 e557
A52Indian Defense: Budapest Gambit Accepted, Main Line1.d4 Nf6 2.c4 e5 3.dxe5 Ng468
A53Old Indian Defense1.d4 Nf6 2.c4 d687
A54Old Indian Defense: Tartakower-Indian1.d4 Nf6 2.c4 d6 3.Nf3 Bg449
A55Old Indian Defense: Normal Variation1.d4 Nf6 2.c4 d6 3.Nc3 Nbd7 4.e4 e5 5.Nf319
A56Benoni Defense1.d4 Nf6 2.c4 c5716
A57Benko Gambit1.d4 Nf6 2.c4 c5 3.d5 b51515
A58Benko Gambit Accepted: Fully Accepted Variation1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6517
A59Benko Gambit Accepted: Yugoslav1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6 Bxa6 6.Nc3 d6 7.e4421
A60Benoni Defense: Modern Variation1.d4 Nf6 2.c4 c5 3.d5 e6210
A61Benoni Defense1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6413
A62Benoni Defense: Fianchetto Variation1.d4 Nf6 2.c4 e6 3.g3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.Bg2 Bg7 8.Nf3 O-O116
A63Benoni Defense: Fianchetto Variation, Hastings Defense1.d4 Nf6 2.c4 e6 3.g3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.Bg2 Bg7 8.Nf3 O-O 9.O-O Nbd7118
A64Benoni Defense: Fianchetto Variation, Hastings Defense, Main Line1.d4 Nf6 2.c4 e6 3.g3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.Bg2 Bg7 8.Nf3 O-O 9.O-O a6 10.a4 Nbd7 11.Nd2 Re8122
A65Benoni Defense: King’s Pawn Line1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4917
A66Benoni Defense: Pawn Storm Variation1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4215
A67Benoni Defense: Taimanov Variation1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4 Bg7 8.Bb5+115
A68Benoni Defense: Four Pawns Attack1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4 Bg7 8.Nf3 O-O217
A69Benoni Defense: Four Pawns Attack, Main Line1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4 Bg7 8.Nf3 O-O 9.Be2 Re8421
A70Benoni Defense: Classical Variation1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.e4315
A71Benoni Defense: Classical Variation, Averbakh-Grivas Attack1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.e4 Bg7 8.Bg5115
A72Benoni Defense: Classical Variation1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O116
A73Benoni Defense: Classical Variation, Main Line1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 9.O-O117
A74Benoni Defense: Classical Variation, Full Line1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 9.O-O a6 10.a4119
A75Benoni Defense: Classical Variation, Argentine Counterattack1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.e4 Bg7 8.Be2 O-O 9.O-O a6 10.a4 Bg4120
A76Benoni Defense: Classical Variation, Czerniak Defense1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 9.O-O Re8118
A77Benoni Defense: Classical Variation, Czerniak Defense, Tal Line1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 9.O-O Re8 10.Nd2220
A78Benoni Defense: Classical Variation, Czerniak Defense1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.e4 Bg7 8.Be2 O-O 9.O-O Re8 10.Nd2 Na6120
A79Benoni Defense: Classical Variation, Czerniak Defense1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 9.O-O Re8 10.Nd2 Na6 11.f3121
A80Dutch Defense1.d4 f5197
A81Dutch Defense: Fianchetto Attack1.d4 f5 2.g3510
A82Dutch Defense: Staunton Gambit1.d4 f5 2.e467
A83Dutch Defense: Staunton Gambit1.d4 f5 2.e4 fxe4 3.Nc3 Nf6 4.Bg559
A84Dutch Defense1.d4 f5 2.c478
A85Dutch Defense: Queen’s Knight Variation1.d4 f5 2.c4 Nf6 3.Nc315
A86Dutch Defense: Fianchetto Variation1.d4 f5 2.c4 Nf6 3.g3310
A87Dutch Defense: Leningrad Variation1.d4 f5 2.c4 Nf6 3.g3 g6 4.Bg2 Bg7 5.Nf319
A88Dutch Defense: Leningrad Variation, Warsaw Variation1.d4 f5 2.g3 Nf6 3.Bg2 g6 4.Nf3 Bg7 5.O-O O-O 6.c4 d6 7.Nc3 c6114
A89Dutch Defense: Leningrad Variation, Matulovic Variation1.d4 f5 2.g3 Nf6 3.Bg2 g6 4.Nf3 Bg7 5.O-O O-O 6.c4 d6 7.Nc3 Nc6114
A90Dutch Defense: Classical Variation1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2512
A91Dutch Defense: Classical Variation1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be729
A92Dutch Defense: Classical Variation1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O413
A93Dutch Defense: Stonewall Variation, Botvinnik Variation1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O d5 7.b3113
A94Dutch Defense: Stonewall Variation1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O d5 7.b3 c6 8.Ba3115
A95Dutch Defense: Stonewall Variation1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O d5 7.Nc3 c6217
A96Dutch Defense: Classical Variation1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O d6314
A97Dutch Defense: Classical Variation, Ilyin-Zhenevsky Variation1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O d6 7.Nc3 Qe8215
A98Dutch Defense: Classical Variation, Ilyin-Zhenevsky Variation, Alatortsev-Lisitsyn Line1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O d6 7.Nc3 Qe8 8.Qc2115
A99Dutch Defense: Classical Variation, Ilyin-Zhenevsky Variation, Modern Main Line1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O d6 7.Nc3 Qe8 8.b3115