ecocodes
Volume B · Semi-open gamesB01 ›
a1b2c3d4e5f6g7h8
Reference position · Black to move

B00 King’s Pawn Game

Also filed here: Nimzowitsch Defense, Owen Defense, Rat Defense, Borg Defense, Pirc Defense, St. George Defense and ten more.

B00 holds 83 named lines from 17 openings, most of them (43) under Nimzowitsch Defense. Its reference line is a single first move, played from the initial position. Lines of 203 other codes continue from its position, the second-widest spread of all 500 codes. With 83 named lines it is the second-largest code of all 500 codes. Material is no longer level at the end of 13 of its lines; the widest gap, one pawn in White’s favour, comes in Nimzowitsch Defense: Colorado Countergambit Accepted.

Score sheet
#WhiteBlack
1e4

What each move does

  1. 1.e4 The e-pawn advances two squares to e4, covering d5 and f5, opening a line for the queen on d1 and the bishop on f1.

Lines filed under B00

All 83 share their first one ply, the whole reference line and then split 12 ways at Black’s move 1.

NameAfter the shared startPliesAt the end
King’s Pawn Game(the shared start itself)1
Barnes Defense1...f62
Borg Defense1...g52
Carr Defense1...h62
Duras Gambit1...f52
Goldsmith Defense1...h52
Hippopotamus Defense1...Nh62
Lemming Defense1...Na62
Nimzowitsch Defense1...Nc62
Owen Defense1...b62
Pirc Defense1...d62
St. George Defense1...a62
Ware Defense1...a52
Nimzowitsch Defense1...Nc6 2.d43
Nimzowitsch Defense: Declined Variation1...Nc6 2.Nf33
Nimzowitsch Defense: Pseudo-Spanish Variation1...Nc6 2.Bb53
Nimzowitsch Defense: Wheeler Gambit1...Nc6 2.b43
Pirc Defense1...d6 2.d43
Rat Defense: Harmonist1...d6 2.f43
Rat Defense: Petruccioli Attack1...d6 2.h43
Rat Defense: Spike Attack1...d6 2.g43
Borg Defense: Borg Gambit1...g5 2.d4 Bg74
Borg Defense: Zilbermints Gambit1...g5 2.d4 e54
Carr Defense: Zilbermints Gambit1...h6 2.d4 e54
Fried Fox Defense1...f6 2.d4 Kf74
Goldsmith Defense: Picklepuss Defense1...h5 2.d4 Nf64
Nimzowitsch Defense: Colorado Countergambit1...Nc6 2.Nf3 f54
Nimzowitsch Defense: Franco-Nimzowitsch Variation1...Nc6 2.Nf3 e64
Nimzowitsch Defense: French Connection1...Nc6 2.Nc3 e64
Nimzowitsch Defense: Kennedy Variation1...Nc6 2.d4 e54
Nimzowitsch Defense: Mikenas Variation1...Nc6 2.d4 d64
Nimzowitsch Defense: Neo-Mongoloid Defense1...Nc6 2.d4 f64
Nimzowitsch Defense: Pirc Connection1...Nc6 2.Nc3 g64
Nimzowitsch Defense: Scandinavian Variation1...Nc6 2.d4 d54
Nimzowitsch Defense: Williams Variation1...Nc6 2.Nf3 d64
Nimzowitsch Defense: Woodchuck Variation1...Nc6 2.d4 a64
Owen Defense: Guatemala Defense1...b6 2.d4 Ba64
Pirc Defense1...d6 2.d4 Nf64
Rat Defense: Antal Defense1...d6 2.d4 Nd74
St. George Defense: Zilbermints Gambit1...a6 2.d4 e54
Ware Defense: Snagglepuss Defense1...a5 2.d4 Nc64
Lion Defense: Lion’s Jaw1...d6 2.d4 Nf6 3.f35
Nimzowitsch Defense: Colorado Countergambit Accepted1...Nc6 2.Nf3 f5 3.exf55White +1
Nimzowitsch Defense: Hornung Gambit1...Nc6 2.d4 d5 3.Be35
Nimzowitsch Defense: Kennedy Variation, Linksspringer Variation1...Nc6 2.d4 e5 3.d55
Nimzowitsch Defense: Scandinavian Variation, Advance Variation1...Nc6 2.d4 d5 3.e55
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation1...Nc6 2.d4 d5 3.Nc35
Owen Defense: Naselwaus Gambit1...b6 2.d4 Bb7 3.Bg55
Owen Defense: Smith Gambit1...b6 2.d4 Bb7 3.Nf35
Pirc Defense: Roscher Gambit1...d6 2.d4 Nf6 3.Nf35
Borg Defense: Troon Gambit1...g5 2.d4 h6 3.h4 g46
Hippopotamus Defense1...Nh6 2.d4 g6 3.c4 f66
Nimzowitsch Defense: Breyer Variation1...Nc6 2.Nc3 Nf6 3.d4 e56
Nimzowitsch Defense: El Columpio Defense1...Nc6 2.Nf3 Nf6 3.e5 Ng46
Nimzowitsch Defense: Kennedy Variation, Bielefelder Gambit1...Nc6 2.d4 e5 3.dxe5 Bc56White +1
Nimzowitsch Defense: Kennedy Variation, Hammer Gambit1...Nc6 2.d4 e5 3.dxe5 f66White +1
Nimzowitsch Defense: Kennedy Variation, Herford Gambit1...Nc6 2.d4 e5 3.dxe5 Qh46White +1
Nimzowitsch Defense: Kennedy Variation, de Smet Gambit1...Nc6 2.d4 e5 3.dxe5 d66White +1
Nimzowitsch Defense: Scandinavian Variation, Aachen Gambit1...Nc6 2.d4 d5 3.exd5 Nb46White +1
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation1...Nc6 2.d4 d5 3.Nc3 dxe46Black +1
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Brandics Gambit1...Nc6 2.d4 d5 3.Nc3 a66
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Erben Gambit1...Nc6 2.d4 d5 3.Nc3 g66
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Heinola-Deppe Gambit1...Nc6 2.d4 d5 3.Nc3 e56
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Vehre Variation1...Nc6 2.d4 d5 3.Nc3 Nf66
Nimzowitsch Defense: Scandinavian Variation, Exchange Variation1...Nc6 2.d4 d5 3.exd5 Qxd56
Owen Defense: Hekili-Loa Gambit1...b6 2.d4 c5 3.dxc5 Nc66White +1
Owen Defense: Unicorn Variation1...f6 2.d4 b6 3.c4 Bb76
Owen Defense: Wind Gambit1...b6 2.d4 Bb7 3.f3 e56
Rat Defense: Fuller Gambit1...d6 2.f4 d5 3.exd5 Nf66White +1
Nimzowitsch Defense: Kennedy Variation, Keres Attack1...Nc6 2.d4 e5 3.dxe5 Nxe5 4.Nc37
Nimzowitsch Defense: Kennedy Variation, Paulsen Attack1...Nc6 2.d4 e5 3.dxe5 Nxe5 4.Nf37
Nimzowitsch Defense: Scandinavian Variation, Exchange Variation, Marshall Gambit1...Nc6 2.d4 d5 3.exd5 Qxd5 4.Nc37
Van Geet Opening: Berlin Gambit1...Nc6 2.d4 d5 3.Nc3 dxe4 4.d57Black +1
Nimzowitsch Defense: Kennedy Variation, Main Line1...Nc6 2.d4 e5 3.dxe5 Nxe5 4.f4 Ng68
Nimzowitsch Defense: Kennedy Variation, Riemann Defense1...Nc6 2.d4 e5 3.dxe5 Nxe5 4.f4 Nc68
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Nimzowitsch Gambit1...Nc6 2.d4 d5 3.Nc3 dxe4 4.d5 Ne58Black +1
St. George Defense: Polish Variation1...a6 2.d4 b5 3.Nf3 Bb7 4.Bd3 e68
Nimzowitsch Defense: Scandinavian Variation, Bogoljubow Variation, Richter Gambit1...Nc6 2.d4 d5 3.Nc3 dxe4 4.d5 Nb8 5.f39Black +1
Owen Defense: Matovinsky Gambit1...b6 2.d4 Bb7 3.Bd3 f5 4.exf5 Bxg2 5.Qh5+ g610
Nimzowitsch Defense: El Columpio Defense, El Columpio Gambit1...Nc6 2.Nf3 Nf6 3.e5 Ng4 4.d4 d6 5.h3 Nh6 6.e611
Nimzowitsch Defense: El Columpio Defense, Exchange Variation1...Nc6 2.Nf3 Nf6 3.e5 Ng4 4.d4 d6 5.h3 Nh6 6.exd611White +1
Nimzowitsch Defense: El Columpio Defense, Pin Variation1...Nc6 2.Nf3 Nf6 3.e5 Ng4 4.d4 d6 5.h3 Nh6 6.Bb511
St. George Defense: San Jorge Variation1...a6 2.d4 b5 3.Nf3 Bb7 4.Bd3 d6 5.O-O g6 6.c3 Bg712White castled

The position after 1.e4

Black is to move and has 20 legal moves.

WhiteBlackMaterial (pawn units)3939Minor pieces developed00Moves spent on pawns10Pawns on d4, e4, d5, e510Squares attacked in the other half50not castlednot castled

Codes that branch off from B00

The reference lines of eight other codes leave B00 from two of its named positions; “From” gives the last part of that position’s name.

CodeFromMovesReference line
B01King’s Pawn Game1...d5Scandinavian Defense
B02King’s Pawn Game1...Nf6Alekhine Defense
B06King’s Pawn Game1...g6Modern Defense
B07Pirc Defense2...e5King’s Pawn Game: Maróczy Defense
B10King’s Pawn Game1...c6Caro-Kann Defense
B20King’s Pawn Game1...c5Sicilian Defense
C00King’s Pawn Game1...e6French Defense
C20King’s Pawn Game1...e5King’s Pawn Game

Closest boards in other codes

CodeLineDiffers on
C21Center Game Acceptedthree squares: d2, d4, e7
C33King’s Gambit Acceptedthree squares: f2, f4, e7
A00Van Geet Openingfour squares: b1, e2, c3, e4
A01Nimzo-Larsen Attackfour squares: b2, e2, b3, e4
A02Bird Openingfour squares: e2, f2, e4, f4
A04Zukertort Openingfour squares: g1, e2, f3, e4
A10English Openingfour squares: c2, e2, c4, e4

Where lines continue from here

Besides the codes above, they belong to A06, A08, A43, A82, B03, B04, B05, B08, B09, B11, B12, B13, B14, B15, B16, B17, B18, B19, B21, B22, B23, B24, B25, B26, B27, B28, B29, B30, B31, B32, B33, B34, B35, B36, B37, B38, B39, B40, B41, B42, B43, B44, B45, B46, B47, B48, B49, B50, B51, B52, B53, B54, B55, B56, B57, B58, B59, B60, B61, B62, B63, B64, B65, B66, B67, B68, B69, B70, B71, B72, B73, B74, B75, B76, B77, B78, B79, B80, B81, B82, B83, B84, B85, B86, B87, B88, B89, B90, B91, B92, B93, B94, B95, B96, B97, B98, B99, C01, C02, C03, C04, C05, C06, C07, C08, C09, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C21, C22, C23, C24, C25, C26, C27, C28, C29, C30, C31, C32, C33, C34, C35, C36, C37, C38, C39, C40, C41, C42, C43, C44, C45, C46, C47, C48, C49, C50, C51, C52, C53, C54, C55, C56, C57, C58, C59, C60, C61, C62, C63, C64, C65, C66, C67, C68, C69, C70, C71, C72, C73, C74, C75, C76, C77, C78, C79, C80, C81, C82, C83, C84, C85, C86, C87, C88, C89, C90, C91, C92, C93, C94, C95, C96, C97, C98, C99.

Volume A

  1. 00
  2. 01
  3. 02
  4. 03
  5. 04
  6. 05
  7. 06
  8. 07
  9. 08
  10. 09
  11. 10
  12. 11
  13. 12
  14. 13
  15. 14
  16. 15
  17. 16
  18. 17
  19. 18
  20. 19
  21. 20
  22. 21
  23. 22
  24. 23
  25. 24
  26. 25
  27. 26
  28. 27
  29. 28
  30. 29
  31. 30
  32. 31
  33. 32
  34. 33
  35. 34
  36. 35
  37. 36
  38. 37
  39. 38
  40. 39
  41. 40
  42. 41
  43. 42
  44. 43
  45. 44
  46. 45
  47. 46
  48. 47
  49. 48
  50. 49
  51. 50
  52. 51
  53. 52
  54. 53
  55. 54
  56. 55
  57. 56
  58. 57
  59. 58
  60. 59
  61. 60
  62. 61
  63. 62
  64. 63
  65. 64
  66. 65
  67. 66
  68. 67
  69. 68
  70. 69
  71. 70
  72. 71
  73. 72
  74. 73
  75. 74
  76. 75
  77. 76
  78. 77
  79. 78
  80. 79
  81. 80
  82. 81
  83. 82
  84. 83
  85. 84
  86. 85
  87. 86
  88. 87
  89. 88
  90. 89
  91. 90
  92. 91
  93. 92
  94. 93
  95. 94
  96. 95
  97. 96
  98. 97
  99. 98
  100. 99

Volume B

  1. 00
  2. 01
  3. 02
  4. 03
  5. 04
  6. 05
  7. 06
  8. 07
  9. 08
  10. 09
  11. 10
  12. 11
  13. 12
  14. 13
  15. 14
  16. 15
  17. 16
  18. 17
  19. 18
  20. 19
  21. 20
  22. 21
  23. 22
  24. 23
  25. 24
  26. 25
  27. 26
  28. 27
  29. 28
  30. 29
  31. 30
  32. 31
  33. 32
  34. 33
  35. 34
  36. 35
  37. 36
  38. 37
  39. 38
  40. 39
  41. 40
  42. 41
  43. 42
  44. 43
  45. 44
  46. 45
  47. 46
  48. 47
  49. 48
  50. 49
  51. 50
  52. 51
  53. 52
  54. 53
  55. 54
  56. 55
  57. 56
  58. 57
  59. 58
  60. 59
  61. 60
  62. 61
  63. 62
  64. 63
  65. 64
  66. 65
  67. 66
  68. 67
  69. 68
  70. 69
  71. 70
  72. 71
  73. 72
  74. 73
  75. 74
  76. 75
  77. 76
  78. 77
  79. 78
  80. 79
  81. 80
  82. 81
  83. 82
  84. 83
  85. 84
  86. 85
  87. 86
  88. 87
  89. 88
  90. 89
  91. 90
  92. 91
  93. 92
  94. 93
  95. 94
  96. 95
  97. 96
  98. 97
  99. 98
  100. 99

Volume C

  1. 00
  2. 01
  3. 02
  4. 03
  5. 04
  6. 05
  7. 06
  8. 07
  9. 08
  10. 09
  11. 10
  12. 11
  13. 12
  14. 13
  15. 14
  16. 15
  17. 16
  18. 17
  19. 18
  20. 19
  21. 20
  22. 21
  23. 22
  24. 23
  25. 24
  26. 25
  27. 26
  28. 27
  29. 28
  30. 29
  31. 30
  32. 31
  33. 32
  34. 33
  35. 34
  36. 35
  37. 36
  38. 37
  39. 38
  40. 39
  41. 40
  42. 41
  43. 42
  44. 43
  45. 44
  46. 45
  47. 46
  48. 47
  49. 48
  50. 49
  51. 50
  52. 51
  53. 52
  54. 53
  55. 54
  56. 55
  57. 56
  58. 57
  59. 58
  60. 59
  61. 60
  62. 61
  63. 62
  64. 63
  65. 64
  66. 65
  67. 66
  68. 67
  69. 68
  70. 69
  71. 70
  72. 71
  73. 72
  74. 73
  75. 74
  76. 75
  77. 76
  78. 77
  79. 78
  80. 79
  81. 80
  82. 81
  83. 82
  84. 83
  85. 84
  86. 85
  87. 86
  88. 87
  89. 88
  90. 89
  91. 90
  92. 91
  93. 92
  94. 93
  95. 94
  96. 95
  97. 96
  98. 97
  99. 98
  100. 99

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