ecocodes
Volume A · Flank openings‹ A39A41 ›
a1b2c3d4e5f6g7h8
Reference position · Black to move

A40 Queen’s Pawn Game

Also filed here: Englund Gambit, English Defense, Pterodactyl Defense, Mikenas Defense, Colle System, Horwitz Defense and nine more.

A40 holds 52 named lines from 16 openings, most of them (16) under Englund Gambit. Its reference line is a single first move, played from the initial position. Lines of 262 other codes continue from its position, the widest spread of all 500 codes. Material is no longer level at the end of 12 of its lines; the widest gap, one pawn in White’s favour, comes in English Defense: Hartlaub Gambit Accepted. Black, to move in that position, has 20 legal moves, the fewest of the 7 Queen’s Pawn Game codes.

Score sheet
#WhiteBlack
1d4

What each move does

  1. 1.d4 The d-pawn advances two squares to d4, covering c5 and e5, opening a line for the bishop on c1 and the queen on d1.

Lines filed under A40

They begin with two different first moves.

NameAfter the shared startPliesAt the end
Queen’s Pawn Game1.d41
Australian Defense1.d4 Na62
Borg Defense: Borg Gambit1.d4 g52
English Defense1.d4 b62
Englund Gambit1.d4 e52
Horwitz Defense1.d4 e62
Mikenas Defense1.d4 Nc62
Polish Defense1.d4 b52
Queen’s Pawn Game: Modern Defense1.d4 g62
Englund Gambit Declined1.d4 e5 2.d53
Englund Gambit Declined: Reversed Alekhine1.d4 e5 2.Nf33
Englund Gambit Declined: Reversed French1.d4 e5 2.e33
English Defense1.d4 e6 2.c4 b64
Englund Gambit Declined: Reversed Krebs1.d4 e5 2.Nf3 e44
Englund Gambit: Hartlaub-Charlick Gambit1.d4 e5 2.dxe5 d64White +1
Englund Gambit: Mosquito Gambit1.d4 e5 2.dxe5 Qh44White +1
Englund Gambit: Soller Gambit1.d4 e5 2.dxe5 f64White +1
Horwitz Defense: Zilbermints Gambit1.d4 e6 2.c4 e54
Kangaroo Defense1.d4 e6 2.c4 Bb4+4check
Montevideo Defense1.d4 Nc6 2.d5 Nb84
Queen’s Pawn Game: Anglo-Slav Opening1.d4 c6 2.c4 d64
Englund Gambit Declined: Reversed Brooklyn1.d4 e5 2.Nf3 e4 3.Ng15
Englund Gambit Declined: Reversed Mokele Mbembe1.d4 e5 2.Nf3 e4 3.Ne55
Kangaroo Defense: Keres Defense, Transpositional Variation1.d4 e6 2.c4 Bb4+ 3.Nc35
Modern Defense: Lizard Defense, Pirc-Diemer Gambit1.d4 g6 2.h4 Nf6 3.h55
Polish Defense: Spassky Gambit Accepted1.d4 b5 2.e4 Bb7 3.Bxb55White +1
English Defense: Eastbourne Gambit1.d4 b6 2.c4 Bb7 3.Nc3 e56
Englund Gambit Declined: Diemer Counterattack1.d4 e5 2.d5 Bc5 3.e4 Qh46
Englund Gambit: Felbecker Gambit1.d4 e5 2.dxe5 Nc6 3.Nf3 Bc56White +1
Englund Gambit: Main Line1.d4 e5 2.dxe5 Nc6 3.Nf3 Qe76White +1
Englund Gambit: Soller Gambit Deferred1.d4 e5 2.dxe5 Nc6 3.Nf3 f66White +1
Englund Gambit: Zilbermints Gambit1.d4 e5 2.dxe5 Nc6 3.Nf3 Nge76White +1
Mikenas Defense: Cannstatter Variation1.d4 Nc6 2.c4 e5 3.d5 Nd46
Mikenas Defense: Lithuanian Variation1.d4 Nc6 2.c4 e5 3.d5 Nce76
Slav Indian: Kudischewitsch Gambit1.d4 c6 2.Nf3 Nf6 3.c4 b56
Englund Gambit: Stockholm Variation1.d4 e5 2.dxe5 Nc6 3.Nf3 Qe7 4.Qd57White +1
Pterodactyl Defense: Queen Pterodactyl, Quiet Line1.d4 g6 2.c4 Bg7 3.Nc3 c5 4.e37
Colle System: Pterodactyl Variation1.d4 g6 2.Nf3 Bg7 3.e3 c5 4.Bd3 Qa5+8check
English Defense: Perrin Variation1.d4 e6 2.c4 b6 3.e4 Bb7 4.Bd3 Nc68
Mikenas Defense: Pozarek Gambit1.d4 Nc6 2.c4 e5 3.dxe5 Nxe5 4.Nc3 Nxc48Black +1
Pterodactyl Defense: Central, Benoni Pterodactyl1.d4 g6 2.c4 Bg7 3.e4 c5 4.d5 Qa5+8check
Pterodactyl Defense: Fianchetto, Queen Benoni Pterodactyl1.d4 g6 2.c4 Bg7 3.Nc3 c5 4.d5 Qa58
Pterodactyl Defense: Fianchetto, Queen Pterodactyl1.d4 g6 2.Nf3 Bg7 3.g3 c5 4.Bg2 Qa5+8check
Zaire Defense1.d4 Nc6 2.d5 Nb8 3.e4 Nf6 4.e5 Ng88
English Defense: Hartlaub Gambit Declined1.c4 e6 2.d4 b6 3.Nc3 Bb7 4.e4 f5 5.d59
Colle System: Siroccopteryx Variation1.d4 g6 2.Nf3 Bg7 3.e3 c5 4.Bd3 cxd4 5.Nxd4 Qa5+10check
English Defense: Hartlaub Gambit Accepted1.c4 e6 2.d4 b6 3.Nc3 Bb7 4.e4 f5 5.exf5 Nf610White +1
English Defense: Poli Gambit1.d4 e6 2.c4 b6 3.e4 Bb7 4.f3 f5 5.exf5 Nh610White +1
Modern Defense: Beefeater Variation1.d4 g6 2.c4 Bg7 3.Nc3 c5 4.d5 Bxc3+ 5.bxc3 f510
Pterodactyl Defense: Fianchetto, Queen Pteranodon1.d4 g6 2.c4 Bg7 3.Nc3 c5 4.d5 Bxc3+ 5.bxc3 Qa510
Pterodactyl Defense: Central, Benoni Beefeater Pterodactyl1.d4 g6 2.c4 Bg7 3.Nc3 c5 4.d5 d6 5.e4 Bxc3+ 6.bxc3 Qa512
Benoni Defense: Franco-Sicilian Hybrid1.d4 e6 2.c4 c5 3.d5 exd5 4.cxd5 d6 5.Nc3 g6 6.e4 Bg7 7.Nf3 Ne714

The position after 1.d4

WhiteBlackMaterial (pawn units)3939Minor pieces developed00Moves spent on pawns10Pawns on d4, e4, d5, e510Squares attacked in the other half40not castlednot castled

Codes that branch off from A40

The reference lines of five other codes leave A40 from the position after 1.d4, each with its own moves.

CodeMovesReference line
A411...d6Queen’s Pawn Game
A431...c5Benoni Defense: Old Benoni
A451...Nf6Indian Defense
A801...f5Dutch Defense
D001...d5Queen’s Pawn Game

Closest boards in other codes

CodeLineDiffers on
D20Queen’s Gambit Acceptedthree squares: c2, c4, d7
A00Van Geet Openingfour squares: b1, d2, c3, d4
A01Nimzo-Larsen Attackfour squares: b2, d2, b3, d4
A02Bird Openingfour squares: d2, f2, d4, f4
A04Zukertort Openingfour squares: g1, d2, f3, d4
A10English Openingfour squares: c2, d2, c4, d4
A46Indian Defense: Knights Variationfour squares: g1, f3, f6, g8

Where lines continue from here

Besides the codes above, they belong to A31, A42, A44, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A62, A63, A64, A65, A66, A67, A68, A69, A70, A71, A72, A73, A74, A75, A76, A77, A78, A79, A81, A82, A83, A84, A85, A86, A87, A88, A89, A90, A91, A92, A93, A94, A95, A96, A97, A98, A99, B06, C00, D01, D02, D03, D04, D05, D06, D07, D08, D09, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23, D24, D25, D26, D27, D28, D29, D30, D31, D32, D33, D34, D35, D36, D37, D38, D39, D40, D41, D42, D43, D44, D45, D46, D47, D48, D49, D50, D51, D52, D53, D54, D55, D56, D57, D58, D59, D60, D61, D62, D63, D64, D65, D66, D67, D68, D69, D70, D71, D72, D73, D74, D75, D76, D77, D78, D79, D80, D81, D82, D83, D84, D85, D86, D87, D88, D89, D90, D91, D92, D93, D94, D95, D96, D97, D98, D99, E00, E01, E02, E03, E04, E05, E06, E07, E08, E09, E10, E11, E12, E13, E14, E15, E16, E17, E18, E19, E20, E21, E22, E23, E24, E25, E26, E27, E28, E29, E30, E31, E32, E33, E34, E35, E36, E37, E38, E39, E40, E41, E42, E43, E44, E45, E46, E47, E48, E49, E50, E51, E52, E53, E54, E55, E56, E57, E58, E59, E60, E61, E62, E63, E64, E65, E66, E67, E68, E69, E70, E71, E72, E73, E74, E75, E76, E77, E78, E79, E80, E81, E82, E83, E84, E85, E86, E87, E88, E89, E90, E91, E92, E93, E94, E95, E96, E97, E98, E99.

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
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  31. 30
  32. 31
  33. 32
  34. 33
  35. 34
  36. 35
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  40. 39
  41. 40
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  44. 43
  45. 44
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  47. 46
  48. 47
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  54. 53
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  64. 63
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  91. 90
  92. 91
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  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
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  40. 39
  41. 40
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  53. 52
  54. 53
  55. 54
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  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
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  33. 32
  34. 33
  35. 34
  36. 35
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  40. 39
  41. 40
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  44. 43
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  91. 90
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  96. 95
  97. 96
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  99. 98
  100. 99

Volume D

  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
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  100. 99

Volume E

  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
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  29. 28
  30. 29
  31. 30
  32. 31
  33. 32
  34. 33
  35. 34
  36. 35
  37. 36
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  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
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  65. 64
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  91. 90
  92. 91
  93. 92
  94. 93
  95. 94
  96. 95
  97. 96
  98. 97
  99. 98
  100. 99

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