ecocodes
Volume A · Flank openings‹ A01A03 ›
a1b2c3d4e5f6g7h8
Reference position · Black to move

A02 Bird Opening

A02 holds 19 named lines, all under the name Bird Opening. Its reference line is a single first move, played from the initial position. Material is no longer level at the end of eight of its lines; the widest gap, two pawns in White’s favour, comes in Bird Opening: From’s Gambit, Langheld Gambit. Lines filed under A00 reach one of its named positions by a different move order. Every line here opens 1.f4, a first move used by only 27 of the 3,865 lines in the list.

Score sheet
#WhiteBlack
1f4

What each move does

  1. 1.f4 The f-pawn advances two squares to f4, covering e5 and g5.

Lines filed under A02

All 19 share their first one ply, the whole reference line and then split seven ways at Black’s move 1.

NameAfter the shared startPliesAt the end
Bird Opening(the shared start itself)1
Bird Opening: From’s Gambit1...e52
Bird Opening: Hobbs Gambit1...g52
Bird Opening: Horsefly Defense1...Nh62
Bird Opening: Myers Defense1...b52
Bird Opening: From’s Gambit, Bahr Gambit1...e5 2.Nc33
Bird Opening: Mujannah1...Nf6 2.c43
Bird Opening: Wagner-Zwitersch Gambit1...f5 2.e43
Bird Opening: Double Duck Formation1...f5 2.d4 d54
Bird Opening: Hobbs-Zilbermints Gambit1...h6 2.Nf3 g54
Bird Opening: Lasker Gambit1...e5 2.fxe5 f64White +1
Bird Opening: Platz Gambit1...e5 2.fxe5 Ne74White +1
Bird Opening: Schlechter Gambit1...e5 2.fxe5 Nc64White +1
Bird Opening: Batavo-Polish Attack1...Nf6 2.Nf3 g6 3.b45
Bird Opening: From’s Gambit, Langheld Gambit1...e5 2.fxe5 d6 3.exd6 Nf66White +2
Bird Opening: Siegener Gambit1...e5 2.d4 exd4 3.Nf3 c5 4.c37Black +1
Bird Opening: Swiss Gambit1...f5 2.e4 fxe4 3.Nc3 Nf6 4.g47Black +1
Bird Opening: From’s Gambit, Lasker Variation1...e5 2.fxe5 d6 3.exd6 Bxd6 4.Nf3 g58White +1
Bird Opening: From’s Gambit, Lipke Variation1...e5 2.fxe5 d6 3.exd6 Bxd6 4.Nf3 Nh6 5.d49White +1

The position after 1.f4

Black is to move and has 20 legal moves.

WhiteBlackMaterial (pawn units)3939Minor pieces developed00Moves spent on pawns10Pawns on d4, e4, d5, e500Squares attacked in the other half20not castlednot castled

Codes that branch off from A02

The reference lines of one other code leave A02 from the position after 1.f4, each with its own moves.

CodeMovesReference line
A031...d5Bird Opening: Dutch Variation

Closest boards in other codes

CodeLineDiffers on
A00Van Geet Openingfour squares: b1, f2, c3, f4
A01Nimzo-Larsen Attackfour squares: b2, f2, b3, f4
A04Zukertort Openingfour squares: g1, f2, f3, f4
A10English Openingfour squares: c2, f2, c4, f4
A40Queen’s Pawn Gamefour squares: d2, f2, d4, f4
B00King’s Pawn Gamefour squares: e2, f2, e4, f4
B21Sicilian Defense: McDonnell Attackfour squares: e2, e4, c5, c7

Where lines continue from here

Eight named lines filed under other codes pass through the position after 1.f4. All of them belong to the codes listed above.

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

Other move orders

  • Bird Opening: From’s Gambit, Bahr Gambit is also reached inside A00 Van Geet Opening: Nowokunski Gambit, whose order is 1.Nc3 e5 2.f4.

Open this line in the finderAll Bird Opening codes