ecocodes
Volume A · Flank openings‹ A08A10 ›
a1b2c3d4e5f6g7h8
Reference position · Black to move

A09 Réti Opening

A09 holds nine named lines, all under the name Réti Opening. It leaves A06 (Zukertort Opening) with 2.c4. Material is no longer level at the end of two of its lines; the widest gap, one pawn in Black’s favour, comes in Réti Opening: Réti Accepted. That final move, by the c-pawn, covers b5 and d5 and opens a line for the queen on d1.

Score sheet
#WhiteBlack
1Nf3d5
2c4

Lines filed under A09

All nine share their first three plies, the whole reference line and then split three ways at Black’s move 2.

NameAfter the shared startPliesAt the end
Réti Opening(the shared start itself)3
Réti Opening: Advance Variation2...d44
Réti Opening: Réti Accepted2...dxc44Black +1
Réti Opening: Zilbermints Gambit2...b54
Réti Opening: Penguin Variation2...d4 3.Rg15
Réti Opening: Advance Variation, Michel Gambit2...d4 3.b4 c56
Réti Opening: Advance Variation, Navara Gambit2...d4 3.b4 g56
Réti Opening: Réti Gambit, Keres Variation2...dxc4 3.e3 Be66Black +1
Réti Opening: Reversed Blumenfeld Gambit2...d4 3.e3 c5 4.b47

The road to A09

  1. 1.Nf3A04 Zukertort Opening
  2. 1...d5A06 Zukertort Opening
  3. 2.c4A09

The position after 2.c4

White has brought out the knight on f3; Black has not yet moved a knight or bishop. Black could capture with dxc4. Undefended and attacked: the pawn on c4. Black is to move and has 29 legal moves.

WhiteBlackMaterial (pawn units)3939Minor pieces developed10Moves spent on pawns11Pawns on d4, e4, d5, e501Squares attacked in the other half44not castlednot castled

Codes that branch off from A09

The reference lines of one other code leave A09 from the position after 2.c4, each with its own moves.

CodeMovesReference line
A122...c6 3.b3Réti Opening: Anglo-Slav Variation, Bogoljubow Variation

Closest boards in other codes

CodeLineDiffers on
A04Zukertort Openingfour squares: c2, c4, d5, d7
A07King’s Indian Attackfour squares: c2, g2, g3, c4
A10English Openingfour squares: g1, f3, d5, d7
D02Queen’s Pawn Game: Zukertort Variationfour squares: c2, d2, c4, d4
D06Queen’s Gambitfour squares: g1, d2, f3, d4
D11Slav Defense: Modern Linefour squares: d2, d4, c6, c7
D21Queen’s Gambit Accepted: Normal Variationfour squares: d2, c4, d4, d5

Where lines continue from here

Six named lines filed under other codes pass through the position after 2.c4. Besides the codes above, they belong to A14.

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

Open this line in the finderAll Réti Opening codes