ecocodes
Volume A · Flank openings‹ A54A56 ›
a1b2c3d4e5f6g7h8
Reference position · Black to move

A55 Old Indian Defense: Normal Variation

A55 holds a single named line. It leaves A53 (Old Indian Defense) with 3.Nc3 Nbd7 4.e4 e5 5.Nf3. That final move, by the knight, opens a line for the rook on h1. Of all other reference positions, the board of A28 (English Opening: King’s English Variation, Four Knights Variation) comes closest, seven squares apart.

Score sheet
#WhiteBlack
1d4Nf6
2c4d6
3Nc3Nbd7
4e4e5
5Nf3

Moves only A55 plays

Same as A53 up to 2...d6, then:

  1. 3.Nc3 The knight leaves b1 for c3, opening a line for the rook on a1.
  2. 3...Nbd7 The knight leaves b8 for d7, opening a line for the rook on a8.
  3. 4.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.
  4. 4...e5 The e-pawn advances two squares to e5, covering d4 and f4, opening a line for the queen on d8 and the bishop on f8.
  5. 5.Nf3 The knight leaves g1 for f3, opening a line for the rook on h1.

The road to A55

  1. 1.d4 … 1...Nf6two earlier stops: A40, A45
  2. 2.c4A50 Normal Variation
  3. 2...d6A53 Old Indian Defense
  4. 5.Nf3A55

The position after 5.Nf3

White has brought out the knight on c3 and knight on f3; Black the knight on d7 and knight on f6. Black could capture with Nxe4, exd4. Black is to move and has 25 legal moves.

WhiteBlackMaterial (pawn units)3939Minor pieces developed22Moves spent on pawns32Pawns on d4, e4, d5, e521Squares attacked in the other half74not castlednot castled

Closest boards in other codes

CodeLineDiffers on
C43Petrov’s Defense: Modern Attackseven squares: b1, c2, c3, c4, d6, d7, b8
C47Four Knights Gameseven squares: c2, d2, c4, d4, c6, d6, d7
E90King’s Indian Defense: Normal Variation, Rare Defensesseven squares: e5, g6, d7, e7, g7, b8, f8
B08Pirc Defense: Classical Variationeight squares: c2, c4, e5, g6, d7, e7, g7, b8
C56Italian Game: Two Knights Defense, Open Variationeight squares: b1, f1, c2, c3, c4, c6, d6, d7
D24Queen’s Gambit Accepted: Showalter Variationeight squares: e2, c4, e4, e5, d6, d7, e7, b8
D37Queen’s Gambit Declined: Three Knights Variationeight squares: e2, e4, d5, e5, d6, e6, d7, b8

Where lines continue from here

One named line filed under other codes passes through the position after 5.Nf3. It belongs to E94.

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
  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
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  35. 34
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  44. 43
  45. 44
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  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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  99. 98
  100. 99

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