ecocodes
a1b2c3d4e5f6g7h8
After 2...Nf6 · White to move

Petrov’s Defense

The list files 50 lines under the name Petrov’s Defense, spread over two codes (C42–C43). C42 alone holds 40 of them. From the starting position of Petrov’s Defense, the most-travelled continuation is 3.Nxe5, with 36 lines. The deepest, Petrov’s Defense: Classical Attack, Marshall Trap, runs to 10...Bxh2+. At the end of 19 lines one side is ahead on material; 11 names contain the word Gambit.

Score sheet
#WhiteBlack
1e4e5
2Nf3Nf6

Where the lines split

Forty-nine of the 50 lines continue from 2...Nf6; the bars show how many take each next move, and the indented rows the most common reply.

  1. 3.Nxe536
    1. 3...d629
    2. 3...Nc64
    3. 3...Nxe42
  2. 3.d410
    1. 3...exd45
    2. 3...Nxe43
    3. 3...d51
  3. 3.Bc41
  4. 3.Nc31
  5. 3.Qe21
    1. 3...Nc61

Codes holding Petrov’s Defense lines

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
CodeReference lineLinesLongest line (plies)
C42Petrov’s Defense40Petrov’s Defense: Classical Attack, Marshall Trap (20)
C43Petrov’s Defense: Modern Attack10Petrov’s Defense: Modern Attack, Trifunovic Variation (14)

Longest Petrov’s Defense lines

  1. Petrov’s Defense: Classical Attack, Marshall Trap 20
  2. Petrov’s Defense: Classical Attack, Maróczy Variation 20
  3. Petrov’s Defense: Classical Attack, Berger Variation 19
  4. Petrov’s Defense: Classical Attack, Krause Variation 19
  5. Petrov’s Defense: Classical Attack, Marshall Variation, Chinese Gambit 18
  6. Petrov’s Defense: Classical Attack, Chigorin Variation, Browne Attack 17
  7. Petrov’s Defense: Classical Attack, Chigorin Variation, Main Line 17
  8. Petrov’s Defense: Classical Attack, Staunton Variation 16