ecocodes
Volume E · Indian defenses‹ E43E45 ›
a1b2c3d4e5f6g7h8
Reference position · Black to move

E44 Nimzo-Indian Defense: St. Petersburg Variation

E44 holds three named lines, all under the name Nimzo-Indian Defense. It leaves E43, a position of the same name, with 5.Ne2. That final move, by the knight, opens a line for the rook on h1. Of all other reference positions, the board of E45 (St. Petersburg Variation, Fischer Variation) comes closest, two squares apart.

Score sheet
#WhiteBlack
1d4Nf6
2c4e6
3Nc3Bb4
4e3b6
5Ne2

Lines filed under E44

All three share their first nine plies, the whole reference line and then split two ways at Black’s move 5.

NameAfter the shared startPlies
Nimzo-Indian Defense: St. Petersburg Variation(the shared start itself)9
Nimzo-Indian Defense: St. Petersburg Variation, American Variation5...Ne410
Nimzo-Indian Defense: St. Petersburg Variation, Romanishin-Psakhis Variation5...c5 6.a3 Ba512

Nimzo-Indian Defense: St. Petersburg Variation, American Variation

  1. 5...Ne4 The knight goes from f6 to e4, opening a line for the queen on d8, attacking the knight on c3.

Nimzo-Indian Defense: St. Petersburg Variation, Romanishin-Psakhis Variation

  1. 5...c5 The c-pawn advances two squares to c5, covering b4 and d4, opening a line for the queen on d8.
  2. 6.a3 The a-pawn advances to a3, covering b4, opening a line for the rook on a1, attacking the bishop on b4.
  3. 6...Ba5 The bishop goes from b4 to a5, attacking the knight on c3, pinning the knight on c3 to its king.

The road to E44

  1. 1.d4 … 3...Bb4four earlier stops: A40, A45, A50, E20
  2. 4.e3E40 Rubinstein System
  3. 4...b6E43 St. Petersburg Variation
  4. 5.Ne2E44

The position after 5.Ne2

White has brought out the knight on c3 and knight on e2; Black the knight on f6 and bishop on b4. Black could capture with Bxc3+. Black is to move and has 34 legal moves.

WhiteBlackMaterial (pawn units)3939Minor pieces developed22Moves spent on pawns32Pawns on d4, e4, d5, e510Squares attacked in the other half44not castlednot castled

Codes that branch off from E44

The reference lines of one other code leave E44 from the position after 5.Ne2, each with its own moves.

CodeMovesReference line
E455...Ba6Nimzo-Indian Defense: St. Petersburg Variation, Fischer Variation

Closest boards in other codes

CodeLineDiffers on
E40Nimzo-Indian Defense: Rubinstein Systemfour squares: g1, e2, b6, b7
E42Nimzo-Indian Defense: Rubinstein System, Rubinstein Variationfour squares: c5, b6, b7, c7
E20Nimzo-Indian Defensefive squares: g1, e2, e3, b6, b7
E21Nimzo-Indian Defense: Three Knights Variationfive squares: e2, e3, f3, b6, b7
E14Queen’s Indian Defense: Spassky Systemsix squares: b1, e2, c3, f3, b4, f8
E41Nimzo-Indian Defense: Rubinstein Systemsix squares: g1, e2, c5, b6, b7, c7
D38Queen’s Gambit Declined: Ragozin Defenseseven squares: e2, e3, f3, d5, b6, b7, d7

Where lines continue from here

One named line filed under other codes passes through the position after 5.Ne2. It belongs to the code listed above.

Volume E

  1. 00
  2. 01
  3. 02
  4. 03
  5. 04
  6. 05
  7. 06
  8. 07
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  96. 95
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  98. 97
  99. 98
  100. 99

Open this line in the finderAll Nimzo-Indian Defense codes