The St. Petersburg Variation, Fischer Variation is a variation of the Nimzo-Indian Defense, catalogued as ECO E45. The line runs 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Ne2 Ba6, reaching the position shown below after 10 half-moves.
White holds the centre with pawns on d4. Development is level at two minor pieces each. It is White to move after five moves.
On the Nimzo-Indian Defense generally: One of the most respected defenses to 1.d4. Black pins the knight and fights for central control.
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The St. Petersburg Variation, Fischer Variation goes 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Ne2 Ba6. It is a variation of the Nimzo-Indian Defense and is catalogued as ECO E45.
The St. Petersburg Variation, Fischer Variation is ECO E45. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Nimzo-Indian Defense.
Stockfish evaluates the position after 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Ne2 Ba6 at +0.50 at depth 18, which is a slight pull for White, within normal opening margins. Engine evaluation is only a starting point — at club level the practical value of a line is mostly about whether you know its plans better than your opponent does.
White holds the centre with pawns on d4. Development is level at two minor pieces each. It is White to move.