About this opening
Nimzo-Indian Defense: St. Petersburg Variation, with Ne4 is an opening in the Encyclopedia of Chess Openings,
classified under code E43. ECO group E (E00–E99)
covers Indian defences against 1.d4, covering the Nimzo-Indian, Queen's Indian, King's Indian and Catalan systems. This particular variation is reached
after 12 half-moves from the
starting position, with the move sequence 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Bd3 Bb7 6. Nf3 Ne4.
It belongs to the Nimzo-Indian Defense family.
Within that family this is a level-2 branch (the St. Petersburg Variation → with Ne4 line). The immediate parent line is Nimzo-Indian Defense: St. Petersburg Variation, transitioned via 6…Ne4.
The opening sequence in prose form: 1.d4 Nf6, 2.c4 e6, 3.Nc3 Bb4, 4.e3 b6, 5.Bd3 Bb7, 6.Nf3 Ne4. From this position the encyclopaedia records no further canonical continuations — practical play branches into unnamed transpositions or returns to the parent line for alternative ideas.
Use the interactive board above to walk through the moves position-by-position. Click any move in the navigation to step backwards, or use the keyboard arrow keys. For statistical data — how often master-level players have reached this position, White's win-rate, draw frequency, Black's score — see the panel in the right column.
Caissly's coverage of E43 extends through every named sub-variation in this line and across all four locales (English, Spanish, Portuguese, Russian). Where editorial commentary exists for a specific variation it appears as the page body; otherwise the page presents the structural data, board, and statistics as shown here.