Tree path 2 levels Nimzo-Indian Defense › Three Knights Variation
- Chess Codex
- Nimzo-Indian Defense E20
- Three Knights Variation E21 you are here
Nimzo-Indian Defense: Three Knights Variation
Overview
Nimzo-Indian Defense: Three Knights Variation is a specific line in the Indian Defenses family (ECO E21), arising from a recognised theoretical position.
The Indian Defenses group covers Indian defences — hypermodern lines where Black challenges the centre with pieces rather than pawns.
The line arises from 7 plies — specifically the moves 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3.
The line is a first-level refinement of Nimzo-Indian Defense.
The line splits into 5 documented sub-systems: Nimzo-Indian Defense: Romanishin Variation, Nimzo-Indian Defense: Romanishin Variation, English Hybrid, Nimzo-Indian Defense: St. Petersburg Variation, and others.
Together the deeper variations number 7 across the full subtree.
Explore the position on the interactive board, study its real-world results from Lichess, and challenge the engine when you are ready.
- ECO code
- E21
- Group
- Indian Defenses (E)
- Plies
- 7
- Parent
- Nimzo-Indian Defense
- Direct variations
- 5
- Total in subtree
- 7
This overview is generated automatically from the opening's metadata. A more detailed, human-written description is on the way — and you can speed it up by suggesting one yourself.
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Variations (5)
Show all 7 sub-variations (full subtree)
- E20 Nimzo-Indian Defense: Romanishin Variation 11-ply
- E20 Nimzo-Indian Defense: Romanishin Variation, English Hybrid 16-ply
- E43 Nimzo-Indian Defense: St. Petersburg Variation 15-ply
- E43 Nimzo-Indian Defense: St. Petersburg Variation 11-ply
- E21 Korchnoi Variation 9-ply
- E43 Nimzo-Indian Defense: St. Petersburg Variation 17-ply
- E21 Nimzo-Indian Defense: Three Knights Variation, Euwe Variation 10-ply