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Classical 0-0 Line
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 0-0 5.a3 Bxc3+ 6.Qxc3 b6
Black castles early and follows with ...b6, combining classical safety with flexible queenside development. White keeps the bishop pair and a strong central presence.
ECO Code
E36-E39
Difficulty
Advanced
Style
Theoretical/Positional
Key Theme
Early king safety and ...b6 flexibility
Strategic Ideas
- Safe king first: Black avoids tactical issues by castling early.
- Dark-square pressure: ...Bb7 and ...d6 challenge White's center.
- Bishop pair tension: White seeks open lines for long-term pressure.
- Flexible breaks: Black can choose ...d5 or ...c5 structures.
- Development race: Both sides need accurate move order handling.
Main Continuations
Standard Build
7.Bg5 Bb7 8.e3 d6
Black completes the queenside setup and keeps central flexibility.
Immediate ...d5
7.Bg5 d5 8.e3
Black challenges White's center before White can expand.
Quiet White Plan
7.Nf3 Bb7 8.Bg5
White develops normally and waits for the best central break.
Typical Plans
For White
- Space edge: Develop smoothly and choose the best moment for e4.
- Bishop activity: Preserve open diagonals where possible.
- Central pressure: cxd5 and Nf3 plans keep Black honest.
For Black
- Challenge center: Use ...d5 or ...c5 with concrete support.
- Piece coordination: ...Nbd7 and ...Re8 are common supports.
- Simplify prudently: Reduce White's bishop-pair potential.
Common Mistakes
White: Forcing e4 too early can concede key dark squares.
Black: Slow queenside development may allow White stable pressure.
Related Nimzo Lines
Master the Classical 0-0 Line
Learn how early king safety and precise timing shape this major Nimzo branch.
Back to Nimzo-Indian Defense Explore Classical Main Line