The Nimzo-Indian Defense, specifically the Gligoric System and Smyslov Variation, arises after 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O dxc4 8. Bxc4 Qe7. This solid and strategic opening is popular due to its ability to achieve a balanced and flexible pawn structure for Black while controlling the center and facilitating piece development.
Best Moves
The Precise ♙a3
The move ♙a3 serves a dual purpose. It immediately questions the bishop on b4, preparing to capture and compromise Black's pawn structure if exchanged. Additionally, it supports the forthcoming pawn expansion with b4, gaining valuable space on the queenside. After ♗Ba5, White can continue with Na4, challenging the bishop and preparing cxd5, exerting pressure in the center and on the queenside.
The Strategic ♖Re1
With ♖Re1, White reinforces the e4-pawn break. This move aligns with the principles of opening play by activating the rook and eventually plans to support dxc5 followed by e4, seizing the center. The placement of the rook also helps indirectly defend the e3 pawn; if Black plays Nc6, White can play a3 and b4 to expand on the queenside.
Important Alternatives
The Flexible ♗Bd2
On playing ♗Bd2, White bolsters the pin on the knight, indirectly supporting e4 by removing potential threats on the d2 bishop. This maneuver is usually paired with plans of Rfd1 and retaining central tension without immediate exchanges.
Critical Mistakes
The Misguided ♙g4
The move ♙g4 severely weakens White's kingside. It provides no immediate tactical or positional benefits, and instead, exposes the king to potential attacks along the kingside pawns. Black can easily exploit this by reorganizing their forces for an assault on the weakened kingside pawns.
The Erroneous ♘Ne4
Attempting ♘Ne4 proves detrimental due to the possibility of losing control over critical central squares. Black can leverage this move to gain tempo via captures, and the resulting open lines invite Black's pieces into active play.
Conclusion
The Nimzo-Indian Defense presents multiple strategies for both sides. Key strategic ideas include maintaining tension on the center and exploiting pawn structures for viable piece play and control. Best moves often align with strategic objectives such as positional reinforcement, tactical preparedness, and flexible pawn play. Alternatives offer various plans, though care must be taken to avoid blunders that can swing the momentum towards the opponent. Understanding these lines underpins successful maneuvers in the Smyslov Variation of the Gligoric System.