The Sämisch Variation of the Nimzo-Indian Defense opts for dynamic pawn structure strategies and piece activity. In the specific position after 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3, White has chosen to capture on c3 with the b-pawn. This leads to a solid pawn structure with potential to control the center, though it does create isolated pawns on the c-file. Black's options involve countering White's central ambitions and increasing the pressure on the center.
Best Moves
The Flexible ♙b6
The move ♙b6 prepares to fianchetto the bishop to b7. This aims for long-term pressure along the dark squares and enhancing control over the center. After a fianchetto, Black provides strong support to the potential d5 square, increasing influence on central and queenside areas. Furthermore, Black's pawn structure remains flexible, allowing for adjustments in the center depending on White's approach.
The Direct ♙c5
♙c5 strikes directly at the d4 pawn, looking to open lines and challenge White’s central solidity. With White having doubled pawns on the c-file, Black aims to leverage this by keeping the d- and c-file potentially open for tactics later. By contesting the center quickly, Black gains the possibility of a spatial equalization and prepares to dissolve White's center.
The Developing ♘Nc6
♘Nc6 prioritizes rapid piece development. The knight on c6 supports a swift d5 push and puts pressure on the key d4 square. Additionally, it keeps Black flexible with many strategies including timely exchanges to alleviate pressure and establish control over a stable center.
Important Alternatives
The Solid ♙d6
Choosing ♙d6 is an alternative for maintaining a solid pawn structure. Black sets up for a potential e5 or d5 break later and supports the key e5 square. It also provides a flexible structure that assists with quick piece development and might eventually transpose into lines with tactical opportunities that manipulate White’s pawn structure.
The Counter-attacking ♘Ne4
♘Ne4 immediately places pressure on White's d2 and c3. This invites an early confrontation, potentially disrupting White's coordination. This can lead to rapid exchanges giving Black tactical opportunities to exploit weaknesses, especially aiming at White's undoubled pawn structure.
Critical Mistakes
The Exposed ♙e5
Playing ♙e5 early exposes Black to an overextension risk. It potentially allows White to quickly react and seize the center with gains in tempo, particularly with pawn moves like ♙dxe5♘Ng4♙f4♙d6, leaving Black's pieces awkwardly placed and reducing Black’s options for improving their position.
The Dubious ♙g6
♙g6 is generally suboptimal because it does not directly address center control nor offer any immediate counterplay. It delays other crucial developing moves and can allow White to consolidate a strong central advantage with effective piece activity.
Conclusion
The Sämisch Variation, Accelerated, offers Black a rich amount of strategic and tactical possibilities. Efficient pawn strategies, particularly considering the center dynamics and the doubled pawns on the c-file, are key themes. While aggressive pursuits like ♙c5 and ♙b6 enable quick counterplay and central strikes, supporting moves like ♘Nc6 bring about safe development plans. Avoiding ill-considered attempts like ♙e5 or ♙g6 maximizes the opening's potential for balanced play.