The position arises from the King's Gambit Declined, specifically the Falkbeer Countergambit in the Anderssen Attack variation. White has initiated an aggressive play with ♗Bb5+, checking the black king and interrupting Black's central pawn push. Black's king-side and center need to be considered carefully to avoid falling into passive positions.
Best Moves
The Solid ♙c6
The move ♙c6 is among the best options for Black. Playing c6 blocks the check from the bishop and prepares support for the pawn on d5. This move aims to maintain the pawn structure and lessen White's aggressive intentions. Following this, Black can continue with ♙dxc6♘Nxc6♘Nc3, creating a solid structure and planning to develop the knight on f6. Playing c6 is both defensive and proactive, as it enables further development and supports the intent to challenge the center once again.
Developing ♗Bd7
Another strong response is Bd7, which both develops a piece and directly addresses the check. This move prepares for the capture on b5, either gaining the bishop pair or forcing White to initiate exchanges favorably. After Bd7, Black aims to develop naturally, first relieving the pin and potentially preparing to castle. The subsequent sequence of ♕Qe2♘Nf6♘Nc3 helps Black maintain solid development while avoiding any major weaknesses.
Important Alternatives
The Flexible ♘Nd7
Nd7 is a plausible alternative that focuses on developing a piece and alleviating the immediate check while not overly committing pawn structure or piece positions. Although not as dynamic as the best moves, Nd7 opts for simple development and flexibility. It intends to maintain options for future engagement in the center or kingside while potentially preparing for a break with f5.
Critical Mistakes
The Dubious ♔Ke7
Opting for Ke7 is a critical mistake that leaves Black's position vulnerable. This move disrupts the potential for castling and leaves the black king exposed and awkwardly placed. Following this, White can quickly build attacking threats with simple development and might exploit the dark squares that have been weakened due to the king's improper placement.
The Ill-Advised ♘Nc6
Playing Nc6 in response to the check is a highly suboptimal choice as it blocks the c-pawn, hindering Black’s potential for support and development on the queenside. In addition, Nc6 does not address the d5 pawn's protection efficiently, making it susceptible to tactics based around pinned pieces or weak squares.
Conclusion
In this position from the King's Gambit Declined, specifically the Falkbeer Countergambit: Anderssen Attack, Black must carefully address White's check with a move that supports central control and development. Playing moves like c6 or Bd7 offers Black robust responses, whereas opting for Ke7 or Nc6 unnecessarily weakens Black's position. The goal should be to maintain flexibility while developing pieces harmoniously and safely, preparing for both defensive and counter-attacking ideas.