D00-D99

The Queen's Gambit Accepted. Black takes the pawn, allowing White a free hand in the center but gaining rapid development and a clear plan for counterplay.

Sidelines in the QGA. White uses various move orders to regain the pawn or prevent Black's preferred setups, leading to fresh and less-explored positions.

The QGA with 3.Nf3 a6. Black prepares to hold the queenside space. It is a flexible system that requires White to play accurately to prove an advantage.

White develops the knight and queen to pressure the center. It avoids the most tactical QGA lines in favor of a stable positional edge.

The QGA with 4.Nc3. White focuses on rapid piece development to pressure the d5 and e4 squares before recovering the pawn on c4.

The QGA with 3.Nf3 Nf6 4.e3. The most classical way to recover the pawn. It leads to a balanced middle-game with a slight space advantage for White.

A theoretical branch of the 4.e3 QGA. White completes development while Black prepares to challenge the center with c5.

The QGA Classical Main Line. Both sides follow a long, well-established path resulting in an isolated queen's pawn structure or a symmetrical center.

White plays Qe2 to avoid the exchange of queens. It is an ambitious attempt to keep the position complex and play for a kingside attack.

The QGA with a late b5. Black expands on the queenside to create long-term counterplay. It leads to sharp and strategically demanding positions.