King's Indian Defense: Orthodox Variation, Positional Defense, Main Line

The King's Indian Defense: Orthodox Variation, Positional Defense, Main Line is a solid and flexible opening for Black, aiming to counter White's central pawn structure.

The opening is characterized by Black allowing White to establish a strong pawn center with pawns on d4 and e4, while focusing on developing their pieces and preparing to counterattack. Black's pawn structure is typically more compact and less vulnerable to attack, with pawns on d6, e5, and c6. The fianchettoed dark-squared bishop on g7 is a key piece in this defense, as it exerts pressure on the long diagonal and supports Black's pawn breaks.

White's main plan in this opening is to maintain their central pawn structure and exploit any weaknesses in Black's position. The knight on f3 and the bishop on e2 are well-placed to support this plan, while the rook on e1 adds additional pressure on the e-file.

Black's knight on d7 and pawn on a5 are important in supporting the c6 and e5 pawn breaks, which can help Black challenge White's central pawn structure and create counterplay. The pawn on a5 also helps to prevent White from expanding on the queenside with b4.

Overall, the King's Indian Defense: Orthodox Variation, Positional Defense, Main Line is a solid and flexible opening choice for Black, offering chances for counterplay and a rich middlegame full of strategic and tactical possibilities.