King's Gambit Accepted, Fischer Defense

The Fischer Defense begins with 1.e4 e5 2.f4 exf4 3.Nf3 d6. Black has accepted the gambit and now advances the d7-pawn to d6. The move controls e5, an advanced square White’s knight could use to enter the center, and opens the diagonal for Black’s c8-bishop.

The move 3...d6 does not directly protect Black’s pawn on f4. Its purpose is to prepare a more stable defense: Black often considers ...g5 to support that pawn and gain kingside space. By controlling e5 first, Black reduces some active knight responses to that advance. The plan aims to keep the material without creating as many immediate weaknesses as a premature ...g5.

White still has compensation through development and may build a center with d4, place the bishop on c4, or attack Black’s pawn chain. Compensation means nonmaterial advantages, such as activity, space, or king safety, received in return for the sacrificed pawn. Black must still complete development; keeping f4 has little value if the king remains trapped in the center.

The logic of the move order

The Cunningham Defense develops the bishop with 3...Be7 and prepares ...Bh4+. The Fischer first plays 3...d6 to deny e5 to White’s knight and only then organizes the defense of the f4-pawn.