Indian Defense: Budapest Gambit Accepted, Fajarowicz Defense, Bonsdorf Variation

1.d4 Nf6 2.c4 e5 3.dxe5 Ne4 4.a3

ECO A51

The Indian Defense: Budapest Gambit Accepted, Fajarowicz Defense, Bonsdorf Variation is a chess opening line in the Indian Defense complex, reached after 1.d4 Nf6 2.c4 e5 3.dxe5 Ne4 4.a3.

It is catalogued under code A51 in the Encyclopaedia of Chess Openings (ECO).

The defining move a3 is chosen by White on move 4.

Study this line with a grandmaster

This position is covered in the Budapest Gambit course: a GM-authored repertoire you study move by move, then practice against a human-like AI opponent.

Every chess term used here is defined in the chess terms glossary. Browse all opening courses or the full ECO code index.