Theoria
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Indian Defense

Budapest Gambit Accepted, Fajarowicz Defense, Bonsdorf Variation

A51positionalsolid

  1. 1.d4Nf6
  2. 2.c4e5
  3. 3.dxe5Ne4
  4. 4.a3
577 games52%44%

Fajarowicz Defense line in which White's 4. a3 takes the b4 square from Black and prepares Qc2, a move that theory rates as White's best.

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About the Bonsdorf Variation

The Bonsdorf Variation, 4. a3, spends a tempo to take b4 away from Black. It rules out both ...Bb4+ and ...Nb4 and prepares Qc2 to challenge the knight on e4. Lalic and de Firmian both regard it as White's strongest reply, and engines give White a clear edge. De Firmian treats 4...Nc6 as the main answer, while Lalic prefers 4...b6. In online play 4...d6 is the most frequent choice.

Popular continuations