Indian Defense: Budapest Gambit Accepted, Fajarowicz Defense, Bonsdorf Variation
1. d4 Nf6 2. c4 e5 3. dxe5 Ne4 4. a3
The Indian Defense: Budapest Gambit Accepted, Fajarowicz Defense, Bonsdorf Variation is a chess opening classified as ECO A51, reached after 1. d4 Nf6 2. c4 e5 3. dxe5 Ne4 4. a3. It is a line of the Indian Defense. Black is to move.
In 12.6 million rated Lichess games (blitz and slower), this position was reached 224 times by this move order. White won 43%, 5% were drawn and Black won 52%. The most popular continuation is 4… d6 (42% of games).
Engine evaluation: +0.97 (Stockfish, depth 50; best line 4… d6 5. Qc2 Nc5 6. exd6 Bxd6 7. Nc3)
- ECO
- A51
- Moves
- 7 plies
- FEN
rnbqkb1r/pppp1ppp/8/4P3/2P1n3/P7/1P2PPPP/RNBQKBNR b KQkq - 0 4- PGN
1. d4 Nf6 2. c4 e5 3. dxe5 Ne4 4. a3
Analyse with Stockfish · Board image (SVG) · Open on Lichess
Results by rating
| Average rating | Games | White / draw / Black |
|---|---|---|
| 0-1499 | 5 | |
| 1500-1999 | 76 | |
| 2000+ | 143 | |
| All | 224 |
Most played moves
| Move | Games | White / draw / Black |
|---|---|---|
| 4… d6 | 94 (42%) | |
| 4… b6 | 47 (21%) | |
| 4… Nc6 | 36 (16%) | |
| 4… a5 | 22 (10%) | |
| 4… Bc5 | 17 (8%) | |
| 4… Qh4 | 2 (1%) | |
| 4… Qe7 | 1 (0%) | |
| 4… Nc5 | 1 (0%) |
Master games
224 over-the-board games are classified under this line (White 52%, draw 11%, Black 37%). The strongest:
- GM Magnus Carlsen (2839) – IM Yaacov Norowitz (2400) 1-0 · Titled Tue 5th Aug Late · 2025-08-05
- GM Matthias Bluebaum (2640) – IM Yaacov Norowitz (2402) 1-0 · Titled Tue 1st Oct Late · 2024-10-01
- Antoni Kozak (2458) – GM Evgeny Postny (2568) 1-0 · Titled Tue 29th Mar Early · 2022-03-29
- GM David Paravyan (2586) – IM Yaacov Norowitz (2402) 1-0 · Titled Tue 28th Feb Late · 2023-02-28
- FM Hampus Sorensen (2395) – GM Evgeny Postny (2587) 1-0 · Titled Tuesday 6th Apr · 2021-04-06
Highest-rated Lichess games
- WOW_PEDRO (2562) – GolfeDuMorbihan (2692) 1-0 · 2026-09-03 · 180 + 0s
- Ishmael67 (2522) – nobody12 (2577) 1-0 · 2026-09-02 · 180 + 0s
- Stallion28 (2557) – d4satranc (2521) 1-0 · 2026-09-06 · 180 + 0s
Comes from
Indian Defense: Budapest Gambit Accepted, Fajarowicz Defense 1. d4 Nf6 2. c4 e5 3. dxe5 Ne4
More Indian Defense lines (all)
- Indian Defense: Pseudo-Benko A43
- Indian Defense (1. d4 Nf6) A45
- Indian Defense: Accelerated London System A45
- Indian Defense: Gedult Attack A45
- Indian Defense: Gibbins-Weidenhagen Gambit A45
- Indian Defense: Gibbins-Weidenhagen Gambit Accepted A45
- Indian Defense: Gibbins-Weidenhagen Gambit, Maltese Falcon A45
- Indian Defense: Gibbins-Weidenhagen Gambit, Oshima Defense A45
- Indian Defense: Gibbins-Weidenhagen Gambit, Stummer Gambit A45
- Indian Defense: Lazard Gambit A45
- Indian Defense: Maddigan Gambit A45
- Indian Defense: Omega Gambit A45
Opening names and moves from the Lichess openings dataset; statistics from the Lichess open database, 2026-09 (CC0), sample of 12.6 million games, bots excluded; evaluations from Lichess cloud analysis (all CC0). Master games from The Week in Chess #920–#1664 by Mark Crowther, used with permission.