A51 Indian Defense: Budapest Gambit
A51 holds five named lines, all under the name Indian Defense. It leaves A50 (Indian Defense: Normal Variation) with 2...e5. Black’s pieces and pawns attack six squares in White’s half, level for the most of the 8 Indian Defense codes. White, to move in that position, has 31 legal moves, the second-highest count of the 8 Indian Defense codes. Material is no longer level at the end of four of its lines; the widest gap, one pawn in White’s favour, comes in Indian Defense: Budapest Gambit Accepted.
| # | White | Black |
|---|---|---|
| 1 | d4 | Nf6 |
| 2 | c4 | e5 |
The move that completes A51
The reference line of A52 plays all of these moves and continues beyond them; A51 is the position reached at 2...e5.
- 2...e5 The e-pawn advances two squares to e5, covering d4 and f4, opening a line for the queen on d8 and the bishop on f8.
Lines filed under A51
All five share their first four plies, the whole reference line.
| Name | After the shared start | Plies | At the end |
|---|---|---|---|
| Indian Defense: Budapest Gambit | (the shared start itself) | 4 | |
| Indian Defense: Budapest Gambit Accepted | 3.dxe5 | 5 | White +1 |
| Indian Defense: Budapest Gambit Accepted, Fajarowicz Defense | 3.dxe5 Ne4 | 6 | White +1 |
| Indian Defense: Budapest Gambit Accepted, Fajarowicz Defense, Bonsdorf Variation | 3.dxe5 Ne4 4.a3 | 7 | White +1 |
| Indian Defense: Budapest Gambit Accepted, Fajarowicz Defense, Steiner Variation | 3.dxe5 Ne4 4.Qc2 | 7 | White +1 |
The road to A51
- 1.d4one earlier stop: A40
- 1...Nf6A45 Indian Defense
- 2.c4A50 Normal Variation
- 2...e5A51
The position after 2...e5
Black has brought out the knight on f6; White has not yet moved a knight or bishop. White could capture with dxe5. Undefended and attacked: the pawn on e5.
Codes that branch off from A51
The reference lines of one other code leave A51 from the position after 3.dxe5, each with its own moves.
| Code | Moves | Reference line |
|---|---|---|
| A52 | 3...Ng4 | Indian Defense: Budapest Gambit Accepted, Main Line |
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| A15 | English Opening: Anglo-Indian Defense | four squares: d2, d4, e5, e7 |
| A20 | English Opening: King’s English Variation | four squares: d2, d4, f6, g8 |
| A22 | English Opening: King’s English Variation, Two Knights Variation | four squares: b1, d2, c3, d4 |
| A45 | Indian Defense | four squares: c2, c4, e5, e7 |
| A53 | Old Indian Defense | four squares: e5, d6, d7, e7 |
| A56 | Benoni Defense | four squares: c5, e5, c7, e7 |
| D08 | Queen’s Gambit Declined: Albin Countergambit | four squares: d5, f6, d7, g8 |
Where lines continue from here
Six named lines filed under other codes pass through the position after 2...e5. All of them belong to the codes listed above.