A43 Benoni Defense: Old Benoni
Also filed here: Indian Defense, Queen’s Pawn Game.
A43 holds 20 named lines from three openings, most of them (18) under Benoni Defense. It leaves A40 (Queen’s Pawn Game) with 1...c5. With 20 named lines it is the largest code of the 23 Benoni Defense codes. At two plies, its reference line is the shortest of the 23 Benoni Defense codes. Black’s pieces and pawns attack two squares in White’s half, the fewest of the 23 Benoni Defense codes.
| # | White | Black |
|---|---|---|
| 1 | d4 | c5 |
The move that completes A43
The reference line of A44 plays all of these moves and continues beyond them; A43 is the position reached at 1...c5.
- 1...c5 The c-pawn advances two squares to c5, covering b4 and d4, opening a line for the queen on d8.
Lines filed under A43
They begin with two different first moves.
| Name | After the shared start | Plies | At the end |
|---|---|---|---|
| Benoni Defense: Old Benoni | 1.d4 c5 | 2 | |
| Benoni Defense: Benoni Gambit Accepted | 1.d4 c5 2.dxc5 | 3 | White +1 |
| Benoni Defense: Old Benoni | 1.d4 c5 2.d5 | 3 | |
| Benoni Defense: Zilbermints-Benoni Gambit | 1.d4 c5 2.b4 | 3 | |
| Benoni Defense: Benoni Gambit, Schlenker Defense | 1.d4 c5 2.dxc5 Na6 | 4 | White +1 |
| Benoni Defense: Benoni-Indian Defense | 1.d4 c5 2.d5 Nf6 | 4 | |
| Benoni Defense: Cormorant Gambit | 1.d4 c5 2.dxc5 b6 | 4 | White +1 |
| Benoni Defense: Old Benoni | 1.d4 c5 2.d5 d6 | 4 | |
| Benoni Defense: Old Benoni, Mujannah Formation | 1.d4 c5 2.d5 f5 | 4 | |
| Benoni Defense: Snail Variation | 1.d4 c5 2.d5 Na6 | 4 | |
| Benoni Defense: Benoni-Indian Defense, Kingside Move Order | 1.d4 c5 2.d5 Nf6 3.Nf3 | 5 | |
| Benoni Defense: Benoni-Staunton Gambit | 1.d4 c5 2.d5 f5 3.e4 | 5 | |
| Benoni Defense: French Benoni | 1.e4 e6 2.d4 c5 3.d5 | 5 | |
| Benoni Defense: Zilbermints-Benoni Gambit | 1.d4 c5 2.Nf3 cxd4 3.b4 | 5 | Black +1 |
| Queen’s Pawn Game: Liedmann Gambit | 1.d4 c5 2.c4 cxd4 3.e3 | 5 | Black +1 |
| Benoni Defense: Hawk Variation | 1.d4 Nf6 2.Nf3 c5 3.d5 c4 | 6 | |
| Benoni Defense: Old Benoni, Schmid Variation | 1.d4 c5 2.d5 d6 3.Nc3 g6 | 6 | |
| Benoni Defense: Woozle | 1.d4 c5 2.d5 Nf6 3.Nc3 Qa5 | 6 | |
| Benoni Defense: Zilbermints-Benoni Gambit, Tamarkin Countergambit | 1.d4 c5 2.Nf3 cxd4 3.b4 e5 | 6 | Black +1 |
| Indian Defense: Pseudo-Benko | 1.d4 Nf6 2.Nf3 c5 3.d5 b5 | 6 |
The road to A43
- 1.d4A40 Queen’s Pawn Game
- 1...c5A43
The position after 1...c5
White could capture with dxc5. Undefended and attacked: the pawn on c5. White is to move and has 29 legal moves.
Codes that branch off from A43
The reference lines of one other code leave A43 from the position after 2.d5, each with its own moves.
| Code | Moves | Reference line |
|---|---|---|
| A44 | 2...e5 | Benoni Defense: Old Benoni |
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| A30 | English Opening: Symmetrical Variation | four squares: c2, d2, c4, d4 |
| A41 | Queen’s Pawn Game | four squares: c5, d6, c7, d7 |
| A45 | Indian Defense | four squares: c5, f6, c7, g8 |
| A56 | Benoni Defense | four squares: c2, c4, f6, g8 |
| A80 | Dutch Defense | four squares: c5, f5, c7, f7 |
| B12 | Caro-Kann Defense | four squares: e2, e4, c5, c6 |
| B20 | Sicilian Defense | four squares: d2, e2, d4, e4 |
Where lines continue from here
Two named lines filed under other codes pass through the position after 1...c5. All of them belong to the codes listed above.