A41 Queen’s Pawn Game
Also filed here: Rat Defense, Modern Defense, Old Indian Defense, Robatsch Defense, Wade Defense, Zukertort Opening.
A41 holds 11 named lines from seven openings, most of them (three) under Rat Defense. It leaves A40, a position of the same name, with 1...d6. Black’s pieces and pawns attack two squares in White’s half, the second-lowest count of the 7 Queen’s Pawn Game codes. At two plies, its reference line is the second-shortest of the 7 Queen’s Pawn Game codes. Material is no longer level at the end of two of its lines; the widest gap, one pawn in White’s favour, comes in Rat Defense: English Rat, Lisbon Gambit.
| # | White | Black |
|---|---|---|
| 1 | d4 | d6 |
Moves only A41 plays
Same as A40 up to 1.d4, then:
- 1...d6 The d-pawn advances to d6, covering c5 and e5, opening a line for the bishop on c8 and the queen on d8.
Lines filed under A41
All 11 share the start 1.d4 and then split two ways at Black’s move 1.
| Name | After the shared start | Plies | At the end |
|---|---|---|---|
| Queen’s Pawn Game | 1...d6 | 2 | |
| Old Indian Defense | 1...d6 2.c4 | 3 | |
| Queen’s Pawn Game: Rossolimo Variation | 1...d6 2.Nf3 g6 | 4 | |
| Rat Defense: English Rat | 1...d6 2.c4 e5 | 4 | |
| Wade Defense | 1...d6 2.Nf3 Bg4 | 4 | |
| Modern Defense | 1...g6 2.c4 Bg7 3.Nc3 d6 | 6 | |
| Modern Defense: Neo-Modern Defense | 1...g6 2.c4 Bg7 3.e4 e5 | 6 | |
| Rat Defense: English Rat, Lisbon Gambit | 1...d6 2.c4 e5 3.dxe5 Nc6 | 6 | White +1 |
| Rat Defense: English Rat, Pounds Gambit | 1...d6 2.c4 e5 3.dxe5 Be6 | 6 | White +1 |
| Robatsch Defense: Rossolimo Variation | 1...d6 2.Nf3 g6 3.c4 Bg7 4.e4 Bg4 | 8 | |
| Zukertort Opening: Wade Defense, Chigorin Plan | 1...d6 2.Nf3 Bg4 3.c4 Nd7 4.Qb3 Rb8 | 8 |
The road to A41
- 1.d4A40 Queen’s Pawn Game
- 1...d6A41
The position after 1...d6
White is to move and has 28 legal moves.
Codes that branch off from A41
The reference lines of one other code leave A41 from the position after 3...d6, each with its own moves.
| Code | Moves | Reference line |
|---|---|---|
| A42 | 4.e4 | Modern Defense: Averbakh System |
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| D00 | Queen’s Pawn Game | two squares: d5, d6 |
| D20 | Queen’s Gambit Accepted | three squares: c2, c4, d6 |
| A43 | Benoni Defense: Old Benoni | four squares: c5, d6, c7, d7 |
| A45 | Indian Defense | four squares: d6, f6, d7, g8 |
| A53 | Old Indian Defense | four squares: c2, c4, f6, g8 |
| A80 | Dutch Defense | four squares: f5, d6, d7, f7 |
| B07 | King’s Pawn Game: Maróczy Defense | four squares: e2, e4, e5, e7 |