D23 Queen’s Gambit Accepted
D23 holds four named lines, all under the name Queen’s Gambit. It leaves D21 (Queen’s Gambit Accepted: Normal Variation) with 3...Nf6. When the reference line ends, Black is one pawn up on material. That final move, by the knight, opens a line for the rook on h8.
| # | White | Black |
|---|---|---|
| 1 | d4 | d5 |
| 2 | c4 | dxc4 |
| 3 | Nf3 | Nf6 |
Lines filed under D23
All four share their first six plies, the whole reference line.
| Name | After the shared start | Plies | At the end |
|---|---|---|---|
| Queen’s Gambit Accepted | (the shared start itself) | 6 | Black +1 |
| Queen’s Gambit Accepted: Mannheim Variation | 4.Qa4+ | 7 | Black +1, check |
| Queen’s Gambit Accepted: Mannheim Variation | 4.Qa4+ c6 5.Qxc4 | 9 | |
| Queen’s Gambit Accepted: Mannheim Variation | 4.Qa4+ c6 5.Qxc4 e6 6.Qc2 | 11 |
Queen’s Gambit Accepted: Mannheim Variation
- 4.Qa4+ The queen goes from d1 to a4, giving check.
Queen’s Gambit Accepted: Mannheim Variation
- 4.Qa4+ The queen goes from d1 to a4, giving check.
- 4...c6 The c-pawn advances to c6, covering b5 and d5, opening a line for the queen on d8.
- 5.Qxc4 The queen on a4 takes the pawn on c4, guarding the bishop on c1.
Queen’s Gambit Accepted: Mannheim Variation
- 4.Qa4+ The queen goes from d1 to a4, giving check.
- 4...c6 The c-pawn advances to c6, covering b5 and d5, opening a line for the queen on d8.
- 5.Qxc4 The queen on a4 takes the pawn on c4, guarding the bishop on c1.
- 5...e6 The e-pawn advances to e6, covering d5 and f5, opening a line for the queen on d8 and the bishop on f8.
- 6.Qc2 The queen goes from c4 to c2.
The road to D23
- 1.d4 … 2.c4three earlier stops: A40, D00, D06
- 2...dxc4D20 Queen’s Gambit Accepted
- 3.Nf3D21 Normal Variation
- 3...Nf6D23
The position after 3...Nf6
White has brought out the knight on f3; Black the knight on f6. White has a half-open c-file; Black a half-open d-file. White is to move and has 31 legal moves.
Codes that branch off from D23
The reference lines of two other codes leave D23 from the position after 3...Nf6, each with its own moves.
| Code | Moves | Reference line |
|---|---|---|
| D24 | 4.Nc3 | Queen’s Gambit Accepted: Showalter Variation |
| D25 | 4.e3 | Queen’s Gambit Accepted: Normal Variation |
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| A46 | Indian Defense: Knights Variation | three squares: c2, c4, d7 |
| D13 | Slav Defense: Exchange Variation | three squares: c4, d5, c7 |
| A31 | English Opening: Symmetrical Variation, Anti-Benoni Variation | four squares: c4, c5, c7, d7 |
| A50 | Indian Defense: Normal Variation | four squares: g1, f3, c4, d7 |
| A53 | Old Indian Defense | four squares: g1, f3, c4, d6 |
| A54 | Old Indian Defense: Tartakower-Indian | four squares: c4, g4, d6, c8 |
| D20 | Queen’s Gambit Accepted | four squares: g1, f3, f6, g8 |
Where lines continue from here
Twenty-nine named lines filed under other codes pass through the position after 3...Nf6. Besides the codes above, they belong to D26, D27, D28, D29.