D20 Queen’s Gambit Accepted
D20 holds 17 named lines, all under the name Queen’s Gambit. It leaves D06 (Queen’s Gambit) with 2...dxc4. When the reference line ends, Black is one pawn up on material. With 17 named lines it is the second-largest code of the 44 Queen’s Gambit codes.
| # | White | Black |
|---|---|---|
| 1 | d4 | d5 |
| 2 | c4 | dxc4 |
The move that completes D20
The reference line of D21 plays all of these moves and continues beyond them; D20 is the position reached at 2...dxc4.
- 2...dxc4 The d-pawn takes the pawn on c4, covering b3 and d3, opening a line for the queen on d8.
Lines filed under D20
All 17 share their first four plies, the whole reference line and then split three ways at White’s move 3.
| Name | After the shared start | Plies | At the end |
|---|---|---|---|
| Queen’s Gambit Accepted | (the shared start itself) | 4 | Black +1 |
| Queen’s Gambit Accepted: Accelerated Mannheim Variation | 3.Qa4+ | 5 | Black +1, check |
| Queen’s Gambit Accepted: Old Variation | 3.e3 | 5 | Black +1 |
| Queen’s Gambit Accepted: Saduleto Variation | 3.e4 | 5 | Black +1 |
| Queen’s Gambit Accepted: Central Variation, Alekhine System | 3.e4 Nf6 | 6 | Black +1 |
| Queen’s Gambit Accepted: Central Variation, Greco Variation | 3.e4 b5 | 6 | Black +1 |
| Queen’s Gambit Accepted: Central Variation, McDonnell Defense | 3.e4 e5 | 6 | Black +1 |
| Queen’s Gambit Accepted: Central Variation, Modern Defense | 3.e4 Nc6 | 6 | Black +1 |
| Queen’s Gambit Accepted: Central Variation, Rubinstein Defense | 3.e4 c5 | 6 | Black +1 |
| Queen’s Gambit Accepted: Schwartz Defense | 3.e4 f5 | 6 | Black +1 |
| Queen’s Gambit Accepted: Central Variation, McDonnell Defense, Somov Gambit | 3.e4 e5 4.Bxc4 | 7 | |
| Queen’s Gambit Accepted: Central Variation, Rubinstein Defense, Yefimov Gambit | 3.e4 c5 4.d5 b5 | 8 | Black +1 |
| Queen’s Gambit Accepted: Linares Variation | 3.e4 c5 4.d5 Nf6 5.Nc3 b5 | 10 | Black +1 |
| Queen’s Gambit Accepted: Old Variation, Billinger Gambit | 3.e3 e5 4.Bxc4 exd4 5.Qb3 Qe7 6.a3 | 11 | Black +1 |
| Queen’s Gambit Accepted: Old Variation, Christensen Gambit | 3.e3 e5 4.Bxc4 exd4 5.Qb3 Qe7 6.Nf3 | 11 | Black +1 |
| Queen’s Gambit Accepted: Old Variation, Korchnoi Gambit | 3.e3 e5 4.Bxc4 exd4 5.Qb3 Qe7 6.Kf1 | 11 | Black +1 |
| Queen’s Gambit Accepted: Old Variation, Novikov Gambit | 3.e3 e5 4.Bxc4 exd4 5.Qb3 Qe7 6.Nd2 | 11 | Black +1 |
The road to D20
- 1.d4one earlier stop: A40
- 1...d5D00 Queen’s Pawn Game
- 2.c4D06 Queen’s Gambit
- 2...dxc4D20
The position after 2...dxc4
White has a half-open c-file; Black a half-open d-file. White is to move and has 29 legal moves.
Codes that branch off from D20
The reference lines of one other code leave D20 from the position after 2...dxc4, each with its own moves.
| Code | Moves | Reference line |
|---|---|---|
| D21 | 3.Nf3 | Queen’s Gambit Accepted: Normal Variation |
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| A40 | Queen’s Pawn Game | three squares: c2, c4, d7 |
| A41 | Queen’s Pawn Game | three squares: c2, c4, d6 |
| D00 | Queen’s Pawn Game | three squares: c2, c4, d5 |
| A10 | English Opening | four squares: d2, c4, d4, d7 |
| A50 | Indian Defense: Normal Variation | four squares: c4, f6, d7, g8 |
| A53 | Old Indian Defense | four squares: c4, d6, f6, g8 |
| A84 | Dutch Defense | four squares: c4, f5, d7, f7 |
Where lines continue from here
Forty-four named lines filed under other codes pass through the position after 2...dxc4. Besides the codes above, they belong to D22, D23, D24, D25, D26, D27, D28, D29.