C21 Center Game Accepted
Also filed here: Danish Gambit.
C21 holds 19 named lines from two openings, most of them (11) under Center Game. It leaves C20 (Center Game) with 2...exd4. When the reference line ends, Black is one pawn up on material. That final move, by the e-pawn, covers c3 and e3.
| # | White | Black |
|---|---|---|
| 1 | e4 | e5 |
| 2 | d4 | exd4 |
Lines filed under C21
All 19 share their first four plies, the whole reference line and then split six ways at White’s move 3.
| Name | After the shared start | Plies | At the end |
|---|---|---|---|
| Center Game Accepted | (the shared start itself) | 4 | Black +1 |
| Center Game | 3.Qxd4 | 5 | |
| Center Game: Halasz-McDonnell Gambit | 3.f4 | 5 | Black +1 |
| Center Game: Kieseritzky Variation | 3.Nf3 | 5 | Black +1 |
| Center Game: Ross Gambit | 3.Bd3 | 5 | Black +1 |
| Center Game: von der Lasa Gambit | 3.Bc4 | 5 | Black +1 |
| Danish Gambit | 3.c3 | 5 | Black +1 |
| Center Game: Kieseritzky Variation | 3.Nf3 c5 | 6 | Black +1 |
| Danish Gambit Accepted | 3.c3 dxc3 | 6 | Black +2 |
| Danish Gambit Accepted: Svenonius Defense | 3.c3 Ne7 | 6 | Black +1 |
| Danish Gambit Declined: Sörensen Defense | 3.c3 d5 | 6 | Black +1 |
| Center Game: Kieseritzky Variation | 3.Nf3 c5 4.Bc4 | 7 | Black +1 |
| Center Game: Lanc-Arnold Gambit | 3.Nf3 Bc5 4.c3 | 7 | Black +1 |
| Center Game: Halasz-McDonnell Gambit, Crocodile Variation | 3.f4 Bc5 4.Nf3 Nc6 5.c3 | 9 | Black +1 |
| Center Game: Lanc-Arnold Gambit, Schippler Gambit | 3.Nf3 Bc5 4.c3 dxc3 5.Bc4 | 9 | Black +2 |
| Danish Gambit Accepted: Chigorin Defense | 3.c3 dxc3 4.Bc4 cxb2 5.Bxb2 Qe7 | 10 | Black +2 |
| Danish Gambit Accepted: Classical Defense | 3.c3 dxc3 4.Bc4 cxb2 5.Bxb2 Nf6 | 10 | Black +2 |
| Danish Gambit Accepted: Copenhagen Defense | 3.c3 dxc3 4.Bc4 cxb2 5.Bxb2 Bb4+ | 10 | Black +2, check |
| Danish Gambit Accepted: Schlechter Defense | 3.c3 dxc3 4.Bc4 cxb2 5.Bxb2 d5 | 10 | Black +2 |
The road to C21
- 1.e4one earlier stop: B00
- 1...e5C20 King’s Pawn Game
- 2.d4C20 Center Game
- 2...exd4C21
The position after 2...exd4
White has a half-open d-file; Black a half-open e-file. White could capture with Qxd4. Undefended and attacked: the pawn on d4. White is to move and has 38 legal moves.
Codes that branch off from C21
The reference lines of one other code leave C21 from the position after 3.Qxd4, each with its own moves.
| Code | Moves | Reference line |
|---|---|---|
| C22 | 3...Nc6 | Center Game: Normal Variation |
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| B00 | King’s Pawn Game | three squares: d2, d4, e7 |
| C00 | French Defense | three squares: d2, d4, e6 |
| A40 | Queen’s Pawn Game | four squares: e2, d4, e4, e7 |
| A82 | Dutch Defense: Staunton Gambit | four squares: d4, f5, e7, f7 |
| B07 | King’s Pawn Game: Maróczy Defense | four squares: d4, e5, d6, d7 |
| B12 | Caro-Kann Defense | four squares: d4, c6, c7, e7 |
| C33 | King’s Gambit Accepted | four squares: d2, f2, d4, f4 |
Where lines continue from here
Seven named lines filed under other codes pass through the position after 2...exd4. All of them belong to the codes listed above.