C43 Petrov’s Defense: Modern Attack
Also filed here: Bishop’s Opening.
C43 holds 12 named lines from two openings, most of them (ten) under Petrov’s Defense. It leaves C42 (Petrov’s Defense) with 3.d4. Material is no longer level at the end of eight of its lines; the widest gap, three pawns in Black’s favour, comes in Petrov’s Defense: Modern Attack, Trifunovic Variation. That final move, by the d-pawn, covers c5 and e5 and opens a line for the bishop on c1 and the queen on d1.
| # | White | Black |
|---|---|---|
| 1 | e4 | e5 |
| 2 | Nf3 | Nf6 |
| 3 | d4 |
Lines filed under C43
All 12 share the start 1.e4 e5 and then split two ways at White’s move 2.
| Name | After the shared start | Plies | At the end |
|---|---|---|---|
| Petrov’s Defense: Modern Attack | 2.Nf3 Nf6 3.d4 | 5 | |
| Petrov’s Defense: Modern Attack | 2.Nf3 Nf6 3.d4 exd4 | 6 | Black +1 |
| Petrov’s Defense: Modern Attack, Symmetrical Variation | 2.Nf3 Nf6 3.d4 d5 | 6 | |
| Bishop’s Opening: Urusov Gambit | 2.Bc4 Nf6 3.d4 exd4 4.Nf3 | 7 | Black +1 |
| Petrov’s Defense: Modern Attack, Center Variation | 2.Nf3 Nf6 3.d4 Nxe4 4.Bd3 | 7 | Black +1 |
| Petrov’s Defense: Modern Attack, Murrey Variation | 2.Nf3 Nf6 3.d4 Nxe4 4.Bd3 Nc6 | 8 | Black +1 |
| Bishop’s Opening: Urusov Gambit, Keidansky Gambit | 2.Bc4 Nf6 3.d4 exd4 4.Nf3 Nxe4 5.Qxd4 | 9 | Black +1 |
| Petrov’s Defense: Modern Attack, Center Attack | 2.Nf3 Nf6 3.d4 exd4 4.e5 Ne4 5.Qxd4 | 9 | |
| Petrov’s Defense: Modern Attack, Steinitz Variation | 2.Nf3 Nf6 3.d4 exd4 4.e5 Ne4 5.Qe2 | 9 | Black +1 |
| Petrov’s Defense: Modern Attack, Tal Gambit | 2.Nf3 Nf6 3.d4 exd4 4.e5 Ne4 5.Bb5 | 9 | Black +1 |
| Petrov’s Defense: Modern Attack, Bardeleben Variation | 2.Nf3 Nf6 3.d4 exd4 4.e5 Ne4 5.Qe2 Nc5 6.Nxd4 Nc6 | 12 | |
| Petrov’s Defense: Modern Attack, Trifunovic Variation | 2.Nf3 Nf6 3.d4 Nxe4 4.Bd3 d5 5.Nxe5 Bd6 6.O-O O-O 7.c4 Bxe5 | 14 | Black +3, both castled |
The road to C43
- 1.e4 … 1...e5two earlier stops: B00, C20
- 2.Nf3C40 King’s Knight Opening
- 2...Nf6C42 Petrov’s Defense
- 3.d4C43
The position after 3.d4
White has brought out the knight on f3; Black the knight on f6. Black could capture with Nxe4, exd4. Undefended and attacked: the pawn on e4. Black is to move and has 28 legal moves.
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| A46 | Indian Defense: Knights Variation | four squares: e2, e4, e5, e7 |
| C40 | King’s Knight Opening | four squares: d2, d4, f6, g8 |
| C56 | Italian Game: Two Knights Defense, Open Variation | four squares: f1, c4, c6, b8 |
| A05 | Zukertort Opening | six squares: d2, e2, d4, e4, e5, e7 |
| A45 | Indian Defense | six squares: g1, e2, f3, e4, e5, e7 |
| A47 | Pseudo Queen’s Indian Defense | six squares: e2, e4, e5, b6, b7, e7 |
| A48 | East Indian Defense | six squares: e2, e4, e5, g6, e7, g7 |