Tree path 10 levels King's Pawn Game › King's Knight Opening › Petrov's Defense › Petrov's Defense › Petrov's Defense › Petrov's Defense › Petrov's Defense › Classical Attack › Mason-Showalter Variation › Petrov's Defense: Classical Attack, Jaenisch Variation
- Chess Codex
- King's Pawn Game C20
- King's Knight Opening C40
- Petrov's Defense C42
- Petrov's Defense C42
- Petrov's Defense C42
- Petrov's Defense C42
- Petrov's Defense C42
- Classical Attack C42
- Mason-Showalter Variation C42
- Petrov's Defense: Classical Attack, Jaenisch Variation C42 you are here
Petrov's Defense: Classical Attack, Jaenisch Variation
Overview
Petrov's Defense: Classical Attack, Jaenisch Variation is a named branch in the Open Games group of chess theory, classified under ECO C42.
The Open Games group covers open games — classical 1.e4 e5 openings where both sides contest the centre directly with pawns.
It is reached after 15 plies of play, with the move sequence 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6 7. O-O Be7 8. c4.
In the opening tree, this line branches off from Petrov's Defense: Classical Attack, Mason-Showalter Variation, part of the broader King's Pawn Game system.
2 named variations grow from this line, including Petrov's Defense: Classical Attack, Chigorin Variation, Browne Attack, Petrov's Defense: Classical Attack, Chigorin Variation, Main Line.
Use the board to walk through every move, check how the position has scored on Lichess, or take it head-to-head against Stockfish.
- ECO code
- C42
- Group
- Open Games (C)
- Plies
- 15
- Direct variations
- 2
This overview is generated automatically from the opening's metadata. Know this line well? Write a description — submissions are reviewed before publishing.
Statistics from Lichess
48,598 games · White 47.2% / Draw 9.3% / Black 43.6%
| Moves | Games | W / D / B |
|---|---|---|
| Nb4 | 33,792 | |
| Nf6 | 7,636 | |
| O-O | 2,947 | |
| Bg4 | 2,627 | |
| Bf5 | 871 | |
| Be6 | 569 | |
| f5 | 106 | |
| dxc4 | 13 |
Source: Lichess Opening Explorer · cached 2026-09-26 03:05:56
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