Tree path 8 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
- 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 you are here
Petrov's Defense: Classical Attack
Overview
Petrov's Defense: Classical Attack 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.
Play reaches this position via 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4, after 9 plies of opening development.
In the opening tree, this line branches off from Petrov's Defense, part of the broader King's Pawn Game system.
5 named variations grow from this line, including Chigorin Variation, Closed Variation, Marshall Variation, and others.
In total, the branch covers 15 sub-variations across all depths.
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
- 9
- Parent
- Petrov's Defense
- Direct variations
- 5
- Total in subtree
- 15
This overview is generated automatically from the opening's metadata. A more detailed, human-written description is on the way — and you can speed it up by suggesting one yourself.
Statistics from Lichess
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Source: Lichess Opening Explorer · cached
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Variations (5)
Show all 15 sub-variations (full subtree)
- C42 Chigorin Variation 15-ply
- C42 Closed Variation 10-ply
- C42 Marshall Variation 12-ply
- C42 Mason Variation 14-ply
- C42 Mason-Showalter Variation 12-ply
- C42 Petrov's Defense: Classical Attack, Berger Variation 19-ply
- C42 Petrov's Defense: Classical Attack, Jaenisch Variation 15-ply
- C42 Petrov's Defense: Classical Attack, Krause Variation 19-ply
- C42 Petrov's Defense: Classical Attack, Maróczy Variation 20-ply
- C42 Petrov's Defense: Classical Attack, Staunton Variation 16-ply
- C42 Petrov's Defense: Classical Attack, Tarrasch Variation 16-ply
- C42 Petrov's Defense: Classical Attack, Chigorin Variation, Browne Attack 17-ply
- C42 Petrov's Defense: Classical Attack, Chigorin Variation, Main Line 17-ply
- C42 Petrov's Defense: Classical Attack, Marshall Trap 20-ply
- C42 Petrov's Defense: Classical Attack, Marshall Variation, Chinese Gambit 18-ply