Tree path 9 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
- 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 you are here
Petrov's Defense: Classical Attack, Mason-Showalter Variation
Overview
Petrov's Defense: Classical Attack, Mason-Showalter Variation is a specific line in the Open Games family (ECO C42), arising from a recognised theoretical position.
The Open Games group covers open games — classical 1.e4 e5 openings where both sides contest the centre directly with pawns.
It begins with 12 plies and takes 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6 to reach the canonical position.
The line refines Petrov's Defense: Classical Attack, which traces back to the root opening King's Pawn Game.
The line splits into 2 documented sub-systems: Petrov's Defense: Classical Attack, Jaenisch Variation, Petrov's Defense: Classical Attack, Krause Variation.
Together the deeper variations number 4 across the full subtree.
Explore the position on the interactive board, study its real-world results from Lichess, and challenge the engine when you are ready.
- ECO code
- C42
- Group
- Open Games (C)
- Plies
- 12
- Direct variations
- 2
- Total in subtree
- 4
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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