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 Variation
Petrov's Defense: Classical Attack, Mason Variation
Overview
Petrov's Defense: Classical Attack, Mason 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.
Play reaches this position via 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O O-O, after 14 plies of opening development.
In the opening tree, this line branches off from Petrov's Defense: Classical Attack, part of the broader King's Pawn Game system.
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
- 14
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
103,108 games · White 51.7% / Draw 7.3% / Black 41.0%
| Moves | Games | W / D / B |
|---|---|---|
| c4 | 42,539 | |
| Re1 | 39,897 | |
| Nbd2 | 6,088 | |
| h3 | 5,964 | |
| Nc3 | 2,943 | |
| c3 | 2,101 | |
| Bf4 | 1,759 | |
| Ne5 | 680 |
Source: Lichess Opening Explorer · cached 2026-09-26 02:57:34
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