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Petrov's Defense: Classical Attack, Mason Variation

ECO C42 · 124 games · White to move

1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O O-O

53% White3% Draw44% Black

Open this position on the board

What gets played next

Move	Games	Share	White / draw / Black	Leads to
c4	52	41.9%
Re1	39	31.5%

A further 33 games played a rarer move, or ended right here.

How this line is reached

King's Pawn Game 1. e4 King's Pawn Game 1... e5 King's Knight Opening 2. Nf3 Petrov's Defense 2... Nf6 Petrov's Defense 3. Nxe5 Petrov's Defense 3... d6 Petrov's Defense 4. Nf3 Petrov's Defense 4... Nxe4 Petrov's Defense: Classical Attack 5. d4Petrov's Defense: Classical Attack, Mason Variation 7... O-O

Other lines in this family

Classical Attack, Marshall VariationC42… 6... Bd6684 Classical Attack, Staunton VariationC42… 6... Bd6 7. O-O O-O 8. c4 c6351 Classical Attack, Mason-Showalter VariationC42… 6... Nc6259 Classical Attack, Jaenisch VariationC42… 6... Nc6 7. O-O Be7 8. c488 Classical AttackC42…2,112 Petrov's DefenseC42…5,273 Cozio AttackC42… 5. Qe21,053 Nimzowitsch AttackC42… 5. Nc31,013 French AttackC42… 5. d3576 Millennium AttackC42… 5. Bd3134

All 33 lines in the family

Data: 4 million rated games from the Lichess open database (CC0), both players 1600+, blitz and slower. Popular is not the same as good.