C42 · Petrov's Defense

Petrov's Defense: Classical Attack, Krause Variation

1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O Nc6 8. Re1 Bg4 9. c3 f5 10. c4

The position after 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O Nc6 8. Re1 Bg4 9. c3 f5 10. c4, Black to move.

In the Petrov's Defense: Classical Attack, Krause Variation, aim to understand the plans and pawn structures, not just memorize the first moves.

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The Petrov's Defense: Classical Attack, Krause Variation is a chess opening classified under ECO code C42. It is reached after the moves 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Be7 7. O-O Nc6 8. Re1 Bg4 9. c3 f5 10. c4: 19 moves in, with Black to play.

It belongs to the Petrov's Defense family — one of many ways the line can branch. Understanding the parent system’s plans is the fastest way to play this variation well.

Club players rarely lose the Petrov's Defense: Classical Attack, Krause Variation in the opening itself. They lose it a few moves later, when the plan behind the moves runs out: that is what reading your own games in this line shows you.

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Related openings

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