Petrov's Defense: Classical Attack, Krause Variation

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

ECO C42

The Petrov's Defense: Classical Attack, Krause Variation is a chess opening line in the Petrov's Defense complex, reached after 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Nc6 7.O-O Be7 8.Re1 Bg4 9.c3 f5 10.c4.

It is catalogued under code C42 in the Encyclopaedia of Chess Openings (ECO).

The defining move c4 is chosen by White on move 10.

Study this line with a grandmaster

This position is covered in the Petroff Defense course: a GM-authored repertoire you study move by move, then practice against a human-like AI opponent.

Every chess term used here is defined in the chess terms glossary. Browse all opening courses or the full ECO code index.