Petrov's Defense: Modern Attack

An entry in the Encyclopedia of Chess Openings (ECO C43), reached after 5 half-moves: 1. e4 e5 2. Nf3 Nf6 3. d4.

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About this opening

Petrov's Defense: Modern Attack is an opening in the Encyclopedia of Chess Openings, classified under code C43. ECO group C (C00–C99) covers open games (1.e4 e5) and the French Defence, including the Ruy Lopez, Italian, Scotch and King's Gambit. This particular variation is reached after 5 half-moves from the starting position, with the move sequence 1. e4 e5 2. Nf3 Nf6 3. d4.

It belongs to the Petrov's Defense family. Within that family this is a sub-variation (the Modern Attack line).

The opening sequence in prose form: 1.e4 e5, 2.Nf3 Nf6, 3.d4. From this position 3 named continuations are recorded in the encyclopaedia, each leading to a distinct theoretical line.