Petrov's Defense

Petrov's Defense begins 1.e4 e5 2.Nf3 Nf6. White attacks Black's e5-pawn, and Black answers by attacking White's e4-pawn. Rather than defend passively, Black creates a counterattack, an immediate threat against an equivalent central target.

The Petrov answers an attack with another attack

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StartNf6Nxe5d6Nf3Nxe4

The knight on f3 attacks e5 and creates the position's first central problem.

White already pressures e5

After 2.Nf3, Black must decide whether to protect the attacked pawn or create an equivalent threat.

1. The knight on f3 attacks e5 and creates the position's first central problem.

The position looks symmetrical, but copying moves blindly is dangerous. After 3.Nxe5, the main response is 3...d6, which makes the white knight decide where to retreat, and only then does Black usually recapture on e4. The immediate 3...Nxe4 preserves visual symmetry but allows favorable tactics for White.

Immediate symmetry demands precise defense

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StartNxe4Qe2Qe7

After 3.Nxe5, move order matters

Black can play 3...d6 first. Capturing immediately on e4 preserves the symmetrical shape but gives White an active response.

Many lines exchange central pawns and produce a balanced pawn structure, meaning the pawns are arranged without an obvious one-sided weakness. This explains the Petrov's solid reputation. Solid does not mean an automatic draw: both players still choose how to develop, use open files, and break the symmetry.

With 3.Nc3, White develops the other knight. If Black replies ...Nc6, the game transposes into the Four Knights Game. The Petrov also sidesteps many branches of the Ruy Lopez because Black has not played 2...Nc6.