Chess Openings → Petrov Defense

Petrov Defense: a symmetrical counter to 1.e4 e5

The Petrov Defense begins with 1.e4 e5 2.Nf3 Nf6 — instead of defending the e5 pawn with a knight to c6, Black immediately counterattacks the e4 pawn with the very same move White just played. It's one of the most symmetrical and best-studied openings, valued for its low entry barrier: little theory to memorize, but one move order you need to know exactly.

In short: after 3.Nxe5 the move order is what matters most — first 3...d6, chasing away the knight, and only then recapturing on e4. Playing 3...Nxe4?? right away loses a piece to 4.Qe2. White can also play more quietly with 3.Nc3, transposing to the Four Knights Game. You can practice the full repertoire — with branches for every reasonable reply from White — in the opening trainer, free and without an account.

Starting position and the idea

After 1.e4 e5 2.Nf3, the move 2...Nf6 threatens to capture on e4, exactly as White threatens to capture on e5 — hence the name: a symmetrical reply. White's most common reaction is 3.Nxe5, after which Black must remember one thing: first 3...d6, only then recapture with the knight on e4. After the correct move order (3...d6 4.Nf3 Nxe4), Black reaches a solid, symmetrical position with little risk — no need to memorize dozens of variations.

White's two most common replies

• 3.Nxe5 — White's most common and most testing try. After 3...d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Nc6 Black reaches the well-known, solid main position of the Petrov Defense. Next: Be7, short castling, and calm development of the remaining pieces — little theory, a clear plan.
• 3.Nc3 — White avoids capturing on e5 and develops instead, and the position transposes into the Four Knights Game. After 3...Nc6 4.Bb5 (or 4.Bc4) Bc5 the same symmetrical, well-known position arises: short castling and calm development of the remaining pieces.

Honestly, about this page's scope

The above is a sketch of the plan, not a full trainer with every branch and typical opponent mistakes. The full Petrov Defense repertoire — including the exact move order after 3.Nxe5 and an evaluation of every line verified by the Stockfish engine — is waiting in the opening trainer inside the app. Before playing your first opening, it's also worth knowing the 5 rules that win most games — the Petrov Defense is just one way of putting those rules into practice.

More openings (including the Italian Game, the Sicilian Defense, and the Queen's Gambit) are covered on the Chess Openings page. Want to practice these same principles right away against an opponent? Play a game against the computer at any difficulty level.

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